text stringlengths 49 10.4k | source dict |
|---|---|
php, wordpress
//Option to turn off align-self: center;
if( get_field( 'center' ) == false ) {
$center = ' center-self';
}
//Opening Div - determines if class or inline for padding
if( $inlineStyle ) {
echo '<section class="' . join( ' ', $classes ) . '"' . esc_attr($anchor) . ' ' . esc_attr($inlineStyle) . '... | {
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electrostatics, electric-fields, conductors
Title: Confusion in least action in the following situation
I understand that when electric field is applied normal to the surface of a conductor the net electric field inside the conductor is zero.
But as shown in the diagram above, if electric field is not normal to the s... | {
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function κ --> 2<sup>κ</sup> is exactly provided by <a href="http://en.wikipedia.org/wiki/Easton%27s_theorem" rel="nofollow">Easton's Theorem</a>. This remarkable theorem states that if you have any class function E, defined on the regular cardinals κ, with the properties that </p> <ul> <li>κ &l... | {
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"openwebmath_score": 0.949590802192688,
"tags":... |
navigation, kinect, turtlebot, pointcloud-to-laserscan, amcl
Title: Pointcloud_to_laserscan ranges angular min and max?
The pointcloud_to_laserscan package in the turtlebot stack provides the cloud_to_scan.cpp nodelet. This program defines the laserscan angular field of view from -90 degrees to +90 degrees (180 total... | {
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"tags": "navigation, kinect, turtlebot, pointcloud-to-laserscan, amcl",
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} |
c, file
int cpy(char *cpy_buf, FILE *src_file, FILE *dest_file) {
size_t num_elements;
while((num_elements = fread(cpy_buf, sizeof(char), sizeof(cpy_buf), src_file)) > 0) {
if(fwrite(cpy_buf, sizeof(char), num_elements, dest_file) != num_elements) {
fprintf(stderr, "\nError while writing to... | {
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skid-steer, gazebo-model, gazebo-plugin, sdformat
Title: Skid Steer Drive Plugin unable to find joints when it is included in a sdf
Hi,
I am creating a new robot model, to do so I include the mobile platform and the sensors in the robot's sdf.
When I add this robot an SkidSteerDrivePlugin error[1] appears saying it i... | {
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quantum-mechanics, schroedinger-equation, harmonic-oscillator, dimensional-analysis
Here's an explanation:
You didn't go through the substitutions, so here's a brief overview of the process of solving it. You can check each stage to make sure that you see what exactly is happening to the dimensions of the equation. St... | {
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newtonian-gravity, orbital-motion
$$
So this shows that equation $\text{(11)}$ is true and equation $\text{(5)}$ is equivalent to Kepler's equation. Your equation is equivalent to Kepler's equation, just in terms of true anomaly $\theta$ instead of eccentric anomaly $E$. Read more about it here.
$\tan \frac{\theta}{2}... | {
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"tags": "newtonian-gravity, orbital-motion",
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quantum-mechanics, hilbert-space, angular-momentum
Title: What happened to the basis of 1⊗1/2 when we write 1/2⊗1? I am doing an exercise of calculating the Clebsch-Gordan (CG) coefficient of $\frac{1}{2}\otimes 1 =\frac{3}{2} \oplus \frac{1}{2}$. Without realizing that the general convention is to have $j_1 > j_2$, I... | {
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"tags": "quantum-mechanics, hilbert-space, angular-momentum",
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} |
navigation, gmapping
Title: Problems with navigation stack
I have a map of the area, in which I want my differential drive mobile robot to move around to the goals given, for this I already mapped the area with kinect using the gmapping, now I want to use the navigation stack.
I have followed the setup as mentioned i... | {
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"tags": "navigation, gmapping",
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navigation, raspberrypi, ros-kinetic, robot-localization
Title: Low update rate on robot_localization
I am using ROS kinetic, Raspbian 9.4 (Stretch) on a Raspberry Pi 3. I am equipping a miniature vehicle (similar to the image below, image from google) for autonomous driving.
So far my I have an IMU and encoders i... | {
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"tags": "navigation, raspberrypi, ros-kinetic, robot-localization",
"url": null
} |
c#, multithreading
Title: Simple asynchronous operation implementation Could you please see if they are no bugs in this implementation? I am especially interested in knowing if there could be here any multithreading problems (such as race conditions).
It is written in C# for .NET 3.5.
public interface IAsyncOperation... | {
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# Apply Green's theorem for $\iint_D (x+2y)dxdy$ on region bounded with $x = t- \sin (t), y = 1 - \cos (t)$.
Basically, I am stuck with his exercise. It asks to compute the integral:
$$\int_C P\,dx + Q\,dy = \iint_D \left(\frac{\partial Q}{\partial x} - \frac{\partial P}{\partial y}\right)dxdy = \iint_D (x+2y)dxdy$$ ... | {
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classical-mechanics, energy-conservation
Notice that we have basically three stages. In the beginning, we accelerate rather rapidly up to nearly optimal speed. Then in the middle portion we travel at nearly optimal speed in order to cover ground, and then at some point, we coast to reduce our speed, and finally brak... | {
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• You for $v_x=0$. What does that imply about $u_x,u_y,v_y$? – N. S. Jul 9 '14 at 12:58
• Ouch. So $u=c_1,v=c_2\quad (c_{1,2}\in\mathbb{C})$ ? but that's a constant function (not sure whether they asked for a linear function with incline $\neq 0$). Thanks. – user65985 Jul 9 '14 at 13:05 | {
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fft, signal-analysis, radar, mimo
Those coordinates are found by creating separate axes for both TX and RX group. And, the reference points i.e. origins of those axes are determined so that a suitable virtual antenna array is formed by naming each virtual antenna group as $TX_{m}-RX_{n}$ as in the figure in your quest... | {
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What this means is $2^2$ (which is $4$) is $1$ greater than some multiple of $3$ (that multiple, in this case is obviously, $3$)
So if $2^2\equiv 1 ~~~(\text{mod } 3)~~\implies (2^2)^n\equiv (1)^n ~~~(\text{mod } 3)\implies 2^{2n}\equiv 1~~(\text{mod } 3)$,
Again, this means that any even power of $2$ is $1$ greater t... | {
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turing-machines, simulation
Title: Convert a non-deterministic Turing machine into a deterministic Turing machine How can we systematically convert a non-deterministic Turing machine into a deterministic Turing machine that recognizes the same language? The deterministic machine simulates all possible computations of ... | {
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$$X_t = \left\{ \begin{array}{ll} e^{\lambda t} &\mbox{ if t < Y} \\ 0 & \mbox{ if t \geq Y} \end{array} \right.$$ Thus, $X_t$ increases exponentially until it crosses the random threshold $Y$, at which point it (discontinuously) jumps down to $0$ and stays there. Since $Y$ is finite with probability 1, we know with pr... | {
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"openwebmath_score": 0.9996914863586426,
"tag... |
NArgMax[ { NExpectation[ \[FormalX] * Boole[ \[FormalX] == i], \[FormalX] \[Distributed] negativeHypergeometricDistribution[ 1, 4, 52 ] ], 1<= k<= 49 }, k ∈ Integers ] 13 With[ { dist = negativeHypergeometricDistribution[ 1, 4, 52 ] }, Panel @ DiscretePlot[ Evaluate@ Expectation[ \[FormalX] * Boole[ \[FormalX] == i ], ... | {
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"openwebmath_perplexity": 2416.923694968831,
"openwebmath_score": 0.994888186454773,
"tags... |
star, nebula, star-formation
Title: Will new stars stop forming at some point of time? New stars keep forming in the universe thanks to all the nebulae. Now, we need Hydrogen to form stars and there would a time when all the hydrogen will get exhausted, and no more star formation will take place, theoretically.
Will t... | {
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ros
Another note is that I have skipped sudo apt-get updateand just added the ROS sources list manually to software and updates
So how exactly do you expect apt-get to know where to find packages then?
Also: apt-get update does not touch any packages. It just downloads the index.
Comment by sam26 on 2017-02-28:
So, w... | {
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fft, audio, frequency, frequency-response, measurement
The input signals I am using are sine sweeps and white noise. Both results in very similar results. The same applies to the audio amplifier I am using, switching to a different one changed nothing. I therefore do not believe these two to be the issue.
I wonder now... | {
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python, feature-selection, random-forest, python-3.x, gridsearchcv
Title: Feature Importance from GridSearchCV I created a GridSearchCV for a Random Forest Regressor. Now I want to check the feature importance. I searched around and I found this:
rf_gridsearch.best_estimator_.named_steps.feature_importances_
This alr... | {
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"url": n... |
homework-and-exercises, quantum-field-theory, kinematics
I don't understand how this integral over $z$ comes out. If the Matrix amplitude does not have a $z$ dependence, the integral just becomes 2 and gives expected result; but I still do not get how this is derived.
ii) Apparently $$\frac{\delta(Q-E_1-E_2-E_3)}{2E_3... | {
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"tags": "homework-and-exercises, quantum-field-theory, kinematics",
"url": null
} |
mass, heisenberg-uncertainty-principle
Title: Can mass be uncertain? If you can have uncertainty in momentum, then wouldn't you have uncertainty in mass and velocity?
Why can't mass be uncertain? Uncertainty is a property of observables. Mass is not normally taken to be an observable, so it does not obey uncertainty r... | {
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"tags": "mass, heisenberg-uncertainty-principle",
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homework-and-exercises, electromagnetism, special-relativity, electric-fields, inertial-frames
Expansion of the first term on the R.H.S. reveals a leading term proportional to $\mathbf{v}$ and parallel to $\mathbf{v}$.
Expansion of the second term on the R.H.S. reveals a leading term proportional to $\mathbf{v^2}$ and... | {
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ros, ros2, ament, c++11
ament_package()
Originally posted by arunavanag on ROS Answers with karma: 277 on 2017-09-11
Post score: 0
Original comments
Comment by William on 2017-09-11:
Please do not post pictures of text. Please post the text. Also, please do not cross post questions. We see both sites in our notifica... | {
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fft
Title: Why does this constant-Q transform "lose octaves"? In this paper (Schörkhuber, Klapuri, Sontacchi), it's shown that the constant Q-transform evaluated "octave-wise" produces the following looking graph:
I don't understand why the octaves are "disappearing" in some time intervals. Isn't this then a lossy" p... | {
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"tags": "fft",
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electrons, pauli-exclusion-principle
Title: Pauli exclusion principle in an electron beam Do electrons in an electron beam (cathode ray) follow the Pauli exclusion principle? Or in other words, does the Pauli exclusion principle apply for the beam of electrons? A cathode ray tube where the electrons are randomly eject... | {
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pcl, pcl-ros
Originally posted by clark on ROS Answers with karma: 393 on 2012-03-15
Post score: 0
Original comments
Comment by karthik on 2012-03-19:
Hey i noticed that you haven't set your ros path for this unstable version before compiling it. I see "/home/robot/ros/perception_pcl/pcl_ros/build" in your error whic... | {
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• @Asaf: that is not the suggestion. The suggestion is the following: pick an arbitrary inner product $\langle v, w \rangle$. Construct the new inner product $\langle v, w \rangle_G = \int_G \langle gv, gw \rangle \, dg$. (There is some work necessary to prove that this is still an inner product but it's not so bad.) B... | {
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$$\ \frac {\sqrt{(\sqrt{4x-3}-1})} {\sqrt{2}} = y$$
He said that to do the problem to had to complete the squares, any information as to why he is wrong and you are right or you are both right for different reasons or whats up?
Last edited: Feb 18, 2010
6. Feb 17, 2010
### Dick
I'm impressed with the Facebook Physi... | {
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Perhaps the following solution using the in-and-out formula is slightly less tedious.
For $1\le i\le13$ let $A_i$ be the set of all $7$-card hands containing an exact pair of rank $i.$ $$|A_i|=\binom42\binom{48}5.$$ $$|A_i\cap A_j|=\binom42\binom42\binom{44}3\text{ for }i\lt j.$$ $$|A_i\cap A_j\cap A_k|=\binom42\binom... | {
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ros, driver, joint-state-publisher, ur5
log file: /home/robotlabpc/.ros/log/a1eeed26-3dac-11e3-8aa7-0013d41b020f/ur_driver-2*.log | {
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"url": null
} |
(and later on:) Formally, $\lim_{x\rightarrow\infty}f(x)=l$ means that for every $\varepsilon>0$ there is a number $N$ such that, for all $x$, \begin{align*} \text{if }x>N\text{, then }|f(x)-l|<\varepsilon\text{.} \end{align*}
and we find as exercise 36 a new definition and the following two out of three sub-points
E... | {
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"openwebmath_score": 0.9814448356628418,
"ta... |
why n does not equal -1
ask a complete question if you want a complete answer.
Andrew
I agree with Andrew
Bg
f (x) = a is a function. It's a constant function.
proof the formula integration of udv=uv-integration of vdu.?
Find derivative (2x^3+6xy-4y^2)^2
no x=2 is not a function, as there is nothing that's changing.
ar... | {
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"tags... |
electric-circuits, electric-current, voltage, complex-numbers, linear-systems
how is the calculations simplified?
The ODE we want to solve ($L\ddot{Q}+R\dot{Q}+C^{-1}Q=V$ with $L,\,R,\,C^{-1},\,V$ real-valued) is linear, and the most general real solution is the real part of the most general complex solution (possibl... | {
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"tags": "electric-circuits, electric-current, voltage, complex-numbers, linear-systems",
... |
the fourth number is 1 + 2 = 3, the fifth number is 2 + 3 = 5, and so on. x n = x n − 1 + x n − 2. The Fibonacci sequence $\langle f_n \rangle$ starts with $f_1=1$ and $f_2=1$. So, at the end of the year, there will be 144 pairs of rabbits, all resulting from the one original pair born on January 1 of that year. Relate... | {
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"lm_q2_score": 0.8479677660619633,
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"openwebmath_score": 0.5943748950958252,
"tags"... |
is the horizontal distance traveled in twice the time it takes for an object to reach its maximum. We'll also describe how to export the arranged plots to a file. These skills will instead fire a payload arrow into the air to land at a targeted location. You can change the default reference point for most scaling metho... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9674102542943773,
"lm_q1q2_score": 0.8082553430694286,
"lm_q2_score": 0.8354835391516133,
"openwebmath_perplexity": 546.204366958955,
"openwebmath_score": 0.5885403752326965,
"tags": n... |
• "when Newton's Method converges, it does so quadratically" ...as long as the derivative of the function is nonzero at the root.
– user856
Apr 10 '16 at 1:47
• Right, forgot that little detail (been quite some time since I dealt with the Newton-Raphson Method), Apr 10 '16 at 1:49 | {
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object-oriented, vba, unit-testing, rubberduck, battleship
Private Function GetDefaultDestroyer() As IShip
Set GetDefaultDestroyer = Ship.Create(ShipNameDestroyer, 2, Horizontal, GridCoord.Create(1, 1))
End Function
I'm not 100% convinced this is the best place to put the ship names and default ships. Based on my... | {
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"tags": "object-oriented, vba, unit-testing, rubberduck, battleship",
"url": null
} |
pytorch, gan, generative-models, convolutional-neural-network, gaussian
Title: What is a latent space vector? I do not understand this about GANs.
Apparently the Generator is supposed to receive a latent space vector as its input. Yet I couldn't find an example of how I can implement it in Pytorch. This is a problem f... | {
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"tags": "pytorch, gan, generative-models, convolutional-neural-network, gaussian",
"ur... |
json, delphi
function JsonEncode(const S: String): String;
var
X: Integer;
C: Char;
procedure Repl(const Val: String);
begin
Delete(Result, X, 1);
Insert(Val, Result, X);
end;
begin
Result:= StringReplace(S, '\', '\\', [rfReplaceAll]);
Result:= StringReplace(Result, '"', '\"', [rfReplaceAll]);
... | {
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"openwebmath_score": null,
"tags": "json, delphi",
"url": null
} |
c#, vba, rubberduck, antlr
return base.VisitEndStmt(context);
}
public override ExtractMethodValidationResult<VBAParser.BlockStmtContext> VisitExitStmt([NotNull] VBAParser.ExitStmtContext context)
{
if (_qualifiedSelection.Selection.Contains(context))
{
... | {
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"tags": "c#, vba, rubberduck, antlr",
"url": null
} |
ros, gazebo, gdb
Thanks.
Originally posted by 130s on ROS Answers with karma: 10937 on 2011-08-16
Post score: 0
It looks like Ubuntu doesn't allow you to attach to an arbitrary process. See https://wiki.ubuntu.com/SecurityTeam/Roadmap/KernelHardening#ptrace%20Protection and http://blog.mellenthin.de/archives/2010/10... | {
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python, python-2.x, json, stackexchange
Note: This code and its companion C++ project are now available in a github repo. My answer's short because I don't see much wrong with it, but this is what I think:
In fetch_compressed_data(), you define data when all you do with it is return it. You should just do return ...... | {
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"tags": "python, python-2.x, json, stackexchange",
"url": null
} |
php, wordpress
<? } ?>
<?php wp_reset_postdata(); /* restore original post data */ ?>
</div>
</section>
<?php // repeat many blocks like the 'section' above ?> First off, Wordpress is an awful platform when it comes to separation of business logic from display logic. If you expect to continue working in it, you ... | {
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"tags": "php, wordpress",
"url": null
} |
electromagnetism, magnetic-fields, electric-fields
Title: How any material can provide electrostatic and magnetic shielding Several metallic objects like Iron, Copper etc can provide electrostatic shielding (one should remain inside the car during thunderstorm) and several superconductors like HTS (High Temperature Su... | {
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"tags": "electromagnetism, magnetic-fields, electric-fields",
"url": null
} |
java, swing, simulation, graphics, physics
Instead of calling Math.sqrt() in Particle.getDistance() and then squaring the result in Particle.getRejectionForce(), you should give your Particle class a getDistanceSquared(Particle other) method that directly returns the squared distance.
In your simulator class, you firs... | {
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"tags": "java, swing, simulation, graphics, physics",
"url": null
} |
\ ( ( ;! Y-Axis and class boundaries along the x-axis defining characteristics of Gothic architecture is most! Miles per gallon ) for 428 vehicle models a scale of 2 cm = 10 workers on y-axis.! A reply to your comment or update on this website is not in any way affiliated with any of first... To include the frequency t... | {
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"lm_q2_score": 0.8539127492339909,
"openwebmath_perplexity": 1240.4348948347993,
"openwebmath_score": 0.5637276768684387,
"tags"... |
c++, algorithm, random, c++17, binary-tree
node = value <= node->value ?
node->left.get() : node->right.get();
}
parent->insert_child( value );
}
[[nodiscard]] auto next( const std::size_t& min, const std::size_t& max ) const -> std::size_t
{
... | {
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"tags": "c++, algorithm, random, c++17, binary-tree",
"url": null
} |
ros
log file: /home/user/.ros/log/5fc1b9c4-efbe-11e7-82f4-1c1b0d9a79ac/gripper-controller_spawner-5*.log | {
"domain": "robotics.stackexchange",
"id": 29644,
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"tags": "ros",
"url": null
} |
mass-spectrometry
> is needed by
> L"Z:\\home\\swacker\\software\\proteowizzard\\msparser.dll") not found
> err:module:import_dll Library api-ms-win-crt-heap-l1-1-0.dll (which is
> needed by L"Z:\\home\\swacker\\software\\proteowizzard\\msparser.dll")
> not found err:module:import_dll Library api-ms-win-crt-math-l1-1-... | {
"domain": "bioinformatics.stackexchange",
"id": 833,
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"openwebmath_score": null,
"tags": "mass-spectrometry",
"url": null
} |
sql, .net, sql-server, asp.net, vb.net
In this case, 2 and 3 should have the verb edited rate to (because there's a TrackRateID that's less than their TrackRateID) and 1 should have the verb entered rate of. (There is, of course, no guarantee that the "first" row will actually have an ID of 1).
Here's my ASP.NET front... | {
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"tags": "sql, .net, sql-server, asp.net, vb.net",
"url": null
} |
beginner, php, sql, mysqli, db2
//Close Connections
if (mysqli_close($mysqlConn)){
echo "MySQL Closed";
}
$PDO = null;
$stmt = null;
?> I have a few observations from looking at your code. Some of them are related to the PHP code, some of them are related to the SQL. Some of these observations may also help you ... | {
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"tags": "beginner, php, sql, mysqli, db2",
"url": null
} |
quantum-mechanics, quantum-spin
Title: Stern-Gerlach-Experiment with j=1 atoms? Suppose you do a Stern-Gerlach experiment with atoms in a $j=1$ state. There would be three separate beams ($m_j = -1, 0, 1$) coming out of the apperatus. But what would be the relative distribution of atoms in these beams?
On first though... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-spin",
"url": null
} |
javascript, promise, ecmascript-6
Title: Check if images are loaded (ES6 Promises) I wrote a small function that checks if an image or multiple images are loaded. For that purpose, I decided to use ES6 promises, but I'm not really sure if my way of handling errors is the best way.
const loadImg = function loadImg(src)... | {
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"tags": "javascript, promise, ecmascript-6",
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} |
python, python-3.x, console, linux, installer
return config
def write_config(cfg, destination):
"""
Save the unit configuration file to the destination.
"""
config = configparser.ConfigParser()
config.optionxform = str
config['Unit'] = cfg.Unit
config['Service'] = cfg.Service
if cfg.I... | {
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"tags": "python, python-3.x, console, linux, installer",
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Poles of transfer function are eigenvalues of A Pole locations a ect system response repeated eigenvalues. However, the geometric multiplicity can never exceed the algebraic multiplicity. • Roy’s Largest Root = largest eigenvalue o Gives an upper-bound of the F-statistic. This will be one of the few times in this chapt... | {
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"lm_q1_score": 0.9888419697383903,
"lm_q1q2_score": 0.8591323757389555,
"lm_q2_score": 0.868826771143471,
"openwebmath_perplexity": 450.8891887879132,
"openwebmath_score": 0.8856151103973389,
"tags"... |
experimental-physics
Title: Comparing observed gradient Just working through an experiment to find G, and I have been asked to compare my observed gradient and constant with the expected values.
I was wondering what is generally considered acceptable to use as a comparison? Is the p value the best measure? It is good ... | {
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} |
np-hard, sets
Algorithm 2: Linear programming Consider the following LP relaxation: there is a variable $0 \leq x_i \leq 1$ for every vertex, and a constraint $x_i + x_j \geq 1$ for every edge $(i,j)$. Find a solution minimizing $\sum_i x_i$, and take all vertices such that $x_i \geq 1/2$. This is clearly a vertex cov... | {
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"openwebmath_score": null,
"tags": "np-hard, sets",
"url": null
} |
z-transform, interpolation, control-systems, decimation, multirate
Title: Multirate Control System Transfer Functions I'm interested in oversampling the inputs to a digital controller to increase the SNR of the input process variable signal. I've read on this site and in articles like the one below that it is not accu... | {
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"tags": "z-transform, interpolation, control-systems, decimation, multirate",
"url": null
} |
Where $0\le{p}\le1$.
Example.
## Rolling a dice
Suppose we keep rolling a fair dice until we observe $3$ sixes in total. What is the probability that we roll a six for the $3$rd time at the $8$th roll?
Solution. Let's treat the event of observing a $6$ as a success. Since we have a fair dice, the probability of suc... | {
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"lm_q2_score": 0.8221891327004133,
"openwebmath_perplexity": 867.6148738711636,
"openwebmath_score": 0.9365339875221252,
"tags": ... |
mechanical-engineering, electric-vehicles, regenerative-braking
Title: Does an electric vehicle going downhill recover energy? I have to model the behavior of an electric car. For this, I use these equations and I can observe by "playing" with parameters that, when going downhill at constant speed, the car has a negat... | {
"domain": "engineering.stackexchange",
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"tags": "mechanical-engineering, electric-vehicles, regenerative-braking",
"url": null... |
We claim that $$A\leq B$$. Suppose not. Then we have $$A>B$$. Let $$\varepsilon=\frac{A-B}{2}$$. Since $$A$$ is the limit of $$(a_n)$$, there exists $$M\in\mathbb{Z}$$ such that for all $$n\geq M$$, we have $$|a_n-A|<\varepsilon$$. Similarly, since $$B$$ is the limit of $$(b_n)$$, there exists $$N\in\mathbb{Z}$$ such t... | {
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"lm_q1_score": 0.9802808681480852,
"lm_q1q2_score": 0.8211028188741769,
"lm_q2_score": 0.8376199572530449,
"openwebmath_perplexity": 47.421486928191776,
"openwebmath_score": 0.9921726584434509,
"ta... |
telescope, space, space-telescope
Title: Which space telescope is the most distant? From the earth, and from the sun. Only interested in active, operational ones. Currently New Horizions is temporarily hibernating; it's last activity was two months ago. So I'm going to post a supplementary answer here because it is "o... | {
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"tags": "telescope, space, space-telescope",
"url": null
} |
java, simulation
// Cashier serves in average in 15 seconds, s.d. 2 seconds.
Cashier cashier = Cashier.withRandom(random)
.withMeanServiceTime(15.0)
.withStandardDeviationOfServiceTime(2.0);
System.out.println("Seed = " + seed);
... | {
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"tags": "java, simulation",
"url": null
} |
Main content
L'Hôpital's rule introduction
AP Calc: LIM‑4 (EU), LIM‑4.A (LO), LIM‑4.A.1 (EK), LIM‑4.A.2 (EK)
Video transcript | {
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"openwebmath_score": 0.8825176954269409,
"tags":... |
It's the same criterion for sequences and for series. So let $(u_n)$ be a Cauchy sequence. Proving it has a limit goes through the following steps:
• We associate to $(u_n)$ two sequences: $(a_n)=(\inf\limits_{p\ge n}u_p)$ and $(b_n)=(\sup\limits_{p\ge n}u_p)$.
• Show $(a_n)$ is non-decreasing and $(b_n)$ is non-incre... | {
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"openwebmath_score": 0.9041002988815308,
"tag... |
rosdep, ros-fuerte, debian
Since the version brackets are empty, I'm guessing that rosdep doesn't acurately recognizes the OS Override. Is there another flag I can set?
Originally posted by NsN on ROS Answers with karma: 95 on 2012-07-28
Post score: 5
ROS_OS_OVERRIDE does not (seem to) affect rosdep install. I don'... | {
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"openwebmath_score": null,
"tags": "rosdep, ros-fuerte, debian",
"url": null
} |
ros-kinetic
Title: Is the “template” a member of the SubscribeOptions?
In the source code of node_handle.h, Line 252, ops.template init<M>(topic, queue_size);
The link is http://docs.ros.org/lunar/api/roscpp/html/node__handle_8h_source.html#l00249.
I don't understand why the developer wrote ops.template. To my unders... | {
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"tags": "ros-kinetic",
"url": null
} |
measurement, information-theory, entropy, povm
\qquad M_2=I-M_1.$$
Then
$$\rho_1 = \frac{\sqrt M_1 \rho \sqrt M_1}{p_1} =\frac12\begin{pmatrix}1&0\\0&1\end{pmatrix}, \quad p_1=2\epsilon.$$
It follows that in this case $S(\rho)\simeq0$ but $S(\rho_1)=1$.
If you want to know what this would look like in practice, you ca... | {
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"tags": "measurement, information-theory, entropy, povm",
"url": null
} |
quantum-mechanics, condensed-matter, curvature, graphene, berry-pancharatnam-phase
This is the same as equation 2 in Xiao's paper. This is as far as I've gotten with this derivation and it's all I needed for the work that I was doing. In addition to your solution which explicitly derives the eigenstates in details, I ... | {
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"tags": "quantum-mechanics, condensed-matter, curvature, graphene, berry-pancharatnam-phase... |
r, dataset, data-cleaning, categorical-data
do this:
dam2 = reshape2::dcast(
dplyr::mutate(
reshape2::melt(dam,id.var="name"),
value=plyr::mapvalues(
value, c("yes","no"),c("OK","notOK"))
),name~variable)
get that:
> dam2
name re1 re2 re3
1 a OK OK OK
2 b notOK notO... | {
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"tags": "r, dataset, data-cleaning, categorical-data",
"url": null
} |
= x^{a-b}$$$$\frac{1}{x^b }= x^{-b}$$$$(x^a)^b=x^{a.b}$$$$(xy)^a= x^a .y^a$$$$x^0=1$$$$\sqrt{xy}=\sqrt{x} .\sqrt{y}$$$$(-1)^n=-1$$, if n is odd.$$(-1)^n=+1$$, if n is even.If \(0 Hillbilly Tomato Seeds, Kite Properties And Formulas, Chhota Bheem World Racing Championship Game, New Belgium Store, Enai Noki Paayum Thota ... | {
"domain": "patriciabarber.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.972414716174355,
"lm_q1q2_score": 0.8284514402923351,
"lm_q2_score": 0.8519528000888387,
"openwebmath_perplexity": 5085.975984019032,
"openwebmath_score": 0.5125997066497803,
"tag... |
terminology, quantum-entanglement
Title: Noun for particles that are quantumly entangled What will we call particles that are in a "quantum entanglement" kind of relationship?
not looking for examples (like thingamatrons can participate theoretically in quantum entanglement); rather the noun part / nomenclature
like t... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "terminology, quantum-entanglement",
"url": null
} |
machine-learning-model, q-learning
Title: Exploration in Q learning: Epsilon greedy vs Exploration function I am trying to understand how to make sure that our agent explores the state space enough before exploiting what it knows. I am aware that we use epsilon-greedy approach with a decaying epsilon to achieve this. ... | {
"domain": "datascience.stackexchange",
"id": 9491,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning-model, q-learning",
"url": null
} |
beginner, game, bash, console, tic-tac-toe
I do not know much about bash
You might be that future maintenance engineer.
Be kind to your future self.
And thank you for that nice shebang.
true
get_placement() {
while :
Please don't do that.
The Bourne shell has a long and sordid history
which involves various (alm... | {
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"id": 45551,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, game, bash, console, tic-tac-toe",
"url": null
} |
javascript, jquery
is equivalent to:
$(".SerieNr select").change(function () {
Applying these you get:
function alreadyExists(serieNrBox, serienr) {
return serieNrBox.children().is(function () {
return $(this).val() === serienr;
});
}
$("#BestelRegels").find(".BestelRegel").each(function(index, order... | {
"domain": "codereview.stackexchange",
"id": 9671,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery",
"url": null
} |
ros, roslib, arm-navigation
Title: move_arm_warehouse package
I've rebuilt ros from sources completely and I don't think it's my installation, but the python script in the move_arm_warehouse package
<move_arm_warehouse>./scripts/create_launch_files.py
uses the following code
directoryName = roslib.packages.is_pkg_di... | {
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"openwebmath_score": null,
"tags": "ros, roslib, arm-navigation",
"url": null
} |
homework-and-exercises, quantum-field-theory, mass, field-theory, propagator
$$
Mathematica will also handle the final $k$-integral
$$
I = \frac{4 \pi^2 m}{x} K_1(m x) \ .
$$
If we expand out the Bessel-K function for large argument, we find the desired exponential behavior
$$
I = e^{-m x} \left( \pi^{5/2} m^{1/2} \l... | {
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"tags": "homework-and-exercises, quantum-field-theory, mass, field-theory, propagator",
"... |
c++, design-patterns
This is because the compiler will generate default versions of these. Under normal situations the default versions work. But when you start messing with memory management they usually need to be defined to work together (deep copy problem).
In this case Subject has a compiler generated copy constr... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, design-patterns",
"url": null
} |
java, android, asynchronous
LogCat
08-07 08:56:29.378: E/AndroidRuntime(13918): FATAL EXCEPTION: main
08-07 08:56:29.378: E/AndroidRuntime(13918): java.lang.IllegalStateException: Cannot execute task: the task is already running.
08-07 08:56:29.378: E/AndroidRuntime(13918): at android.os.AsyncTask.executeOnExecutor... | {
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"id": 4294,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, android, asynchronous",
"url": null
} |
simulation
# parameters
w01 = 1
w12 = 4
g02 = 0.01
g12 = 0.01
gamma01 = 0.01
gamma12 = 0.01
phi = 0 # angle between drives
# operators
a02 = qp.Qobj([[0, 0, 1], [0, 0, 0], [0, 0, 0]])
a12 = qp.Qobj([[0, 0, 0], [0, 0, 1], [0, 0, 0]])
a01 = qp.Qobj([[0, 1, 0], [0, 0, 0], [0, 0, 0]])
H0 = qp.Qobj(np.diag([0, w01, w01 ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "simulation",
"url": null
} |
quantum-mechanics
Title: Double slit experiment - Is there a 1/2^n chance for an unobserved single particle to create non interference pattern? n is the number of shots made While shooting the electrons individually, considering the probability to be 50/50 for each firing, there would be a single chance that all the e... | {
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"tags": "quantum-mechanics",
"url": null
} |
not be in my best interest to ask professor. Use our google custom search here red } \ \ \text { 0 is the smallest odd number. (. + 2 \times 11^n \ ) be used to prove that P ( n ) is true for all >. Color } \color { red } \ \ \text { 0 is the smallest number... ( 5^n + 2 \times 11^n \ ) the sequence a n = 1, i.e 4^n + ... | {
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"lm_name": "Qwen/Qwen-72B",
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"lm_q1q2_score": 0.8083893201841182,
"lm_q2_score": 0.8397339756938818,
"openwebmath_perplexity": 801.9683889375204,
"openwebmath_score": 0.7480453848838806,
... |
This is a special case of the general property of sequences that the sum of two convergent series converges to the sum of their limits.
-
Hm... I guess i have to take that, although I'd love to see a proof for that property ;) – iolo Nov 1 '11 at 11:25
@iolo. Suppose $a_n \to a$ and $b_n \to b.$ Then by definition, f... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9706877675527112,
"lm_q1q2_score": 0.8024790175073276,
"lm_q2_score": 0.8267117855317474,
"openwebmath_perplexity": 229.70386409128236,
"openwebmath_score": 0.981260359287262,
"tag... |
while True:
P1_wins+=1
break
P2_wins+=1
break
return P1_wins/N, P2_wins/N
a,b = sim(1000000)
• When you toss a coin until $r$ failures and then look at the distribution of the number of successes that happen before finishing such experiment, then this is by definition negative binomial distribution. – Tim Jan 20 '1... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9770226327661524,
"lm_q1q2_score": 0.8435531541877302,
"lm_q2_score": 0.8633916205190226,
"openwebmath_perplexity": 641.0520303166695,
"openwebmath_score": 0.7927042245864868,
"tag... |
newtonian-mechanics, classical-mechanics, angular-momentum, rotational-dynamics, rotational-kinematics
$$ \mathbf{COM}(\theta) = \pmatrix{
\frac{ m_b c - m_t \ell \cos \theta}{m_b + m_t} \\
\frac{ - m_t \ell \sin \theta}{m_b + m_t} }
$$
such that with $c = \frac{m_t}{m_b} \ell$ and $\theta =0$ the COM is at the o... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, classical-mechanics, angular-momentum, rotational-dynamics, r... |
python, programming-challenge, interview-questions, matrix, ascii-art
Title: Print concentric rectangular patterns I am solving interview questions from here.
Problem : Print concentric rectangular pattern in a 2d matrix. The outermost rectangle is formed by A, then the next outermost is formed by A-1 and so on. You ... | {
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"tags": "python, programming-challenge, interview-questions, matrix, ascii-art",
"url"... |
c, linked-list
ll->head = NULL;
ll->tail = NULL;
return ll;
error:
return NULL;
}
/**
* Add an item to the linked list in the head or the tail
*
* @param ll
* @param data
* @param type
* @return int (will be 1 for failure and 0 for sucess)
*/
LinkedListNode *LLAddBase(LinkedList *ll, void *data,... | {
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"tags": "c, linked-list",
"url": null
} |
## Output
The sum of series till 7 is 1260
This approach is not efficient as it takes time complexity of the order of N.
Another approach is using the mathematical formula for the sum of series. As we have discussed in the problem description, the series can be said the summation of (n)*(n+1)*(n+2).
Using this info... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773708019443872,
"lm_q1q2_score": 0.8267994345549502,
"lm_q2_score": 0.8459424334245617,
"openwebmath_perplexity": 2008.3006649353229,
"openwebmath_score": 0.6622426509857178,
"t... |
newtonian-mechanics, energy, harmonic-oscillator, spring
Title: Does changing the mass affect velocity if the amplitude stays the same? There's a block of mass $M$ connected to a spring of negligible mass. This is set up horizontally, and there is no friction between the block and the surface. The block oscillates wit... | {
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, energy, harmonic-oscillator, spring",
"url": null
} |
is the expansion of $f$ in the basis $A = \{a_1, \dots,a_n \}$ of $V^*$; that is,
$x = (x_1, x_2, . . . , x_n)^T = (f_1, f_2, . . . , f_n)^T. \tag{4}$
In the light of (4) we have, since
$M_{ij} = a_j(b_i), \tag{5}$
that
$(Mx)_i = \sum_jM_{ij}x_j = \sum_j a_j(b_i)x_j = \sum_j a_j(b_i)f_j$ $= \sum_j f_ja_j(b_i) = (\... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9848109503004294,
"lm_q1q2_score": 0.8119391374490459,
"lm_q2_score": 0.8244619306896956,
"openwebmath_perplexity": 98.06195043798071,
"openwebmath_score": 0.994860827922821,
"tags... |
training, cross-validation
Title: K-Fold cross validating with random forest - how to correctly fit model to every fold? So I have created K-Folds from my data using this code:
X = rfedata.drop(['target'],axis=1)
Y = rfedata['target']
kf = KFold(n_splits=10)
KFold(n_splits=10, random_state=None, shuffle=False)
for t... | {
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"id": 10286,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "training, cross-validation",
"url": null
} |
the domain and range of a function implied by a word problem with this free video math lesson. On the other. Include a description of the kinds of numbers in the domain as well as any limitations on their values. These high quality math worksheets are delivered in a PDF format and includes the answer keys. Essentially,... | {
"domain": "cefalugibilmanna.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.971563966131786,
"lm_q1q2_score": 0.842380693226348,
"lm_q2_score": 0.8670357512127872,
"openwebmath_perplexity": 429.69633344663407,
"openwebmath_score": 0.6847590804100037,
... |
c, interpreter, brainfuck, c99
can be simplified to just:
return (SourceFile) {buffer, lSize};
Noise:
const serves no purpose with const SourceFile readSourceFile in the declaration const SourceFile readSourceFile(const char* filePath). It is ignored.
Send error messages to stderr:
if (argc < 2) {
// puts("Er... | {
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"openwebmath_score": null,
"tags": "c, interpreter, brainfuck, c99",
"url": null
} |
Thus, $a_n \equiv 3 \mod 4$ for all $n$.
To the main part.
If $a_n \equiv 3 \mod 5$, then $a_{n+1} = a_n^{a_n} \equiv 3^{a_n} \mod 5$ is all you can say using the fact that $a_n \equiv 3 \mod 5$. But note that $3^{4} \equiv 1 \mod 5$, so you can now say that $a_{n+1} \equiv 3^{(a_n \mod 4)} \mod 5$.
But the point is... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9833429609670702,
"lm_q1q2_score": 0.8453442943269557,
"lm_q2_score": 0.8596637469145053,
"openwebmath_perplexity": 94.97374565202487,
"openwebmath_score": 0.9394116997718811,
"tag... |
newtonian-mechanics, newtonian-gravity, orbital-motion, conservation-laws, inertial-frames
Title: Kepler problem in time: how do two gravitationally attracted particles move? Two particles with initial positions and velocities $r_1,v_1$ and $r_2,v_2$ are interacting by the inverse square law (with G=1), so that
$$ {d^... | {
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"id": 3509,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, newtonian-gravity, orbital-motion, conservation-laws, inertial... |
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