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projects/ngx-list-view/src/lib/components/clear-filters/ngx-clear-filters.component.ts
|
component
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NgxClearFiltersComponent
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0 %
(0/4)
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projects/ngx-list-view/src/lib/components/counter/ngx-counter.component.ts
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component
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NgxCounterComponent
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0 %
(0/6)
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projects/ngx-list-view/src/lib/components/date-filter/ngx-date-filter.component.ts
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component
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NgxDateFilterComponent
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0 %
(0/6)
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projects/ngx-list-view/src/lib/components/list-filter/ngx-list-filter.component.ts
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component
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NgxListFilterComponent
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5 %
(1/19)
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projects/ngx-list-view/src/lib/components/list-preview/ngx-list-preview.component.ts
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component
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NgxListPreviewComponent
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25 %
(2/8)
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projects/ngx-list-view/src/lib/components/list-view/ngx-list-view.component.ts
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component
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NgxListViewComponent
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40 %
(24/60)
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projects/ngx-list-view/src/lib/components/no-results/ngx-no-results.component.ts
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projects/ngx-list-view/src/lib/components/not-found/ngx-not-found.component.ts
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projects/ngx-list-view/src/lib/components/pagination/ngx-pagination.component.ts
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projects/ngx-list-view/src/lib/components/search/ngx-search.component.ts
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projects/ngx-list-view/src/lib/directives/ngx-icheck.directive.ts
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directive
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NgxIcheckDirective
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13 %
(2/15)
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projects/ngx-list-view/src/lib/directives/ngx-list-form-reset.directive.ts
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directive
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All groups for the project must be ready by next Monday (11 December) - I've just received one email so far
It's a bit of time I don't see any active interaction in the mailing list. What's it happening?
It is an artificial intelligence developed by Google DeepMind for playing to Go
Before 2015: several software have been developed to play to Go automatically, but all of them showed their limits when tested with human expert players of the game - in fact, no Go software was able to beat a human master
In 2015: Google declared to have developed the best artificial intelligence for playing to Go, and asked to test it in international matches against the strongest Go players
Match in October 2015, best of five games
Fan Hui was the champion of the European Go Championship in 2013, 2014 and 2015 (professional 2 dan player)
Result: 5 - 0
Match in March 2016, best of five games
In 2016, Lee Sedol was ranked second in international titles (professional 9 dan player, max rank)
Result: 4 - 1
Match in May 2017, best of three games
In 2017, Ke Jie was ranked number one in the world (professional 9 dan player, max rank)
Result: 3 - 0
Match in October 2017, best of one hundred games
AlphaGo Zero has been trained without using any existing human knowledge – i.e. the matches between human champions that have been archived in the past, that have been actually used for training AlphaGo
Result: 100 - 0
Algorithms for finding a solution to abstract strategy board games are based on a tree (node = possible move)
Backtracking algorithms find a solution by identifying possible candidates incrementally, and abandons partial candidates if they won't provide a solution
[leaf-win] if current node is a leaf and it is a solution then return it, otherwise
[leaf-lose] if current node is a leaf but it is not a solution, then return no solution back the parent node, otherwise
[recursive-step] apply recursively the whole approach for each child of the current node, until one of these recursive executions returns a solution - if no solution, back the parent node of the current one
It is a board game for one person only which involves the movement of some pegs on board containing holes
Starting situation: the entire board is filled up with pegs except the central position which is empty
Goal: whole board is full of holes except the central position which must contain a peg
Valid move: moving orthogonally a pag over an adjacent peg into a hole two position away, removing the jumped peg from the board
Computational problem: find a sequence of moves that allows one to solve the peg solitaire
[leaf-win] if last move brought to only one peg in the board in central position, then a solution has been found and return it, otherwise
[leaf-lose] if last move brought to a situation where no additional moves are possible, then recreate previous status of the board and return no solutions, otherwise
[recursive-step] apply recursively the algorithm for each possible valid move executable according to the current status of the board, until one of these recursive executions of the algorithm returns a solution – if none of them provide a solution, recreate the previous status of the board and return no solutions
(2,0) (3,0) (4,0) (2,1) (3,1) (4,1) (0,2) (1,2) (2,2) (3,2) (4,2) (5,2) (6,2) (0,3) (1,3) (2,3) (3,3) (4,3) (5,3) (6,3) (0,4) (1,4) (2,4) (3,4) (4,4) (5,4) (6,4) (2,5) (3,5) (4,5) (2,6) (3,6) (4,6)
Two sets of tuples:
pegs
: the list of the positions occupied by pegs - starting situation: all position but (3,3)
holes
: the list of the positions with no pegs - starting situation: only (3,3)
def valid_moves(pegs, holes)
: it returns a list of tree nodes, where each node represent a possible move that one can execute according to the current status of the board (defined by the two input sets pegs
and holes
def apply_move(node, pegs, holes)
: execute the move defined by the input node, and change the status of the board accordingly
def undo_move(node, pegs, holes)
: undo the move defined by the input node, and change the status of the board accordingly
def solve(pegs, holes, last_move=Node("start")):
result = None
if len(pegs) == 1 and (3, 3) in pegs:
result = last_move
else:
last_move.children = valid_moves(pegs, holes)
possible_moves = deque(last_move.children)
while result == None and len(possible_moves) > 0:
current_move = possible_moves.pop()
apply_move(current_move, pegs, holes)
result = solve(pegs, holes, current_move)
if result == None:
undo_move(current_move, pegs, holes)
return result
First execution:solve(initial_pegs, initial_holes)
If you have an infrastructure similar to the one used by Google DeepMind for developing AlphaGo, than I encourage you to run the algorithm shown in the previous slide
If that is not the case, don't try to run it in any computer since I really do not know how many years and memory space can take for finding a solution to the problem


Custom Operation using WASM + Brython
Multiply first number by 2 and add result to second number
Execute


Stampede Crossing by Rosalyn Guerrero
Your score:
Select Character
Cat Girl
Horn Girl
Pink Girl
Princess Girl
Boy


A utility to compile browserslist query to a RegExp to test browser useragent. Simplest example: you can detect supported browsers on client-side.
1) Create .browserslistrc
config, for example like this:
last 2 versions
not dead
2) Add script to package.json
:
{
"scripts": {
"supportedBrowsers": "echo \"module.exports = $(browserslist-useragent-regexp --allowHigherVersions);\" > supportedBrowsers.js"
}
}
{
"scripts": {
"supportedBrowsers": "(echo module.exports = && browserslist-useragent-regexp --allowHigherVersions) > supportedBrowsers.js"
}
}
3) Run this script, to compile RegExp:
npm run supportedBrowsers
# or
yarn supportedBrowsers
supportedBrowsers.js
:
module.exports = /((CPU[ +]OS|iPhone[ +]OS|CPU[ +]iPhone|CPU IPhone OS)[ +]+(11[_\.](3|4)|12[_\.](0|1))(?:[_\.]\d+)?)|(OperaMini(?:\/att)?\/?(\d+)?(?:\.\d+)?(?:\.\d+)?)|(Opera\/.+Opera Mobi.+Version\/46\.0)|(Opera\/46\.0.+Opera Mobi)|(Opera Mobi.+Opera(?:\/|\s+)46\.0)|(SamsungBrowser\/(8|9)\.2)|(Edge\/(17|18)(?:\.0)?)|(HeadlessChrome(?:\/(72|73)\.0\.\d+)?)|((Chromium|Chrome)\/(72|73)\.0(?:\.\d+)?)|(IEMobile[ \/]11\.0)|(Version\/12\.(0|1)(?:\.\d+)?.*Safari\/)|(Trident\/7\.0)|(Firefox\/(65|66)\.0\.\d+)|(Firefox\/(65|66)\.0(pre|[ab]\d+[a-z]*)?)|(([MS]?IE) 11\.0)/;
4) Import RegExp from created file:
const supportedBrowsers = require('./supportedBrowsers');
if (supportedBrowsers.test(navigator.userAgent)) {
alert('Your browser is supported.');
}
npm i -D browserslist-useragent-regexp
# or
yarn add -D browserslist-useragent-regexp
As was written in article "Smart Bundling: Shipping legacy code to only legacy browsers": you can determinate, which bundle you should give to browser from server with browserslist-useragent
. But in this case you must have your own server with special logic. Now, with browserslist-useragent-regexp
, you can move that to client-side.
Development was inspired by this proposal from Mathias Bynens.
Demo (sources, build script).
npx browserslist-useragent-regexp [query] [...options]
# or
yarn exec -- browserslist-useragent-regexp [query] [...options]
| Option | Description | Default |
|---|---|---|
| query | Manually provide a browserslist query. Specifying this overrides the browserslist configuration specified in your project. | |
| ‑‑help, -h | Print this message. | |
| ‑‑verbose, -v | Print additional info about RegExps. | |
| ‑‑ignorePatch | Ignore differences in patch browser numbers. | true |
| ‑‑ignoreMinor | Ignore differences in minor browser versions. | false |
| ‑‑allowHigherVersions | For all the browsers in the browserslist query, return a match if the useragent version is equal to or higher than the one specified in browserslist. | false |
| ‑‑allowZeroSubversions | Ignore match of patch or patch and minor, if they are 0. | false |
Module exposes two main methods:
Compile browserslist query to RegExps for each browser.
Compile browserslist query to one RegExp.
| Option | Type | Default | Description |
|---|---|---|---|
| browsers | string | string[] |
— | Manually provide a browserslist query (or an array of queries). Specifying this overrides the browserslist configuration specified in your project. |
| env | string |
— | When multiple browserslist environments are specified, pick the config belonging to this environment. |
| ignorePatch | boolean |
true |
Ignore differences in patch browser numbers. |
| ignoreMinor | boolean |
false |
Ignore differences in minor browser versions. |
| allowHigherVersions | boolean |
false |
For all the browsers in the browserslist query, return a match if the useragent version is equal to or higher than the one specified in browserslist. |
| allowZeroSubversions | boolean |
false |
Ignore match of patch or patch and minor, if they are 0. |
| Property | Type | Description |
|---|---|---|
| family | string |
Browser family. |
| requestVersions | [number, number, number][] |
Versions provided by browserslist. |
| regExp | RegExp |
RegExp to match useragent with family and versions. |
| sourceRegExp | RegExp |
Original useragent RegExp, without versions. |
| resultFixedVersion | [number, number, number] | null |
Useragent version of RegExp. |
| resultMinVersion | [number, number, number] | null |
Useragent min version of RegExp. |
| resultMaxVersion | [number, number, number] | null |
Useragent max version of RegExp. |
Generated using TypeDoc


Colombia Protests
by Associated Press1 / 7Anti-government protesters rally at the Bolivar square in Bogota, Colombia, Friday, Nov. 22, 2019. Colombian President Iván Duque ordered a curfew in the nation's capital amid continuing unrest one day after tens of thousands of people took to the streets in demonstrations during a nationwide strike. (AP Photo/Ivan Valencia)
BOGOTA, Colombia (AP) — The Latest on protests in Colombia (all times local):
7:10 p.m.
Colombian President Iván Duque says his government will open a “national conversation” aimed at reaching an agreement on reforms following massive demonstrations that have paralyzed much of the capital city.
In a televised address Friday, Duque said the dialogue will include all social sectors and take place in cities around the country starting next week.
The president also announced that he is boosting police and military patrols in focal points where there is continuing unrest.
Protesters clashed with police in several parts of Bogota on Friday, a day after tens of thousands of frustrated citizens took to the streets.
___
6:23 p.m.
Colombian President Iván Duque has ordered a curfew in the nation’s capital amid continuing unrest following a massive march.
The president announced on Twitter that he has requested that Bogota’s mayor enforce a curfew beginning at 9 p.m. in all of the city.
The curfew comes one day after an estimated 250,000 people took to the streets in one of the nation’s biggest marches in recent history.
There have been scattered clashes between protesters and police on Friday.
___
4 p.m.
Volunteers wiped graffiti off historic buildings and swept up shattered glass at looted businesses in Colombia Friday amid sporadic unrest following massive national protests a day before.
Labor unions and student leaders called on Colombians to bang pots and pans Friday evening in another act of protest while authorities announced three people had died in overnight clashes with police.
Protest organizers urged President Iván Duque to establish a dialogue with indigenous, student and labor groups to discuss potential reforms and criticized him for not directly addressing demonstrator complaints in a late-night address.
“If they don’t decide to govern in favor of the majority, the discontent will continue accumulating,” student leader José Cárdenas said.
Officials estimated 250,000 protesters marched in protests around Colombia, largely peaceful demonstrations that ended with scattered confrontations between police and protesters who vandalized bus stations and looted businesses.
The upheaval comes as Latin America is experiencing a tide of discontent, with massive demonstrations in countries including Chile, Bolivia and Ecuador where citizens frustrated with their political leaders are taking to the streets.


-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Winter is way better than Summer because you get to stay cozy inside, drink hot chocolate, go skiing and snowboarding, and the snow is very beautiful. The Summer is to hot and humid for me to enjoy.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Summer is a lot better than Winter because you get to spend more time outside in the sun, you can go to places like the beach and camping, and there is way more things to do in the Summer than there is in the winter.


Houston Rockets fan accused of punching New Orleans Pelicans coach banned from NBA events: report
by Ryan GaydosAn NBA fan accused of punching a New Orleans Pelicans coach in the face late last month reportedly has been banned from all NBA, WNBA and G-League games, as well as 2K League events.
Manuel Garcia, 38, was arrested last week after he allegedly punched Pelicans assistant coach Joe Boylan in the face after the Pelicans wrapped up a win against the Houston Rockets. Garcia, a Rockets fan, appeared to strike Boylan from the sideline.
KYRIE IRVING DISMISSES REPORT OF EPISODE ON PLANE: 'IT'S OK TO BE HUMAN'
The Athletic reported Sunday that Garcia has been banned from all NBA-related events.
Garcia was charged with misdemeanor assault and was out on bail working to secure a lawyer, according to ABC13 Houston. Even before the leaguewide ban, he was forbidden from attending Rockets games.
Garcia's motive for allegedly punching Boylan was not immediately clear.
“The Rockets won the game. Then one of the assistant coaches for the New Orleans Pelicans was gathering his things and was essentially cold-cocked or blindsided and struck in the face, brutally in my view,” Harris County District Attorney’s Office prosecutor Nathan Beedle said.
Garcia was on probation for an unrelated crime at the time of the punch, Beedle said.
“Clearly, we are going to take this extremely seriously,” Beedle said. “He is a convicted felon on probation right now charged with a Class A assault of a defenseless person in the case.”
CLICK HERE FOR MORE SPORTS COVERAGE ON FOXNEWS.COM
Brittney Aplin, 33, was also arrested for allegedly preventing police from detaining Garcia.
The Associated Press contributed to this report.


--- tags: - DP-状压 grammar_cjkRuby: true catalog: true layout: post header-img: "img/header/P9.jpg" preview-img: "/img/preview/P49.jpg" ---
标签：状压DP
Description
Alas! A set of D (1 <= D <= 15)diseases (numbered 1..D) is running through the farm. Farmer John would like tomilk as many of his N (1 <= N <= 1,000) cows as possible. If the milkedcows carry more than K (1 <= K <= D) different diseases among them, thenthe milk will be too contaminated and will have to be discarded in its entirety.Please help determine the largest number of cows FJ can milk without having todiscard the milk.
Input
* Line 1: Three space-separated integers:N, D, and K * Lines 2..N+1: Line i+1 describes the diseases of cow i with alist of 1 or more space-separated integers. The first integer, d_i, is thecount of cow i's diseases; the next d_i integers enumerate the actual diseases.Of course, the list is empty if d_i is 0. 有N头牛,它们可能患有D种病,现在从这些牛中选出若干头来,但选出来的牛患病的集合中不过超过K种病.
Output
* Line 1: M, the maximum number of cows whichcan be milked.
Sample Input
6 3 2
0---------第一头牛患0种病
1 1------第二头牛患一种病,为第一种病.
1 2
1 3
2 2 1
2 2 1
Sample Output
5
OUTPUT DETAILS:
If FJ milks cows 1, 2, 3, 5, and 6, thenthe milk will have only two
diseases (#1 and #2), which is no greaterthan K (2).
无脑状压，以d种病作为状态，最后寻找小于K的最优ans值即可
Code
#include<iostream> #include<iomanip> #include<cstring> #include<cstdio> #include<cstdlib> #include<algorithm> #define rep(i,a,b) for(int i=a;i<=b;i++) #define dep(i,a,b) for(int i=a;i>=b;i--) #define LL long long #define mem(x,num) memset(x,num,sizeof x) using namespace std; inline LL read() { LL f=1,x=0;char ch=getchar(); while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();} while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();} return x*f; } const int maxn=20; LL bin[20],a[1006],f[1<<maxn]; LL n,d,k,ed,ans; inline bool jud(int x) { int tot=0; rep(i,1,d) if(bin[i-1]&x){ tot++; if(tot>k)return 0; } return 1; } int main() { bin[0]=1; rep(i,1,maxn)bin[i]=bin[i-1]<<1; n=read(),d=read(),k=read();ed=(1<<d)-1; rep(i,1,n){ LL x=read(); rep(j,1,x){LL y=read();a[i]+=bin[y-1];} }//a[i]记录状态 rep(i,1,n) dep(j,ed,0) f[j|a[i]]=max(f[j|a[i]],f[j]+1);//注意倒序转移 rep(i,0,ed)if(jud(i))ans=max(ans,f[i]);//在d种病的状态中更新最佳答案 printf("%lld\n",ans); return 0; }


Better Late Than Never
4 years ago as an IT support intern at a small pharmaceutical company I decided that I was going to learn how to code. I sat down and made a spreadsheet of the most popular programming languages and the best online free courses for each one. Every day I would sit down at my computer with a fresh cup of coffee and pluck away at a few more exercises and try to learn just a little bit more.
4 years and as many half-completed courses later, I still didn’t know how to code. No longer a bright-eyed, pimply-faced-youth at a small company I’ve been transplated into a fast-paced startup surrounded by some of the brightest people I’ve ever met. Each of them has more programming talent in their little toes than I have in my whole body and its sparked in me a renewed comittment to learning to code.
This time I around I decided that I was willing to invest whatever it takes in learning a new skill and that has meant making learning to code a high priority in my life. Its also meant being honest with myself and my learning style. With that in mind I sought out a course with a strong teacher to help steer me and help make up for any shortcomings in my own discipline.
After a lengthy search I settled on Bloc’s frontend web development apprenticeship.
I was impressed with the amount of time set aside for 1-on-1 interaction with your mentor, something I feel is pivotal to my ability to learn, and their rigorous curriculum that reflected the real life tools a developer needs to function. I’ve been working on this course for almost two weeks and already I feel like I’ve learned more than I had in my self-study.
So far I’m squashed the basics of JavaScript, learned to conquer Git and even deployed a small site to Heroku. While I’ve often felt frustrated with some of the exercises its taught me to seek out answers aggressively and to put together solutions with all the tools available to me. I’ve still got 16 weeks ahead of me and a lot to learn but I hope to keep this blog updated with my progress and, hopefully, projects!


Routes
Search
Made by Lucas Ivan Seidenfus
Route Details
Stops
Departures
Weekday
Saturday
Sunday
Made by Lucas Ivan Seidenfus


Vietnamese community gathers for vigil to honour container lorry victims
Members of the Vietnamese community have gathered in London for a vigil in memory of the 39 people found in a lorry in Essex.
A vigil this evening was attended by more than one hundred people at the Church of the Holy Name and Our Lady of the Sacred Heart in east London.
Candles spelling out “39” were at the foot of the altar ahead of the service in the Catholic church, which has a large Vietnamese congregation.
Reverend Simon Nguyen said: “Today we gather to remember the people who have departed.
“These people who used to live among us, who dined with us.
“Today they are no longer with us.”
READ MORE
Man, 23, appears in court facing 41 charges in connection to Essex migrant lorry deaths
Members of the congregation performed readings as part of the vigil and candles were lit.
On Friday, Essex Police announced that it believed all the victims were Vietnamese after previously stating it was thought they were Chinese.
A spokesperson for Vietnam’s Ministry of Foreign Affairs called the incident a “serious humanitarian tragedy” in a statement on Saturday.


{% extends "../main.html" %} {% block title %}Noob Alert{% end %} {% block content %}
If you're attempting to hack us, you're not doing a very good job. This application isn't even written in PHP!


nokhwa js capture wasm test
no permission yet :(
request permission
supported media constraints:
get constraints
list of devices:
get devices
devices:
open selected device
No Stream...
Stop Stream
Capture and Download


Sign up Free!
The free budget and credit repair letter tracker
{{ authError?.message }}
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Please enter a valid email.
Password
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BIN_TO_NUM converts a bit vector to its equivalent number.
BIN_TO_NUM
Return Value
NUMBER
Syntax
BIN_TO_NUM(expr [, expr ]... )
Arguments
expr is a numeric expression with a value of 0 or 1 for the value of a bit in the bit vector.
expr
Example
BIN_TO_NUM(1,0,1,0) returns the value 10.
BIN_TO_NUM(1,0,1,0)
10


module Tins::FileBinary
Attributes
default_options[RW]
Default options can be queried/set via this hash.
Public Class Methods
included(modul)
click to toggle source
Calls superclass method
# File lib/tins/file_binary.rb, line 60 def self.included(modul) modul.instance_eval do extend ClassMethods end super end
Public Instance Methods
ascii?(options = {})
click to toggle source
binary?(options = {})
click to toggle source
Returns true if this file is considered to be binary, false if it is not considered to be binary, and nil if it was empty.
A file is considered to be binary if the percentage of zeros exceeds
options[:percentage_zeros]
or the percentage of binary bytes
(8-th bit is 1) exceeds options[:percentage_binary]
in the
buffer of size options[:buffer_size]
that is checked
(beginning from offset options[:offset]
). If an option
isn't given the one from ::default_options is
used instead.
# File lib/tins/file_binary.rb, line 35 def binary?(options = {}) options = FileBinary.default_options.merge(options) old_pos = tell seek options[:offset], Constants::SEEK_SET data = read options[:buffer_size] !data or data.empty? and return nil data_size = data.size data.count(Constants::ZERO).to_f / data_size > options[:percentage_zeros] / 100.0 and return true data.count(Constants::BINARY).to_f / data_size > options[:percentage_binary] / 100.0 ensure old_pos and seek old_pos, Constants::SEEK_SET end


| Name | URL | Poll Interval | Mail ID | Mobile Number | Mobile Provider | Status Code | Up/Down | Response Time | Delete |
|---|---|---|---|---|---|---|---|---|---|
| {{row.name}} | {{row.url}} | {{row.pollInterval}} | {{row.mailID}} | {{row.mobileNumber}} | {{row.mobileProvider}} | {{row.statusCode}} |
|
{{row.responseTime}} |


Data Management¶
GeoMesa provides many ways to optimize your data storage. You can add additional indices to speed up certain queries, disable indices to speed up ingestion, pre-split tables for optimal data distribution and migrate data between tables or environments.
Note
Currently this chapter applies only to the Accumulo Data Store.
Index Structure¶
By default, GeoMesa creates a number of indices:
- Z2 - the Z2 index uses a two-dimensional Z-order curve to index latitude and longitude
for point data. This index will be created if the feature type has the geometry type
Point
. This is used to efficiently answer queries of features with point geometry with a spatial component but no temporal component. - Z3 - the Z3 index uses a three-dimensional Z-order curve to index latitude, longitude,
and time for point data. This index will be created if the feature type has the geometry
type
Point
and has a time attribute. This is used to efficiently answer queries of features with point geometry with both spatial and temporal components. - XZ2 - the XZ2 index uses a two-dimensional implementation of XZ-ordering [1] to index
latitude and longitude for non-point data. XZ-ordering is an extension of Z-ordering
designed for spatially extended objects (i.e. non-point geometries such as line strings or
polygons). This index will be created if the feature type has a non-
Point
geometry. This is used to efficiently answer queries of features with non-point geometry with a spatial component but no temporal component. - XZ3 - the XZ3 index uses a three-dimensional implementation of XZ-ordering [1] to index
latitude, longitude, and time for non-point data. This index will be created if the feature
type has a non-
Point
geometry and has a time attribute. This is used to efficiently answer queries of features with non-point geometry with both spatial and temporal components. - Record - the record index stores features by feature ID. It is used for any query by ID. Additionally, certain attribute queries may end up retrieving data from the record index. This is explained below.
If specified, GeoMesa will also create the following indices:
- Attribute - the attribute index uses attribute values as the primary index key. This allows for fast retrieval of queries without a spatio-temporal component. Attribute indices can be created in a ‘reduced’ format, that takes up less disk space at the cost of performance for certain queries, or a ‘full’ format that takes up more space but can answer certain queries faster.
Attribute Indices¶
Some queries are slow to answer using the default indices. For example, with twitter data you might want to return all tweets for a given user. To speed up this type of query, any attribute in your simple feature type may be indexed individually.
Attribute indices may be one of two types: join or full.
Join Indices¶
Join indices store a reduced subset of data in the index - just the feature ID, the default date and the default geometry. To answer most queries, a join against the record index is required to retrieve the full simple features - hence the name join index. Joining against the record table is slow when returning many results, and should generally be avoided except for small queries.
GeoMesa will avoid joining against the record table if it is possible to answer a query with only the data in the join index. In general, this means that the query is only returning the properties for the default date, default geometry and the attribute being queried. In addition, any CQL filters must only operate on those three attributes as well.
Full Indices¶
Full indices store the full simple feature. This takes up the most space, but allows for any query to be answered without joining against the record table.
Cardinality Hints¶
GeoMesa has a query planner that tries to find the best strategy for answering a given query. In general, this means using the index that will filter the result set the most, before considering the entire query filter on the reduced data set. For simple queries, there is often only one suitable index. However, for mixed queries, there can be multiple options.
For example, given the query bbox(geom, -120, -60, 120, 60) AND IN('id-01')
, we could try to
execute against the geohash index using the bounding box, or we could try to execute against the
record index using the feature ID. In this case, we know that the ID filter will match at most one
record, while the bbox filter could match many records, so we will choose the record index.
In order to force GeoMesa to always use the attribute index when available, you may specify an attribute as having a high cardinality - i.e. having many distinct values. This implies that a query against that attribute will return relatively few records. If a query contains a filter against a high-cardinality attribute, the attribute index will always be used first.
Note that technically you may also specify attributes as low-cardinality - but in that case it is better to just not index the attribute at all.
Adding Attribute Indices¶
To index an attribute, add an index
hint to the attribute descriptor with a value of join
or
full
. The string true
is also allowed for legacy reasons, and is equivalent to join. To set
the cardinality of an attribute, use the hint cardinality
with a value of high
or low
.
Setting the hint can be done in multiple ways. If you are using a string to indicate your simple feature type
(e.g. through the command line tools, or when using SimpleFeatureTypes.createType
), you can append
the hint to the attribute to be indexed, like so:
// append the hint after the attribute type, separated by a colon
String spec = "name:String:index=full:cardinality=high,age:Int:index=join," +
"dtg:Date,*geom:Point:srid=4326"
SimpleFeatureType sft = SimpleFeatureTypes.createType("mySft", spec);
If you have an existing simple feature type, or you are not using SimpleFeatureTypes.createType
,
you may set the hint directly in the feature type:
// set the hint directly
SimpleFeatureType sft = ...
sft.getDescriptor("name").getUserData().put("index", "join");
sft.getDescriptor("name").getUserData().put("cardinality", "high");
If you are using TypeSafe configuration files to define your simple feature type, you may include the hint in the attribute field:
geomesa {
sfts {
"mySft" = {
attributes = [
{ name = name, type = String, index = full, cardinality = high }
{ name = age, type = Int, index = join }
{ name = dtg, type = Date }
{ name = geom, type = Point, srid = 4326 }
]
}
}
}
If you are using the GeoMesa SftBuilder
, you may call the overloaded attribute methods:
// scala example
import org.locationtech.geomesa.utils.geotools.SftBuilder.SftBuilder
import org.locationtech.geomesa.utils.stats.Cardinality
val sft = new SftBuilder()
.stringType("name", Opts(index = true, cardinality = Cardinality.HIGH))
.intType("age", Opts(index = true))
.date("dtg")
.geometry("geom", default = true)
.build("mySft")
Customizing the Z-Index¶
GeoMesa uses a z-curve index for time-based queries. By default, time is split into week-long chunks and indexed
per-week. If your queries are typically much larger or smaller than one week, you may wish to partition at a
different interval. GeoMesa provides four intervals - day
, week
, month
or year
. As the interval
gets larger, fewer partitions must be examined for a query, but the precision of each interval will go down.
If you typically query months of data at a time, then indexing per-month may provide better performance. Alternatively, if you typically query minutes of data at a time, indexing per-day may be faster. The default per-week partitioning tends to provides a good balance for most scenarios. Note that the optimal partitioning depends on query patterns, not the distribution of data.
The time partitioning is set when calling createSchema
. It may be specified through the simple feature type
user data using the hint geomesa.z3.interval
:
// set the hint directly
SimpleFeatureType sft = ...
sft.getUserData().put("geomesa.z3.interval", "month");
See below for alternate ways to set the user data.
Customizing Index Creation¶
To speed up ingestion, or because you are only using certain query patterns, you may disable some indices.
The indices are created when calling createSchema
. If nothing is specified, the Z2/Z3 (or XZ2/XZ3
depending on geometry type) indices and record indices will all be created, as well as any attribute
indices you have defined.
Warning
Certain queries may be much slower if you disable any indices.
Warning
It is not currently possible to add core indices after schema creation. However, attribute indices may be added at any time through map/reduce jobs - see Attribute Indexing.
To enable only certain indices, you may set a hint in your simple feature type. The hint key is
geomesa.indexes.enabled
, and it should contain a comma-delimited list containing a subset of:
z2
- corresponds to the Z2 indexz3
- corresponds to the Z3 indexrecords
- corresponds to the record indexattr_idx
- corresponds to the attribute index
Setting the hint can be done in multiple ways. If you are using a string to indicate your simple feature type
(e.g. through the command line tools, or when using SimpleFeatureTypes.createType
), you can append
the hint to the end of the string, like so:
// append the hints to the end of the string, separated by a semi-colon
String spec = "name:String,dtg:Date,*geom:Point:srid=4326;geomesa.indexes.enabled='records,z3'";
SimpleFeatureType sft = SimpleFeatureTypes.createType("mySft", spec);
If you have an existing simple feature type, or you are not using SimpleFeatureTypes.createType
,
you may set the hint directly in the feature type:
// set the hint directly
SimpleFeatureType sft = ...
sft.getUserData().put("geomesa.indexes.enabled", "records,z3");
If you are using TypeSafe configuration files to define your simple feature type, you may include a ‘user-data’ key:
geomesa {
sfts {
"mySft" = {
attributes = [
{ name = name, type = String }
{ name = dtg, type = Date }
{ name = geom, type = Point, srid = 4326 }
]
user-data = {
geomesa.indexes.enabled = "records,z3,attr_idx"
}
}
}
}
If you are using the GeoMesa SftBuilder
, you may call the withIndexes
methods:
// scala example
import org.locationtech.geomesa.utils.geotools.SftBuilder.SftBuilder
val sft = new SftBuilder()
.stringType("name")
.date("dtg")
.geometry("geom", default = true)
.withIndexes(List("records", "z3", "attr_idx"))
.build("mySft")
If the default geometry type is Geometry
(i.e. supporting both point and non-point
features), you must explicitly enable “mixed” indexing mode with geomesa.mixed.geometries
:
// append the hints to the end of the string, separated by a semi-colon
String spec = "name:String,dtg:Date,*geom:Geometry:srid=4326;geomesa.mixed.geometries='true'";
SimpleFeatureType sft = SimpleFeatureTypes.createType("mySft", spec);
Accumulo Visibilities¶
GeoMesa support Accumulo visibilities for securing data. Visibilities can be set at data store level, feature level or individual attribute level.
Data Store Level Visibilities¶
When creating your data store, a default visibility can be configured for all features:
Map<String, String> parameters = ...
parameters.put("visibilities", "admin&user");
DataStore ds = DataStoreFinder.getDataStore(parameters);
If present, visibilities set at the feature or attribute level will take priority over the data store configuration.
Feature Level Visibilities¶
Visibilities can be set on individual features using the simple feature user data:
import org.locationtech.geomesa.security.SecurityUtils;
SecurityUtils.setFeatureVisibility(feature, "admin&user")
or
feature.getUserData().put("geomesa.feature.visibility", "admin&user");
Attribute-Level Visibilities¶
For more advanced use cases, visibilities can be set at the attribute level.
Warning
Attribute level visibilities is an experimental feature and currently does not support all query types. Errors or data leaks may occur if the default date or geometry are not returned from a query due to visibilities. Future versions of GeoMesa may not support the current attribute level visibilities.
Attribute-level visibilities must be enabled when creating your simple feature type by setting the appropriate user data value:
sft.getUserData().put("geomesa.visibility.level", "attribute");
dataStore.createSchema(sft);
When writing each feature, the per-attribute visibilities must be set in a comma-delimited string in the user data. Each attribute must have a corresponding value in the delimited string, otherwise an error will be thrown.
For example, if your feature type has four attributes:
import org.locationtech.geomesa.security.SecurityUtils;
SecurityUtils.setFeatureVisibility(feature, "admin,user,admin,user")
or
feature.getUserData().put("geomesa.feature.visibility", "admin,user,admin,user");
Splitting the Record Index¶
By default, GeoMesa assumes that feature IDs are UUIDs, and have an even distribution. If your feature IDs do not follow this pattern, you may define a custom table splitter for the record index. This will ensure that your features are spread across several different tablet servers, speeding up ingestion and queries.
GeoMesa supplies three different table splitter options:
org.locationtech.geomesa.accumulo.data.HexSplitter
(used by default)Assumes an even distribution of IDs starting with 0-9, a-f, A-F
org.locationtech.geomesa.accumulo.data.AlphaNumericSplitter
Assumes an even distribution of IDs starting with 0-9, a-z, A-Z
org.locationtech.geomesa.accumulo.data.DigitSplitter
Assumes an even distribution of IDs starting with numeric values, which are specified as options
Custom splitters may also be used - any class that extends org.locationtech.geomesa.accumulo.data.TableSplitter
.
Specifying a Table Splitter¶
Table splitter may be specified by setting a hint when creating a simple feature type, similar to enabling indices (above).
Setting the hint can be done in three ways. If you are using a string to indicate your simple feature type
(e.g. through the command line tools, or when using SimpleFeatureTypes.createType
), you can append
the hint to the end of the string, like so:
// append the hints to the end of the string, separated by a semi-colon
String spec = "name:String,dtg:Date,*geom:Point:srid=4326;" +
"table.splitter.class=org.locationtech.geomesa.accumulo.data.AlphaNumericSplitter";
SimpleFeatureType sft = SimpleFeatureTypes.createType("mySft", spec);
If you have an existing simple feature type, or you are not using SimpleFeatureTypes.createType
,
you may set the hint directly in the feature type:
// set the hint directly
SimpleFeatureType sft = ...
sft.getUserData().put("table.splitter.class",
"org.locationtech.geomesa.accumulo.data.DigitSplitter");
sft.getUserData().put("table.splitter.options", "fmt:%02d,min:0,max:99");
If you are using TypeSafe configuration files to define your simple feature type, you may include a ‘user-data’ key:
geomesa {
sfts {
"mySft" = {
attributes = [
{ name = name, type = String }
{ name = dtg, type = Date }
{ name = geom, type = Point, srid = 4326 }
]
user-data = {
table.splitter.class = "org.locationtech.geomesa.accumulo.data.DigitSplitter"
table.splitter.options = "fmt:%01d,min:0,max:9"
}
}
}
}
Moving and Migrating Data¶
If you want an offline copy of your data, or you want to move data between networks, you can
export compressed Avro files containing your simple features. To do this using the command line
tools, use the export command with the format
and gzip
options:
$ geomesa export -c myTable -f mySft --format avro --gzip 6 -o myFeatures.avro
To re-import the data into another environment, you may use the import command. Because the Avro file is self-describing, you do not need to specify any converter config or simple feature type definition:
$ geomesa import -c myTable -f mySft myFeatures.avro
If your data is too large for a single file, you may run multiple exports and use CQL filters to separate your data.
If you prefer to not use Avro files, you may do the same process with delimited text files:
$ geomesa export -c myTable -f mySft --format tsv --gzip 6 -o myFeatures.tsv.gz
$ geomesa import -c myTable -f mySft myFeatures.tsv.gz
Footnotes
| [1] | (1, 2) Böhm, Klump, and Kriegel. “XZ-ordering: a space-filling curve for objects with spatial extension.” 6th. Int. Symposium on Large Spatial Databases (SSD), 1999, Hong Kong, China. (http://www.dbs.ifi.lmu.de/Publikationen/Boehm/Ordering_99.pdf) |


Guess the artist!
Hit any letter to guess. Answers are artist last names only, no spaces or special characters.
Lives left:
Letters left:
Letters already guessed:
Wins
Losses


Interests
- Watershed hydrology and ecohydrology
- Impacts of land-cover change and climate change on water resources
- Techniques for predicting streamflow in ungauged watersheds
- Hydrologic and statistical modeling
Current Projects
Vegetation Change and Streamflow in the Sierra Nevada
I am currently investigating how streamflow in California's Sierra Nevada may respond to vegetation change induced by climate change and/or disturbance. The goal of this project is to integrate field measurements of water use among different types of vegetation into the Regional Hydro-Ecologic Simulation System (Rhessys) model in order to assess the potential impact on streamflow under a range of climate scenarios. The research watersheds are located at the Southern Sierra Critical Zone Observatory (CZO) and this project represents a collaborative effort with Max Moritz (UC Berkeley) and Naomi Tague (UC Santa Barbara) with funding provided by the California Energy Commission.
Past Projects
Dissertation
Wildfire is a major source of episodic land-cover change in California watersheds, altering numerous hydrologic processes and impacting both water resources planning and ecosystem management. For my dissertation, I investigated the regional effect of wildfire on streamflow in California watersheds. A mixed-modeling approach was used to regionalize both annual streamflow and baseflow recession rates response to wildfire. In addition, the effect of antecedent storage on inter-seasonal baseflow recession rate variability was also examined.
BAR (Basin Assessment for Regionalization) Project
I worked with Allen Hope on the NASA Regional Hydrological Response of Semi-Arid Mediterranean Climate Watersheds to Land-Cover/Land-Use Variability project. We incorporated remote sensing (MODIS) data to improve predictions of streamflow in ungauged basins and evaluated streamflow response to fire in southern California and invasive vegetation in the Western Cape Region of South Africa. The research had an explicit focus on modeling uncertainty and we investigated storage configurations and parameter stability of the IHACRES rainfall-runoff model.
Publications
Bart R, Hope A (2014) Inter-seasonal variability in baseflow recession rates: The role of aquifer antecedent storage in central California watersheds. Journal of Hydrology, 519, 205-213.
Hope A, Bart R (2012) Synthetic monthly flow duration curves for the Cape Floristic Region, South Africa. Water SA, 38(2), 191-200.
Hope A, Bart R (2012) Evaluation of a regionalization approach for daily flow duration curves in central and southern California watersheds. Journal of the American Water Resources Association (JAWRA), 48(1), 123-133.
Hope A, Albers N, Bart R (2012) Characterizing post-fire recovery of fynbos vegetation in the Western Cape Region of South Africa using MODIS data. International Journal of Remote Sensing, 33(4), 979-999.
Bart R, Hope A (2010) Streamflow response to fire in large catchments of a Mediterranean-climate region using paired-catchment experiments. Journal of Hydrology, 388, 370-378.


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Sonko clashes with Sakaja, names him in shameful scandal and reveals the millions he received
by Charles OumaSonko emerges with damning allegations as vipendiree takes a new twist
Nairobi governor Mike Sonko has hit out at the County senator Johnsn Sakaja, alleging that he is among legislators who pocketed Ksh 5 Million from a popular city land grabber.
Taking to Facebook, Sonko stated that the land grabber dished out the Ksh 5 Million bribe through the ousted Nairobi county assembly majority leader Abdi Guyo who is also the Matopeni MCA.
The county boss who is under the radar of the Ethics and Anti-Corruption Commission (EACC) alleged that Makadara MP George Aladwa met Guyo at his town house and collected the bribe to be shared among legislators, including Sakaja.
"The question to ask is, what changed between Thursday 14th November 2019 and Thursday 21st November 2019 for Sakaja to change his tune. Well, what changed is that Sakaja received Ksh1.5 Million from the Ksh5 Million collected by Aladwa from Guyo, Aladwa kept Ksh1.5 Million for himself," slammed Sonko.
The governor alleged that other legislators ended up receiving Ksh 250000 each after Aladwa and Sakaja shortchanged them, lying to them that they had only received Ksh 2 Million from the land grabber.
“"Our beloved Nairobi MPs received Ksh250,000 from the landgrabber through the ousted leader of impunity and corruption who is also Matopeni MCA.
"Needless to say, reliable sources have intimated that the Matopeni Mca received Ksh10 Million from the Land Grabber but only delivered Ksh5 Million and kept the rest for himself just like Sakaja and Aladwa kept Ksh3 Million between the two of them," added the Governor.


{% extends "layout.html" %} {% block content %}
| Example: | |||||
|---|---|---|---|---|---|
| A | B | Stranded Orientation | Index Constraint | Strand Constraint | |
| P | P | A overlaps B | A same_strand_as B | ||
| N | N | B overlaps A | A same_strand_as B | ||
| P | N | N/A | |||
| N | P | N/A |
| Example: | |||||
|---|---|---|---|---|---|
| A | B | Stranded Orientation | Index Constraint | Strand Constraint | |
| P | P | B overlaps A | B same_strand_as A | ||
| N | N | A overlaps B | B same_strand_as A | ||
| P | N | N/A | |||
| N | P | N/A |
| Example: | |||||
|---|---|---|---|---|---|
| A | B | Stranded Orientation | Index Constraint | Strand Constraint | |
| P | P | N/A | |||
| N | N | N/A | |||
| P | N | B overlaps A | A opposite_strand_to B | ||
| N | P | A overlaps B | A opposite_strand_to B |
| Example: | |||||
|---|---|---|---|---|---|
| A | B | Stranded Orientation | Index Constraint | Strand Constraint | |
| P | P | N/A | |||
| N | N | N/A | |||
| P | N | A overlaps B | A opposite_strand_to B | ||
| N | P | B overlaps A | A opposite_strand_to B |


{% include 'autocode/includes/file.html' with path='autocode/code/forms.py.html' file_name='forms.py' %}
{% include 'autocode/includes/file.html' with path='autocode/code/views.py.html' file_name='views.py' %}
{% include 'autocode/includes/file.html' with path='autocode/code/urls.py.html' file_name='urls.py' %}
{% include 'autocode/includes/file.html' with path='autocode/code/admin.py.html' file_name='admin.py' %}
API Views
{% include 'autocode/includes/file.html' with path='autocode/code/api__serializers.py.html' file_name='serializers.py' %}
{% include 'autocode/includes/file.html' with path='autocode/code/api__views.py.html' file_name='api_views.py' %}
Templates
{% for model in models %}
{% include 'autocode/code/templates__{module}__{model}_form.html.html' with model=model %}
{% endfor %}
{% for model in models %}
{% include 'autocode/code/templates__{module}__{model}_list.html.html' with model=model %}
{% endfor %}
GraphQL
{% include 'autocode/includes/file.html' with path='autocode/code/graphql__query.py.html' file_name='query.py' %}
{% include 'autocode/includes/file.html' with path='autocode/code/graphql__mutation.py.html' file_name='mutation.py' %}
{% include 'autocode/includes/file.html' with path='autocode/code/graphql__schema.py.html' file_name='schema.py' %}


What is BAM?
Please refer to this document on what is BAM and how its implemented by MDW: BAM Design Document
How to collect BAM data
Set the com.centurylink.mdw.cfg property mdw.bam.url=http://lxomavmtc202.dev.qintra.com:10007/MDWWeb (for testing you can set mdw.bam.url=log).
Discover the required "bam" package
In order for your application to enable the sending of BAM messages, you have to import a "bam" workflow package into your project as follows:
- From MDW Designer, right click on your project and choose "Import Package(s)
- Select the "Discover" radio button and click "Next"
- Ensure that "bam" has been selected and click "Next" and "Finish"
BAM.xml
This file is included at package level. It defines the drop down in BAM data's Value column.
Runtime values are bound using MDW's Java EL Binding syntax.
There is a sample BAM.xml included in the MDW baseline package which looks like this
<PAGELET>
<TABLE NAME="BAM Data" VH="150">
<TEXT NAME="name" LABEL="Name" VW="150"/>
<DROPDOWN NAME="value" LABEL="Value" SOURCE="Variables">
<OPTION VALUE="#{context.masterRequestId}">masterRequestId</OPTION>
</DROPDOWN>
</TABLE>
</PAGELET>
You'll need to add the following import in your pom.xml to avoid a deploy-time exception:
com.centurylink.mdw.services.bam
Monitoring TAB in Designer
You can also Java EL Expressions in EventNames and Attributes.
Sample BAM Message
<bus:CustomEvent xmlns:bus="http://www.centurylink.com/bam">
<bus:MasterRequestId>30132</bus:MasterRequestId>
<bus:Realm>WFMT</bus:Realm>
<bus:EventName>TestBamMessage</bus:EventName>
<bus:EventTime>2013-07-05T07:43:27.139-05:00</bus:EventTime>
<bus:SubCategory>Testing</bus:SubCategory>
<bus:Attributes/>
<bus:SourceSystem>WFMT</bus:SourceSystem>
</bus:CustomEvent>
Task specific BAM Data (OSGi only)
You can capture task specific BAM data by configuring com.centurylink.mdw.workflow.task.notifier.BamTaskNotifier on the Notifier tab.
First select Template as BamTaskTemplate.html under MDW Baseline package. This file is a place holder for now and would be used for future enhancements.
If you have a email template for your email notification than you do not need to add BamTaskTemplate.html template.
You can configure multiple notifiers seperated by coma. For example for task
open notice you can have taskOpenEmail.xhtml as template and than have two notifiers configured like this com.centurylink.mdw.workflow.task.notifier.TaskEmailNotifier,com.centurylink.mdw.workflow.task.notifier.BamTaskNotifier.
Define following property in com.centurylink.mdw.cfg
mdw.bam.realm=MDW. Here instead of MDW you would have your application specific Realm like NIC or WFMT. This needs to be decided in consultation with OSR team.
Task BAM Message
Here is the sample BAM message for BAM event for a Task status change
<bus:CustomEvent xmlns:bus="http://www.centurylink.com/bam">
<bus:MasterRequestId>aa56486~131007-181507</bus:MasterRequestId>
<bus:Realm>MDW</bus:Realm>
<bus:EventName>Manojs Inline Task:Assigned</bus:EventName>
<bus:EventTime>2013-10-07T18:57:03.027-06:00</bus:EventTime>
<bus:Attributes>
<bus:Attribute><bus:Name>Name</bus:Name><bus:Value>Manojs Inline Task</bus:Value></bus:Attribute>
<bus:Attribute><bus:Name>Instance Id</bus:Name><bus:Value>30195</bus:Value></bus:Attribute>
<bus:Attribute><bus:Name>Assignee</bus:Name><bus:Value>aa56486</bus:Value></bus:Attribute>
<bus:Attribute><bus:Name>Due Date</bus:Name><bus:Value>10/07/2013</bus:Value></bus:Attribute>
<bus:Attribute><bus:Name>WorkGroup(s)</bus:Name><bus:Value>MDW Support,Dons Group,Manojs Group</bus:Value></bus:Attribute>
</bus:Attributes>
<bus:SourceSystem>MDWFramework</bus:SourceSystem>
</bus:CustomEvent>
Importing and Exporting BAM Attributes
Since BAM configuration is meant to be dynamic, it's not saved with the process definition. Rather, it's saved as override attributes of the process.
This approach makes it possible for Business Users to own BAM configuration and make changes in production (adding new data elements to report against, for example)
without worrying that their changes will be overwritten during the next package import from a dev/test environment. Users can also be confident that their changes
will not adversely affect the process design since they're saved independently.
Because of this approach, a separate export/import mechanism is used for migrating BAM configuration changes between environments.
An example of this migration is when process designers provide an initial configuration for a brand new process.
To export BAM configuration for all the processes in a workflow package, right-click on the package in Process Explorer view and select Export > Attributes > Monitoring.
In the Export Attributes dialog browse for the desired location, and click Finish. This generates an XML file that can be version controlled along with your process definitions.
To import the BAM attributes into a destination environment, right click on the project in Process Explorer and select Import > Attributes > Monitoring.
BIRT Reports
After collecting BAM data you can view the data using BIRT. In MDW, BIRT reports are designed using either Eclipse or Designer RCP.
BIRT provides extensive report design capabilities, including sophisticated crosstabs and charting, and MDW Designer exposes these capabilities so that users can create custom reports.
BIRT documentation is available in Designer under the help topic Designing Reports using BIRT.


The openEHR ref_impl_eiffel Project Developer's page
What is in this project?
There are 3 sections to this repository, as follows:
- libraries: this is where the openEHR reference model archetype models and supporting generic libraries are. Executables in this area are all test applications.
- components: re-usable
components based on the libraries are here. Includes .Net and
Java-wrapped DLLs (future: Linux .so libs) for ADL, and any other
deployable component form of the openEHR models. Will eventually include an openEHR archetype- and template-processing kernel
- apps: standalone
executable applications based on the libraries and/or components.
Includes the ADL workbench, and will eventually include EHR,
demographic and archetype servers.
Setting up for building
There are a number of steps to do to ensure you are ready to build anything, as follows:
- Download and install EiffelStudio 7.1 (free use license).
- During installation, when it asks whether to precompile the libraries, you can choose No.
- You can, if you wish, build individual projects within the EiffelStudio IDE; but if you wish to do batch command-line builds, you need SCons. SCons is a software build utility, based on Python, and it only takes a few minutes to install.
- Download and install Python 2.5 or higher. (Do not install Python 3.0 or higher!)
- Download and install SCons 2.0 or higher.
- On Windows, if you wish to build an installer for ADL Workbench, download and install NSIS.
Building
The SCons-based facility for building the entire project works on Windows, Linux and Mac.
The approach is:
- Make sure that SCons, Python and the Eiffel compiler are in your PATH.
- On Windows:
- Make sure NSIS is in your path too if you installed it.
- On Linux or Mac, make sure that you have also set the EiffelStudio environment variables. For example, on a Mac, your .profile might contain this:
- export ISE_PLATFORM=macosx-x86
- export ISE_EIFFEL=/Applications/MacPorts/Eiffel71
- export GOBO=$ISE_EIFFEL/library/gobo
- export ES_PATH=$ISE_EIFFEL/studio/spec/$ISE_PLATFORM/bin
- export PATH=$ES_PATH:$GOBO/spec/$ISE_PLATFORM/bin:$PATH
- Open a Windows command window, or a Linux or Mac terminal window.
- Change directory to the project root directory.
- To build all of the binaries, simply type scons.
SCons provides many other options, depending how and what you want to build. For example:
- To build just ADL Workbench, type scons adl_workbench.
- To create installers for the current platform, specify a file or directory target that contains oe_distrib as a path component. For example, to build the installers below the current directory's parent, type scons ../oe_distrib/.
- For a list of the SCons command-line options, type scons -h.
Building without SCons is not hard. Just start EiffelStudio by hand and then tell it to build from an existing ECF file.
Depending on what you want to build, you just select the ECF file in the appropriate directory.
Build Targets (what can I build?)
The current build targets are as follows:
- libraries area:
- common_libs\test\app - a tester for dADL, method dispatcher, units library and others; (currently not being maintained - out of date!)
- openehr\test\app - a tester for the openEHR reference model classes (currently not being maintained - out of date!)
- component area:
- components\adl_parser\test\app - a tester for the ADL parser (currently not being maintained - out of date!)
- components\adl_parser\lib\dotnet_dll - the .NET DLL form of the ADL parser
- components\adl_parser\lib\java_lib - the JNI-wrapped DLL form of the ADL parser (currently not being maintained - out of date!)
- apps area:
- apps\adl_workbench\app - adl_workbench, an EiffelVision2-based GUI application for ADL parsing, viewing and saving.
Parser Grammars
The following are links to the grammars of the various parsers:


{% load staticfiles %}
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Pakistan: Court reserves judgment in Musharraf's treason case, verdict on Nov 28
The hearing in the case, however, was stalled after Musharraf left for Dubai for medical treatment in March 2016.
by ANIIslamabad: A special court in Islamabad on Tuesday reserved its judgment in the high treason case against former Pakistan President Pervez Musharraf, and said that the verdict would be announced on November 28.
The three-member bench of the court, headed by Justice Waqar Ahmad Seth, directed Musharraf's counsel to submit its written argument by November 26, Dawn reported.
The high treason case against Musharraf was filed by the Pakistan Muslim League-Nawaz (PML-N) government in 2013, alleging that the army general-turned-president had unlawfully suspended the Constitution with the help of the military and instituted an emergency rule in 2007.
Musharraf was indicted on March 31, 2014, and the prosecution had tabled the entire evidence before the special court in September the same year.
The hearing in the case, however, was stalled after Musharraf left for Dubai for medical treatment in March 2016.
Catch the latest news, live coverage and in-depth analyses from India and World. Follow us on Facebook and Twitter.


Info Directory
Aliens Are real
The Shape of the Earth
The Moon Landing was a Hoax!
Credits
2020 Asher Seiling


---
title: How Big Data is Changing Marketing Analytics
date: '2015-07-20T19:00:20+05:30'
tags:
- ml
tumblr_url: https://sureshshanmugam.com/post/124572938714/how-big-data-is-changing-marketing-analytics
---
How Big Data is Changing Marketing Analytics


--- layout: null permalink: /example-post-payment-paypal-subscription/ title: description: sitemap: priority: 0.1 exclude: true pageVarTest: "test {{asd}}" ---


Total Time:       Prep:      Level: Easy      Serves: 4
Buffalo Baked Ziti
Buffalo is the pasta sauce you never knew you needed.
Ingredients
kosher salt
10 oz. ziti
2 tbsp. butter
3 cloves garlic, minced
2 tbsp. all-purpose flour
2 c. milk
6 oz. cream cheese, softened
1/4 c. Frank's Red Hot (or other hot sauce)
1 tbsp. Ranch seasoning
2 c. shredded rotisserie chicken
1/4 c. freshly chopped chives, plus more for garnish
1 c. shredded white Cheddar
Directions
Preheat oven to 350°. In a large pot of salted boiling water, cook pasta until al dente. Drain and return to pot.
Make sauce: In a large skillet over medium heat, melt butter. Add garlic and cook until fragrant, then add flour and whisk to combine.
Cook 1 minute. Add milk and whisk until combined and no clumps remain. Simmer until thickened, 2 minutes. Add cream cheese and break up with a wooden spoon until melted and combined.
Add Frank’s and ranch seasoning and stir until combined.
Add chicken, chives, and cooked ziti to skillet and stir until pasta is completely coated. Top with a layer of cheddar and bake until melted and golden, 15 minutes.


Immunization Project
This app shows the success of programs using the
measles vaccine
in different countries, across different years. It is based on four related
datasets from PROVIDE SOURCE HERE, described below.
NOTE: Given the large amount of data presented, this app best viewed
on a desktop computer with a large monitor, and a browser expanded to occupy
most or all of the screen.
Datasets to explore:
- Deaths - deaths caused by
vaccine-preventable diseases, varied by country and year. (Original
dataset includes other diseases, but here limited to measles.)
- Coverage - measles vaccine
coverage varied by country and time. Also includes total population of
each country as a demographic comparison.
- Children - share of young
children (12-23 months) vaccinated by country and year.
- Disagrees - 2015 evaluation
of share of population that disagrees vaccines are safe. Varied by
country.
The following plot shows the distribution of the available data to help guide your
exploration.


Ezekiel 24:10
Heap on wood, kindle the fire, consume the flesh, and spice it well, and let the bones be burned.


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--- layout: post title: Ryan Bates subtitle: How to become successful rubyist teaser: Staying focused and motivating myself is a challenge. I like to dedicate blocks of time to working on something and avoid interruptions. thumb: upic-bates.jpg category: freelance ---
Ryan host and produce Railscasts — free Ruby on Rails screencasts.
I was working on a large PHP site which was getting unwieldy. I looked into alternatives and Ruby on Rails seemed like the best choice. I first used it to build a smaller site and then rewrote the larger PHP app in it.
Where, and how, do you search for work now? Can you give me some advice on the best ways to find Ruby related work?
I am still employed full time at that same job. However I have received offers for consulting and other projects. It helps to get your name out there and build up a reputation in the community. Create some open-source tools that are useful to others and help answer questions. You will learn a lot from this. Also add your name to workingwithrails.com and start building a profile.
There are also several job sites out there which can help you find something. If you can't find anything in your local area consider working remotely.
What advice would you give a Ruby beginner without any projects ready to show?
If you are new to programming and Ruby, start with some beginner books and tutorials. However, there comes a time shortly afterwards you need to leap into a real project. Start with something small but is useful in the real world. Half of the battle then is learning how to use Google and research topics which you aren't familiar with.
What books, or sites, or recipes, or whatever else you can recommend (they may be about productivity, or negotiation, or thinking - anything you think will help me live a better life as a programmer)?
The Pragmatic Programmer is one of my favorite books on programming along with Refactoring. However neither of these are going to do much for you if you do not keep programming and continue looking for ways to improve yourself.
There are hundreds of great sites on Ruby and Rails, too many to list here. But ultimately you want to get very familiar with the documentation: reading RDocs, etc. Beyond this there are a ton of blogs and other useful tutorials. I usually just use Google to find the resources I need for a given task.
How much time per week do you work? How do you keep yourself productive and focused?
I have a full time job working on a Ruby on Rails site, however I also work on Railscasts during the weekends. Staying focused and motivating myself is a challenge. I like to dedicate blocks of time to working on something and avoid interruptions.
I keep a very simple todo list which is just a text file of the various things I want to accomplish that day or week. I have tried many productivity applications but I find I spend too much time organizing my tasks rather than doing them. Keeping it plain text helps.
Mac OS X Terminal, TextMate and Safari are the primary applications I use. I rarely find the need to go outside of these.
Thanks for the interview!
Thank you very much!


--- layout: default title: About ---
Swipe To Unlock is a website for tips about computers away from the desk.
We all carry mobile phones in our pockets and many of us have iPads on our sofa, which are just as powerful as the laptops on our desk. And being within arms reach at all times, these devices are often more useful and convenient.
But are we using them the best we can? There’s so many hidden features which you probably didn’t know about, better ways to do things, and a world of apps out there.
My mission is to share as much as I can, and who knows: you may find something to make your device using life that much easier!


English | Estonian
Current language: English
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Change comment count
Generate translation object


Police discover three family members dead in Benue
by Agency ReportThe Benue State Police Command on Friday confirmed the discovery of three corpses belonging to one family in their room situated in North-Bank area of Makurdi metropolis.
The State Police Public Relations Officer (PPRO), Catherine Anene, a deputy superintendent of police, who confirmed the bizarre happening to News Agency of Nigeria (NAN) in Makurdi, said investigations were ongoing to unravel the cause of death.
The PPRO also disclosed that a little girl was found in the room where the dead bodies were discovered completely unhurt but too small to give useful information.
She said the cause of death was still unknown but added that all dead bodies had no physical injuries to warrant an immediate determination of cause of death.
READ ALSO: Two secondary school students drown in Ekiti river
She, therefore, appealed to members of the public with useful information on the “sad event” to report to the nearest security agencies for necessary action.
“The incident was reported today (Friday) and when our men rushed to the scene we discovered three dead bodies: a man, his wife and son all dead, ” she said.
Some of the neighbours described the deceased family members as “peaceful” and wondered what could have happened.
(NAN)


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Like the parables the blind men and an elephant, Software engineering means different things to different people. -caption- The parable, originating in India, is that six blind men, who knew nothing about an elephant, found one and started learning what it is by touching it. Each man touches a different part of the elephant, and forms his opinion on that basis. The moral is that each of us may be partially right about some matter.
I see software engineering problems falling in four broad categories: algorithmic, design, scalability and systems. There are fractions of these components in all the problems, so a given problem does not fall in exactly one of these categories, but may involve components from all to varying degrees.
Algorithmic problems are about coming up with algorithms for hard problems. How to you translate speech to text? How do you sort a billion numbers in a short amount of time? How can you detect numbers in images? Google, in its intial phase when it wrote a search engine, would be an example of such a company. Its main product was the implementation of page rank algorithm. Another example would be Swift Key, a keyboard extension for mobile phones, an app that predicts and auto corrects what you are typing on your mobile device.
Another set of algorithmic problems are designing compression algorithms (which are used by tools such as gzip, bzip or snappy) and cryptographic algorithms (which are used, for instance by protocols such as SSL)
People good in solving algorithms problems are usually good in Mathemtics too. Indeed a lot of algorithm techniques, like machine learning, require a grounding in higher mathermatics such as probability, statistics and calculus.
The second kind of problems are design problem. Algorithm might be clear, but the challenge is to organize the code in such a way that real world requirements can be delivered fast, and the resultant code is of high quality (few bugs) and is maintanable. Suppose you want to make a software for a bank. You need to model customers, accounts, fixed deposits, bank branches, bank employees etc. What class structure would you make? What interfaces would you require? How do you gather the requirements, and how do you test the code. Nothing is intrinsically hard (unlike the algorithmic problem), but you need to design and organize your code well.
Example of such a problem would be writing a web development framework like Python Django, or Ruby on rails. Another example would be popular single page application frameworks like React or AngularJS.
People working on design problems like to talk about design patterns, fitting well known patterns to solve their specific problems. They may also talk about dependency injection, which is about writing code in a way that it is easily testable. They spend time discussing various interfaces and subclasses. They may also talk about microservices, in which each services is isolated from each other for easy development.
Third kind of of problems in computer science are scalability problems. The task to be done might be quite straightforward, both algorithmically and from design perspective, but simple solutions may cease to work, or required too much hardware as the load on the system increases.
A typical problem would be designing a simple data ingestion system, which receives requets on HTTP and puts the data in a database. A straight forward solution might be coded up in a few hours (or even a few minutes), but it may take weeks or months to scale it as per your needs.
People talking about scaling problems talk about using caches (to avoid repeated computations). They talk about batching and bulk operations, serving several requests together to amortize the resource usage. They talk about load balancers (using a software to route the requests to one of many systems) and auto scaling of server fleet in cloud (which is sizing the number of servers as per the current load, to not spend more money on servers than required). They also talk about consistent hashing, which enables sizing up and down of machines holding hashed data, so that number of misses are minimized when you resize your fleet and the hashing function changes accordingly.
Lastly, there are "systems" problem solving which requires deep knowledge of computer systems, and the solution too does not directly solve a real world problem, but creates a tool which can be used to solve a real world problem. These problems are designing and implementing a compiler, for example. Or perhaps an operating system. An amazing company solving a systems problem is my alma-mater VMware.
Finally, note that most problems often have all these characterstics, to varying charcterstics. And the proportion of these characterstics changes with the evolution of a company.
For instance, Facebook started with, hardly being a computer science problem (How hard it is to put pages, showing a everyone's profile and allowing others to comment on it?), but as it evolved, it became a design problem. There are people and pages and feed items and ads and notifications and so on. How these various systems interact with each other, how should various database be designed is a grand design problem. Then, Facebook faced scalability problems as well as its servers were required to serve pages to millions of users. As it evolved facebook solved several algorthmic problems (such as how to detect faces in a photos so as to prompt users to tag them, and how to show a personalized feed to each other so that users are engaged). Along the way, facebook solved several systems problem too, like designing Hiphop compiler to translate PHP code to C++ to reduce infrastructure costs.
Similarly Google started by solving an algorithmic problem, but along the way solved scalability problems and systems problem. And when a system is sufficiently complicated you need it well designed.


{% extends 'layout.html' %} {% block pageTitle %} Inset {% endblock %} {% block beforeContent %} {{ breadcrumb({ href: "/docs", text: "Home" }) }} {% endblock %} {% block beforeMain %} {% endblock %} {% block content %}
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Vaccine studies are the only way to find effective vaccines. Thank you for helping the NHS to save lives.
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<EMAIL_ADDRESS>You will get an email if researchers think you may be suitable for their coronavirus vaccine studies. The email may come directly from researchers, or from NHS Digital.
In England, the research partner of the NHS is the National Institute for Health Research (NIHR). The NIHR is working with equivalent NHS research partners in Northern Ireland, Scotland and Wales on vaccine studies. If you sign up to be contacted about vaccine studies, only researchers on studies approved by NIHR will be able to contact you.
You can find out more information about the vaccine studies on NIHR's Be Part of Research website.
There is no guarantee you'll be contacted to be part of vaccine studies. If you are not contacted, this will be because researchers already have the mix of people they need.
If a researcher asks you to take part in their study, you do not have to say yes. It's your choice.
If you agreed to NHS Digital contacting you about how the coronavirus vaccine studies are going, and developments to this service including the chance to take part in other health research, they will contact you when there's new information to share. You will be able to unsubscribe at any time.
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A mathematically rigorous approach to quantum field theory based on operator algebras is called an algebraic quantum field theory. It has a long history since pioneering works of Araki, Haag, Kastker. (See [22] for a general treatment of algebraic quantum field theory.) This theory works on Minkowski spaces on any spacetime dimension, and there have been some recent results on curved spacetimes or even noncommutative spacetimes. In the case of -dimensional Minkowski space with higher spacetime symmetry, conformal symmetry, we have conformal field theory and there we have seen many new developments in the recent years, so we survey such results here. Our emphasis is on representation theoretic aspects of the theory and we make various comparison with another mathematically rigorous and more recent approach to conformal field theory, that is, theory of vertex operator algebras.


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"""Orchestrator for building wheels from InstallRequirements. """ # The following comment should be removed at some point in the future. # mypy: strict-optional=False import logging import os.path import re import shutil from pip._internal.models.link import Link from pip._internal.operations.build.wheel import build_wheel_pep517 from pip._internal.operations.build.wheel_legacy import build_wheel_legacy from pip._internal.utils.logging import indent_log from pip._internal.utils.misc import ensure_dir, hash_file, is_wheel_installed from pip._internal.utils.setuptools_build import make_setuptools_clean_args from pip._internal.utils.subprocess import call_subprocess from pip._internal.utils.temp_dir import TempDirectory from pip._internal.utils.typing import MYPY_CHECK_RUNNING from pip._internal.utils.urls import path_to_url from pip._internal.vcs import vcs if MYPY_CHECK_RUNNING: from typing import ( Any, Callable, Iterable, List, Optional, Pattern, Tuple, ) from pip._internal.cache import WheelCache from pip._internal.req.req_install import InstallRequirement BinaryAllowedPredicate = Callable[[InstallRequirement], bool] BuildResult = Tuple[List[InstallRequirement], List[InstallRequirement]] logger = logging.getLogger(__name__) def _contains_egg_info( s, _egg_info_re=re.compile(r'([a-z0-9_.]+)-([a-z0-9_.!+-]+)', re.I)): # type: (str, Pattern[str]) -> bool """Determine whether the string looks like an egg_info. :param s: The string to parse. E.g. foo-2.1 """ return bool(_egg_info_re.search(s)) def _should_build( req, # type: InstallRequirement need_wheel, # type: bool check_binary_allowed, # type: BinaryAllowedPredicate ): # type: (...) -> bool """Return whether an InstallRequirement should be built into a wheel.""" if req.constraint: # never build requirements that are merely constraints return False if req.is_wheel: if need_wheel: logger.info( 'Skipping %s, due to already being wheel.', req.name, ) return False if need_wheel: # i.e. pip wheel, not pip install return True # From this point, this concerns the pip install command only # (need_wheel=False). if not req.use_pep517 and not is_wheel_installed(): # we don't build legacy requirements if wheel is not installed return False if req.editable or not req.source_dir: return False if not check_binary_allowed(req): logger.info( "Skipping wheel build for %s, due to binaries " "being disabled for it.", req.name, ) return False return True def should_build_for_wheel_command( req, # type: InstallRequirement ): # type: (...) -> bool return _should_build( req, need_wheel=True, check_binary_allowed=_always_true ) def should_build_for_install_command( req, # type: InstallRequirement check_binary_allowed, # type: BinaryAllowedPredicate ): # type: (...) -> bool return _should_build( req, need_wheel=False, check_binary_allowed=check_binary_allowed ) def _should_cache( req, # type: InstallRequirement ): # type: (...) -> Optional[bool] """ Return whether a built InstallRequirement can be stored in the persistent wheel cache, assuming the wheel cache is available, and _should_build() has determined a wheel needs to be built. """ if not should_build_for_install_command( req, check_binary_allowed=_always_true ): # never cache if pip install would not have built # (editable mode, etc) return False if req.link and req.link.is_vcs: # VCS checkout. Do not cache # unless it points to an immutable commit hash. assert not req.editable assert req.source_dir vcs_backend = vcs.get_backend_for_scheme(req.link.scheme) assert vcs_backend if vcs_backend.is_immutable_rev_checkout(req.link.url, req.source_dir): return True return False base, ext = req.link.splitext() if _contains_egg_info(base): return True # Otherwise, do not cache. return False def _get_cache_dir( req, # type: InstallRequirement wheel_cache, # type: WheelCache ): # type: (...) -> str """Return the persistent or temporary cache directory where the built wheel need to be stored. """ cache_available = bool(wheel_cache.cache_dir) if cache_available and _should_cache(req): cache_dir = wheel_cache.get_path_for_link(req.link) else: cache_dir = wheel_cache.get_ephem_path_for_link(req.link) return cache_dir def _always_true(_): # type: (Any) -> bool return True def _build_one( req, # type: InstallRequirement output_dir, # type: str build_options, # type: List[str] global_options, # type: List[str] ): # type: (...) -> Optional[str] """Build one wheel. :return: The filename of the built wheel, or None if the build failed. """ try: ensure_dir(output_dir) except OSError as e: logger.warning( "Building wheel for %s failed: %s", req.name, e, ) return None # Install build deps into temporary directory (PEP 518) with req.build_env: return _build_one_inside_env( req, output_dir, build_options, global_options ) def _build_one_inside_env( req, # type: InstallRequirement output_dir, # type: str build_options, # type: List[str] global_options, # type: List[str] ): # type: (...) -> Optional[str] with TempDirectory(kind="wheel") as temp_dir: if req.use_pep517: wheel_path = build_wheel_pep517( name=req.name, backend=req.pep517_backend, metadata_directory=req.metadata_directory, build_options=build_options, tempd=temp_dir.path, ) else: wheel_path = build_wheel_legacy( name=req.name, setup_py_path=req.setup_py_path, source_dir=req.unpacked_source_directory, global_options=global_options, build_options=build_options, tempd=temp_dir.path, ) if wheel_path is not None: wheel_name = os.path.basename(wheel_path) dest_path = os.path.join(output_dir, wheel_name) try: wheel_hash, length = hash_file(wheel_path) shutil.move(wheel_path, dest_path) logger.info('Created wheel for %s: ' 'filename=%s size=%d sha256=%s', req.name, wheel_name, length, wheel_hash.hexdigest()) logger.info('Stored in directory: %s', output_dir) return dest_path except Exception as e: logger.warning( "Building wheel for %s failed: %s", req.name, e, ) # Ignore return, we can't do anything else useful. if not req.use_pep517: _clean_one_legacy(req, global_options) return None def _clean_one_legacy(req, global_options): # type: (InstallRequirement, List[str]) -> bool clean_args = make_setuptools_clean_args( req.setup_py_path, global_options=global_options, ) logger.info('Running setup.py clean for %s', req.name) try: call_subprocess(clean_args, cwd=req.source_dir) return True except Exception: logger.error('Failed cleaning build dir for %s', req.name) return False def build( requirements, # type: Iterable[InstallRequirement] wheel_cache, # type: WheelCache build_options, # type: List[str] global_options, # type: List[str] ): # type: (...) -> BuildResult """Build wheels. :return: The list of InstallRequirement that succeeded to build and the list of InstallRequirement that failed to build. """ if not requirements: return [], [] # Build the wheels. logger.info( 'Building wheels for collected packages: %s', ', '.join(req.name for req in requirements), ) with indent_log(): build_successes, build_failures = [], [] for req in requirements: cache_dir = _get_cache_dir(req, wheel_cache) wheel_file = _build_one( req, cache_dir, build_options, global_options ) if wheel_file: # Update the link for this. req.link = Link(path_to_url(wheel_file)) req.local_file_path = req.link.file_path assert req.link.is_wheel build_successes.append(req) else: build_failures.append(req) # notify success/failure if build_successes: logger.info( 'Successfully built %s', ' '.join([req.name for req in build_successes]), ) if build_failures: logger.info( 'Failed to build %s', ' '.join([req.name for req in build_failures]), ) # Return a list of requirements that failed to build return build_successes, build_failures


{% extends 'layout-bsa.html' %} {% block pageTitle %} What are you studying at Northumbria University? - LIS training - NHSBSA {% endblock %} {% block outerContent %} {% endblock %} {% block content %}
If you're not sure what your term dates are, visit your student portal, or your college or university's website.


This is Bara'ah and I'm 29 years old. I'm a French lecturer at the university of Jordan and I really like teaching. This year, I became interested in progamming languages since it became the language of this era, so in order to be part of this numeric world, I decied that I should be involved in this field.
education and experience
- I have a BA in French language and litterature and a master's degree in translation
- I have a modest expreince t=in teaching Arabic to non native speakers from the university of Jordan
- I teach French at the university of Jordan
As a matter of fact, there's one thing made me more interested about programming is that there is something in common between learning other languages and programming: they're both languages so they both demand time, patience and dedication. They both remind us, as well, taht hard work will eventuallly pay off.


Github repo.
C
🍪🍪
kie Consent
Simple,
lightweight
&&
cross-browser
cookie-consent plugin written in
vanilla js
.
Current settings
Current theme:
light theme
Current cookie_value:
Api calls
Show cookie modal
Show cookie settings
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open cookie settings


The course which I created almost 8 years ago. The quality of this is not superior, but on the other hand, I received few messages with thanks for helping passing university assembler exams with this course :)


--- layout: archive title: Zulip Chat Archive permalink: /stream/113489-new-members/topic/Complete.20lattices.20and.20subsets.html ---
Continuing on my example of defining a sequence of strictly increasing elements based on some hypothesis over orders.
I'm trying to see what are the minimal hypothesis on the order to define such a sequence. Mathematically, it seems like I only need to have the existence of min over the set S of X.
lemma st_increasing_seq [linear_order X] {S: set X} (Hlattice: complete_lattice S) (Hinf: set.infinite S): (∀ M ⊆ S, M.nonempty → (complete_lattice.Inf M ∈ M)) → ∃ x : ℕ → X, st_increasing x ∧ (range x) ⊆ S := sorry
The closest to I wanted was complete_lattice
(but it also requires sups…), I wanted to use semilattice for infs only but it does not define a Inf over sets.
Worse, the above code does not type-check because it complains about the fact that X is not a complete lattice, which I understand.
But at the same time, I don't want all X to be a complete lattice, it could be a conditionally complete lattice in fact only.
Also, it seems like what I really want is (S, ≤) is well-ordered, maybe it could solve everything.
What's the best thing to do?
There are things like semilattice_inf
if this helps.
There are a gazillion kinds of lattice.
It does not declare a Inf: set a → a
, right? https://leanprover-community.github.io/mathlib_docs/order/lattice.html#lattice.to_semilattice_inf
There's a difference between inf
(inf of two elements) and Inf
(inf of arbitrary set of elements)
Indeed, so that's why I resorted to complete_lattice / conditionally_complete_lattice which seems to be the only one to declare the Inf
(and not inf
).
I just made up semilattice_inf, hang on.
Can you ask your question again? I don't really know what I'm looking for.
There is a ton of stuff in order.lattice
I would like to be able to take the Inf of a set, without supposing that there is a complete_lattice over X (the type), but over the set S and be able to get the complete_lattice property for all subsets of S.
let's say X = R, S = [a, +infty[, if you prefer. S is a semilattice_inf and all its subsets too.
But right now, I don't know how to translate those facts in Lean.
I don't see any Inf in order.lattice
, it does not define operations over arbitrary sets. :/
I really don't know my way around the lattice stuff. Is it called infi
?
It certainly exists.
infi
is in order.complete_lattice
as is Inf
I see, there is nothing about them
Kevin Buzzard said:
I really don't know my way around the lattice stuff. Is it called
infi
?
As far as I understand it, infi
is indexed inf, which is something I don't think I need
You can just make what you want, right?
Kevin Buzzard said:
I see, there is nothing about them
I could PR something to add Inf
for semilattice_inf, etc, if that's something mathlib would be interested in. But I'd need some guidance for math relevance.
Kevin Buzzard said:
You can just make what you want, right?
Indeed, just wanted to ensure that I was not reinventing the wheel.
Yeah you should talk to a more latticy person.
Existence of Inf
implies existence of Sup
and vice versa
Actually, I think you want to not have any lattice like assumption, and just have a hypothesis that says every set in M
has a minimal element, this exists as a predicate
@Ryan Lahfa
BTW, probably we should add a constructor for complete_lattice
that takes Inf
and autogenerates Sup
, and use it for submonoid
s, subgroup
s etc.
I thought that already existed
Can't find it in complete_lattice
.
Mario Carneiro said:
Actually, I think you want to not have any lattice like assumption, and just have a hypothesis that says every set in
M
has a minimal element, this exists as a predicate
Looks the simplest way, but I'd need some way to get it for free for obvious fields which verifies complete_linear_order or even conditionnally_complete_linear_order X which are complete_linear_order over a bounded subset.
Make it a simp-lemma if the instance exists.
Then it doesn't vanish completely
Or alternatively provide a special case of the lemma if the instance is there
Sounds good!
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| File | Statements | Branches | Functions | Lines | |||||
|---|---|---|---|---|---|---|---|---|---|
| src/ | 83.56% | 122/146 | 65.52% | 38/58 | 96.67% | 29/30 | 78.38% | 87/111 | |
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++
) and dereference (*
) operators).++
). But other kinds of iterators are possible. For example, each container type (such as a list) has a specific iterator type designed to iterate through its elements.| category | properties | valid expressions | |||
|---|---|---|---|---|---|
| all categories | copy-constructible, copy-assignable and destructible | X b(a); | |||
| Can be incremented | ++a | ||||
| Random Access | Bidirectional | Forward | Input | Supports equality/inequality comparisons | a == b |
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| Output | Can be dereferenced as an lvalue (only for mutable iterator types) | *a = t *a++ = t | |||
| default-constructible | X a; X() | ||||
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| Can be decremented | --a a-- *a-- | ||||
| Supports arithmetic operators + and - | a + n n + a a - n a - b | ||||
| Supports inequality comparisons (<, >, <= and >=) between iterators | a < b a > b a <= b a >= b | ||||
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