Feminist Majority Foundation - Equality around the world [ http://feministcampus.org/conferences/2016-nyflc/ ]
Hi there Dry,
Today, you’re probably marathoning House of Cards - but two weeks from now, when you’re all caught up on Underwood 2016, what will you do? If you love fighting for the issues you believe in and want to keep the momentum offor our Congressional Visit Day [ http://org.salsalabs.com/o/1400/p/salsa/event/common/public/?event_KEY=85182 ]! [http://org.salsalabs.com/o/1400/p/salsa/event/common/public/?event_KEY=85182 ]
On Monday March 14 students from across the country are heading to Capitol Hill to meet with representatives and their staffs to talk about advancing feminist policies in 2016. Be a part of the political process with this aweome opportunity!
This weekend is also your last chance to register forngressional Visit Day while you’re at it! [ http://org.salsalabs.com/o/1400/p/salsa/event/common/public/?event_KEY=85182 ]
C'mon, what would Frank do?
Your Mid-Atlantic Organizer,
Kelli Musick
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open suspend fun deleteConnectionWithVertexes(connection: Connection): List<Vertex>
Removes connection with according vertexes.
Return Vertexes that have been removed.


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Wrapper for the chess engine. This is here to allow for the expansion of other protocols, but none are planned at the moment. It's provides far more logic than just the chese engine though (which really at its heart just evaluates a given position)
More...
|
| string | BestMove [get] |
| | Gets the best move from the engine. This should only be called after the engine has responded (which will also have the move) so this is really a cache of that last best move More...
|
| |
| IChessEngine | Engine [get] |
| | Returns the current underlying IChessEngine interface More...
|
| |
Wrapper for the chess engine. This is here to allow for the expansion of other protocols, but none are planned at the moment. It's provides far more logic than just the chese engine though (which really at its heart just evaluates a given position)
◆ ChessEngineWrapper()
| AllPawnsMustDie.ChessEngineWrapper.ChessEngineWrapper |
( |
string |
fullPathToEngine | ) |
|
Create a new engine wrapper object
- Parameters
-
| fullPathToEngine | Path to the chess engine exe. E.g. stockfish.exe |
◆ Dispose()
| void AllPawnsMustDie.ChessEngineWrapper.Dispose |
( |
| ) |
|
Dispose of underlying engine
◆ NewGame()
| void AllPawnsMustDie.ChessEngineWrapper.NewGame |
( |
| ) |
|
◆ NewPosition()
| void AllPawnsMustDie.ChessEngineWrapper.NewPosition |
( |
string |
fenString | ) |
|
Set a new position with the engine
- Parameters
-
| fenString | FEN for the new position |
◆ Quit()
| void AllPawnsMustDie.ChessEngineWrapper.Quit |
( |
| ) |
|
◆ SendMove()
| void AllPawnsMustDie.ChessEngineWrapper.SendMove |
( |
string |
san | ) |
|
Sets a new position based on a list of moves. This is the history of the game, plus the latest move (e.g. the string gets longer as you play)
- Parameters
-
| san | Send a move in standard algebraic notation |
◆ BestMove
| string AllPawnsMustDie.ChessEngineWrapper.BestMove |
|
get |
Gets the best move from the engine. This should only be called after the engine has responded (which will also have the move) so this is really a cache of that last best move
◆ Engine
The documentation for this class was generated from the following file:
- AllPawnsMustDie/ChessEngineWrapper.cs


Short repetition from last week. Discussion of momentum and angular momentum. Reading suggestion: Taylor sections 3.1-3.4
More on angular momentum, Taylor sections 3.4 and 3.5. Discussion of potential energy and conservative forces. Reading suggestions: Taylor section 4.2
Conservative forces and potential energy. Reading suggestion: Taylor sections 4.2-4.4
If you wish to read more about conservative forces or not, Feyman's lectures from 1963 are quite interesting. He states for example that All fundamental forces in nature appear to be conservative. This statement was made while developing his argument that there are no nonconservative forces. You may enjoy the link to Feynman's lecture.
Last week (Friday) we observed that energy was conserved for a force which depends only on the position. In particular we considered a force acting on a block attached to a spring with spring constant \( k \). The other end of the spring was attached to the wall.
The force \( F_x \) from the spring on the block was defined as
$$
F_x=-kx.
$$
The work done on the block due to a displacement from a position \( x_0 \) to \( x \)
$$
W=\int_{x_0}^{x}F_xdx'=\frac{1}{2}kx_0^2-\frac{1}{2}kx^2.
$$
$$
W=\frac{1}{2}mv^2(x)-\frac{1}{2}mv_0^2=\frac{1}{2}kx_0^2-\frac{1}{2}kx^2,
$$
which we rewrote as
$$
\frac{1}{2}mv^2(x)+\frac{1}{2}kx^2=\frac{1}{2}mv_0^2+\frac{1}{2}kx_0^2.
$$
The total energy, which is the sum of potential and kinetic energy, is conserved. We will analyze this interesting result now in more detail when we study energy, momentum and angular momentum conservation.
But before we start with energy conservation, conservative forces and potential energies, we need to revisit our definitions of momentum and angular momentum.
A conservative force is a force whose property is that the total work done in moving an object between two points is independent of the taken path. This means that the work on an object under the influence of a conservative force, is independent on the path of the object. It depends only on the spatial degrees of freedom and it is possible to assign a numerical value for the potential at any point. It leads to conservation of energy. The gravitational force is an example of a conservative force.
First, a conservative force depends only on the spatial degrees of freedom. This is a necessary condition for obtaining a path integral which is independent of path. The important condition for the final work to be independent of the path is that the curl of the force is zero, that is
$$
\boldsymbol{\nabla} \times \boldsymbol{F}=0
$$
The work-energy theorem states that the work done \( W \) by a force \( \boldsymbol{F} \) that moves an object from a position \( \boldsymbol{r}_0 \) to a new position \( \boldsymbol{r}_1 \)
$$
W=\int_{\boldsymbol{r}_0}^{\boldsymbol{r}_1}\boldsymbol{F}\boldsymbol{dr}=\frac{1}{2}mv_1^2-\frac{1}{2}mv_0^2,
$$
where \( v_1^2 \) is the velocity squared at a time \( t_1 \) and \( v_0^2 \) the corresponding quantity at a time \( t_0 \).
The work done is thus the difference in kinetic energies. We can rewrite the above equation as
$$
\frac{1}{2}mv_1^2=\int_{\boldsymbol{r}_0}^{\boldsymbol{r}_1}\boldsymbol{F}\boldsymbol{dr}+\frac{1}{2}mv_0^2,
$$
that is the final kinetic energy is equal to the initial kinetic energy plus the work done by the force over a given path from a position \( \boldsymbol{r}_0 \) at time \( t_0 \) to a final position position \( \boldsymbol{r}_1 \) at a later time \( t_1 \).
Before we move on however, we need to remind ourselves about important aspects like the linear momentum and angular momentum. After these considerations, we move back to more details about conservatives forces.
Assume we have \( N \) objects, each with velocity \( \boldsymbol{v}_i \) with \( i=1,2,\dots,N \) and mass \( m_i \). The momentum of each object is \( \boldsymbol{p}_i=m\boldsymbol{v}_i \) and the total linear (or mechanical) momentum is defined as
$$
\boldsymbol{P}=\sum_{i=1}^N\boldsymbol{p}_i=\sum_{i=1}^Nm_i\boldsymbol{v}_i,
$$
Let us assume we have two objects only that interact with each other and are influenced by an external force.
We define also the total net force acting on object 1 as
$$
\boldsymbol{F}_1^{\mathrm{net}}=\boldsymbol{F}_1^{\mathrm{ext}}+\boldsymbol{F}_{12},
$$
where \( \boldsymbol{F}_1^{\mathrm{ext}} \) is the external force (for example the force due to an electron moving in an electromagnetic field) and \( \boldsymbol{F}_{12} \) is the force between object one and two. Similarly for object 2 we have
$$
\boldsymbol{F}_2^{\mathrm{net}}=\boldsymbol{F}_2^{\mathrm{ext}}+\boldsymbol{F}_{21}.
$$
Newton's third law which we met earlier states that for every action there is an equal and opposite reaction. It is more accurately stated as
if two bodies exert forces on each other, these forces are equal in magnitude and opposite in direction.
This means that for two bodies \( i \) and \( j \), if the force on \( i \) due to \( j \) is called \( \boldsymbol{F}_{ij} \), then
$$
\begin{equation}
\boldsymbol{F}_{ij}=-\boldsymbol{F}_{ji}.
\tag{1}
\end{equation}
$$
For the abovementioned two objects we have thus \( \boldsymbol{F}_{12}=-\boldsymbol{F}_{21} \).
With the net forces acting on each object we can now related the momentum to the forces via
$$
\boldsymbol{F}_1^{\mathrm{net}}=m_1\boldsymbol{a}_i=m_1\frac{d\boldsymbol{v}_i}{dt}=\boldsymbol{F}_1^{\mathrm{ext}}+\boldsymbol{F}_{12},
$$
and
$$
\boldsymbol{F}_2^{\mathrm{net}}=m_2\boldsymbol{a}_2=m_1\frac{d\boldsymbol{v}_i}{dt}=\boldsymbol{F}_2^{\mathrm{ext}}+\boldsymbol{F}_{21}.
$$
Recalling our definition for the linear momentum we have then
$$
\frac{d\boldsymbol{p}_1}{dt}=\boldsymbol{F}_1^{\mathrm{ext}}+\boldsymbol{F}_{12},
$$
and
$$
\frac{d\boldsymbol{p}_2}{dt}=\boldsymbol{F}_2^{\mathrm{ext}}+\boldsymbol{F}_{21}.
$$
The total momentum \( \boldsymbol{P} \) is defined as the sum of the individual momenta, meaning that we can rewrite
$$
\boldsymbol{F}_1^{\mathrm{net}}+\boldsymbol{F}_2^{\mathrm{net}}=\frac{d\boldsymbol{p}_1}{dt}+\frac{d\boldsymbol{p}_2}{dt}=\frac{d\boldsymbol{P}}{dt},
$$
that is the derivate with respect to time of the total momentum. If we now write the net forces as sums of the external plus internal forces between the objects we have
$$
\frac{d\boldsymbol{P}}{dt}=\boldsymbol{F}_1^{\mathrm{ext}}+\boldsymbol{F}_{12}+\boldsymbol{F}_2^{\mathrm{ext}}+\boldsymbol{F}_{21}=\boldsymbol{F}_1^{\mathrm{ext}}+\boldsymbol{F}_2^{\mathrm{ext}}.
$$
The derivative of the total momentum is just the sum of the external forces. If we assume that the external forces are zero and that only internal (here two-body forces) are at play, we obtain the important result that the derivative of the total momentum is zero. This means again that the total momentum is a constant of the motion and conserved quantity. This is a very important result that we will use in many applications to come.
Let us now general to several objects \( N \) and let us also assume that there are no external forces. We will label such a system as an isolated system.
Newton's second law, \( \boldsymbol{F}=m\boldsymbol{a} \), can be written for a particle \( i \) as
$$
\begin{equation}
\boldsymbol{F}_i=\sum_{j\ne i}^N \boldsymbol{F}_{ij}=m_i\boldsymbol{a}_i,
\tag{2}
\end{equation}
$$
where \( \boldsymbol{F}_i \) (a single subscript) denotes the net force acting on \( i \) from the other objects/particles. Because the mass of \( i \) is fixed and we assume it does not change with time, one can see that
$$
\begin{equation}
\boldsymbol{F}_i=\frac{d}{dt}m_i\boldsymbol{v}_i=\sum_{j\ne i}^N\boldsymbol{F}_{ij}.
\tag{3}
\end{equation}
$$
Now, one can sum over all the objects/particles and obtain
$$
\frac{d}{dt}\sum_i m_iv_i=\sum_{ij, i\ne j}^N\boldsymbol{F}_{ij}=0.
$$
How did we arrive at the last step? We rewrote the double sum as
$$
\sum_{ij, i\ne j}^N\boldsymbol{F}_{ij}=\sum_i^N\sum_{j>i}\left(\boldsymbol{F}_{ij}+\boldsymbol{F}_{ji}\right),
$$
and using Newton's third law which states that \( \boldsymbol{F}_{ij}=-\boldsymbol{F}_{ji} \), we obtain that the net sum over all the two-particle forces is zero when we only consider so-called internal forces. Stated differently, the last step made use of the fact that for every term \( ij \), there is an equivalent term \( ji \) with opposite force. Because the momentum is defined as \( m\boldsymbol{v} \), for a system of particles, we have thus
$$
\begin{equation}
\frac{d}{dt}\sum_im_i\boldsymbol{v}_i=0,~~{\rm for~isolated~particles}.
\tag{4}
\end{equation}
$$
By "isolated" one means that the only force acting on any particle \( i \) are those originating from other particles in the sum, i.e. "no external" forces. Thus, Newton's third law leads to the conservation of total momentum,
$$
\boldsymbol{P}=\sum_i m_i\boldsymbol{v}_i,
$$
and we have
$$
\frac{d}{dt}\boldsymbol{P}=0.
$$
Consider a rocket of mass \( M \) moving with velocity \( v \). After a brief instant, the velocity of the rocket is \( v+\Delta v \) and the mass is \( M-\Delta M \). Momentum conservation gives
$$
\begin{eqnarray*}
Mv&=&(M-\Delta M)(v+\Delta v)+\Delta M(v-v_e)\\
0&=&-\Delta Mv+M\Delta v+\Delta M(v-v_e),\\
0&=&M\Delta v-\Delta Mv_e.
\end{eqnarray*}
$$
In the second step we ignored the term \( \Delta M\Delta v \) because it is doubly small. The last equation gives
$$
\begin{eqnarray}
\Delta v&=&\frac{v_e}{M}\Delta M,\\
\nonumber
\frac{dv}{dt}&=&\frac{v_e}{M}\frac{dM}{dt}.
\end{eqnarray}
$$
Integrating the expression with lower limits \( v_0=0 \) and \( M_0 \), one finds
$$
\begin{eqnarray*}
v&=&v_e\int_{M_0}^M \frac{dM'}{M'}\\
v&=&v_e\ln(M/M_0)\\
&=&v_e\ln[(M_0-\alpha t)/M_0].
\end{eqnarray*}
$$
Because the total momentum of an isolated system is constant, one can also quickly see that the center of mass of an isolated system is also constant. The center of mass is the average position of a set of masses weighted by the mass,
$$
\begin{equation}
\bar{x}=\frac{\sum_im_ix_i}{\sum_i m_i}.
\tag{5}
\end{equation}
$$
The rate of change of \( \bar{x} \) is
$$
\dot{\bar{x}}=\frac{1}{M}\sum_i m_i\dot{x}_i=\frac{1}{M}P_x.
$$
Thus if the total momentum is constant the center of mass moves at a constant velocity, and if the total momentum is zero the center of mass is fixed.
The angular momentum is defined as
$$
\begin{equation}
\boldsymbol{L}=\boldsymbol{r}\times\boldsymbol{p}=m\boldsymbol{r}\times\boldsymbol{v}.
\tag{6}
\end{equation}
$$
It means that the angular momentum is perpendicular to the plane defined by position \( \boldsymbol{r} \) and the momentum \( \boldsymbol{p} \) via \( \boldsymbol{r}\times \boldsymbol{p} \).
The rate of change of the angular momentum is
$$
\frac{d\boldsymbol{L}}{dt}=m\boldsymbol{v}\times\boldsymbol{v}+m\boldsymbol{r}\times\dot{\boldsymbol{v}}=\boldsymbol{r}\times{\boldsymbol{F}}
$$
The first term is zero because \( \boldsymbol{v} \) is parallel to itself, and the second term defines the so-called torque. If \( \boldsymbol{F} \) is parallel to \( \boldsymbol{r} \) then the torque is zero and we say that angular momentum is conserved.
If the force is not radial, \( \boldsymbol{r}\times\boldsymbol{F}\ne 0 \) as above, and angular momentum is no longer conserved,
$$
\begin{equation}
\frac{d\boldsymbol{L}}{dt}=\boldsymbol{r}\times\boldsymbol{F}\equiv\boldsymbol{\tau},
\tag{7}
\end{equation}
$$
where \( \boldsymbol{\tau} \) is the torque.
Let us assume we have an initial position \( \boldsymbol{r}_0=x_0\boldsymbol{e}_1+y_0\boldsymbol{e}_2 \) at a time \( t_0=0 \). We add now a force in the positive \( x \)-direction
$$
\boldsymbol{F}=F_x\boldsymbol{e}_1=\frac{d\boldsymbol{p}}{dt},
$$
where we used the force as defined by the time derivative of the momentum.
We can use this force (and its pertinent acceleration) to find the velocity via the relation
$$
\boldsymbol{v}(t)=\boldsymbol{v}_0+\int_{t_0}^t\boldsymbol{a}dt',
$$
and with \( \boldsymbol{v}_0=0 \) we have
$$
\boldsymbol{v}(t)=\int_{t_0}^t\frac{\boldsymbol{F}}{m}dt',
$$
where \( m \) is the mass of the object.
Since the force acts only in the \( x \)-direction, we have after integration
$$
\boldsymbol{v}(t)=\frac{\boldsymbol{F}}{m}t=\frac{F_x}{m}t\boldsymbol{e}_1=v_x(t)\boldsymbol{e}_1.
$$
The momentum is in turn given by \( \boldsymbol{p}=p_x\boldsymbol{e}_1=mv_x\boldsymbol{e}_1=F_xt\boldsymbol{e}_1 \).
Integrating over time again we find the final position as (note the force depends only on the \( x \)-direction)
$$
\boldsymbol{r}(t)=(x_0+\frac{1}{2}\frac{F_x}{m}t^2) \boldsymbol{e}_1+y_0\boldsymbol{e}_2.
$$
There is no change in the position in the \( y \)-direction since the force acts only in the \( x \)-direction.
We can now compute the angular momentum given by
$$
\boldsymbol{l}=\boldsymbol{r}\times\boldsymbol{p}=\left[(x_0+\frac{1}{2}\frac{F_x}{m}t^2) \boldsymbol{e}_1+y_0\boldsymbol{e}_2\right]\times F_xt\boldsymbol{e}_1.
$$
Computing the cross product we find
$$
\boldsymbol{l}=-y_0F_xt\boldsymbol{e}_3=-y_0F_xt\boldsymbol{e}_z.
$$
The torque is the time derivative of the angular momentum and we have
$$
\boldsymbol{\tau}=-y_0F_x\boldsymbol{e}_3=-y_0F_x\boldsymbol{e}_z.
$$
The torque is non-zero and angular momentum is not conserved.
One can write the torque about a given axis, which we will denote as \( \hat{z} \), in polar coordinates, where
$$
\begin{eqnarray}
x&=&r\sin\theta\cos\phi,~~y=r\sin\theta\cos\phi,~~z=r\cos\theta,
\end{eqnarray}
$$
to find the \( z \) component of the torque,
$$
\begin{eqnarray}
\tau_z&=&xF_y-yF_x\\
\nonumber
&=&-r\sin\theta\left\{\cos\phi \partial_y-\sin\phi \partial_x\right\}V(x,y,z).
\end{eqnarray}
$$
One can use the chain rule to write the partial derivative w.r.t. \( \phi \) (keeping \( r \) and \( \theta \) fixed),
$$
\begin{eqnarray}
\partial_\phi&=&\frac{\partial x}{\partial\phi}\partial_x+\frac{\partial_y}{\partial\phi}\partial_y
+\frac{\partial z}{\partial\phi}\partial_z\\
\nonumber
&=&-r\sin\theta\sin\phi\partial_x+\sin\theta\cos\phi\partial_y.
\end{eqnarray}
$$
Combining the two equations,
$$
\begin{eqnarray}
\tau_z&=&-\partial_\phi V(r,\theta,\phi).
\end{eqnarray}
$$
Thus, if the potential is independent of the azimuthal angle \( \phi \), there is no torque about the \( z \) axis and \( L_z \) is conserved.
For a system of isolated particles, one can write
$$
\begin{eqnarray}
\frac{d}{dt}\sum_i\boldsymbol{L}_i&=&\sum_{i\ne j}\boldsymbol{r}_i\times \boldsymbol{F}_{ij}\\
\nonumber
&=&\frac{1}{2}\sum_{i\ne j} \boldsymbol{r}_i\times \boldsymbol{F}_{ij}+\boldsymbol{r}_j\times\boldsymbol{F}_{ji}\\
\nonumber
&=&\frac{1}{2}\sum_{i\ne j} (\boldsymbol{r}_i-\boldsymbol{r}_j)\times\boldsymbol{F}_{ij}=0,
\end{eqnarray}
$$
where the last step used Newton's third law, \( \boldsymbol{F}_{ij}=-\boldsymbol{F}_{ji} \). If the forces between the particles are radial, i.e. \( \boldsymbol{F}_{ij} ~||~ (\boldsymbol{r}_i-\boldsymbol{r}_j) \), then each term in the sum is zero and the net angular momentum is fixed. Otherwise, you could imagine an isolated system that would start spinning spontaneously.
Energy conservation is most convenient as a strategy for addressing problems where time does not appear. For example, a particle goes from position \( x_0 \) with speed \( v_0 \), to position \( x_f \); what is its new speed? However, it can also be applied to problems where time does appear, such as in solving for the trajectory \( x(t) \), or equivalently \( t(x) \).
$$
\begin{equation}
\boldsymbol{F}(\boldsymbol{r})=-\boldsymbol{\nabla} V(\boldsymbol{r}).
\tag{8}
\end{equation}
$$
We say a force is conservative if it satisfies the following conditions:
The energy \( E \) of a given system is defined as the sum of kinetic and potential energies,
$$
E=K+V(\boldsymbol{r}).
$$
We define the potential energy at a point \( \boldsymbol{r} \) as the negative work done from a starting point \( \boldsymbol{r}_0 \) to a final point \( \boldsymbol{r} \)
$$
V(\boldsymbol{r})=-W(\boldsymbol{r}_0\rightarrow\boldsymbol{r})= -\int_{\boldsymbol{r}_0}^{\boldsymbol{r}}d\boldsymbol{r}'\boldsymbol{F}(\boldsymbol{r}').
$$
If the potential depends on the path taken between these two points there is no unique potential.
We study a classical electron which moves in the \( x \)-direction along a surface. The force from the surface is
$$
\boldsymbol{F}(x)=-F_0\sin{(\frac{2\pi x}{b})}\boldsymbol{e}_1.
$$
The constant \( b \) represents the distance between atoms at the surface of the material, \( F_0 \) is a constant and \( x \) is the position of the electron.
This is indeed a conservative force since it depends only on position and its curl is zero, that is \( -\boldsymbol{\nabla}\times \boldsymbol{F}=0 \). This means that energy is conserved and the integral over the work done by the force is independent of the path taken. We will come back to this in more detail next week.
Using the work-energy theorem we can find the work \( W \) done when moving an electron from a position \( x_0 \) to a final position \( x \) through the integral
$$
W=-\int_{x_0}^x \boldsymbol{F}(x')dx' = \int_{x_0}^x F_0\sin{(\frac{2\pi x'}{b})} dx',
$$
which results in
$$
W=\frac{F_0b}{2\pi}\left[\cos{(\frac{2\pi x}{b})}-\cos{(\frac{2\pi x_0}{b})}\right].
$$
Since this is related to the change in kinetic energy we have, with \( v_0 \) being the initial velocity at a time \( t_0 \),
$$
v = \pm\sqrt{\frac{2}{m}\frac{F_0b}{2\pi}\left[\cos{(\frac{2\pi x}{b})}-\cos{(\frac{2\pi x_0}{b})}\right]+v_0^2}.
$$
The potential energy, due to energy conservation is
$$
V(x)=V(x_0)+\frac{1}{2}mv_0^2-\frac{1}{2}mv^2,
$$
with \( v \) given by the velocity from above.
We can now, in order to find a more explicit expression for the potential energy at a given value \( x \), define a zero level value for the potential. The potential is defined, using the work-energy theorem, as
$$
V(x)=V(x_0)+\int_{x_0}^x (-F(x'))dx',
$$
and if you recall the definition of the indefinite integral, we can rewrite this as
$$
V(x)=\int (-F(x'))dx'+C,
$$
where \( C \) is an undefined constant. The force is defined as the gradient of the potential, and in that case the undefined constant vanishes. The constant does not affect the force we derive from the potential.
We have then
$$
V(x)=V(x_0)-\int_{x_0}^x \boldsymbol{F}(x')dx',
$$
which results in
$$
V(x)=\frac{F_0b}{2\pi}\left[\cos{(\frac{2\pi x}{b})}-\cos{(\frac{2\pi x_0}{b})}\right]+V(x_0).
$$
We can now define
$$
\frac{F_0b}{2\pi}\cos{(\frac{2\pi x_0}{b})}=V(x_0),
$$
which gives
$$
V(x)=\frac{F_0b}{2\pi}\left[\cos{(\frac{2\pi x}{b})}\right].
$$
We have defined work as the energy resulting from a net force acting on an object (or sseveral objects), that is
$$
W(\boldsymbol{r}\rightarrow \boldsymbol{r}+d\boldsymbol{r})= \boldsymbol{F}(\boldsymbol{r})d\boldsymbol{r}.
$$
If we write out this for each component we have
$$
W(\boldsymbol{r}\rightarrow \boldsymbol{r}+d\boldsymbol{r})=\boldsymbol{F}(\boldsymbol{r})d\boldsymbol{r}=F_xdx+F_ydy+F_zdz.
$$
The work done from an initial position to a final one defines also the difference in potential energies
$$
W(\boldsymbol{r}\rightarrow \boldsymbol{r}+d\boldsymbol{r})=-\left[V(\boldsymbol{r}+d\boldsymbol{r})-V(\boldsymbol{r})\right].
$$
We can write out the differences in potential energies as
$$
V(\boldsymbol{r}+d\boldsymbol{r})-V(\boldsymbol{r})=V(x+dx,y+dy,z+dz)-V(x,y,z)=dV,
$$
and using the expression the differential of a multi-variable function \( f(x,y,z) \)
$$
df=\frac{\partial f}{\partial x}dx+\frac{\partial f}{\partial y}dy+\frac{\partial f}{\partial z}dz,
$$
we can write the expression for the work done as
$$
W(\boldsymbol{r}\rightarrow \boldsymbol{r}+d\boldsymbol{r})=-dV=-\left[\frac{\partial V}{\partial x}dx+\frac{\partial V}{\partial y}dy+\frac{\partial V}{\partial z}dz \right].
$$
Comparing the last equation with
$$
W(\boldsymbol{r}\rightarrow \boldsymbol{r}+d\boldsymbol{r})=F_xdx+F_ydy+F_zdz,
$$
we have
$$
F_xdx+F_ydy+F_zdz=-\left[\frac{\partial V}{\partial x}dx+\frac{\partial V}{\partial y}dy+\frac{\partial V}{\partial z}dz \right],
$$
leading to
$$
F_x=-\frac{\partial V}{\partial x},
$$
and
$$
F_y=-\frac{\partial V}{\partial y},
$$
and
$$
F_z=-\frac{\partial V}{\partial z},
$$
or just
$$
\boldsymbol{F}=-\frac{\partial V}{\partial x}\boldsymbol{e}_1-\frac{\partial V}{\partial y}\boldsymbol{e}_2-\frac{\partial V}{\partial z}\boldsymbol{e}_3=-\boldsymbol{\nabla}V(\boldsymbol{r}).
$$
And this connection is the one we wanted to show.


Marla
Marla is a HTTP 1.1 server that depends on OpenSSL, and ncurses. Marla is written to work on Linux 2.6.17 or greater. Marla is licensed under the Apache License, version 2.0.
- Main
- Server
- Connection
- Request
- WriteEvent
- ChunkedPageRequest
- Backend
- Ring
- HTTP
Client read
|
Backend write
|
Client write
|
Backend read
|


We got services!
- transform real-time channels
- synergize vertical relationships
- streamline mission-critical architectures
- recontextualize one-to-one mindshare
- incubate viral web-readiness
- incubate revolutionary e-business
- repurpose impactful niches
- transform plug-and-play niches
- repurpose impactful e-business


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|
ARDP
2.1.3
Another RDF Document Parser
|
Hold informations about the lexer as well as the its internal state. More...
#include <lexer.h>
Data Fields | |
| dispatch_queue_t _Null_unspecified | lexer_queue |
| Queue (~thread) to run lexer at. More... | |
| dispatch_queue_t _Null_unspecified | event_queue |
| Queue (~thread) for events dispatching. More... | |
| enum lexer_status | state |
| Internal state of the lexer. More... | |
| off_t | line |
| Current line count in scanned file/block. More... | |
| utf8 _Nullable | string |
| String buffer for the current parsing. More... | |
| int | finished |
| Denotes if the lexer is still running (used only in file processing) More... | |
| struct { | |
| int cs | |
| Current state. More... | |
| int act | |
| Actual state. More... | |
| uint8_t *_Nullable ts | |
| Token start. More... | |
| uint8_t *_Nullable te | |
| Token end. More... | |
| } | env |
| Lexer environment setup used in Ragel. More... | |
| struct { | |
| int level | |
| How verbose is the output. More... | |
| int(* _Nullable )(int level, const char *_Nullable str) | |
| Log function to call for the level. More... | |
| } | log |
| Debugger and logger helper and level. More... | |
| struct { | |
| int(^ _Nullable )(int type, utf8 _Nullable value, size_t line, size_t col) | |
| Function which emits the token to the parent object(s). More... | |
| } | cb |
| Callback used in the lexer. More... | |
Hold informations about the lexer as well as the its internal state.
| int( ^ _Nullable) (int type, const char *_Nullable value) | ( | int | type, |
| utf8 _Nullable | value, | ||
| size_t | line, | ||
| size_t | col | ||
| ) |
Function which emits the token to the parent object(s).
| [in] | type | Type of the token. |
| [in] | value | Optional value of the token. |
: Should take arbitrary token type not only the turtle enum.
| int act |
Actual state.
Referenced by ardp_lexer_init(), ardp_lexer_process_block(), and ardp_lexer_turtle_process_block().
| struct { ... } cb |
Callback used in the lexer.
Referenced by ardp_lexer_init(), lexer_emit_token(), lexer_emit_token_const(), and lexer_emit_u8_token().
| int cs |
Current state.
Referenced by ardp_lexer_init(), ardp_lexer_process_block(), ardp_lexer_process_reader(), ardp_lexer_process_reader_old(), and ardp_lexer_turtle_process_block().
| struct { ... } env |
Lexer environment setup used in Ragel.
These variables are required by Ragel to work properly.
Referenced by ardp_lexer_init(), ardp_lexer_process_block(), ardp_lexer_process_reader(), ardp_lexer_process_reader_old(), and ardp_lexer_turtle_process_block().
| dispatch_queue_t _Null_unspecified event_queue |
Queue (~thread) for events dispatching.
Referenced by ardp_lexer_create(), ardp_lexer_process_block(), ardp_lexer_process_reader(), ardp_lexer_turtle_process_block(), lexer_emit_token(), lexer_emit_token_const(), and lexer_emit_u8_token().
| int finished |
Denotes if the lexer is still running (used only in file processing)
Referenced by ardp_lexer_create(), ardp_lexer_process_block(), ardp_lexer_process_reader(), ardp_lexer_process_reader_old(), and ardp_lexer_turtle_process_block().
| int level |
How verbose is the output.
Referenced by ardp_lexer_init(), and log().
| dispatch_queue_t _Null_unspecified lexer_queue |
Queue (~thread) to run lexer at.
Referenced by ardp_lexer_create(), and ardp_lexer_process_reader().
| off_t line |
Current line count in scanned file/block.
Referenced by ardp_lexer_defaults().
| struct { ... } log |
Debugger and logger helper and level.
Referenced by ardp_lexer_init(), and log().
| enum lexer_status state |
Internal state of the lexer.
Referenced by ardp_lexer_create(), ardp_lexer_defaults(), ardp_lexer_init(), ardp_lexer_state(), and ardp_lexer_turtle_debug().
String buffer for the current parsing.
Referenced by ardp_lexer_destroy(), ardp_lexer_process_block(), ardp_lexer_turtle_process_block(), and lexer_emit_u8_token().
| uint8_t* _Nullable te |
Token end.
Referenced by ardp_lexer_init(), ardp_lexer_process_block(), and ardp_lexer_turtle_process_block().
| uint8_t* _Nullable ts |
Token start.
Referenced by ardp_lexer_init(), ardp_lexer_process_block(), and ardp_lexer_turtle_process_block().


Mesos Hello world in Scala
In previous post, we installed mesos on ubuntu. In this post we are going to look at simple hello world on mesos. Here we are going to code a distributed shell which runs shell commands on any machine on the mesos cluster.
This post assumes that you have running mesos. If not, install and configure mesos using this post.
tl;dr you can get complete code for the example on github.
Mesos framework
Every application running on mesos is called as framework. In our example, our framework will be called as Distributed shell and it will be coded using Mesos Java API.
Mesos framework components
Every mesos framework has three important components
-
Client
Client is code which submits the tasks to the framework. Task is an abstraction used by mesos to indicate any piece of work which takes some resources. -
Scheduler
This is the important piece of the framework. A scheduler implement Mesos Scheduler interface. Scheduler takes tasks from client and runs on mesos cluster. -
Executor
Executor sets up environment to run each task given by client. Scheduler uses this executor to run each task. In this example we will use default executor provided by the mesos.
You can read more about mesos architecture here.
Distributed shell on Mesos
Let’s start coding simple hello world example on mesos. We will discuss each individual pieces of framework one by one.
Client
Mesos client is a simple Scala program which creates instance of Scheduler and submit tasks to it.
Mesos uses Google protocol buffer internally to do serialization. So each data structure in mesos follows builder design pattern.
The following are the steps to create the client
- Create framework info
Each framework running on mesos should identify itself using framework info data type. Usually framework info contains framework name, user information etc. Here we set our framework name as DistributedShell. All other properties are set to default.
- Create instance of Scheduler
Once we have framework info, we create instance of our scheduler. You can have multiple instance of scheduler running on mesos cluster at same time.
- Submit tasks
- Start mesos driver with our scheduler and framework
Mesos driver is the API which takes specified scheduler and framework info to create instance of scheduler on mesos cluster.
You can access complete code listing here.
Scheduler
ScalaScheduler is our framework scheduler which extends Mesos interface Scheduler. There are many call backs provided by Scheduler API, but here we are going to only concentrate on resourceOffers.
resourceOffers callback is called when mesos has some free resources. A resource can be memory,cpu or disk. So whenever there is a free resource, we submit a task.
- Create resource request for the task
For every task we submit to the mesos, we have to specify it’s resource requirements. In this example we are specifying that we need 1 CPU to run our shell command.
- Generate task id
Each task inside a framework, is identified using a taskid.
- Create taskinfo using command
After having resource information and task id, we create a task object. Here we are not specifying any specific executor to run the task. In this case, mesos will use its default executor named CommandExecutor.
- Launch the tasks
Once we have all the information ready for a task, we launch that task on the cluster.
You can access complete code listing here.
Running
Download complete project from github.
- Build
- Running
Every mesos application needs mesos shared library to be available in it’s path. It’s usually found in path $MESOS_HOME/src/.libs. You can specify it using _java.library.path.
The following is the command to run the example which will echo hello on mesos cluster.
You can also run many commands at a time.
Output
After running the example, you can see the output through mesos web interface. Navigate to localhost:5050
Here you should be able to see one task finished like below image.
click on sandbox link. You will be able to see the page as below
click on stdout link. You will be able to see the output as below
If you have ran multiple commands, then you will see multiple tasks.


/**
* Used to draw the hats and beards onto faces, given the bounding box and a p5.graphics object
* @namespace hat
*/
/**
* Represents a Santa Hat image that can be drawn to a surface
* @param p {p5} p5.js instance
* @param x1 {int} x-coordinate of the bounding box's top left corner
* @param y1 {int} y-coordinate of the bounding box's top left corner
* @param x2 {int} x-coordinate of the bounding box's bottom right corner
* @param y2 {int} y-coordinate of the bounding box's bottom right corner
* @constructor
* @memberof hat
*/
function SantaHat(p, x1, y1, x2, y2) {
// Width of the bounding box
let width = x2 - x1;
// Height of the bounding box
let height = y2 - y1;
// x offset for the image
let x_offset = 0;
// y offset for the image
let y_offset = 0;
// Image asset loaded on creation
let img = p.loadImage('img/hat.png');
/**
* Method to draw the hat on a given surface
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.draw = function (surf) {
surf.image(img, x1 - x_offset, y1 - y_offset);
}
/**
* Method to draw the bounding box for debugging purposes
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.drawBox = function (surf) {
surf.noFill();
surf.strokeWeight(10);
surf.rect(x1, y1, width, height);
}
/**
* Resizing function that is run after the image is loaded to
* fit the bounding box appropriately
* Also sets the offsets for x and y so it is positioned correctly
*/
this.resize = function () {
img.resize(width * 1.5, 0);
x_offset = width * .1
y_offset = height * .4;
}
}
/**
* Represents a ELf Hat image that can be drawn to a surface
* @see SantaHat
* @param p p5.js instance
* @param x1 {int} x-coordinate of the bounding box's top left corner
* @param y1 {int} y-coordinate of the bounding box's top left corner
* @param x2 {int} x-coordinate of the bounding box's bottom right corner
* @param y2 {int} y-coordinate of the bounding box's bottom right corner
* @constructor
* @memberof hat
*/
function ElfHat(p, x1, y1, x2, y2) {
let width = x2 - x1;
let height = y2 - y1;
let x_offset = 0;
let y_offset = 0;
let img = p.loadImage('img/elf.png');
/**
* Method to draw the hat on a given surface
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.draw = function (surf) {
surf.image(img, x1 - x_offset, y1 - y_offset);
}
/**
* Method to draw the bounding box for debugging purposes
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.drawBox = function (surf) {
surf.noFill();
surf.strokeWeight(10);
surf.rect(x1, y1, width, height);
}
/**
* Resizing function that is run after the image is loaded to
* fit the bounding box appropriately
* Also sets the offsets for x and y so it is positioned correctly
*/
this.resize = function () {
img.resize(width * 1.5, 0);
x_offset = width * .15
y_offset = height * 1.4;
}
}
/**
* Represents a Santa Beard image that can be drawn to a surface
* @see SantaHat
* @param p p5.js instance
* @param x1 {int} x-coordinate of the bounding box's top left corner
* @param y1 {int} y-coordinate of the bounding box's top left corner
* @param x2 {int} x-coordinate of the bounding box's bottom right corner
* @param y2 {int} y-coordinate of the bounding box's bottom right corner
* @constructor
* @memberof hat
*/
function SantaBeard(p, x1, y1, x2, y2) {
let width = x2 - x1;
let height = y2 - y1;
let x_offset = 0;
let y_offset = 0;
let img = p.loadImage('img/beard.png');
/**
* Method to draw the hat on a given surface
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.draw = function (surf) {
surf.image(img, x1 - x_offset, y1 - y_offset);
}
/**
* Method to draw the bounding box for debugging purposes
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.drawBox = function (surf) {
surf.noFill();
surf.strokeWeight(10);
surf.rect(x1, y1, width, height);
}
/**
* Resizing function that is run after the image is loaded to
* fit the bounding box appropriately
* Also sets the offsets for x and y so it is positioned correctly
*/
this.resize = function () {
img.resize(width, 0);
x_offset = 0
y_offset = -height * .65;
}
}
/**
* Represents a Top Hat image that can be drawn to a surface
* @see SantaHat
* @param p p5.js instance
* @param x1 {int} x-coordinate of the bounding box's top left corner
* @param y1 {int} y-coordinate of the bounding box's top left corner
* @param x2 {int} x-coordinate of the bounding box's bottom right corner
* @param y2 {int} y-coordinate of the bounding box's bottom right corner
* @constructor
* @memberof hat
*/
function TopHat(p, x1, y1, x2, y2) {
let width = x2 - x1;
let height = y2 - y1;
let x_offset = 0;
let y_offset = 0;
let img = p.loadImage('img/tophat.png');
/**
* Method to draw the hat on a given surface
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.draw = function (surf) {
surf.image(img, x1 - x_offset, y1 - y_offset);
}
/**
* Method to draw the bounding box for debugging purposes
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.drawBox = function (surf) {
surf.noFill();
surf.strokeWeight(10);
surf.rect(x1, y1, width, height);
}
/**
* Resizing function that is run after the image is loaded to
* fit the bounding box appropriately
* Also sets the offsets for x and y so it is positioned correctly
*/
this.resize = function () {
img.resize(width * 1.5, 0);
x_offset = width * .15
y_offset = height * 1.1;
}
}
/**
* Represents a Face Mask image that can be drawn to a surface
* @see SantaHat
* @param p p5.js instance
* @param x1 {int} x-coordinate of the bounding box's top left corner
* @param y1 {int} y-coordinate of the bounding box's top left corner
* @param x2 {int} x-coordinate of the bounding box's bottom right corner
* @param y2 {int} y-coordinate of the bounding box's bottom right corner
* @constructor
* @memberof hat
*/
function Mask(p, x1, y1, x2, y2) {
let width = x2 - x1;
let height = y2 - y1;
let x_offset = 0;
let y_offset = 0;
let img = p.loadImage('img/mask.png');
/**
* Method to draw the hat on a given surface
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.draw = function (surf) {
surf.image(img, x1 - x_offset, y1 - y_offset);
}
/**
* Method to draw the bounding box for debugging purposes
* @param surf {p5.Graphics} Surface to draw on. Must be a p5.Graphics object.
*/
this.drawBox = function (surf) {
surf.noFill();
surf.strokeWeight(10);
surf.rect(x1, y1, width, height);
}
/**
* Resizing function that is run after the image is loaded to
* fit the bounding box appropriately
* Also sets the offsets for x and y so it is positioned correctly
*/
this.resize = function () {
img.resize(width*.8, 0);
x_offset = -width*.1
y_offset = - height * .45;
}
}


Developing with PL/SQL in Optim Development Studio
With DB2 9.7 you can easily create and deploy your PL/SQL applications.
This article provides information about using Optim Development Studio to create,
edit, deploy, and debug PL/SQL routines for DB2 Linux, UNIX, and Windows (LUW) Version 9.7.


--- subject: "{{SUBJECT}}" --- {{> top }} {{> logo }} {{> greetings }} {{{{raw}}}} New Year. New You. Year {{ TODAY|year }} is all about making big changes. Start by changing your look with some of these styles. {{{{/raw}}}} {{> recommendation}} Shop Now {{> footer }}
Year {{ TODAY|year }} is all about making big changes. Start by changing your look with some of these styles.


!HTML p-//W3C//DTD HTML 4.01 Transitional//EN shttp://www.w3.o$ (HTML (HEAD (title "Title )title )HEAD (BODY (h1 "Header1 )h1 )BODY )HTML


File Viewer Resize Maximize Close
Uploaded Files
This is a for helping the user .
This is for settings if any.


--- layout: post status: publish published: true title: Italics Rendering in VS2010 Beta 1 author: display_name: Tomas Restrepo login: tomasr email<EMAIL_ADDRESS>url: http://winterdom.com/ author_login: tomasr author_email<EMAIL_ADDRESS>author_url: http://winterdom.com/ wordpress_id: 1239 wordpress_url: http://winterdom.com/2009/05/italics-rendering-in-vs2010-beta-1 date: '2009-05-21 03:39:02 +0000' date_gmt: '2009-05-21 03:39:02 +0000' categories: - Visual Studio tags: [] comments: - id: 810 author: Neil author_email<EMAIL_ADDRESS>author_url: '' date: '2009-05-21 10:47:58 +0000' date_gmt: '2009-05-21 10:47:58 +0000' content: It looks like the line spacing in VS2010 is slightly larger. I wonder if that's easy to change. - id: 812 author: James Alexander author_email<EMAIL_ADDRESS>author_url: http://jamesralexander.com date: '2009-05-21 12:09:15 +0000' date_gmt: '2009-05-21 12:09:15 +0000' content: "It looks like each line of code (non comment, non blank) is actually slightly larger in VS2010. I'm only going by what I'm seeing in your screen shots, using my screen capture tool that draws a line across the screen, but it seems that all lines are equal until the first code line: \"using System;\"\r\n\r\nPretty strange. Could it be a product of text rendering in WPF? If you use the normal fonts do you see the same behavior? (btw, love your font and VS themes!)" - id: 813 author: Tomas Restrepo author_email<EMAIL_ADDRESS>author_url: http://winterdom.com/ date: '2009-05-21 12:26:49 +0000' date_gmt: '2009-05-21 12:26:49 +0000' content: 'James: Yes, it''s weird. I just tried it with Consolas 12pt, and I see the same behavior: VS2008 shows 2 more lines than 2010. So it doesn''t appear to be related to the font used.' - id: 814 author: Tomas Restrepo author_email<EMAIL_ADDRESS>author_url: http://winterdom.com/ date: '2009-05-21 13:14:19 +0000' date_gmt: '2009-05-21 13:14:19 +0000' content: I've done a few more tests, and I've come to the conclusion that maybe I've got it backwards... maybe VS2010 is actually rendering Envy Code R in italics correctly. Still the old rendering seems to look a bit better to me :) - id: 816 author: Damien Guard author_email<EMAIL_ADDRESS>author_url: http://damieng.com date: '2009-05-21 18:08:55 +0000' date_gmt: '2009-05-21 18:08:55 +0000' content: "The situation here is that VS2010 beta 1 is rendering text via WPF which uses ideal widths and not GDI adjusted widths in order to enable sub-pixel positioning. This doesn't really make sense for monospaced fonts and the font rendering is very likely to change before RTM :)\r\n\r\n[)amien" - id: 987 author: Patrick author_email<EMAIL_ADDRESS>author_url: '' date: '2009-06-28 04:09:34 +0000' date_gmt: '2009-06-28 04:09:34 +0000' content: "With the ability for WPF to use open type font features, specifically tabular vs proportional alignment, perhaps a smart editor would make it possible to use proportional fonts for most of the code, and then set the alignment to tabular when trying to arrange multiple lines of text. Such as assignment statements.\r\n\r\nTake a look at http://msdn.microsoft.com/en-us/library/ms745109.aspx to see what I mean.\r\n\r\nAdditionally, I like the possibilities WPF will provide for scrunching more text on a line while keeping the font large, or scrunching more lines on the screen while keeping the font large. \r\n\r\nExcept for now it looks like it's giving us less. ha ha.\r\n\r\nI think a neat idea for an addon is something that would make the System.blah.blah small and then the last name in the string larger. For example, the Winterdom.IO. would be small and the FileMap could be large.\r\n\r\nIt's not really an issue on that example, but I've seen really long blah.blah.blah.blah.blah.somethingimportant that isn't even on the screen anymore code. This could fix that. A mouseover would expand the blahs to make them inspectable when necessary. a single click would make them stay big. a second click would make them small again." ---
A few people have asked questions about my comment on the rendering quality of italics fonts in Visual Studio 2010 Beta 1. To make the point clearer, here’s VS2010 side by side with VS2008, with the exact same code being displayed, using the same font (Envy Code R VS) at the same size:
If you look at the expanded view carefully, you should be able to spot some significant differences. For example, look at the rendering for letters like “e” and “t”. Of course, I can’t easily compare using another font, so that might be related (or not).
This screenshot did leave me with a question: How come VS2008 manages to display 2 lines more than VS2010, if both text editor windows are the same size and both are using the same font size?


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vhangup - virtually hangup the current terminal
#include <unistd.h>
int vhangup(void);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
vhangup():
Since glibc 2.21:
_DEFAULT_SOURCE
In glibc 2.19 and 2.20:
_DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
Up to and including glibc 2.19:
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
vhangup() simulates a hangup on the current terminal. This call arranges
for other users to have a “clean” terminal at login time.
On success, zero is returned. On error, -1 is returned, and errno is set
appropriately.
- EPERM
- The calling process has insufficient privilege to call vhangup();
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Contents
Introduction
%Aldous George %EP 501 %Project 1 %This code contains excerpts from the simple_elim_example provided by Dr. %Zettergen. %https://github.com/Zettergren-Courses/EP501_matlab/blob/master/... %linear_algebra/simple_elim_example.m clc clearvars close all
Problem 1
%a load testproblem.mat ForwardElim= SForwardElim(A,b,0); %b x=backsub(ForwardElim); disp('Elimination/back sub solution: '); disp(x); disp('Matlab,GNU/Octave built-in solution: '); disp(A\b); %c load lowertriang_testproblem.mat disp('Lower Triangular Matrix/forward substitution: '); TriForElim=LTriFowardrSub(L,bL); disp(TriForElim); %d verification disp('Matlab,GNU/Octave built-in solution: '); disp(L\bL); %Due to some unknown reason the solutions to Problem 1 appears at the very %end of the document.
Problem 2
disp('Problem 2'); %a %existing function works for multiple right-hand sides (RHS) %b %SimpleELim function load testproblem.mat SimpleElimination= SimpleElim(A,b); %Finding the Inverse of the matrix using Gausian Elimination Inv=SimpleElim(A,eye(8)); %Slicing the matrix into the A and A^(-1) Inverse = Inv(:,9); for ir=10:16 Inverse=cat(2,Inverse,Inv(:,ir)); end disp('Inverse/Gauss-Jordan Elimination: '); disp(Inverse); disp('Matlab,GNU/Octave built-in solution: '); disp(inv(A));
Problem 2 Inverse/Gauss-Jordan Elimination: Columns 1 through 7 -0.4480 0.3835 0.0281 -0.0881 -0.5795 1.0474 -0.5356 -0.0540 -0.1948 -0.2456 -0.6264 0.1978 -0.2692 0.2222 0.2062 -0.1064 -0.3766 -1.1154 -0.0220 0.5605 0.2837 -0.3250 0.4251 0.0724 -0.1670 -0.3128 0.8816 0.4305 -0.0697 -0.5582 -0.4000 -1.3059 0.0704 0.6537 0.8908 0.3565 0.3345 0.1079 -0.1491 0.2014 0.0363 -0.2920 -0.1222 0.1436 0.0008 0.7677 -0.2421 -0.0132 -0.1231 0.1043 -0.2818 -0.2839 -0.2878 0.4281 -0.1212 0.1503 Column 8 0.2581 0.2324 0.3873 0.2608 0.6467 -0.6463 -0.7433 0.0735 Matlab,GNU/Octave built-in solution: Columns 1 through 7 -0.4480 0.3835 0.0281 -0.0881 -0.5795 1.0474 -0.5356 -0.0540 -0.1948 -0.2456 -0.6264 0.1978 -0.2692 0.2222 0.2062 -0.1064 -0.3766 -1.1154 -0.0220 0.5605 0.2837 -0.3250 0.4251 0.0724 -0.1670 -0.3128 0.8816 0.4305 -0.0697 -0.5582 -0.4000 -1.3059 0.0704 0.6537 0.8908 0.3565 0.3345 0.1079 -0.1491 0.2014 0.0363 -0.2920 -0.1222 0.1436 0.0008 0.7677 -0.2421 -0.0132 -0.1231 0.1043 -0.2818 -0.2839 -0.2878 0.4281 -0.1212 0.1503 Column 8 0.2581 0.2324 0.3873 0.2608 0.6467 -0.6463 -0.7433 0.0735
Problem 3
disp('Problem 3'); [Amod,Det]=Gauss_elim(A,b); x2=backsub(Amod); disp('Determinant/Gauss-Jordan Elimination: '); disp(Det); disp('Matlab,GNU/Octave built-in solution: '); disp(det(A));
Problem 3 Determinant/Gauss-Jordan Elimination: -39.4247 Matlab,GNU/Octave built-in solution: -39.4247
Functions
%Simple Forward Elimination function [x] = SForwardElim(A,b,c) %SForwardElim Simple Forward Elimination % This function performs a simple forward elimination on a given square % matrix and its RHS % % A= LHS matrix % b= RHS matrix % c= 0 if matrix needs to be catenated, and 1 if matrix is already catenated. %The code used to write this function was written by Dr. Zettergen. Find it %at https://github.com/Zettergren-Courses/EP501_matlab/blob/master/... %linear_algebra/simple_elim_example.m nref=length(b); %size of system if c==0 Awork=cat(2,A,b); %Catenating A and B matrices elseif c==1 Awork=A; else fprintf('Please provide 0 if the matrix needs to be catenated or 1 if catenation is not required') end for ir1=2:nref %loop over rows from 2 to n performing elimination, this... %index marks what row we are starting the elimination from (i.e. using)... %for this particular column for ir2=ir1:nref %this index marks the present position where... %elimination is being performed - i.e. where we are applying the... %elementary row operations fact=Awork(ir2,ir1-1); %multiplier of the variable we are... %attempting to eliminate, its ir-1 column of this row Awork(ir2,:)=Awork(ir2,:)-fact/Awork(ir1-1,ir1-1).*Awork(ir1-1,:); %subtract off previous row modified by a factor that eliminates the... %ir-1 column term in this row (so it has only super-diagonal elements) end %for end %for x=Awork; end %function %backsub function as provided by Dr. Zettergen. %https://github.com/Zettergren-Courses/EP501_matlab/blob/master/... %linear_algebra/backsub.m function x=backsub(A) % This function performs back substitution on an upper triangular matrix that has % been modified by concatenating the RHS of the system. % Note that B is assumed to be upper triangular at this point. n=size(A,1); %number of unknowns in the system x=zeros(n,1); %space in which to store our solution vector x(n)=A(n,n+1)/A(n,n); %finalized solution for last variable,... %resulting from upper triangular conversion for ir1=n-1:-1:1 x(ir1)=A(ir1,n+1); %assume we're only dealing with a single... %right-hand side here. fact=A(ir1,ir1); %diagonal element to be divided through doing... %subs for the ir2 row for ic=ir1+1:n x(ir1)=x(ir1)-A(ir1,ic)*x(ic); end %for x(ir1)=x(ir1)/fact; %divide once at the end to minimize number of ops end %for end %function %Forward Substituion for Lower Triangle function x = LTriFowardrSub(A,b) % This function performs a forward elimination on a lower triangular % matrix and its RHS % % A= LHS matrix % b= RHS matrix %The code used to write this function was written by Dr. Zettergen. Find it %at https://github.com/Zettergren-Courses/EP501_matlab/blob/master/... %linear_algebra/simple_elim_example.m nref=length(b); %size of system Awork=cat(2,A,b); %Catenating A and B matrices x=zeros(nref,1); x(1)= Awork(1,nref+1)/Awork(1,1); %Finalised Solution for the first variable for ir=2:nref fact=Awork(ir,ir); %diagonal element x(ir)=Awork(ir,nref+1); %Assuming we're only dealing with 1 RHS for ic=1:ir-1 x(ir)=x(ir)-(Awork(ir,ic)*x(ic)); end %for x(ir) = x(ir)/fact; %Solution of respective variable end %for end %function %Simple Backward Elimination function [x] = SBackElim(A,b,c) %SBackElim Simple Back Elimination % This function performs a simple back elimination on a given square % matrix and its RHS % % A= LHS matrix % b= RHS matrix % c= 0 if matrix needs to be catenated, and 1 if matrix is already catenated. %The code used to write this function was modified from a code written by... %Dr. Zettergen. Find it at %https://github.com/Zettergren-Courses/EP501_matlab/blob/master/... %linear_algebra/simple_elim_example.m nref=length(b); %size of system if c==0 Awork=cat(2,A,b); %Catenating A and B matrices elseif c==1 Awork=A; else fprintf('Please provide 0 or 1 for third input') end for ir1=nref-1:-1:1 %loop over rows from 2 to n performing... %elimination, this index marks what row we are starting the elimination... %from (i.e. using) for this particular column for ir2=ir1:-1:1 %this index marks the present position where... %elimination is being performed - i.e. where we are applying the... %elementary row operations fact=Awork(ir2,ir1+1); %multiplier of the variable we are... %attempting to eliminate, its ir-1 column of this row Awork(ir2,:)=Awork(ir2,:)-fact/Awork(ir1+1,ir1+1).*Awork(ir1+1,:); %subtract off previous row modified by a factor that eliminates the... %ir-1 column term in this row (so it has only super-diagonal elements) end %for end %for x=Awork; end %function %Simple Elimination/Gaussian Elimination function [x] = SimpleElim(A,b) %SimpleElim % This function performs both a simple back elimination and a simple %forward eliminatio on a given square matrix and its RHS % % A= LHS matrix % b= RHS matrix %The code used to write this function was modified from a code written by %Dr. Zettergen. Find it at %https://github.com/Zettergren-Courses/EP501_matlab/blob/master/... %linear_algebra/simple_elim_example.m nref=length(b); %Sizing the matrix x = SForwardElim(A,b,0); %Using Simple Forward Elimination function x = SBackElim(x,b,1); %Using Simple Back Elimination function for ir=1:nref x(ir,:)=x(ir,:)/(x(ir,ir)); %Dividing through end end %function %Gauss elimination function as provided by Dr. Zettergen. %https://github.com/Zettergren-Courses/EP501_matlab/blob/master/linear_algebra function [Amod,Det]=Gauss_elim(A,b,verbose) % [Amod,ord]=Gauss_elim(A,b,verbose) % % This function perform elimination with partial pivoting and scaling as % described in Section 1.3.2 in the Hoffman textbook (viz. it does Gaussian % elimination). Note that the ordering which preserves upper triangularity % is stored in the ord output variable, such that the upper triangular output % is given by row-permuted matrix Amod(ord,:). The verbose flag can be set to % true or false (or omitted, default=false) in order to print out what the algirthm % is doing for each elimination step. %Parse the inputs, throw an error if something is obviously wrong with input data narginchk(2,3); if (nargin<3) verbose=false; end %if %Need to error check for square input. %Allocation of space and setup Amod=cat(2,A,b); %make a copy of A and modify with RHS of system n=size(A,1); %number of unknowns ord=(1:n)'; %ord is a mapping from input row being operated... %upon to the actual row that represents in the matrix ordering I=1; %Counter for number of pivots %Elimination with scaled, partial pivoting for matrix Amod; note all row %indices must be screen through ord mapping. for ir1=1:n-1 if (verbose) disp('Starting Gauss elimination from row: '); disp(ir1); disp('Current state of matrix: '); disp(Amod(ord,:)); end %if %check scaled pivot elements to see if reordering should be done pivmax=0; ipivmax=ir1; %max pivot element should never be higher than my... %current position for ipiv=ir1:n %look only below my current position in the matrix pivcurr=abs(Amod(ord(ipiv),ir1))/max(abs(Amod(ord(ipiv),:))); %note that columns never get reordered if (pivcurr>pivmax) pivmax=pivcurr; ipivmax=ipiv; %this stores the index into ord for row... %having largest pivot element I=I+1; %Counter for number of pivots end %if end %for %reorder if situation calls for it if (ipivmax ~= ir1) itmp=ord(ir1); ord(ir1)=ord(ipivmax); ord(ipivmax)=itmp; if (verbose) disp('Interchanging rows: '); disp(itmp); disp(' and: '); disp(ord(ir1)); disp('Current matrix state after interchange: '); disp(Amod(ord,:)); end %if end %if %perform the elimination for this row, former references to ir1 are now %mapped through the ord array for ir2=ir1+1:n fact=Amod(ord(ir2),ir1); Amod(ord(ir2),ir1:n+1)=Amod(ord(ir2),ir1:n+1)-fact/... Amod(ord(ir1),ir1).*Amod(ord(ir1),ir1:n+1); %only need columns ahead of where we are in matrix end %for if (verbose) disp('Following elimination for row: '); disp(ir1); disp(' matrix state: '); disp(Amod(ord,:)); end %if end %for Amod=Amod(ord,:); %Reordering the Matrix %Calculating the determinant Det=Amod(1,1); %Multiplying the diagonals for ic=2:n Det=Det*Amod(ic,ic); end %Sign correction for pivoting I=(-1)^I; Det=Det*I; end %function
Elimination/back sub solution: 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 Matlab,GNU/Octave built-in solution: 1.0000 2.0000 3.0000 4.0000 5.0000 6.0000 7.0000 8.0000 Lower Triangular Matrix/forward substitution: 1.0000 3.0000 5.0000 7.0000 9.0000 11.0000 13.0000 15.0000 Matlab,GNU/Octave built-in solution: 1.0000 3.0000 5.0000 7.0000 9.0000 11.0000 13.0000 15.0000


Access Control
Also known as Authorization
Authentication
vs
Authorization
Drupal core comes with a thin layer of authorization capabilities
Excerpt from Content Intake Functional Outline
A Contributor has a temporary account with permission to edit specifically assigned pages.
Drupal allows you to hook into access control
- hook_node_access()
- Grants - hook_node_access_records()
Out of scope for this training.
GCR has two use cases for access control
- The Contributor cannot revert changes once submitted for approval.
- A Contributor has a temporary account with permission to edit specifically assigned pages.
Two different authorization models
Contributed Modules
- workflow_access - only Drupal 7
- permissions_by_term - view only control
- tac_lite - full control: read, update, delete
Exercise
- Download tac_lite
- Enable and configure based on the README
- Manage access based on role
- Manage access based on individual user
Download theme with Composer
# Download the module from drupal packagist
$ composer require drupal/tac_lite
Export Configuration
# Change the Config Sync directory to something not ignored.
$ fin drush cex
Lunch!
When we get back:
- Drupal Automations
- Views / Maps
- Build out a page


Crazy Search
问题描述 :
Many people like to solve hard puzzles some of which may lead them to madness. One such puzzle could be finding a hidden prime number in a given text. Such number could be the number of different substrings of a given size that exist in the text. As you soon will discover, you really need the help of a computer and a good algorithm to solve such a puzzle.
Your task is to write a program that given the size, N, of the substring, the number of different characters that may occur in the text, NC, and the text itself, determines the number of different substrings of size N that appear in the text.
As an example, consider N=3, NC=4 and the text "daababac". The different substrings of size 3 that can be found in this text are: "daa", "aab", "aba", "bab", "bac". Therefore, the answer should be 5.
输入:
The first line of input consists of two numbers, N and NC, separated by exactly one space. This is followed by the text where the search takes place. You may assume that the maximum number of substrings formed by the possible set of characters does not exceed 16 Millions.
输出:
The program should output just an integer corresponding to the number of different substrings of size N found in the given text.
The first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.
The first line of a multiple input is an integer N, then a blank line followed by N input blocks. Each input block is in the format indicated in the problem description. There is a blank line between input blocks.
The output format consists of N output blocks. There is a blank line between output blocks.
样例输入:
1 3 4 daababac
样例输出:
5
主要思路：将出现的字符用nc进制的数来表示，保证其不会重复出现。。若有重复子字符串则这个数就相同，len-n+1 总的子字符串个数。。这个需要仔细观察。hash存储查找一遍重复的–最后就只剩下不重复的子字符串的个数了。
#include <stdio.h> #include <string.h> #define N 16000007 int hash[8000000],assi[27]; char str[N]; int a[N]; int main() { #ifndef ONLINE_JUDGE freopen("acm.txt","r",stdin); #endif int T,n,nc,len,k; int i,j,sum; scanf("%d",&T); while(T--) { memset(hash,0,sizeof(hash)); scanf("%d %d",&n,&nc); getchar(); scanf("%s",str); len=strlen(str); i=0; k=0; for(i = 0; i < len; i++) { a[i] = str[i] - 'a'; } i = 0; while(str[i]!='\0') { if(assi[a[i]]==0) assi[a[i]]=k++; if(k==nc) break; i++; } int cnt=len-n+1; for(i=0;i<len-n+1;i++) { sum=0; for(j=i;j<i+n;j++) { sum=sum*nc+assi[a[j]]; } sum%=N; if(hash[sum]==0) hash[sum]=1; else cnt--; } printf("%d\n",cnt); if(T>0) printf("\n"); } return 0; }
解题报告转自：http://blog.csdn.net/vsooda/article/details/8542653
(adsbygoogle = window.adsbygoogle || []).push({});
/*
* =====================================================================================
*
* Filename: 1366.cc
*
* Description:
*
* Version: 1.0
* Created: 2014年01月06日 14时52分14秒
* Revision: none
* Compiler: gcc
*
* Author: Wenxian Ni (Hello World~<EMAIL_ADDRESS>* Organization: AMS/ICT
*
* =====================================================================================
*/
#include
#include
using namespace std;
int main()
{
stack st;
int n,i,j;
int test;
int a[100001];
int b[100001];
while(cin>>n)
{
for(i=1;i>a[i];
for(i=1;i>b[i];
//st.clear();
while(!st.empty())
st.pop();
i = 1;
j = 1;
while(in)
break;
}
while(!st.empty()&&st.top()==b[j])
{
st.pop();
j++;
}
}
if(st.empty())
cout<<"YES"<<endl;
else
cout<<"NO"<<endl;
}
return 0;
}
great!
m /= i; 是一直在变的。参考这一篇关于质因数的http://www.acmerblog.com/integer-factorization-5124.html
嗯，是写错了，文中以更改。MAX ( L(X[0..m-2], Y[0..n-1]), L(X[0..m-1], Y[0..n-2])
有点意思
[…] 如果此题没有要求 相对位置不变，可以参考文章：http://www.acmerblog.com/interview-9-2427/ […]
从数学角度确实是C(n,r)，能给个递推关系式吗，从分治的角度不好理解
第二个方法挺不错。NewHead代表新的头节点，通过递归找到最后一个节点之后，就把这个节点赋给NewHead，然后一直返回返回，中途这个值是没有变化的，一边返回一边把相应的指针方向颠倒，最后结束时返回新的头节点到主函数。
约瑟夫也用说这么长……很成熟的一个问题了，分治的方法解起来o(n)就可以了，有兴趣可以看看具体数学的第一章，关于约瑟夫问题推导出了一系列的结论，很漂亮
简洁的代码
simple, however efficient. A lot of instances it is difficult to get that a??perfect balancea?? among usability and appearance. I must say that youa??ve done a exceptional task with this. Also, the blog masses quite fast for me on Web explore.
这个条件 “两个数的乘积最小”可以忽略


Upload your raw files as compressed gz fastq files for both paired-end mates. For example Sample1_R1.fastq.gz, Sample1_R2.fastq.gz.
Success
Please don't close this windown untill all the samples have been uploaded. Sometimes even if it is 100% you may need to wait until the files are completed transfered. TIP: Wait until the Stop Upload button is not visible.
Setup Samples
Upload new samples to the same project is very simple just follow the next steps:
Insert the number of samples you want to aggregate into your project.
Click GO or hit the enter key.
Fill the fields on the table and click on submit.
Wait until you receive an alert of success creating the samples.
TIP: This process only creates the sample environment, it does not process your data. To process you data, after you created the sample environment you need to go to Analyze Samples tab.


Bookings
Amusements of America offers your organization the opportunity to work in partnership with a proven, time-tested fundraiser. We serbice domestic markets acroiss texas
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| ID |
Story |
Involves Admin |
Involves Citizen |
Involves Member |
Priority |
Type |
Acceptance Tests |
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| US.17 |
As a Member I want to be able to perform
a basic search (containing only 1 key phrase) in less than 5 seconds so that
I can find PDFs I need before a meeting begins. |
|
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Yes |
MVP |
|
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Proposed |
| US.18 |
As a Citizen or Member I want to perform
an advanced search (containing several key phrases) in less than 10 seconds
so that I can get PDFs that match a very specific set of criteria. |
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Yes |
Yes |
MVP |
|
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Proposed |
| US.19 |
As a Citizen or Member I want to have
complete documentation of the search functionalities or query language so
that I can learn what I can do to have better searches. |
|
Yes |
Yes |
MVP |
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Proposed |
| US.21 |
As a Citizen or Member I want to be
guided through a complex search so that I can learn to use the more advanced
features of the search |
|
Yes |
Yes |
MVP |
|
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Proposed |
| US.22 |
As a Citizen I want to see a short
visualization of mention frequency when I perform a search so that I can
understand when a topic has gone stale or if it is currently highly
mentioned. |
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Yes |
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MVP |
|
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Proposed |
| US.5 |
As a Citizen or Member I want to view the
key information about the entity presented in a box to the right of search
results if the search matches an entity. (eg1. Member - Name, Role, Term
Start, Term End, Status, Email Address, Faculty, Job Title, committees sits
on etc. eg2: Committee - Name, Committee ID, Description, Committee
Coordinators Names Etc.) |
|
Yes |
Yes |
MVP |
|
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Proposed |
| US.20 |
As a Citizen or Member I want to be able
to access the system from a mobile device presented in a mobile-friendly
format so that it is more user-friendly. |
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Yes |
Yes |
MVP |
|
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Proposed |
| US.2 |
As a Member I want to be able to search
the full text of all PDFs so that I can find topics that are mentioned
anywhere in a document. |
|
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Yes |
MVP |
|
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Proposed |
| US.6 |
As an Admin I want to be able to add,
edit or remove PDFs so that I can control what information is accessible to
the public. |
Yes |
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MVP |
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Proposed |
| US.8 |
As a Citizen or Member I want to be able
see which committees a member sits on. |
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Yes |
Yes |
MVP |
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Proposed |
| US.9 |
As a Citizen or Member I want to be able
to make a search from the front page so that I can quickly find PDFs without
having to navigate menus. |
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Yes |
Yes |
MVP |
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Proposed |
| US.10 |
As a Citizen or Member I want to be able
to see synonyms and related topics to my search term. (eg1. ethics - moral,
justice, human rights; eg2: Adam - Did you mean Adam Brown or Adam Smith?) |
|
Yes |
Yes |
MVP |
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Proposed |
| US.11 |
As a Citizen or Member I want my
misspelled search term to be corrected so that I can find the correct topics
from any document. |
|
Yes |
Yes |
MVP |
|
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Proposed |
| US.12 |
As a Citizen or Member I want to
compensate for common input typing errors so that I can find the correct
topics from any document. (eg: plant - did you mean planet) |
|
Yes |
Yes |
Secondary |
|
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Proposed |
| US.13 |
As a Citizen or Member I want to be able
to see results that are related to the root word/derivative words of my
search term so that I can find the exact topic anywhere in a document. (eg.
ethics, ethical, ethically) |
|
Yes |
Yes |
Secondary |
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Proposed |
| US.1 |
As a Citizen I want to be presented with
a list of predefined searches so that I can answer questions without knowing
what is available to me yet. |
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Yes |
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Secondary |
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Proposed |
| US.14 |
As a Member I want to be able to get a
list of PDFs that will be relevant to my meetings today so that I can quickly
get up to speed for a meeting. |
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Yes |
Tertiary |
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Proposed |
| US.15 |
As a Citizen I want to be able to tell
the governance boards what sort of information I am looking for so that the
tools can be improved. |
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Yes |
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Tertiary |
|
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Proposed |
| US.16 |
As a Member or Admin I want to be able to
see some statistics about searches that are being made so that I know how the
tool is being used. |
Yes |
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Yes |
Tertiary |
|
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Proposed |
| US.3 |
As a Citizen I want to see a
visualization of topics so that I can understand which topics are important
or are currently being discussed. |
|
Yes |
|
Tertiary |
|
|
Proposed |
| US.7 |
As an Admin I want to be able to set
viewing permissions on a PDF so that I can control if a PDF can be seen by
only members or by members and the public. |
Yes |
|
|
Tertiary |
|
|
Proposed |
| US.4 |
As a Citizen I want to see a
visualization of committees and participants so that I can see who is in
charge of certain issues. |
|
Yes |
|
Tertiary |
|
|
Proposed |
|
|
|
|
|
|
|
|
|


Class JSONSchema
Extends
JSONInstance.
Defined in: jsv.js.
| Constructor Attributes | Constructor Name and Description |
|---|---|
|
JSONSchema(env, json, uri, schema)
This class binds a JSONInstance with a JSONSchema to provided context aware methods.
|
| Method Attributes | Method Name and Description |
|---|---|
|
getAttribute(key, arg)
Returns the value of the provided attribute name.
|
|
|
Returns all the attributes of the schema.
|
|
|
getLink(rel, instance)
Convenience method for retrieving a link or link object from a schema.
|
|
|
getReference(name)
Returns the value of the provided reference name.
|
|
|
Returns the schema of the schema.
|
|
|
setReference(name, uri)
Set the provided reference to the given value.
|
|
|
validate(instance, report, parent, parentSchema, name)
Validates the provided instance against the target schema and returns a Report.
|
- Methods borrowed from class JSONInstance:
- equals, getEnvironment, getProperties, getProperty, getPropertyNames, getType, getURI, getValue, getValueOfProperty, resolveURI
Class Detail
JSONSchema(env, json, uri, schema)
This class binds a JSONInstance with a JSONSchema to provided context aware methods.
- Parameters:
- {Environment} env
- The environment this schema belongs to
- {JSONInstance|Any} json
- The value of the schema
- {String} uri Optional
- The URI of the schema. If undefined, the URI will be a randomly generated uid.
- {JSONSchema|Boolean} schema Optional
- The schema to bind to the instance. If
undefined
, the environment's default schema will be used. Iftrue
, the instance's schema will be itself.
Method Detail
{JSONSchema|Any}
getAttribute(key, arg)
Returns the value of the provided attribute name.
This method is different from JSONInstance#getProperty as the named property is converted using a parser defined by the schema's schema before being returned. This makes the return value of this method attribute dependent.
- Parameters:
- {String} key
- The name of the attribute
- {Any} arg Optional
- Some attribute parsers accept special arguments for returning resolved values. This is attribute dependent.
- Returns:
- {JSONSchema|Any} The value of the attribute
{Object}
getAttributes()
Returns all the attributes of the schema.
- Returns:
- {Object} A map of all parsed attribute values
{String|Object|undefined}
getLink(rel, instance)
Convenience method for retrieving a link or link object from a schema.
This method is the same as calling
schema.getAttribute("links", [rel, instance])[0];
.
- Parameters:
- {String} rel
- The link relationship
- {JSONInstance} instance Optional
- The instance to resolve any URIs from
- Returns:
- {String|Object|undefined} If
instance
is provided, a string containing the resolve URI of the link is returned. Ifinstance
is not provided, a link object is returned with details of the link. If no link with the provided relationship exists,undefined
is returned.
{String}
getReference(name)
Returns the value of the provided reference name.
- Parameters:
- {String} name
- The name of the reference
- Returns:
- {String} The value of the provided reference name
{JSONSchema}
getSchema()
Returns the schema of the schema.
- Returns:
- {JSONSchema} The schema of the schema
setReference(name, uri)
Set the provided reference to the given value.
References are used for establishing soft-links to other JSONSchemas. Currently, the following references are natively supported:
References are used for establishing soft-links to other JSONSchemas. Currently, the following references are natively supported:
full
- The value is the URI to the full instance of this instance.
describedby
- The value is the URI to the schema of this instance.
- Parameters:
- {String} name
- The name of the reference
- {String} uri
- The URI of the schema to refer to
{Report}
validate(instance, report, parent, parentSchema, name)
Validates the provided instance against the target schema and returns a Report.
- Parameters:
- {JSONInstance|Any} instance
- The instance to validate; may be a JSONInstance or any JavaScript value
- {Report} report Optional
- A Report to concatenate the result of the validation to. If
undefined
, a new Report is created. - {JSONInstance} parent Optional
- The parent/containing instance of the provided instance
- {JSONSchema} parentSchema Optional
- The schema of the parent/containing instance
- {String} name Optional
- The name of the parent object's property that references the instance
- Returns:
- {Report} The result of the validation


Functions | |
| napi_value | stat_bucketc (napi_env env, napi_callback_info info) |
| napi_value | create_bucketc (napi_env env, napi_callback_info info) |
| napi_value | ensure_bucketc (napi_env env, napi_callback_info info) |
| napi_value | delete_bucketc (napi_env env, napi_callback_info info) |
| napi_value create_bucketc | ( | napi_env | env, |
| napi_callback_info | info | ||
| ) |
stat_bucket function is called from the javascript file create_bucket creates a new bucket. When bucket already exists it returns a valid Bucket and ErrBucketExists.
| napi_value delete_bucketc | ( | napi_env | env, |
| napi_callback_info | info | ||
| ) |
delete_bucket function is called from the javascript file delete_bucket deletes the bucket. When bucket is not empty it returns ErrBucketNotEmpty.
| napi_value ensure_bucketc | ( | napi_env | env, |
| napi_callback_info | info | ||
| ) |
ensure_bucket function is called from the javascript file ensure_bucket creates a new bucket and ignores the error when it already exists. When bucket already exists it returns a valid Bucket and ErrBucketExists.
| napi_value stat_bucketc | ( | napi_env | env, |
| napi_callback_info | info | ||
| ) |
stat_bucket function is called from the javascript file stat_bucket returns information about a bucket.


--- layout: default Title: Coach parking in Bath Breadcrumb1_title: Parking & Travel Breadcrumb1_url: section-parking.html ---
Bath has no secure coach parking facilities within the City Centre. All coaches must drop off and pick up passengers at Riverside Coach Park.
Coach drivers can use one of the secure coach parking site below after all passengers have been dropped off.


Interface Resource
A resource.
Resources are objects which can be stored in a resource repository. Resources have a path, under which they are stored in the repository.
Depending on the implementation, resources may offer additional functionality:
* Resources that are similar to files in that they have a body and a size should implement Puli\Repository\Api\Resource\BodyResource
.
Resources can be attached to a repository by calling Puli\Repository\Api\Resource\Resource::attachTo()
. They
can be detached again by calling Puli\Repository\Api\Resource\Resource::detach()
. Use Puli\Repository\Api\Resource\Resource::isAttached()
to find out whether a resource is attached and Puli\Repository\Api\Resource\Resource::getRepository()
to
obtain the attached repository.
You can create a reference to a resource by calling Puli\Repository\Api\Resource\Resource::createReference()
.
References can have different paths than the resource they are referencing.
Otherwise, they are identical to the referenced resource. Use
Puli\Repository\Api\Resource\Resource::isReference()
to check whether a resource is a reference. You can
call Puli\Repository\Api\Resource\Resource::getRepositoryPath()
to retrieve the path of the referenced
resource.
If you implement a custom resource, let your test extend AbstractResourceTest to make sure your resource satisfies the constraints of the interface. Extend GenericResource if you want to avoid reimplementing basic functionality.
- Puli\Repository\Api\Resource\Resource implements Serializable
Direct known implementers
Puli\Repository\Api\Resource\BodyResource, Puli\Repository\Api\Resource\FilesystemResource, Puli\Repository\Resource\GenericResource, Puli\Repository\Resource\LinkResourceIndirect known implementers
Puli\Repository\Resource\AbstractFilesystemResource, Puli\Repository\Resource\DirectoryResource, Puli\Repository\Resource\FileResourceAuthor: Bernhard Schussek<EMAIL_ADDRESS>Since: 1.0
Located at Api/Resource/Resource.php
public
string|null
|
|
public
string|null
|
|
public
|
|
public
boolean
|
|
public
boolean
|
|
public
|
|
public
|
|
public
|
|
public
string|null
|
|
public
|
#
attachTo(
Attaches the resource to a repository. |
public
|
|
public
boolean
|
|
public
static
|
|
public
boolean
|
serialize(),
unserialize()
|


By Charles Ornstein, ProPublica
Nov. 8, 2012
Long after power is restored from Sandy, the effect of another more-precarious outage is still taking shape: Some of the largest hospitals
in lower Manhattan remain shuttered. Other hospitals are scrambling to fill the gap, and concern is rising that the patchwork system
can't last for long.
NYU Langone Medical Center and Bellevue Hospital, the flagship of the city's public hospital system, were forced to evacuate due to loss
of electricity and damage from Sandy. The Manhattan Veterans Affairs Medical Center evacuated patients before the storm and has not
reopened.
There is no firm timetable on the hospitals' return. A spokesman for the city agency that runs Bellevue said that the hospital will likely
be out for at least several weeks. NYU's outpatient clinics have reopened but the hospital itself remains closed.
"This is not a tenable situation," said Bellevue's director of emergency medicine, Dr. Lewis Goldfrank, who holds a similar title at NYU.
"There's just too many people. You can't dump this level of patients out on the open market."
Bellevue's emergency room treated more than 100,000 patients last year, and its physicians and outpatient clinics handled more than a half million patient visits, according to state Department of Health data. It is also a large provider of psychiatric services and a hub for treating patients in police custody.
Beyond the huge daily patient load it handles, Bellevue is also a key piece of the city's crisis response system as the only high-level trauma center near the lower section of Manhattan. Trauma centers handle the most serious cases, including victims of gunshots, stabbings, auto accidents, falls and terrorist attacks.
Read more of the story on ProPublica [link: http://www.propublica.org/article/new-yorks-ongoing-blackout-hospitals-in-lower-manhattan]
Jennifer LaFleur contributed to this report.
More stories from ProPublica
A Patient's Guide: How To Stay Safe In a Hospital [link: http://www.propublica.org/article/a-patients-guide-how-to-stay-safe-in-a-hospital]
Resource: Three Ways To Tell Your Patient Harm Story [link: http://www.propublica.org/article/resource-three-ways-to-tell-your-patient-harm-story]
When Harm in the Hospital Follows You Home [http://www.propublica.org/article/when-harm-in-the-hospital-follows-you-home]


Fill out the information below to calculate your households energy consumption. This will give you the number of solar panels that you need for your house and calulate when your investment pays off.
Want to know what solar panels are all about? Read our blog post on Solar Panels 101 to find out more.


This class does unzipping the httpfiles.zip which are loaded additionally to the app. httpfiles.zip can contain files like Announcements or something else which are not statically linked to the app, but are static files.
| File | common/lib/httpfiles_unzip.h |
| Classes |
Httpfiles_unzipItem Httpfiles_unzip |
Internal class. For every file in the zip folder there is httpfiles_unzipItem.
class Httpfiles_unzipItem : public istd::listElement<httpfiles_unzipitem>
{
class httpfile * file;
byte * data;
char * path;
public:
Httpfiles_unzipItem(char * filePath, byte * fileData, size_t fileLength);
~Httpfiles_unzipItem();
};
Used to unzip the file. Used in the app-main.cpp after the AppService is started
class Httpfiles_unzip {
class IInstanceLog * log;
void ScanFiles(class IDirectory * dir, char * absoluteFilePath, char * filePath);
void ReadFile(char * path, char * name);
class istd::list<Httpfiles_unzipItem>listItems;
public:
Httpfiles_unzip(class IInstanceLog * log, const char * appName);
~Httpfiles_unzip();
};
Contructor.
| class IInstanceLog * log | Used for Logging. |
| const char * appName | Name of the app. |


This class wraps the implementation of the runCommand service.
More...
#include <ros_interpreter.hh>
|
| typedef boost::function< bool(dynamic_graph_manager::RunCommand::Request &, dynamic_graph_manager::RunCommand::Response &)> | run_python_command_callback_t |
| | run_python_command_callback_t define a boost::function to be used as callback to the ros::service. More...
|
| |
| typedef boost::function< bool(dynamic_graph_manager::RunPythonFile::Request &, dynamic_graph_manager::RunPythonFile::Response &)> | run_python_file_callback_t |
| | run_python_file_callback_t define a boost::function to be used as callback to the ros::service. More...
|
| |
|
| | RosPythonInterpreter (ros::NodeHandle &node_handle) |
| | RosPythonInterpreter is the unique constructor of the class. More...
|
| |
|
| ~RosPythonInterpreter () |
| | ~RosPythonInterpreter is the default destructor of the class
|
| |
| void | run_python_command (const std::string &command, std::string &result, std::string &out, std::string &err) |
| | run_python_command used the python interpreter to execute the input command More...
|
| |
| void | run_python_file (const std::string ifilename, std::string &standard_error) |
| | run_python_file executes the input scripts in the python interpreter More...
|
| |
|
void | start_ros_service () |
| | start_ros_service advertize the "run_python_command" and "run_python_scripts" ros services
|
| |
|
| bool | runCommandCallback (dynamic_graph_manager::RunCommand::Request &req, dynamic_graph_manager::RunCommand::Response &res) |
| | runCommandCallback is the "run_python_command" ros service callback function. More...
|
| |
| bool | runPythonFileCallback (dynamic_graph_manager::RunPythonFile::Request &req, dynamic_graph_manager::RunPythonFile::Response &res) |
| | runCommandCallback is the "run_python_script" ros service callback function. More...
|
| |
|
|
dynamicgraph::python::Interpreter | interpreter_ |
| | interpreter_ is the python interpreter itself
|
| |
|
ros::NodeHandle & | ros_node_handle_ |
| | ros_node_handle_ is reference to the ros::NodeHandle used to advertize the ros::services
|
| |
| ros::ServiceServer | run_python_command_srv_ |
| | run_python_command_srv_ is the "run_python_command" ros::service c++ object More...
|
| |
| ros::ServiceServer | run_python_file_srv_ |
| | run_python_file_srv_ is the "run_python_script" ros::service c++ object More...
|
| |
This class wraps the implementation of the runCommand service.
This takes as input a ROS node handle and do not handle the callback so that the service behavior can be controlled from the outside.
◆ run_python_command_callback_t
run_python_command_callback_t define a boost::function to be used as callback to the ros::service.
The first argument of "runCommandCallback" (const std::string & command) is bound to (dynamic_graph_manager::RunCommand::Request). And the second argument (std::string &result) is bound to (dynamic_graph_manager::RunCommand::Response)
◆ run_python_file_callback_t
run_python_file_callback_t define a boost::function to be used as callback to the ros::service.
The first argument of "runPythonFileCallback" (std::string ifilename) is bound to (dynamic_graph_manager::RunCommand::Request). And a fake second argument is simulated in (dynamic_graph_manager::RunCommand::Response)
◆ RosPythonInterpreter()
| dynamic_graph::RosPythonInterpreter::RosPythonInterpreter |
( |
ros::NodeHandle & |
node_handle | ) |
|
|
explicit |
RosPythonInterpreter is the unique constructor of the class.
- Parameters
-
| node_handle | is the ros::nodeHandle used to advertize the ros::services |
◆ run_python_command()
| void dynamic_graph::RosPythonInterpreter::run_python_command |
( |
const std::string & |
command, |
|
|
std::string & |
result, |
|
|
std::string & |
out, |
|
|
std::string & |
err |
|
) |
| |
run_python_command used the python interpreter to execute the input command
- Parameters
-
| [in] | command | is the user input string command. |
| [out] | result | is the numerical result of the operation done. |
| [out] | out | is the string representation of the results. |
| [out] | err | is the output error string from python. |
◆ run_python_file()
| void dynamic_graph::RosPythonInterpreter::run_python_file |
( |
const std::string |
ifilename, |
|
|
std::string & |
standard_error |
|
) |
| |
run_python_file executes the input scripts in the python interpreter
- Parameters
-
| ifilename | is the path to the script to execute |
◆ runCommandCallback()
| bool dynamic_graph::RosPythonInterpreter::runCommandCallback |
( |
dynamic_graph_manager::RunCommand::Request & |
req, |
|
|
dynamic_graph_manager::RunCommand::Response & |
res |
|
) |
| |
|
protected |
runCommandCallback is the "run_python_command" ros service callback function.
- Parameters
-
| req | is the request. it is defined as a string in the RunCommand.msg |
| res | is the request. it is defined as a string in the RunCommand.msg |
- Returns
- true
◆ runPythonFileCallback()
| bool dynamic_graph::RosPythonInterpreter::runPythonFileCallback |
( |
dynamic_graph_manager::RunPythonFile::Request & |
req, |
|
|
dynamic_graph_manager::RunPythonFile::Response & |
res |
|
) |
| |
|
protected |
runCommandCallback is the "run_python_script" ros service callback function.
- Parameters
-
| req | is the request. it is defined as a string in the RunCommand.msg |
| res | is the request. it is defined as a string in the RunCommand.msg |
- Returns
- true
◆ run_python_command_srv_
| ros::ServiceServer dynamic_graph::RosPythonInterpreter::run_python_command_srv_ |
|
private |
run_python_command_srv_ is the "run_python_command" ros::service c++ object
This kind of ros object require NOT to be destroyed. otherwize the ros::service is cancelled. This is the reason why this object is an attribute of the class
◆ run_python_file_srv_
| ros::ServiceServer dynamic_graph::RosPythonInterpreter::run_python_file_srv_ |
|
private |
run_python_file_srv_ is the "run_python_script" ros::service c++ object
This kind of ros object require NOT to be destroyed. otherwize the ros::service is cancelled. This is the reason why this object is an attribute of the class
The documentation for this class was generated from the following files:


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The Halvorson Family Website
Hello! We're the Halvorsons, Jenifer and Isaac. We currently live in Minneapolis, MN. Thanks for visiting our site!
Jenifer is a high school science teacher, currently teaching at AGAPE High School in Saint Paul, MN.
Isaac is the site's webmaster. He's a software developer, currently doing iOS development for Q3 Contracting, a construction company in Little Canada, MN. You can visit Isaac's homepage for information about him.


INNOCENT BLOOD A film review by Ken Johnson Copyright 1992 Ken Johnson
120 min., R, Horror, 1992 Director: John Landis Cast: Anne Parillaud, Robert Loggia, Anthony LaPaglia, Kim Coates, Leo Burmester, Don Rickles, Sam Raimi, Frank Oz, Alfred Hitchcock, Dan Quale (yes, the Vice President)
Anne Parillaud is a vampire who is running out of food. She always makes sure that her victims don't turn into vampires by finishing off the body. Parillaud turns to Italians as her next food source.  Loggia comes back from the dead and sets off to make an undead mob force. Parillaud joins with cop Anthony LaPaglia to stop Loggia.
 It has now left all the theaters in my area (I saw it on the last night it was playing) and will probably soon be doing the same in other cities.  INNOCENT BLOOD is rated R for explicit language, adult situations, graphic violence, and female nudity.
Anne Parillaud, mostly a foreign film actress, does a good job. Robert Loggia gives a great and evil performance. Anthony LaPaglia does well in his role. Kim Coates (I seem to remember seeing him in this year's other vampire film BUFFY THE VAMPIRE SLAYER), also does a good job. There are many cameo performances in this film. Frank Oz shows up briefly as a mortician, Alfred Hitchcock, in a clip from one of his old films, and Dan Quale, in a television appearance. Director John Landis, who has brought forth such films as AN AMERICAN WEREWOLF IN LONDON and NATIONAL LAMPOON'S ANIMAL HOUSE has created a great movie, which actually made me jump once (which I normally don't do).
The eye effects were great. I loved how the eyes changed colors, it created a haunting image at some points. The special effects in general were outstanding. The bite wounds looked sickening and the vampire changeover facial effects were perfect. The film was very well written and didn't fall into too many vampire cliches. The film also did a good job with not portraying all vampires as vicious freaks. It said that some vampires have a sense of what is bad.
-------- Ken Johnson<EMAIL_ADDRESS>.
The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
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