The way it all started was: How many people needed in a room to have at least 50% chance that three or more of them share the same birthday?
This is much more difficult to calculate than the standard 2 person problem.
Originally seen on R-bloggers that referenced a problem from the Riddler with a solution in the Riddler as the solution to last week’s Riddler Classic.
The problem is easily generalized to how many people required such that M
of them have the same birthday.
Some discussion on stackexchange is sort of confusing but might have some interesting ideas. There are some closed form solutions (and approximations). According to one of the comments the closed form solutions are wrong (they include some double counting) so I looked into the correct solution (see section on Direct Solution below).
The easiest thing to do is Monte Carlo but the case of three people is hard to calculate since P(n=87 people) is almost (but not quite) 50%. The solution for 88 people is well above 50% so that isn’t too difficult to calculate.
This started me looking into the confidence interval for a Monte Carlo simulation. I didn’t really find any good answers other than to assume we have a normal or binomial distribution and just use the traditional confidence intervals based on the statistics of the Monte Carlo variable itself. The standard deviation of the Monte Carlo samples is used along with the square root of the number of samples in the classical confidence interval calculation
I couldn’t actually find a good web site for this. The best I found was a pdf from the Army talking about simulations of weapon systems. This was fairly good and suggested using the classical confidence iterval as one of three methods. As a note: the results in Table 4 for the Length of the Half-Width are off by a factor of 10 (too large) for the cases of 10K and 100K samples.
The main problem is that the probability for n=87 people is very close to 50% (about 49.945%) so you need a relatively large number of samples to have statistical confidence that this is actually less than 50%. This is compounded by the fact that even a small error in the Monte Carlo data results in a large change in the estimate for the required number of samples.
In thirty separate Monte-Carlo simulations of the case n=87 people with one million trials per simulation I have the following results:
27 trials have mean < 0.5
3 trials have mean > 0.5
All trials have std ~ 0.5
6 trials achieve statistical significance, 24 did not.
The most significant trial had z ~ 3.86, p < 5.7e-5
The worst trial had z ~ 1.24 in the wrong direction, p ~ 0.1075
Pooled mean = 0.4993917
Pooled significance: z ~ 6.66, p < 1.4e-11
The full set of data seems to safely indicate significance has been achieved - but how do you estimate that from the individual trials? That is difficult. Maybe the best solution is just to be mindful of the risks and run as many trials as you can.
The variation in results is explored in detail below.
For the simulation about half the samples are 1 and half are 0. The standard deviation is about 0.5 (the theoretical max) so, for 95% confidence we require:
(0.5-mean(sim_data))/(std(sim_data)/sqrt(num_samples))>1.96
or
sqrt(num_samples) > 1.96*std(sim_data)/(0.5-mean(sim_data))
or
num_samples > (1.96*std(sim_data)/(0.5-mean(sim_data)))**2
If I knew the true mean ahead of time I could estimate the number of samples. If I have to use the mean of the sample data this may be very sensitive to small errors in the simulated result (note we are almost dividing by zero!).
If we knew the true mean we would calculate:
num_samples > ((1.96*0.5)/(0.5-0.499454850632))**2
num_samples > 3.2e6
Unfortunately, when I use actual simulation data I get a much different result. Sometimes the simulation is actually larger than 0.5!
In one trial of 1e6 samples I have the following data:
mean(sim_data) = 0.499741
std(sim_data) = 0.5
By itself, this does not achieve 95% confidence:
(0.5-0.499741)/(0.5/sqrt(999999)) = 0.52 < 1.96
Using these statistics I would estimate a much larger number of samples:
num_samples > ((1.96*0.5)/(0.5-0.499741))**2
num_samples > 14.3e6
Using a different simulation run, however, I achieve significance and estimate a much lower number of samples:
mean(sim_data) = 0.498731
(0.5-0.498731)/(0.5/sqrt(1e6-1)) = 2.54 > 1.96
and
num_samples > ((1.96*0.5)/(0.5-0.498731))**2
num_samples > 0.6e6
The moral of the story – Monte-Carlo simulations are hard when the result is close to some critical value. Conclusions about statistical significance and number of samples may vary wildly with the results of the simulation.
The run-time for 1e6 trials is ~9.5 seconds in Python and ~13.5 seconds in R.
Python code sample:
# Return P(less than 3 people with same birthday)
def foo2(num_people=88, num_trials=1000000):
n=0
for i in range(num_trials):
m=bincount(randint(1,366,num_people))
if any(m>2):
n=n+1
p=1-n/num_trials
return(p)
In [196]: 1-foo2(87)
Out[196]: 0.498822
In [197]: 1-foo2(88)
Out[197]: 0.51059
The generalized result is shown below:
This site has the best explanation of solving this problem and also provides Python code: Python Code for a direct solution has been tested (see three_birthday_combinatoric.py). This purportedly corrects some errors in the stackexchange solutions noted above. I have looked at the stack exchange solutions (birthday_stack.py
) and they seem to work properly for the case of 3 birthdays (birthday
and birthday2
) but the solution proposed by Trazom for the general case (birthday3
) seems to be wrong. His solution works for M=3 but not for other values. I have not investigated to find out why this is broken. The code, here, however works for all tested combinations and the explanation seems correct.
To simplify (?) his explanation: suppose we had a function that counted the number of ways N items can be allocated into k bins with at most M items in a bin. Call this function F(M,N,k). We don’t know this function, but we know a few things:
The probability that at least one of the bins has M or more items is:
P = 1-F(M-1,N,365)/365^N
The value of F(M-1,N,365) is all the ways we can have less than M in a bin so this is just the complementary probability. This is what we are looking for. Consider the simplest case – only one bin:
For k=1 (e.g. one bin)
F(M,N,1) = 1 for 0 <= N <= M and 0 elsewhere
Basically, if we have (up to) M items we can stuff them all in one bin. If we have more than M items then we can’t stuff them into a bin because M is the maximum we are allowed. If we have negative items we can’t stuff them into a bin but I can’t think of the physical meaning of this.
The final thing we know is:
Assume the first bin contains m items with 0 <= m <= M
There are C(N,m) ways to form this combination
The remaining number of items is N-m
The remaining number of bins is k-1
The number of ways to combine the remaining items is F(M,N-m,k-1)
If we add up all the different values of m we get:
F(M,N,k) = Summation(C(N,m) * F(M,N-m,k-1), m=0, 1, ..., M)
This means we have a way to calculate F(…,k) from F(…,k-1). If we start with the case of k=1 we can then generate the results for k=2, k=3, …, all the way up to k=365 (the number of days in the year).
We need to keep storage for the current value of k and the new value of k. Once the new value of k has been calculated it can replace the old. The storage is a vector of 0, 1, 2, …, N items.
We can populate the vector for the case k=1 (we know that). Then we need to update the vector and summation for k=2, 3, …, 365 (e.g. only 364 updates).
The code on the website calculate F(M-1,N,365):
The vector of N+1 items is initialized in current_row[]
The outer loop runs 364 times by using d in range(1,365)
n varies from 0 to N using range(N+1) to access all elements
and update the vector in new_row[]
m varies from 0 to M-1 using range(M) for the summation
as m varies we accumulate the C(N,m)*F(M,N-m,k-1) values
After new_row[] is complete put the results in current_row[]
There is a subtlety in the m loop range: min(n+1,M). This prevents
the code from attempting to access F(m,n-m,k) for n-m < 0. Note that
this calculates F(M-1,...) since Python loops don't incude the end point.
When we get all done we can form the complementary probability:
P = 1 - F(M-1,N,365)/365**2
by accessing current_row[N]
The use of the Python decimal library makes most of the calculations easy but they are not very fast as N,M get large.
The values produced by this code match the table of calculations given below (at least up to 5 birthdays). Unfortunately, the code blows up on problems of 4 or more with:
*OverflowError: math range error* when tested under Python 3:
sys.version = 3.7.3 (default, Mar 27 2019, 17:13:21) [MSC v.1915 64 bit
(AMD64)]).
I tracked this down to an overflow in calculating 365**N
when N gets large. I fixed this by using the Decimal value of 365 and the built-in function pow()
so it works now. I confirmed the results against the table up to the cases for 5 of the same birthday and the results agree with the exception of the final digit for the case of three birthdays in a group of 87. The error is in the round-off of the final digit.
I think the original code was written in Python 2 (based on the print) but I don’t know if the original code ever worked for the more complex cases. The only test case shown was 23,2 which worked on Python 3 as well
Even though this is a direct calculation of the results, the run time starts to get appreciable for a large number of coincident birthdays. For 5 birthdays the run time is ~ 16 seconds. It is interesting to note that the Monte Carlo simulation of the same case is only ~12.5 seconds for 1e6 samples which is enough to demonstrate significance (Z~3).
Another Moral to the Story: sometimes Monte-Carlo is faster than direct calculation.
Table of some exact calculations
Exact Solutions of the Generalized Birthday Problem
Bruce Levin
Assume N people are in a room. What is the smallest N such that there is at least probability 0.5 that M people have the same birthday? Assume the birthday distribution is uniform over 365 days.
Assume X~Mult(N;P) on k=365 categories, with P=(1/365,…,1/365) and calculate Prob(M;N) = P[max X[i] is at least M] using the exact method of Levin, “A representation for multinomial cumulative distribution functions”, Annals of Statistics, 9:1123-1126 (1981).
M N Prob(M;N)
----- ----- ---------
1 1 1
1 0 0
2 23 0.507297234324
2 22 0.475695307663
3 88 0.511065110625
3 87 0.499454850632
4 187 0.502685373189
4 186 0.495825706383
5 313 0.501070475849
5 312 0.496195571644
6 460 0.50244941037
6 459 0.498637523705
7 623 0.502948948663
7 622 0.499795687887
8 798 0.500320275207
8 797 0.497616714463
9 985 0.500948416378
9 984 0.498568067031
10 1181 0.500931161057
10 1180 0.498796176416
11 1385 0.501001958747
11 1384 0.499059528126
12 1596 0.501166734721
12 1595 0.499379622274
13 1813 0.501104224633
13 1812 0.499445407288
14 2035 0.500348626509
14 2034 0.498798065243
15 2263 0.501295448239
15 2262 0.499836197505


WITNESS LIST Government Reform Committee February 26, 2003-8:30A Information Technology On: Barrett, Phil (Department of Information Resources-Texas Online) Dennis, David (Comptroller of Public Accounts) Ford, Ruthie (Comptroller of Public Accounts) Lanier, Dustin (Governor's Office) Purcell, Carolyn (Dept of Info Resources)


--- permalink: gallery/ layout: index title: Gallery show_call_to_action: false gallery_images: - title: The Bottle Room image_path: /assets/gallery/img-57.jpg - title: The Bottle Room image_path: /assets/gallery/img-56.jpg - title: The Bottle Room image_path: /assets/gallery/img-51.jpg - title: The Bottle Room image_path: /assets/gallery/img-48.jpg - title: The Bottle Room image_path: /assets/gallery/img-47.jpg - title: The Bottle Room image_path: /assets/gallery/img-54.jpg - title: The Bottle Room image_path: /assets/gallery/img-53.jpg - title: The Bottle Room image_path: /assets/gallery/img-50.jpg - title: The Bottle Room image_path: /assets/gallery/img-49.jpg - title: The Bottle Room image_path: /assets/gallery/img-52.jpg - title: The Bottle Room image_path: /assets/gallery/img-46.jpg - title: The Bottle Room image_path: /assets/gallery/img-45.jpg - title: The Bottle Room image_path: /assets/gallery/img-44.jpg - title: The Bottle Room image_path: /assets/gallery/img-43.jpg - title: The Bottle Room image_path: /assets/gallery/img-42.jpg - title: The Bottle Room image_path: /assets/gallery/img-41.jpg - title: The Bottle Room image_path: /assets/gallery/img-40.jpg - title: The Bottle Room image_path: /assets/gallery/img-58.jpg - title: The Bottle Room image_path: /assets/gallery/img-39.jpg - title: The Bottle Room image_path: /assets/gallery/img-38.jpg - title: The Bottle Room image_path: /assets/gallery/img-37.jpg - title: The Bottle Room image_path: /assets/gallery/img-36.jpg - title: The Bottle Room image_path: /assets/gallery/img-35.jpg - title: The Bottle Room image_path: /assets/gallery/img-34.jpg - title: The Bottle Room image_path: /assets/gallery/img-33.jpg - title: The Bottle Room image_path: /assets/gallery/img-32.jpg - title: The Bottle Room image_path: /assets/gallery/img-31.jpg - title: The Bottle Room image_path: /assets/gallery/img-55.jpg - title: The Bottle Room image_path: /assets/gallery/img-30.jpg - title: The Bottle Room image_path: /assets/gallery/img-29.jpg - title: The Bottle Room image_path: /assets/gallery/img-28.jpg - title: The Bottle Room image_path: /assets/gallery/img-27.jpg - title: The Bottle Room image_path: /assets/gallery/img-26.jpg - title: The Bottle Room image_path: /assets/gallery/img-25.jpg - title: The Bottle Room image_path: /assets/gallery/img-24.jpg - title: The Bottle Room image_path: /assets/gallery/img-23.jpg - title: The Bottle Room image_path: /assets/gallery/img-22.jpg - title: The Bottle Room image_path: /assets/gallery/img-21.jpg - title: The Bottle Room image_path: /assets/gallery/img-20.jpg - title: The Bottle Room image_path: /assets/gallery/img-19.jpg - title: The Bottle Room image_path: /assets/gallery/img-18.jpg - title: The Bottle Room image_path: /assets/gallery/img-17.jpg - title: The Bottle Room image_path: /assets/gallery/img-16.jpg - title: The Bottle Room image_path: /assets/gallery/img-15.jpg - title: The Bottle Room image_path: /assets/gallery/img-14.jpg - title: The Bottle Room image_path: /assets/gallery/img-13.jpg - title: The Bottle Room image_path: /assets/gallery/img-12.jpg - title: The Bottle Room image_path: /assets/gallery/img-11.jpg - title: The Bottle Room image_path: /assets/gallery/img-10.jpg - title: The Bottle Room image_path: /assets/gallery/img-09.jpg - title: The Bottle Room image_path: /assets/gallery/img-08.jpg - title: The Bottle Room image_path: /assets/gallery/img-07.jpg - title: The Bottle Room image_path: /assets/gallery/img-06.jpg - title: The Bottle Room image_path: /assets/gallery/img-05.jpg - title: The Bottle Room image_path: /assets/gallery/img-04.jpg - title: The Bottle Room image_path: /assets/gallery/img-03.jpg - title: The Bottle Room image_path: /assets/gallery/img-02.jpg - title: The Bottle Room image_path: /assets/gallery/img-01.jpg ---


--- title: The Problem with String Stored Regex layout: post tags: [lisp, rant] uuid: b821299d-d1f4-307c-4d93-d8a829b7e5c2 ---
While regular expressions have limited usefulness, especially in larger programs, they're still very handy to have from time to time. It's usually difficult to write a lexer or tokenizer without one. Because of this several languages build them right into the language itself, rather than tacked on as a library. It allows the regular expressions to be stored literally in the code, treated as its own type, rather than inside a string. The problem with storing a regular expression inside a string is that it can easily make an already complex regular expression much more complex. This is because there are two levels of parsing going on.
Consider this regular expression where we match an alphanumeric word inside of quotes. I'm going to use slashes to delimit the regular expression itself.
/"\w+"/
Notice there is no escaping going on. The backslash is there is
indicate a special sequence \w
, which is equal
to [a-zA-Z0-9_]
. This will
get parsed and
compiled into some form in memory before it is run by a
program. If the language doesn't directly support regular expressions
then we usually can't put it in the code as is, since the language
parser won't know how to deal with it. The solution is to store it
inside of a string.
However, our regular expression contains quotes and these will need to be escaped when in a quote delimited string. But I no longer need slashes to delimit my regular expression.
"\"\w+\""
Did you notice the error yet? If not, stop and think about it for a
minute. Our special sequence \w
will not make it intact
to the regular expression compiler. That backslash will escape
the w
during the string parsing step, leaving only
the w
. The string we typed will get parsed into a series
of characters in memory, performing escapes along the way, and
then that sequence will be handed to the regular expression
compiler. So we have to fix it,
"\"\\w+\""
That's getting hard to understand, compared to the original. Now let's throw a curve-ball into this: let's match a backslash at the beginning of the word. The normal regular expression looks like this now,
/"\\\w+"/
We have to escape our backslash to make it a literal backslash, so it takes two of them. Now, when we want to do this in a string-stored regular expression we have to escape both of those backslashes again. It looks like this,
"\"\\\\\\w+\""
Now to match a single backslash we have to insert four backslashes! Quite unfortunately, Emacs Lisp doesn't directly support regular expressions even though the language has a lot of emphasis on text parsing, so a lot of Elisp code is riddled with this sort of thing. Elisp is especially difficult because sometimes, such as during prompts, you can enter a regular expression directly and can ignore the layer of string parsing. It's a very conscious effort to remember which situation you're in at different times.
Perl, Ruby, and JavaScript have regular expressions as part of the
language and it makes a lot of sense for these languages; they tend to
do a lot of text parsing. Python does it partially, with
its r'
syntax. Any string preceded with an r
loses its escape rules, but it also means you can't match both single
or double quotes without falling back to a normal string with
escaping. Common Lisp may be able to do it with a
reader macro, but I've never seen it done.
Remember those two levels of parsing when writing string stored regex. It helps avoid hair-pulling annoying mistakes.


vector v1.0.0 Vector
A library of two- and three-dimensional vector operations. All vectors are represented as tuples with either two or three elements.
Examples
iex> # Vector Tripple Product Identity
...> a = {2, 3, 1}
...> b = {1, 4, -2}
...> c = {-1, 2, 1}
...> Vector.equal?(
...> Vector.cross(Vector.cross(a, b), c),
...> Vector.subtract(Vector.multiply(b, Vector.dot(a, c)), Vector.multiply(a, Vector.dot(b, c))))
true
Link to this section Summary
Functions
Adds two vectors
Returns the basis vector for the given axis
Returns the scalar component for the axis given
Returns the cross product of two vectors A⨯B
Returns the norm (magnitude) of the cross product of two vectors A⨯B
Divide a vector by scalar value s
Returns the dot product of two vectors A⨯B
Compares two vectors for euqality, with an optional tolerance
Multiply a vector by scalar value s
Returns the norm (magnitude) of a vector
Returns the square of the norm norm (magnitude) of a vector
Returns a new coordinate by projecting a given length distance
from
coordinate start
along vector
Reverses a vector
Subtract vector B from vector A. Equivalent to Vector.add(A, Vector.revers(B))
Returns the unit vector parallel ot the given vector.
This will raise an ArithmeticError
if a zero-magnitude vector is given.
Use unit_safe
if there is a chance that a zero-magnitude vector
will be sent
Returns the unit vector parallel ot the given vector, but will handle
the vectors {0, 0}
and {0, 0, 0}
by returning the same vector
Link to this section Types
Link to this section Functions
Adds two vectors
Examples
iex> Vector.add({3, -4}, {2, 1})
{5,-3}
iex> Vector.add({-2, 0, 5}, {0, 0, 0})
{-2, 0, 5}
iex> Vector.add({2, 1, -2}, Vector.reverse({2, 1, -2}))
{0, 0, 0}
Returns the basis vector for the given axis
Examples
iex> Vector.basis(:x)
{1, 0, 0}
iex> Vector.basis(:y)
{0, 1, 0}
iex> Vector.component(Vector.basis(:y), :y)
1
Returns the scalar component for the axis given
Examples
iex> Vector.component({3, -4}, :y)
-4
iex> Vector.component({-6, 0, 8}, :z)
8
iex> Vector.component({1, -2}, :z)
0
iex> Vector.component(Vector.basis(:x), :z)
0
Returns the cross product of two vectors A⨯B
Examples
iex> Vector.cross({2, 3}, {1, 4})
{0, 0, 5}
iex> Vector.cross({2, 2, -1}, {1, 4, 2})
{8, -5, 6}
iex> Vector.cross({3, -3, 1}, {4, 9, 2})
{-15, -2, 39}
Returns the norm (magnitude) of the cross product of two vectors A⨯B
Examples
iex> Vector.cross_norm({2, 3}, {1, 4})
5
iex> Vector.cross_norm({1, 4}, {2, 2})
6
iex> Vector.cross_norm({2, 0, -1}, {0, 3, 3})
9.0
iex> Float.floor(:math.pow(Vector.cross_norm({2, 2, -1}, {1, 4, 2}), 2))
125.0
Divide a vector by scalar value s
Examples
iex> Vector.divide({3, -4}, 2.5)
{1.2, -1.6}
iex> Vector.divide({-2, 0, 5}, -2)
{1.0, 0.0, -2.5}
Returns the dot product of two vectors A⨯B
Examples
iex> Vector.dot({2, 3}, {1, 4})
14
iex> Vector.dot({1, 4}, {2, 2})
10
iex> Vector.dot({2, 0, -1}, {0, 3, 3})
-3
Compares two vectors for euqality, with an optional tolerance
Examples
iex> Vector.equal?({3, -4}, {3, -4})
true
iex> Vector.equal?({3, -4}, {3.0001, -3.9999})
false
iex> Vector.equal?({3, -4}, {3.0001, -3.9999}, 0.001)
true
iex> Vector.equal?({3, -4, 1}, {3.0001, -3.9999, 1.0}, 0.001)
true
Multiply a vector by scalar value s
Examples
iex> Vector.multiply({3, -4}, 2.5)
{7.5, -10.0}
iex> Vector.multiply({-2, 0, 5}, -2)
{4, 0, -10}
Returns the norm (magnitude) of a vector
Examples
iex> Vector.norm({3, 4})
5.0
iex> Vector.norm({-1, 0})
1
iex> Vector.norm({0, -2, 0})
2
Returns the square of the norm norm (magnitude) of a vector
Examples
iex> Vector.norm_squared({3, 4})
25
iex> Vector.norm_squared({1, 0})
1
iex> Vector.norm_squared({2, 0, -1})
5
iex> Vector.norm_squared({-2, 3, 1})
14
Returns a new coordinate by projecting a given length distance
from
coordinate start
along vector
Examples
iex> Vector.project({3, -4}, {-1, 1}, 4)
{1.4, -2.2}
iex> Vector.project({-6, 0, 8}, {1, -2, 0.4}, 2.5)
{-0.5, -2.0, 2.4}
iex> Vector.project({-2, 1, 3}, {0, 0, 0}, 2.5) |> Vector.norm()
2.5
Reverses a vector
Examples
iex> Vector.reverse({3, -4})
{-3, 4}
iex> Vector.reverse({-2, 0, 5})
{2, 0, -5}
iex> Vector.cross_norm({-2, 3, 5}, Vector.reverse({-2, 3, 5}))
0
Subtract vector B from vector A. Equivalent to Vector.add(A, Vector.revers(B))
Examples
iex> Vector.subtract({3, -4}, {2, 1})
{1,-5}
iex> Vector.subtract({-2, 0, 5}, {-3, 1, 2})
{1, -1, 3}
Returns the unit vector parallel ot the given vector.
This will raise an ArithmeticError
if a zero-magnitude vector is given.
Use unit_safe
if there is a chance that a zero-magnitude vector
will be sent.
Examples
iex> Vector.unit({3, 4})
{0.6, 0.8}
iex> Vector.unit({8, 0, 6})
{0.8, 0.0, 0.6}
iex> Vector.unit({-2, 0, 0})
{-1.0, 0.0, 0.0}
iex> Vector.unit({0, 0, 0})
** (ArithmeticError) bad argument in arithmetic expression


Most documents on the web are written in HTML language.
URL The URL is effectively the adress to navigate to a document on the web. HTTPHTTP is the protocol of communication between browsers and servers on the web.
TagsDifferent tags are used to structure a HTML document, as described here.
One needs to distinguish between
inline elements , such as this image:
or a block element such as this paragraph
PARAGRAPH I


{% include 'head.html' { page: "index" }%}
I started this project for Inktober 2016. I'd been learning brush lettering for a while, and I painted a series of pop-culture phrases from things that I love. They're mostly watercolor on paper, with some digital processing to clean up blemishes.
Here are a few of my favorites.
If you liked this project, check out my Instagram for more stuff like this!


--- layout: index title: Posts permalink: /posts/ weight: 2 title: Posts description: Tips for geospatial stuff such as Geoinformation, Remote Sensing, Geomatics, and a bit of spatial programming (mostly python and R). --- {% include menu.html %}


{{ name.title() }}'s Profile.
Your estimated credit score is
{{ credit }}
.
Lender
Amount
Interest Rate
{% for lender in lenders %}
{{ lender.title() }}
$2
0.5%
{% endfor %}


One of my favorite hobbies is cooking. I love to try new cuisines. I have seen a lot of different cuisine websites.  I think these type of websites helps students, bachelors and women. When I came to USA I don't have more experience in cooking at that time these type of website help me a lot, but now I have a lot experience related to cooking and even I can prepare delicious food. This is the reason why I want to create this type of website.
©Cooking Website, 2017. All rights reserved


Chelsea gets Nov 20 court date for FIFA transfer ban appeal
LAUSANNE, Switzerland (AP) - Chelsea’s appeal against a transfer ban by FIFA for breaking rules to sign youth players from abroad will be heard on Nov. 20 at the Court of Arbitration for Sport.
CAS has announced the hearing date on Monday, with a verdict due before the midseason transfer window opens in January.
Chelsea already served half of its one-year ban on registering new players during the offseason trading period.
The club did not seek to freeze the FIFA sanction while preparing the appeal to CAS.
FIFA’s disciplinary and appeal committees have said Chelsea violated 150 rules protecting minors from trafficking. Those cases involved about 70 players.
Chelsea was also judged to break rules prohibiting third-party influence on players. FIFA imposed a fine of 600,000 Swiss francs ($608,000).
The club has denied wrongdoing.
More AP soccer: https://apnews.com/Soccer and https://twitter.com/AP_Sports
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WITNESS LIST Appropriations-S/C on General Government Committee February 9, 2005-7:00A Budget Against: Armstrong Hixon, Sarita (San Jacinto Museum of History Association) Baer, PE, Therese M. (Texas On-Site Wastewater Treatment Research Council) Culver, Anne (Greater Houston Partnership and Texas Clean Air Working Group) Langford, David K. (Self and Texas Wildlife Association) Massey, Michael (Texas Recreation and Parks Society) Reed, Cyrus (Lone Star Chapter of Sierra Club) Williams, C E (Self and Panhandle Groundwater District) On: Anderson, Sparky (Texas Black Bass Unlimited and Sensible Management of Aquatic Resources Team (SMART)) Carrillo, Commissioner Victor G. (Railroad Commission of Texas) Combs, Susan (Texas Department of Agriculture) Cook, Robert L. (Texas Parks and Wildlife) Crumley, W.T. "Dub" (State Soil and Water Conservation Board) Flores, Linda (TCEQ) Hillman, DVM, Bob (Texas Animal Health Commission) Hudson, Denise (Texas Department of Agriculture) Isom, Rex (Texas Soil and Water Conservation Board) Kitchens, Ronald (Railroad Commission of Texas) LeBas, James (Texas Water Development Board) Patterson, Jerry (GLO) Perez, Ed (Texas Office of State- Federal Relations) Pittman, Rod (Texas Water Development Board) Pyka, Kathy (Railroad Commission) Shankle, Glenn (TCEQ) Thigpen, Drew (Texas Parks and Wildlife Department) Traylor, Richard (Texas Animal Health Commission) Ward, J. Kevin (Texas Water Development Board)


Visit Using JSP templates to encapsulate Webpage layout and encourage modular design by David Geary to learn more about JSP templates.


DEBATE: Will Uber's move into banking succeed or fail?
by Andrew MitchellCan Uber graduate from taxi rank to taxi bank after announcing its move into financial services?
YES, says Andrew Mitchell, vice president at JCB.
Uber’s drivers are its bedrock. And growing driver service and revenue options without earth-shattering outlays is shrewd indeed.
As such, Uber Money is a logical step to maximise its digital-lifestyle standing among its driver base.
With experienced shareholders and sophisticated account-based app services, Uber already has key ingredients to be that taxi bank for its drivers via its increased control of banking rails and provision of instant fund availability. Additionally, by going all-in for digital cards and wallets, Uber will increase its consumer loyalty and revenue-generation from riders.
Uber’s previous forays into debit and overdraft services wedded with its form for rapid adjustment should encourage confidence in the solidity of this new venture.
As Uber’s head of payments intimated, best value is the end game, so we can expect Uber Money services to snowball quicker than a taxi on the Autobahn.
NO, says Jim Prior is global chief executive of WPP brand agency Superunion.
Uber Money is the latest in a string of moves by Uber that attempts to embed the brand in every element of the lives of consumers.
But banking is a very different proposition to the other components of its offer, and an Uber bank is destined to fail.
All those surveys that you see which claim people don’t trust banks – ignore them, they are wrong. Deep-rooted trust from customers is a basic requirement for any successful bank, and Uber is a long, long way from having that.
While it’s true that several fintech challenger banks have brought some likeable design and functionality to the market, they are yet to make a profit and have failed to disrupt financial services to any profound extent. They are interesting supplements to established banks, but not substitutes for them.
So for Uber Money, expect an interesting yet profitless flirtation, undermined as a sustainable business by a lack of fundamental trust.
Main image credit: Uber


LESSON 5 - EXERCISE 3:
Now you will be able to login to Facebook using Labapp
Login:
Login
Get login
Log Out:
Logout
You are not near the shoes aisle!
You are not near the sports aisle!
You are not near the movies aisle!
Current Aisle : shop-default


{{ define "main" }} {{ partial "jumbotron" (dict "image" "/img/guzheng-styles.jpg" "title" "Reviews" "image_credit" "Caption here" ) }}
The goal of these reviews is to help the community decide what they want to buy. Each review is based on my time with the actual items. I do my best to be objective but, ultimately, these reviews should be considered the personal opinion of just one person. If there are parts that I miss or details you think I should call out, please feel free to email me with suggestions.
Most of these products can be purchased from online retailers such as Ebay, Amazon, Alibaba, and Taobao. Links are provided to the original producer of the items when possible. There is no financial connection between Guzheng Alive and any of these companies or sellers, nor does clicking on links provide Guzheng Alive with any money. This is all just for the community’s information.
Have any products you would like me to review? Send me requests through the email form at the bottom of the page!


The best throw of Dwayne Haskins' young NFL career was negated by a holding call, Business Insider - Business Insider Singapore
by Scott Davis, Business Insider US- Washington Redskins rookie quarterback Dwayne Haskins made an impressive, scrambling, 67-yard throw to receiver Terry McLaurin.
- The play, which would have been the best of Haskins’ young career, was called back because of holding.
- The Redskins ended up punting three plays later.
- Visit Business Insider’s homepage for more stories.
Dwayne Haskins made the best throw of his young career on Sunday, but it didn’t even count.
In the second quarter, Haskins, making his second career start, got flushed from the pocket by the New York Jets. While on the run, Haskins tossed a floating, 67-yard bomb to rookie wide receiver Terry McLaurin, who made the catch and took it an additional 15 yards or so.
Unfortunately, the play got called back because of a holding penalty on the Washington Redskins.
Washington ran three more plays, didn’t get a first down and punted.
- Read more:
- The NFL’s pass interference rules continue to baffle as a seemingly obvious grab prevented a Texans touchdown and didn’t get overturned
- Colin Kaepernick put the ball in NFL teams’ court after an impressive and complicated workout
- The NFL has never seen anything like the ugly fight between the Browns and the Steelers, and blame is flying in all directions
- NFL POWER RANKINGS: Where every team stands heading into Week 11


DRMC received an email notification from the client and contact statistician for the client screening confirmation.
Read more Step 2The screening process will be done by the statistician and they will inform DRMC staff the selected applicant/ client
Read more Step 4DRMC staff contact client to schedule the appointment after received confirmation from the statistician. Once confirmed the client need to upload and fill up payment form.
Read more Step 5The payment form need to be completed by client and endorsed by statistician during the clinic appointment which will be held at Statistic Room at 8th Floor, MPP Building.DRMC obtain payment form and payment supporting document/ receipt from the client and process transfer of fund to Faculty account
Payment Form Step 6Thank you for using our services
Feb 26


Myeongdong in Manila
by Manila Standard LifestyleFor beauty junkies, especially K-beauty fans, a trip to Korea is definitely incomplete without a quick visit—at least two hours—to its shopping district, Myeongdong.
The bustling shopping area in Seoul is home to a number of fashion, skincare, and cosmetics brands, from mid-range to premium.
Leading department store The SM Store brings a piece of Myeongdong to its beauty section, offering a wide range of Korean beauty brands carefully curated at its K-Beauty zones.
Skincare brands include CosRx, Dear Klairs, Neogen, Mediheal, Leaders, Banila Co, AHC, Esfolio, The Saem, Dewytree, Face Republic, iWhite, Seoul White, Luxe Organix, Fresh, Bling Pop, Jayjun, and SNP.
K-beauty cosmetics brands abound, with choices including BLK (Korean line), Yadah, Club Clio, Peripera, and Vice BT21 line.
“SM Beauty’s K-Beauty Playground is a wonderful place to discover, experience, and play with Korean beauty products to help achieve the signature doll-like makeup and glowing hydrated skin,” said Watsons and SM Beauty customer director Viki Encarnacion.
She added, “We are glad to be the preferred destination of K-beauty lovers in the Philippines. There’s going to be a lot more brands that we will bring in in the coming days for our customers to try.”


|
Elma
An event loop manager for embedded systems
|
User Datagram Protocol(UDP) is used in internet applications to implement low-latency and loss-tolerating commenction. UDP enalbles a process to process communication. This project aims to implement a bidirectional UDP message transferring mechanism between a UDP client and a UDP Server.
This project is a UDP based iOT application that comprises of a Thermostat(UDP Server) and a Room Heater (UDP client). The thermostat and the heater communicate to each other via UDP. There is also an internal manager in heater side that controls the heater, that is turn the heater on or off. The Thermostat can send the current temperature value to the heater in JSON format. The Thermostat listens to a predefined port for the messages from the Heater.
Heater is a finite state machine that has an on state and an off state. It is initially set to an off state. The internal Manager sends a message to turn on the heater. If the heater is on, it requests for a temperature value from the thermostat. Thermostat then sends back the requested temperature value.
The source code for Elma is on Github.
You can build the docker environment, described in env/Dockerfile, yourself, with the following commands:
``` git clone https://github.com/mahimasunny/FinalProject.git cd FinalProject docker build -t myelma . docker run -v $PWD:/source -it myelma bash make ./examples/bin/heater ./examples/bin/thermostat ```
The following are the steps I followed for the completion of this project.
Socket creation ``` #include <sys/socket.h>
...
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { perror("cannot create socket"); return 0; }
``` where, sockfd is the socket descripton, domain refers to communication domain for example AF_INET (IPv4 protocol) , AF_INET6 (IPv6 protocol), type is SOCK_DGRAM for UDP and protocol value is the value for Internet Protocol which is 0. Here all the input parameters are integers. socket mehod is defined in sys/socket.h.
Identify a socket Sockets are assigned port numbers or transport addresses.
In server side ``` struct sockaddr_in myaddr;
/* bind to an arbitrary return address */ /* because this is the client side, we don't care about the address */ /* since no application will initiate communication here - it will */ /* just send responses */ /* INADDR_ANY is the IP address and 0 is the socket */ /* htonl converts a long integer (e.g. address) to a network representation */ /* htons converts a short integer (e.g. port) to a network representation */
memset((char *)&myaddr, 0, sizeof(myaddr)); myaddr.sin_family = AF_INET; myaddr.sin_addr.s_addr = htonl(INADDR_ANY); myaddr.sin_port = htons(PORT);
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) { perror("bind failed"); return 0; } ``` In the server side, Bind method forcefully binds the PORT address.
Client side: send message to the PORT to which binding was done at the server side. ``` memset((char *)&myaddr, 0, sizeof(myaddr)); myaddr.sin_family = AF_INET; myaddr.sin_addr.s_addr = htonl(INADDR_ANY); myaddr.sin_port = htons(0); ```
Send message to a server from a client a. Client side sendto is used to send a message from client to server
``` sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&remaddr, slen); ``` fd refers to the name of the socket. my_message, provides the starting address of the message we want to send. The flags parameter is 0 for UDP sockets. The remaddr defines the destination address and port number for the message. socklen_t is the length of the address structure: sizeof(struct sockaddr_in).
b. Receive message at server ``` /* now loop, receiving data and printing what we received */ for (;;) { printf("waiting on port %d\n", PORT); recvlen = recvfrom(fd, buf, BUFSIZE, 0, (struct sockaddr *)&remaddr, &addrlen); printf("received %d bytes\n", recvlen); if (recvlen > 0) { buf[recvlen] = 0; printf("received message: \"s"
", buf); } } /* never exits */
``` fd refers to the name of the socket. buf is the input data and recvlen is the length of that data The flags parameter is 0 for UDP sockets. remaddr is used to recognize the sender.
On the client, send a message
Message from client to server ``` recvlen = recvfrom(s, buf, BUFSIZE, 0, (struct sockaddr *)&remaddr, &addrlen); ```
Reply from server to client send to remaddr ``` sendto(s, buf, strlen(buf), 0, (struct sockaddr *)&remaddr, addrlen)
```
At this stage the client can also send back a message to the server
Close the socket Eventhough there is no communication to be terminated in UDP, the system needs to be closed to free up memory. ``` close(fd);
``` fd refers to the file descriptor
Libraries Elma C++ libararies such as iostream, json/json.h, map, string sys/socket.h netdb.h arpa/inet.h
Other References https://www.cs.rutgers.edu/~pxk/417/notes/sockets/udp.html https://www.geeksforgeeks.org/socket-programming-cc/ https://pubs.opengroup.org/onlinepubs/7908799/xns/syssocket.h.html


Drinks
"Always do sober what you said you'd do drunk.
"Always do sober what you said you'd do drunk.
“It is health that is real wealth, not pieces of gold and silver."
"It is difficult to get organic food at most restaurants, so when possible, eat at home. When not, visit us."
"Let's 'meat' at a nice restaurant"
"Most seafoods should be simply threatened with heat and then celebrated with joy."
"It's all about the spice."
lirimhajrizi7@gmail.com


Telling a story with the data is a journey that usually doesn't start with you. The data must come from somewhere. Getting that data into a place that is usable by you takes effort that is likely out of your scope, especially in consideration of the enterprise.
Today's applications and projects can be large and intricate, often involving the use of skills and knowledge from numerous individuals. Each person brings a unique talent and expertise, sharing in the effort of working together and coordinating tasks and responsibilities to see a project through from concept to production.
In the recent past, roles such as business analysts and business intelligence developers were the standard for data processing and understanding. However, excessive expansion of the size and different types of data has caused these roles to evolve into more specialized sets of skills that modernize and streamline the processes of data engineering and analysis.
The following sections highlight these different roles in data and the specific responsibility in the overall spectrum of data discovery and understanding:
Business analyst
Data analyst
Data engineer
Data scientist
Database administrator
While some similarities exist between a data analyst and business analyst, the key differentiator between the two roles is what they do with data. A business analyst is closer to the business and is a specialist in interpreting the data that comes from the visualization. Often, the roles of data analyst and business analyst could be the responsibility of a single person.
A data analyst enables businesses to maximize the value of their data assets through visualization and reporting tools such as Microsoft Power BI. Data analysts are responsible for profiling, cleaning, and transforming data. Their responsibilities also include designing and building scalable and effective data models, and enabling and implementing the advanced analytics capabilities into reports for analysis. A data analyst works with the pertinent stakeholders to identify appropriate and necessary data and reporting requirements, and then they are tasked with turning raw data into relevant and meaningful insights.
A data analyst is also responsible for the management of Power BI assets, including reports, dashboards, workspaces, and the underlying datasets that are used in the reports. They are tasked with implementing and configuring proper security procedures, in conjunction with stakeholder requirements, to ensure the safekeeping of all Power BI assets and their data.
Data analysts work with data engineers to determine and locate appropriate data sources that meet stakeholder requirements. Additionally, data analysts work with the data engineer and database administrator to ensure that the analyst has proper access to the needed data sources. The data analyst also works with the data engineer to identify new processes or improve existing processes for collecting data for analysis.
Data engineers provision and set up data platform technologies that are on-premises and in the cloud. They manage and secure the flow of structured and unstructured data from multiple sources. The data platforms that they use can include relational databases, nonrelational databases, data streams, and file stores. Data engineers also ensure that data services securely and seamlessly integrate across data services.
Primary responsibilities of data engineers include the use of on-premises and cloud data services and tools to ingest, egress, and transform data from multiple sources. Data engineers collaborate with business stakeholders to identify and meet data requirements. They design and implement solutions.
While some alignment might exist in the tasks and responsibilities of a data engineer and a database administrator, a data engineer's scope of work goes well beyond looking after a database and the server where it's hosted and likely doesn't include the overall operational data management.
A data engineer adds tremendous value to business intelligence and data science projects. When the data engineer brings data together, often described as data wrangling, projects move faster because data scientists can focus on their own areas of work.
As a data analyst, you would work closely with a data engineer in making sure that you can access the variety of structured and unstructured data sources because they will support you in optimizing data models, which are typically served from a modern data warehouse or data lake.
Both database administrators and business intelligence professionals can transition to a data engineer role; they need to learn the tools and technology that are used to process large amounts of data.
Data scientists perform advanced analytics to extract value from data. Their work can vary from descriptive analytics to predictive analytics. Descriptive analytics evaluate data through a process known as exploratory data analysis (EDA). Predictive analytics are used in machine learning to apply modeling techniques that can detect anomalies or patterns. These analytics are important parts of forecast models.
Descriptive and predictive analytics are only partial aspects of data scientists' work. Some data scientists might work in the realm of deep learning, performing iterative experiments to solve a complex data problem by using customized algorithms.
Anecdotal evidence suggests that most of the work in a data science project is spent on data wrangling and feature engineering. Data scientists can speed up the experimentation process when data engineers use their skills to successfully wrangle data.
On the surface, it might seem that a data scientist and data analyst are far apart in the work that they do, but this conjecture is untrue. A data scientist looks at data to determine the questions that need answers and will often devise a hypothesis or an experiment and then turn to the data analyst to assist with the data visualization and reporting.
A database administrator implements and manages the operational aspects of cloud-native and hybrid data platform solutions that are built on Microsoft Azure data services and Microsoft SQL Server. A data administrator is responsible for the overall availability and consistent performance and optimizations of the database solutions. They work with stakeholders to identify and implement the policies, tools, and processes for data backup and recovery plans.
The role of a database administrator is different from the role of a data engineer. A database administrator monitors and manages the overall health of a database and the hardware that it resides on, whereas a data engineer is involved in the process of data wrangling, in other words, ingesting, transforming, validating, and cleaning data to meet business needs and requirements.
The database administrator is also responsible for managing the overall security of the data, granting and restricting user access and privileges to the data as determined by business needs and requirements.


AWS::QLDB::Ledger
The AWS::QLDB::Ledger
resource specifies a new Amazon Quantum Ledger Database
(Amazon QLDB) ledger in your AWS account.  You can use QLDB to track all application data
changes, and maintain a complete and verifiable history of changes over time.
For more information, see CreateLedger in the Amazon QLDB API Reference.
Syntax
To declare this entity in your AWS CloudFormation template, use the following syntax:
JSON
{ "Type" : "AWS::QLDB::Ledger", "Properties" : { "DeletionProtection" :
Boolean
, "KmsKey" :String
, "Name" :String
, "PermissionsMode" :String
, "Tags" :[ Tag, ... ]
} }
YAML
Type: AWS::QLDB::Ledger Properties: DeletionProtection:
Boolean
KmsKey:String
Name:String
PermissionsMode:String
Tags:- Tag
Properties
DeletionProtection
-
Specifies whether the ledger is protected from being deleted by any user. If not defined during ledger creation, this feature is enabled (
true
) by default.If deletion protection is enabled, you must first disable it before you can delete the ledger. You can disable it by calling the
UpdateLedger
operation to set this parameter tofalse
.Required: No
Type: Boolean
Update requires: No interruption
KmsKey
-
The key in AWS Key Management Service (AWS KMS) to use for encryption of data at rest in the ledger. For more information, see Encryption at rest in the Amazon QLDB Developer Guide.
Use one of the following options to specify this parameter:
-
AWS_OWNED_KMS_KEY
: Use an AWS KMS key that is owned and managed by AWS on your behalf. -
Undefined: By default, use an AWS owned KMS key.

Amazon QLDB does not support asymmetric keys. For more information, see Using symmetric and asymmetric keys in the AWS Key Management Service Developer Guide.
To specify a customer managed KMS key, you can use its key ID, Amazon Resource Name (ARN), alias name, or alias ARN. When using an alias name, prefix it with
"alias/"
. To specify a key in a different AWS account, you must use the key ARN or alias ARN.For example:
-
Key ID:
1234abcd-12ab-34cd-56ef-1234567890ab
-
Key ARN:
arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab
-
Alias name:
alias/ExampleAlias
-
Alias ARN:
arn:aws:kms:us-east-2:111122223333:alias/ExampleAlias
For more information, see Key identifiers (KeyId) in the AWS Key Management Service Developer Guide.
Required: No
Type: String
Maximum:
1600
Update requires: No interruption
-
Name
-
The name of the ledger that you want to create. The name must be unique among all of the ledgers in your AWS account in the current Region.
Naming constraints for ledger names are defined in Quotas in Amazon QLDB in the Amazon QLDB Developer Guide.
Required: No
Type: String
Minimum:
1
Maximum:
32
Pattern:
(?!^.*--)(?!^[0-9]+$)(?!^-)(?!.*-$)^[A-Za-z0-9-]+$
Update requires: Replacement
PermissionsMode
-
The permissions mode to assign to the ledger that you want to create. This parameter can have one of the following values:
-
ALLOW_ALL
: A legacy permissions mode that enables access control with API-level granularity for ledgers.This mode allows users who have the
SendCommand
API permission for this ledger to run all PartiQL commands (hence,ALLOW_ALL
) on any tables in the specified ledger. This mode disregards any table-level or command-level IAM permissions policies that you create for the ledger. -
STANDARD
: (Recommended) A permissions mode that enables access control with finer granularity for ledgers, tables, and PartiQL commands.By default, this mode denies all user requests to run any PartiQL commands on any tables in this ledger. To allow PartiQL commands to run, you must create IAM permissions policies for specific table resources and PartiQL actions, in addition to the
SendCommand
API permission for the ledger. For information, see Getting started with the standard permissions mode in the Amazon QLDB Developer Guide.
Note We strongly recommend using the
STANDARD
permissions mode to maximize the security of your ledger data.Required: Yes
Type: String
Allowed values:
ALLOW_ALL | STANDARD
Update requires: No interruption
-
Tags
-
An array of key-value pairs to apply to this resource.
For more information, see Tag.
Required: No
Type: List of Tag
Update requires: No interruption
Return values
Ref
When you pass the logical ID of this resource to the intrinsic Ref
function, Ref
returns the resource name. For example:
{ "Ref": "
myQLDBLedger
" }
For the resource with the logical ID myQLDBLedger
, Ref
returns
the Amazon QLDB ledger name.
For more information about using the Ref
function, see Ref.
Examples
Amazon QLDB Ledger
The following example describes an Amazon QLDB ledger with a
PermissionsMode
of STANDARD
and a specified customer managed KMS key for encryption at rest.
JSON
{ "AWSTemplateFormatVersion" : "2010-09-09", "Resources" : { "myQLDBLedger": { "Type": "AWS::QLDB::Ledger", "Properties": { "DeletionProtection": true, "KmsKey": "arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab", "Name": "exampleLedger", "PermissionsMode": "STANDARD", "Tags": [ { "Key": "Domain", "Value": "Test" } ] } } } }
YAML
AWSTemplateFormatVersion: "2010-09-09" Resources: myQLDBLedger: Type: "AWS::QLDB::Ledger" Properties: DeletionProtection: true KmsKey: "arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab" Name: "exampleLedger" PermissionsMode: "STANDARD" Tags: - Key: Domain Value: Test
See also
-
CreateLedger in the Amazon QLDB API Reference


{% extends 'base.html' %} {% load invoice_tags %} {% block title %}Company List{% endblock %} {% block main %}
| Company Name | Company Email | Total Invoices | Latest Invoice | Actions |
|---|---|---|---|---|
| {{ company.name }} | {{ company.email }} | {% total_invoices_user company user %} | {% latest_invoice_user company user as latest %} {% url 'invoice_detail' latest.pk as latest_invoice_url %} {% if latest_invoice_url %} {{ latest.invoice_number }} {% else %} - {% endif %} | visibility edit |
So many companies to look at. Maybe create one. |


Grapheme-to-phoneme conversion
Using the
Phonetisaurus
toolkit
Enter a list of words (one per line) below and click "Convert":
Convert
Undo


Defining
XML Serializable Objects Using Macros
(unedited)
Aliaksei Sanko - 10/01/2004
The
prototype presented allows defining XML serializable objects using
macros in an attributes-like manner.
Binding
Business Objects to WinForms
Eduard Liebenberger -
10/01/2004
Simplify the creation of a user interface for
business objects while providing a consistent mechanism for handling
IsDirty and IsValid in the UI.
CodeGuru
Update eNewsletter - September 28th, 2004
Bradley L. Jones
- 09/30/2004
Catch up on the latest from CodeGuru.
Create
a Shaped 3D Control with GDI+
Paul Kimmel -
09/30/2004
Want to create non-rectilinear controls for custom
Windows software development? Learn how to convert a custom
three-dimensional shape primitive into a shaped control with .NET
and GDI+.
How
to Secure Your Assemblies
darwen - 09/30/2004
What
is really stopping people from using any .NET assemblies you've
created?
ASP.NET
2.0's Sophisticated Site Navigation
Features
<EMAIL_ADDRESS>- 09/30/2004
ASP.NET
2.0 provides excellent site-navigation features for storing and
displaying site-navigation data in your Web applications. Learn how
to leverage them in your Web development.
(See all Latest
Articles)
|
|
|
|
CodeGuru is all
about sharing. If you have some unique code or an article,
we'd love to hear from you. Please read the Submission
Guidelines to see how to submit. We are always
after great new articles to post! |
|
|
|
|
Controlling
Project and File Properties with C++ Macros
Kate Gregory -
06/16/2004
Examine a C++ macro that changes a file (within a
managed project) from managed (/clr) to unmanaged—a task you may
need it to perform for performance reasons, creating a mixed
executable.
Using
Lists and Collections in .NET
Mark Strawmyer -
09/03/2004
The .NET Framework provides native support for
lists and collections. Learn the concept behind these classes and
why they are especially important with the planned inclusion of
generics in version 2.0 of the .NET Framework.
Create
a Shaped 3D Control with GDI+
Paul Kimmel -
09/30/2004
Want to create non-rectilinear controls for custom
Windows software development? Learn how to convert a custom
three-dimensional shape primitive into a shaped control with .NET
and GDI+.
Working
With Asynchronous .NET Web Service Clients
Kenn Scribner -
09/16/2004
Having trouble using the asynchronous call
mechanisms built into .NET? Let Kenn Scribner clarify it for you and
make your programming tasks (at least as related to asynchronous
processing) a little easier.
Nine
Years Later — The Next Major Release of Java
Sun Microsystems
released J2SE 5.0 (previously known as 'Tiger') today!
CodeGuru
Update eNewsletter - September 28th, 2004
Catch up on the
latest from CodeGuru.
CodeGuru
Update eNewsletter - September 21, 2004
Check out the latest
winners of the CodeGuru Goodies book and get information on the
lastest postings form the site.
Winnners
of the CodeGuru.com Visual C++ Goodies Book
See the latest
winners of the CodeGuru.com Goodies book.
(See all
Announcements)
Currently
in the News...
The following are current developer-related
stories from InternetNews.com :
Red
Hat Takes Netscape Enterprise
Tackling
the RSS Bandwidth Bugbear
New
Standard Java Spec Emerges
|
Topic |
By |
Replies |
Updated |
| MFC
to Windows APPlication |
arulnayagam |
1 |
October 4th, 03:43
AM |
| Problem
with DialogBar |
DrOetker |
5 |
October 4th, 03:42
AM |
| To
Get the Emulator DeskTopWindow and Tv
DeskTop |
S.DARWIN |
0 |
October 4th, 03:39
AM |
| SDI/MDI/Dialog-based |
micknustiunimik |
1 |
October 4th, 03:37
AM |
| Networking
Host/Client Questions |
Demonpants Software |
2 |
October 4th, 03:26
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cilu |
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from dialog without controls |
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connection |
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Items in a Combo Box |
deepakgupta007 |
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to Char conversion involving Unicode
characters |
suhaib |
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I’m a Full Stack Developer with 8 years of experience. I acquired some knowledge in different area which allow me to better understand things to go even further. I always want to learn more, that’s why I created this blog in order to share my knowledge.


General support queries. User Guides: https://support.komodoplatform.com/ Support staff: Angelina#6231 gcharang#6833. If you want to ask JL777 a question, use the #ask-jl777 channel.
100 messages
Before 05-Dec-19 12:00 AM
peepypoopy30-Sep-19 05:43 AM
@Oszy that doesn’t make sense if I entered a different word in the seed and got a different wallet that would mean I could theoretically access someone else’s wallet by entering a different word in the seed. That’s not secure
Oszy30-Sep-19 05:53 AM
Chances that someone has the same seed with only 1 word different from yours are very very slim nearly impossible
Are you typing your seed in or copy/pasting?
@![HATCH] Hatch I believe you won't be able to avoid listing fee just by writing here. guys from AtomicDEX here are the same guys
peepypoopy30-Sep-19 05:57 AM
@Oszy I would hope so, I am doing both
Oszy30-Sep-19 05:58 AM
@![HATCH] Hatch Although you can add your coin yourself to the marketmaker2 platform for free if you have electrum servers and other requirements met. Nothing is free but the cost if very far from what exchanges are asking.
@peepypoopy I can only repeat myself, if you see a different address, then you have some extra whitespace or character somewhere, missing/wrong word
![HATCH] Hatch30-Sep-19 06:03 AM
@Oszy Thank you. Yes, we have already created a Pull Reqest to add a HATCH coin to electrum, but it has not yet been accepted. If anything changes please let us know.
Oszy30-Sep-19 06:05 AM
@![HATCH] Hatch wait for response from the official Komodo team, I am no part of it, just here to answer general questions
coin parameters and all files needed for GUI support - jl777/coins
1
There is some work involved with listing, and the price is far less than most alternatives. There are also infrastructure costs (i.e. if you are not running your own electrum servers), so it is not unreasonable to expect fee for service and servers.
Once you have electrum servers up, the next step would be confirming mm2 compatibility by doing a test swap in CLI, and submitting a PR of the resulting transactions here - https://github.com/jl777/coins/tree/master/swaps
coin parameters and all files needed for GUI support - jl777/coins
Once thats done, you can do atomic swaps with anyone who activates your coin via mm2 in command line. Listing on apps using mm2 like hyperDEX or atomicDEX is another step, and would more likely than not involve some listing fee. You can always use mm2 to build your own app tho, and list whatever you'd like.
Personally, I've done work on a TUI which allows me to trade mm2 compatible coins like LABS which are not yet on atomicDEX (with others whom have activated LABS etc via the TUI or thier own scripts). Repo is on git, and listing is DIY
NOTE: It is highly recommended to backup your wallet.dat, private keys and wallet seed to have m...
youre best bet is to test seed variations via the tool in img below
peepypoopy30-Sep-19 07:08 AM
@Oszy okay I really need to talk to admin/support. I am able to access my old agama wallet and see my address but because of the security breach/hack incident it tells me to switch to another server. I have an updated agama wallet which as I says has a different address and therefore does not have my tokens. It is a different pin on the two different wallets, can I somehow enter my old pin into the new agama wallet, help please, this has only happened since the agama wallet hack, before that I was able to access my tokens no problem.
Can I dm someone about this I don’t want to start banding my address about on this public forum
GitHub is where people build software. More than 40 million people use GitHub to discover, fork, and contribute to over 100 million projects.
peepypoopy30-Sep-19 07:36 AM
@smk762 - dracocanis ominator That other pin seems to point to another address unfortunately. I must have set up a few wallets. I actually have three seeds written down none of which correlate with the address which holds my funds
could a previous pin be overwritten in an update of the wallet?
smk762 - dracocanis ominator30-Sep-19 07:38 AM
yeah thats something completely different, that repo is not maintained by KomodoPlatform. Once you have an electrum up and running, PR the server details to our coins repo, then I can link you to some guides to test mm2 compatibility.
peepypoopy30-Sep-19 07:38 AM
this is very frustrating, i'm very diligent about writing down seeds
smk762 - dracocanis ominator30-Sep-19 07:38 AM
pins wont be overwritten - old Agama and Verus Agama use different folders
do you have any wallet.dat from native mode perhaps?
and if you log in to old wallet does it give the address you're looking for?
![HATCH] Hatch30-Sep-19 07:42 AM
@smk762 - dracocanis ominator Perhaps you know those who want to create and maintain an electrum server for HATCH for free. Not even for free, we can give them a reward from 1 masternode for the stimulus. We can write all the code for them.(edited)
peepypoopy30-Sep-19 07:44 AM
If i log into an old wallet which tells me to switch to another server i get a different address
If i DM you the address with my tokens are you able to tell me if it was set up in native mode?
Requirements: Latest Agama - download from here Your Seed Phrase or your Pin Password Steps...
peepypoopy30-Sep-19 08:04 AM
im looking into it, thanks for this btw, appreciated
1
smk762 - dracocanis ominator30-Sep-19 08:05 AM
once you have correct wif, you can log in to lite mode with it, or import it into native mode.
![HATCH] Hatch30-Sep-19 08:15 AM
@smk762 - dracocanis ominator Perhaps you know how to contact cipig.net to create an entry or an electrum server?
peepypoopy30-Sep-19 08:15 AM
no joy, like i say the 3 seeds i have are all different wallet addresses fromthe one that holds my funds. I just tried them all and saw the addresses. why would i have seeds for addresses I never used, looking at KMD explorer there is basically one transaction from my bittrexx wallet to my agama wallet, and I dont have the seed for that written down, utterly confusing
smk762 - dracocanis ominator30-Sep-19 08:16 AM
have you tried all pins in all wallets?
peepypoopy30-Sep-19 08:19 AM
hmmm, ill try that now
smk762 - dracocanis ominator30-Sep-19 08:20 AM
@![HATCH] Hatch@cipi maintains a few electrum servers, but servers aren't free
gcharang30-Sep-19 08:24 AM
@peepypoopy you mentioned there was a old agama wallet installed that was showing the correct address
can you access it now?
peepypoopy30-Sep-19 08:25 AM
thas weird i just changed the pin in sheperd/pin to an new pin but when i load the agama the older pin is coming up instead of the on i am replacing it with??
![HATCH] Hatch30-Sep-19 08:26 AM
@smk762 - dracocanis ominator Do they create a separate coin node for each electrum server or do all three servers use the same node?
peepypoopy30-Sep-19 08:26 AM
@gcharang There isnt im afraid the only way I can see my wallet with my funds is via the kmd explorer
which is mental
Like, why would i transfer all my kmd to a wallet whcih i cannot access, how could I do that even?!?
smk762 - dracocanis ominator30-Sep-19 08:28 AM
I'm not sure about the servers, probably depends on load and webserver settings
a single domain can have numerous servers behind it
peepypoopy30-Sep-19 08:29 AM
I transfered the funds from bittrex, im sure i would have checked they went in there okay at the time, but now i cannot accesss that wallet through agama, nuts!
gcharang30-Sep-19 08:30 AM
@peepypoopy can you confirm that you are entering the seed words in the filed named "Wallet seed/wif" and you are seing the green text "Iguana 256 bits" after entering all the words?(edited)
peepypoopy30-Sep-19 08:32 AM
yes, definitely
gcharang30-Sep-19 08:32 AM
can you send me the address you can see in the explorer in dm ?
peepypoopy30-Sep-19 08:35 AM
sent, i tried to look on bittrex to see the transaction but looks like bittrex generate a new address each time
gcharang30-Sep-19 08:36 AM
you may be able to see previous withdrawal transactions
the transaction id is enough to find the address
peepypoopy30-Sep-19 08:39 AM
I definitely checked the funds went in, obviously i would, then left them there thinking they were safe not on ana exchange. All this happened after i read about the agama wallet being compromised so I went back in and... well here we are..
SHossain30-Sep-19 02:07 PM
bittrex generate a new address each time
i never saw bittrex generating new address everytime. it's always the same for last 3 years
aim77701-Oct-19 03:07 AM
Hi, May I ask is the Verus Agama the latest wallet we should use? Just to verify. Thanks
A wide variety of wallets can be used to securely store KMD assets, including desktop, mobile, hardware, and paper. Check out all the Komodo wallets here.
aim77701-Oct-19 05:45 AM
Thanks
John M.01-Oct-19 04:51 PM
Hey guys, how would one go about getting an asset listed on Komodo platform?


In this short article I describe how to use Sphinx and Thinking Sphinx (v3) in a Ruby on Rails application to index the same ActiveRecord model with separate criterias using two indices.
This article is not an intruduction on the open source search engine Sphinx and its Ruby library ThinkingSphinx but rather how to solve a problem I faced multiple times and not very well documented online.
I will use a simplified example adapted from a real life application. A company has a web portal where users can view product representatives details. The company has a mangement console where admins can update the product representatives information. Both need to search the representatives data stored in a relational database table–and loaded in a Contact ActiveRecord object–but with different criterias.
To make this example manageable I am defining only one criteria different between admin and user search: A user can’t see a contact that isn’t active but an admin can. You already know real life applications aren’t that simple–in real life there are likely a multitude of criterias different between admin and user search and this solution works there.
# /app/indices/contact_index.rb
ThinkingSphinx::Index.define :contact, :with => :active_record do
indexes :first_name
indexes :last_name
indexes :phone_number
where "active = true" # simplified condition to make the example manageable
has "false", as: :user_view_only, type: :boolean
end
# /app/indices/admin_contact_index.rb
ThinkingSphinx::Index.define :contact, :name => 'admin_contact', :with => :active_record do
indexes :first_name
indexes :last_name
has "true", as: :admin_view_only, type: :boolean
end
The admin_contact is a separate index used for admin search only but by default searching on Contact.search
or doing an application wide search via ThinkingSphinx.search
would use both the admin_contact_index.rb
and admin_contact.rb
indexes–that is why I leverage the admin_view_only static attribute to ignore the user view index. For example:
Contact.create!(first_name: 'Enrico', last_name: 'Teotti', active: false)
Contact.create!(first_name: 'Enrico', last_name: 'Piovani', active: true)
# reindex Sphinx on console with rake ts:index
ThinkingSphinx.search('Enrico', with: { admin_view_only: true })
# returns Contact entries for admin only, ignoring the filter on active flag
# set on regular index. Given the above data you will get both Piovani and
# Teotti back.
ThinkingSphinx.search('Enrico', with: { user_view_only: true })
# Only Piovani will come back because of the active filter.
Conclusions
I think one disadvantage of this solution is to add an attribute to all non admin indexes to ensure they don’t conflict and also a second index increasing file size and potentially indexing time.
The advantage is delegating to Sphinx the search rather then having specific search parameters set on search calls for each application portion–also this strategy can be shared by the other indices that need different search criteria between user view and admin.
The described condition alone doesn’t justify the use of Sphinx or this strategy but in a real evolving application that is rarely the only condition that search runs on–this static attribute strategy has been a good fit when implementing search segregation.


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Here are featured projects that I have worked on. Click on them for an article discussing how I made them and for a link to the projects GitHub page. I'm working on making live demos for these projects. {% for page in site.pages %} {% if page.isProject %}
{% endif %} {% endfor %}


Pizza Party Palace
What Toppings would you like?
Cheese
Pepperoni
Sausage
Tomtatoes
Olives
What size pizza would you like?
Small
Medium
Large
HOW MUCH?
YOUR ORDER WILL BE:


Basic web-app utilizing Spotify's Web API
Log in with Spotify
Obtain new token using the refresh token (Press here in case Song Information doesnt update)


Comparison of UVPD and ECD to Distinguish Between the Isomeric Products of Deamidation using FT-ICR MS
Anisha Haris, Yuko P. Y. Lam, Christopher A. Wootton, Alina Theisen, Cookson K. C. Chiu, Tomos E. Morgan, Mark P. Barrow, and Peter B. O’Connor
Deamidation of asparagine (Asn) is a spontaneous and non-enzymatic post-translational modification in proteins, playing a significant role in diseases related to aging such as Alzheimer’s and Parkinson’s disease. When this deamidation occurs, it results in isomeric aspartic acid (Asp) products.
To gain a better understanding of these products and the role they play, there are two methods that could be used to distinguish between isoAsp and Asp peptides: ultraviolet photodissociation (UVPD) and electron-capture dissociation (ECD).
To find out more about which of these methods is most suitable, download this poster, which details:
- A comparison of UVPD and ECD
- How FT-ICR MS can be used in this comparison
- The experimental methods used to compare


This blog does not yet have an 'About' post. Create 'About' post.
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This is the second project that I worked on. I was responsible for many of the MVC back-end routes.
With this project I created a database server for an E-Commerce site to update their backroom storage.
This project was a Node Server program that you can use to build a website for your development team.
Utilizing the NPM package Inquirer this project will help users create a Readme for their project.


Rafael Sierra¶
Online Presence¶
- Github
Interests¶
I am interested in everything related to open source development, I enjoy writing and consuming webservices, as well as creating useful tools that helps with my daily tasks.
After learning Docker I started reading and playing with Go and Rust.
Technical Skills¶
Python¶
Most of my experience as developer comes from creating all sorts of services and tools in Python (2 and 3), from simple HTTP servers to multi interconnected microservices with asynchronous calls and tasks (via Celery)
Django¶
I have vast experience with Django as I have been using it since version 0.97, I am comfortable with its whole stack, including writing custom middlewares, authentication backends and model managers and queryset.
Django Rest Framework is one of the tools I have used extensively to create RESTful APIs inside Django.
Docker¶
I have good experience creating and running Docker containers and images from scratch (not FROM SCRATCH), using multi-staged builds to improve image size whenever possible.


MapTableViewCell
class MapTableViewCell : MeetingEditorViewCell, MKMapViewDelegate
This is the table view class for the map editor prototype.
-
These are the three types of map:
See moreDeclaration
Swift
enum MapTypeValues : Int
-
Initial map size
Declaration
Swift
private let _mapSizeInDegrees: Double
-
The map view instance
Declaration
Swift
@IBOutlet weak var mapView: MKMapView!
-
The segmented switch for selecting the map type
Declaration
Swift
@IBOutlet weak var mapTypeSegmentedView: UISegmentedControl!
-
The marker for the meeting
Declaration
Swift
private var _meetingMarker: MapAnnotation!
-
We set up our label, name and placeholder.
Declaration
Swift
override func meetingObjectUpdated()
-
Called when the user changes the map type.
Declaration
Swift
@IBAction func mapTypeChanged(_ sender: UISegmentedControl)
Parameters
sender
The segmented control.
-
Tells the object to add its meeting marker to the map. This also sets the map to be right at the meeting location.
Declaration
Swift
func addMeetingMarker(_ inSetZoom: Bool)
Parameters
inSetZoom
If true, the map will force a zoom. Otherwise, the zoom will be unchanged.
-
Declaration
Swift
func moveMeetingMarkerToLocation(_ coordinate: CLLocationCoordinate2D, inSetZoom: Bool)
Parameters
coordinate
New coordinate
inSetZoom
If true, the map will force a zoom. Otherwise, the zoom will be unchanged.
-
Creates a new marker annotiation for the map.
Declaration
Swift
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?
Parameters
mapView
The MKMapView object that is having the marker added.
viewFor
The annotation that we need to generate a view for.
Return Value
A new annotation view, with our marker.
-
This responds to a marker being moved.
Declaration
Swift
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, didChange newState: MKAnnotationView.DragState, fromOldState oldState: MKAnnotationView.DragState)
Parameters
mapView
The MKMapView object that contains the marker being moved.
annotationView
The annotation that was changed.
didChange
The new state of the marker.
fromOldState
The previous state of the marker.
-
This responds to the map’s region being changed. We simply use this to “preselect” the marker, so there’s no need for two taps.
Declaration
Swift
func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool)
Parameters
mapView
The MKMapView object that contains the marker being moved.
animated
True, if the change was animated.
-
This responds to the marker’s selection turning off. We simply use this to “preselect” the marker, so there’s no need for two taps.
Declaration
Swift
func mapView(_ mapView: MKMapView, didDeselect view: MKAnnotationView)
Parameters
mapView
The MKMapView object that contains the marker being moved.
didDeselect
The annotation view (it’s ignored. We always select our marker, no matter what).


A Year Old Panic! At The Disco Song Has Become A Massive Meme. But Why?
by Joseph EarpLast year, Panic! At The Disco dropped the single ‘High Hopes‘ and came roaring back into the cultural conversation.
The song was a bold new direction for the act. No mere throwback, it was thoroughly modern, filled with crashing electro and an ear-wormy chorus. It was also an enormous success, their highest ever charting single. Damned be to the haters: Panic! At The Disco were once more a massive pop act.
Why does any of this matter? Well, a whole year after the single first hit the airwaves it’s become a massive meme again — and thanks, weirdly enough, to a candidate for the Presidency of the United States.
It’s All Pete Buttigieg’s Fault
Pete Buttigieg is one of the democratic nominees for the Presidency. He’s gay, an army veteran, and a Christian.
He’s also proving to be something of the underdog in the race. While higher-profile candidates like Beto O’Rourke and Cory Booker have either trailed in the polls or dropped out of the race altogether, Buttigieg has stayed strong.
Which is weird, given that Buttigieg’s reputation amongst both political commentators and the youth is as a daggy, overripe dad.
That’s where ‘High Hopes’ comes in: that reputation has not been helped by an extremely cursed video of his supporters practicing a dance to the Panic! At The Disco hit.
I could explain the thing, but it’s so deeply cursed that it needs to be watched in full, with as little context as possible:
Anyway, not content to keep their bold new dance behind closed doors, Buttigieg supporters have taken the thing out onto the streets, in one of the most inexplicable videos of the election cycle so far.
Weird stuff.
Which is exactly why the internet is obsessed with it.
And Now It’s A Meme
Since the video of the Buttigieg supporters went viral, a number of internet denizens have parodied the song, spawning a meta-meme.
Most notably, Adam Friedland of wildly popular podcast Cum Town did his thing with the track.
Inevitably, as the meme has gone on, the videos have gotten stranger and stranger.
Shit is wild, basically.
It’s also kinda good for Buttigieg, even if the joke is at his expense. The Presidential race is wildly overcrowded, and the video has the man back in the news cycle. Wait till the man himself appears on TV doing the dance — it’ll be a matter of days.


This is where revolutions are born. Where social change begins. This is where you raise awareness and funds. Where you change the world. This is your key to tomorrow. This is your honor.
There’s a part of every one of us that dreams of a better world. That spark of inspiration to help a person, fix a neighborhood, or even change a nation.
Through this, people and organizations have the tools they need to share their cause far and wide and harness the power of generosity.
Learn more


National Crosscountry Champions for Trinidad and Tobago
Men (7 runnings) 25 Nov 2012 Port of Spain 24:43 8 km Denzel Ramirez-2 27 Nov 2011 Port of Spain 26:12 8 km Matthew Hagley 28 Nov 2010 Couva 30:34 8 km Denzel Ramirez 22 Nov 2009 Couva 31:35 8 km Richard Jones 2008 2007 2005
Women (7 runnings) 25 Nov 2012 Port of Spain 20:10 6 km Tonya Nero 27 Nov 2011 Port of Spain 22:55 6 km Kema McShine 28 Nov 2010 Couva 6 km Celine Lestrade 22 Nov 2009 Couva 30:36 6 km Shermin Lasaldo 2008 2007 2005
Most Titles
Men
(2005/date)
2
Denzel Ramirez
2010,2012
Women (2005/date)
No woman has won more than once, according to available information.
Last Updated on 27 Dec 2012
Contributor: Bernard Linley (20)


importance: 5
Here’s the code with Rabbit
extending Animal
.
Unfortunately, Rabbit
objects can’t be created. What’s wrong? Fix it. ```js run class Animal {
constructor(name) { this.name = name; }
}
class Rabbit extends Animal { constructor(name) {
this.name = name; this.created = Date.now(); } }
! let rabbit = new Rabbit(“White Rabbit”); // Error: this is not defined /! alert(rabbit.name); ```


The whole world is everchanging and so is the automobile industry. With different technologies making cars both more fun and safer to drive, attention is also being paid to make automobiles greener and thus safer for the environment. When we associate the word “green” with the term “cars”, the first thing that comes to our mind is “Electric Cars”. The Electric Cars market is rapidly gaining market owing to its advantages over the IC Engine counterpart.
Though electric cars seem to be a rather new invention compared to the ICE, it is not. In fact, some automobile historians suggest that electric motors were developed earlier than internal combustion engines. Enthusiasts of Scot developed wagons that ran without an ox or a horse using electric motors as early as 1840s. But the batteries were not rechargeable back then. The development of batteries should have paved their way to electric cars being released into the market much earlier, but the effectiveness and muscle of ICE was not easy to replace! The first electric car to be mass produced was GM EV1 which was launched in 1995 to comply with California Air Resources Board. But GM lost money in this car. The history of Electric Cars is an interesting thing to google and you should do it after reading this blog!
Most of the population in general don’t have the idea regarding the types of electric cars. According to them an electric car is mainly of one type only and it runs fully on electric batteries. So, let’s get on with the different types of electric cars. Electric cars are broadly classified into 3 categories based on the degree to which electricity is used as their energy source.
These are the type of cars which are fully powered by electricity. These are powered by rechargeable batteries with no IC Engine. These cars keep electricity onboard using high-capacity battery packs which run the electric motors as well as all other systems that require energy. The battery can be charged at power charging stations as well as at home!
The chargers used to charge the batteries of EV are of 3 types: Level 1, Level 2 and Level 3. The classifications are based on the time taken to charge the batteries. Level 1 chargers can charge the car at a power supply of 120V. thus Level 1 can charge the car at your home or at your workplace. I have added a picture below clearly stating the uses of each.
Examples of BEVs:
These cars are powered by both electricity and gasoline. PHEVs can recharge their batteries through both plugged-in charging from an external source and regenerative braking. Regenerative braking is the process of using the heat from the brakes to charge up the battery.
PHEVs are also called as Extended Range Electric Vehicles (EREVs). Mileage range of PHEVs vary from 10-40 miles before the gasoline engine comes into action. In normal Hybrid Electric Vehicles, it’s only 1-2 miles before the gasoline engine is turned on.
Examples of PHEVs:
HEVs are also power by both electricity as well as gasoline. But in case of HEVs, the source of electricity is only regenerative braking and no plugged-in charging like PHEVs. The car can run for 1-2 miles on electric power after which gasoline energy has to kick in.
The car starts using the electric power. After a few miles with increase in load and speed, the supply is shifted to gasoline power. A computer controls the two engines to ensure best possible economy.
Examples of HEVs:
I hope I was able to clearly distinguish between the three major varieties of Electric Vehicles. The applications of these also vary to a certain extent. It mainly varies on how you are going to use it. I will be discussing on this topic in my next blog. Stay tuned!


Who WE Are
KDL Automation Ltd was established in 2015 with the idea to provide homeowners the best automation system that promotes easy living, offers convenient home security, and fully tailored home entertainment. Our services are bespoke – infinitely configurable, allowing for a truly individual design. We closely work with our clients to achieve their vision, their idea, to the very highest technical standards.
Our company has developed from real-world critical automation systems while our extensive experience in the industry allows us for out of the box ideas to become reality. Our automation systems help taking over the repetitive mundane tasks, effortlessly manage energy consumption, and provide a full integration between all systems.
At KDL Automation, we take control of all project elements, from the initial system design to the installation and aftercare, building relationships that thrive and grow as your environment.


Hi, this is Mike Chen. Just to give a quick background introduction to myself: I am currently a freshman in Thurgood Marshall College at UCSD. Though I initially entered as a chemistry major, soon I decided chemical engineering, research on petroleum refinery, inspection on structure of molecules are definitely not what I would like to do lifelong for my heart, so I switched to cognitive science HCI specialization, now I am considering a double major in cognitive science and computer engineering or computer science joint with math program.
Big link!


Here is a list of all documented class members with links to the class documentation for each member: