text stringlengths 1 1.11k | source dict |
|---|---|
logarithm function by composing it with the absolute value function. $$1)$$ $$f(x)=log(x)$$ Graphing Logarithmic Functions Flip Book This flip book was created to be used as a stations activity to provide extra practice with graphing logarithmic functions and identifying the domain, range, x-intercept, asymptotes, and ... | {
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"lm_q1q2_score": 0.8331707039596543,
"lm_q2_score": 0.8397339716830605,
"openwebmath_perplexity": 725.7880205007357,
"openwebmath_score": 0.6196134090423584... |
regular-languages, finite-automata, formal-grammars, regular-expressions
Title: Regular expression for a palindrome of finite length? I have a language $$ L = \{ww^R, w \in \{ab\}^5\}$$
I know this is a regular language because it is finite (since w can only be of length 5). I want to prove it's a regular language, so... | {
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"tags": "regular-languages, finite-automata, formal-grammars, regular-expressions",
"url": nul... |
algorithms, sudoku
In fact yes, your shift operator is simply circulant matrix, scattering boxes. Since circulant matrix always abide rules by row and column but not by box, you use permutation (scattering scheme), which now abide all rules, it will produce a subset of possible grids, let us call it $G$.
Now mapping $... | {
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"tags": "algorithms, sudoku",
"url": null
} |
java, ros-fuerte, rosjava, osx
Linking CXX executable bin/mylib
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
"google::protobuf::DescriptorPool::generated_pool()", referenced from:
protobuf::protobuf_AssignDesc_maverick_5fcmd_2eproto() in maverick_cmd.pb.o
"google::prot... | {
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"openwebmath_score": null,
"tags": "java, ros-fuerte, rosjava, osx",
"url": null
} |
thermodynamics, statistical-mechanics, temperature, ideal-gas, volume
Let's look at Charles law (P held constant)
If we were to increase the temperature of the molecules, their kinetic energy would increase and would therefore hit the piston with greater force and increase the volume of the piston until the internal a... | {
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"tags": "thermodynamics, statistical-mechanics, temperature, ideal-gas, volume",
"url": n... |
python, performance, python-2.x, iterator, iteration
classes = {}
backupClasses = {}
selectedClasses = {}
var = Vars()
var.SendVars("color", 30)
def makeDatabase():
for i in range(0, len(RawClassData)): # Parse through each class
sys.stdout.write("\rLoading classes: " + str( float("{0:.2f}".format(( floa... | {
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"tags": "python, performance, python-2.x, iterator, iteration",
"url": null
} |
mobile-robot
First, you need to transform the body-frame angular rates into world-frame angular rates. To do that, simply pre-multiply the body rates by the current rotation matrix:
$\omega_o = R \omega_b$
Where $\omega_o = \begin{bmatrix} \omega_{o,x} \\ \omega_{o,y} \\ \omega_{o,z}\end{bmatrix}$ are the world-frame ... | {
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"tags": "mobile-robot",
"url": null
} |
target, and hence makes the connection in only one direction. In simple words, no edge connects two vertices belonging to the same set. A complete graph is a graph in which every vertex has an edge to all other vertices is called a complete graph, In other words, each pair of graph vertices is connected by an edge. Bot... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9719924810166349,
"lm_q1q2_score": 0.8035576478044673,
"lm_q2_score": 0.8267117940706734,
"openwebmath_perplexity": 330.4676212645372,
"openwebmath_score": 0.5810887813568115,
"tags": nul... |
java, algorithm, clustering
private static PointPair calcPointPair(Point[] points, int low, int high) {
assert points != null;
if ((high - low) <= BRUTEFORCE_INDEX) {
return bruteForce(points, low, high);
}
int mid = (low + high) / 2;
final PointPair leftPair = c... | {
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"openwebmath_score": null,
"tags": "java, algorithm, clustering",
"url": null
} |
javascript, lodash.js
"available": 1,
"backOrder": "",
"channelId": 1,
"photoGroupId": 7075044,
"colorId": 159942,
"swatchImageUrl": "",
"size": "5X",
"color": "Navy",
"width": null,
"value": "",
"price": "$50.00",
"choiceGroup": "Tall",
"isHolidayAvailable": true,
"isSameDayDeliveryAvailable... | {
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"openwebmath_score": null,
"tags": "javascript, lodash.js",
"url": null
} |
c
if (file == NULL)
goto error;
while ((n = fread(buffer, sizeof(char), sizeof(buffer), file)) > 0) {
if (data == NULL) {
data = malloc(sizeof(char) * n);
data_cursor = data;
data_size = n;
} else {
// We compute the position in the buffer as... | {
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"tags": "c",
"url": null
} |
javascript, php, html
Please take a minute to browse through the following code and let me know your thoughts.
The Solution
The general concept is that individual queries will be stored in individual includes files and will be reloaded periodically using javascript.
index.php
<!DOCTYPE HTML> | {
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"tags": "javascript, php, html",
"url": null
} |
python, python-3.x, tkinter
Title: Simple image segmentation app I often segment images by hand to generate training data for machine learning models. To this end, I created a little TkInter app that displays images and allows me to export labeled polygons to JSON. I'm looking for feedback on the design of the project... | {
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"tags": "python, python-3.x, tkinter",
"url": null
} |
c#, generics
Title: Refactoring my windowsFormApp code I have around 150 lines of code that I managed to optimize.
But, because my two methods and the six if-statements almost are identical, could there be room for improvement? Maybe it could be done with only one button and one listbox?
As I'm out of ideas and coul... | {
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"tags": "c#, generics",
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python, strings, comparative-review
account_id_tag = ""
if account_id:
account_id_tag = "<accountId>"+account_id+"</accountId>"
account_id_tag = "<accountId>"+account_id+"</accountId>" if account_id else ""
And so I think the last is the simplest.
If you use this a lot, then it'd be best to make this a function.... | {
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"tags": "python, strings, comparative-review",
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#### Global Convergence Under Lipschitz Continuity
Let $f \in C_L^{1, 1}(\mathbb R^n)$ and let $(x^k)_k$ be the sequence generated by the gradient method with one of the following step size strategies:
• constant step size $\overline \alpha \in (0, \frac{2}{L})$
• exact line search
• Armijo line search (backtracking)... | {
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"openwebmath_perplexity": 513.060857223317,
"openwebmath_score": 0.989271879196167,
"tags": null,
... |
c, game, ms-dos
/* Allow the user to reject or accept the board. */
while (1) {
printf("Accept board? Y/N "); fflush(stdout);
input = getche();
printf("\n");
input = toupper(input);
if (input == 'Y') {
/* Start the timer, allowing the user to terminate the game early with
the X key. ... | {
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"openwebmath_score": null,
"tags": "c, game, ms-dos",
"url": null
} |
ros, publisher
geometry_msgs::Twist velocity;
velocity.linear.x=1;
velocity.linear.y=0;
velocity.linear.z=0;
velocity.angular.x=0;
velocity.angular.y=0;
velocity.angular.z=0;
//std::cout<<"xPosition"<<linearposx<<std::endl;
//ros::Rate loop_rate(10);
while (ros::ok(... | {
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"id": 25100,
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"tags": "ros, publisher",
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} |
of vertices whose final shortest - path weights from the source s have already been determined. Dijkstra's Algorithm basically starts at the node that you choose (the source node) and it analyzes the graph to find the shortest path between that node and all the other nodes in the graph. View Answer, 2. Which of the fol... | {
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"lm_q1_score": 0.9669140225647108,
"lm_q1q2_score": 0.8099064842077138,
"lm_q2_score": 0.8376199592797929,
"openwebmath_perplexity": 1429.7884521328297,
"openwebmath_score": 0.37691807746887207,
"tags": nu... |
deep-learning, cnn, visualization
This suggests you might be overfitting. However, the differences between the predictions and ground truth in the images you show suggest there is a more fundamental problem. | {
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"tags": "deep-learning, cnn, visualization",
"url": null
} |
zoology
Title: How fast do hummingbirds fly? Hhhmz! A hummingbirds flew past me while I was in the garden and yet, it still managed to halt perfectly in front of a blooming flower nearest to me. Just as soon I began to wonder, how fast do hummingbirds fly and in which way do they achieve their flight in addition to th... | {
"domain": "biology.stackexchange",
"id": 9991,
"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": "zoology",
"url": null
} |
electromagnetism, lagrangian-formalism, gauge-theory, noethers-theorem, gauge-invariance
The consequence of this theorem is that if a system has a classical symmetry group, say $\mathcal{O}$, then for each $L\in\mathcal{O}$, there is a unitary (or anti-unitary) operator $\rho(L):\mathscr{H}\rightarrow\mathscr{H}$, suc... | {
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"openwebmath_score": null,
"tags": "electromagnetism, lagrangian-formalism, gauge-theory, noethers-theorem, gauge-inva... |
python, numpy, statistics
# Choose ids at random without replacement
keep = np.random.choice(zbin_ids[0], size=cn, replace=False)
# What's left is turned on in the mask for the final array
finmask[keep] = True
points = points[(finmask,)] You could use numpy.digitize to determine which bin each point belo... | {
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"tags": "python, numpy, statistics",
"url": null
} |
machine-learning, keras, tensorflow
Title: Why does accuracy remain the same I'm new to machine learning and I try to create a simple model myself. The idea is to train a model that predicts if a value is more or less than some threshold.
I generate some random values before and after threshold and create the model
i... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, keras, tensorflow",
"url": null
} |
fluid-dynamics, acoustics, everyday-life, piezoelectric
Title: Smallest droplet produced in a continuous inkjet printer I'm reading about inkjet printers, and I was wondering - how small do the droplets created get? Wikipedia's article says
A piezoelectric crystal creates an acoustic wave as it vibrates within the gu... | {
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"tags": "fluid-dynamics, acoustics, everyday-life, piezoelectric",
"url": null
} |
# Integrate $\int \frac{x+3}{\sqrt{-x^2-4x+5}} \, dx$
$$\int \frac{x+3}{\sqrt{-x^2-4x+5}} \, dx$$
first $-x^2-4x+5=-(x+2)^2+9$
$$\int \frac{x+3}{\sqrt{9-(x+2)^2}}\, dx =\frac{1}{3}\int \frac{x+3}{\sqrt{1-(\frac{x+2}{3})^2}} \, dx$$
How should I continue from here?
• There's an obvious substitution to make. – user2... | {
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"lm_q2_score": 0.8267117919359419,
"openwebmath_perplexity": 1046.064144412334,
"openwebmath_score": 0.8492646813392639,
"tag... |
python, gradient-descent, regression
Title: Stochastic gradient descent based on vector operations? let's assume that I want to train a stochastic gradient descent regression algorithm using a dataset that has N samples. Since the size of the dataset is fixed, I will reuse the data T times. At each iteration or "epoch... | {
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"tags": "python, gradient-descent, regression",
"url": null
} |
Here's an excerpt from Lecture 2 of Keith Ball's An Elementary Introduction to Modern Convex Geometry:
See the link for details, but as the image shows, the measure of a spherical cap cut off by a hyperplane which is $$\varepsilon$$ away from the origin is bounded above by the ratio between volume of a ball of radius ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773707986486797,
"lm_q1q2_score": 0.816577209914782,
"lm_q2_score": 0.8354835350552603,
"openwebmath_perplexity": 196.61635931206277,
"openwebmath_score": 0.8800475001335144,
"tag... |
k-nn
In such cases weights are not equivalent across different classes.
According to me, wights should be defined based upon the use case.
A very well explained its calculation in How does Weighted KNN works? | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "k-nn",
"url": null
} |
mass-energy
Title: Meaning of Einstein's equation $E=mc^2$? Meaning of Einstein's equation $E=mc^2$? How can a $1\,\mathrm g$ mass possess energy equal to $9\times10^{13}\,\mathrm J$? What does it actually mean? To understand the answer you should have understood well a point. Energy is conserved, mass is not. Moreove... | {
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"tags": "mass-energy",
"url": null
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fluid-dynamics, integration, dimensional-analysis
The Derivation to get to Eqn. (1):
The volumetric isothermal flow rate of nitrogen, which behaves as an ideal gas, from a storage tank at pressure $P_o$ is
$$q_o(t)=\frac{M}{\rho_o(t)}\frac{-dn}{dt} = \frac{-MV_t}{\rho_o(t)RT}\frac{dP_o}{dt} \tag{a}$$
where:
$q_o(t)=$ ... | {
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"tags": "fluid-dynamics, integration, dimensional-analysis",
"url": null
} |
c++, bash, mocks
So basically each member declaration expands to (using socket as example):
// MOCK_MEMBER(socket)
ThorsAnvil::BuildTools::Mock::MockOutFunction<decltype(::socket)> mockOutFunction_socket;
With the constructor initializing like this:
// MOCK_PARAM(socket, [](int, int, int){return 12;})
, mockOutFuncti... | {
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"tags": "c++, bash, mocks",
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} |
newtonian-mechanics, string, rigid-body-dynamics
I think that what will happen is this: When the string is cut, gravity will cause the rod to fall, such that its centre of gravity falls vertically. As the rod falls, it will rotate to become more horizontal (it must be horizontal when it lands on the ground). That wil... | {
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"tags": "newtonian-mechanics, string, rigid-body-dynamics",
"url": null
} |
human-biology, pharmacology
Myasthenia Gravis is caused by an immune response to nicotinic postsynaptic receptors on skeletal muscle. An antibody can either destroy or block the receptor site. The antibodies destroy the receptor sites more rapidly than the body can replace them. In MG, there can be as much as an 80% r... | {
"domain": "biology.stackexchange",
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"tags": "human-biology, pharmacology",
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} |
-
Fantastic answer. – Potato May 18 '12 at 9:10
Thank you, and congratulations! – MJD May 18 '12 at 11:13
Further to what Doug wrote above, I can confirm that there is no pair of orthogonal complete latin squares of order 10 or less. There are 26088 normalized complete latin squares of order 10 (the next number for ... | {
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"tag... |
quantum-field-theory, field-theory, tensor-calculus, commutator, canonical-conjugation
$$
q^a=A^\mu
$$
where $a=\mu$ is a vector index. The conjugate momentum is
$$
\frac{\partial\mathcal L}{\partial A^\mu}
$$
and, as it is an upper index in the denominator, it makes sense to write it as $\pi_\mu$. Also, you can use t... | {
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"tags": "quantum-field-theory, field-theory, tensor-calculus, commutator, canonical-conjuga... |
electromagnetism, magnetic-fields, everyday-life
Ferromagnetic materials like iron behave as if they contain many tiny bar magnets (called magnetic domains if you're interested to pursue this further), but because the magnet domains are aligned randomly the fields cancel out and there is no net magnetic field.
Howeve... | {
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ros, gazebo, simulation, ros-melodic
<node name="controller_spawner" pkg="controller_manager" type="spawner"
respawn="false" args="leo_velocity_controller leo_joint_publisher" output="screen" ns="leo"/>
</launch>
Below launch file tries to add 2rovers into the simulation using namespaces.
<launch>
<!-- No name... | {
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catkin
I've manually written package.xml but I don't understand how I am supposed to fill the build_depend and run_depend tags.
Most people (at least initially) use the catkin_create_pkg command, with appropriate arguments. If, during development, you find that you need to add more dependencies, simply edit the file ... | {
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$S( f \times g ) = S(f) \times g - S( R(S(f)) \times D(g) ) + c$ for some constant function $c$ on $\zz$.
Example indefinite sum
Using this we can easily compute things like $\sum_{k=1}^n k^3 3^k$ by applying it three times, each time reducing the degree of the polynomial part. There are other ways to achieve this us... | {
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call alone. What should you do? 2. Well, consider the following scenario. This book is based on over a dozen years teaching a Bayesian Statistics course. Nevertheless, the problem tells you that it is true. Or, more helpfully, the odds are about 1000 to 1 against the null. That’s, um, quite a bit bigger than the 5% tha... | {
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"lm_q2_score": 0.8558511469672594,
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"openwebmath_score": 0.6960655450820923,
"tags": null,
... |
python, classes, random
time.sleep(1)
if __name__ == "__main__":
main()
You should always strive to make the code the simpler possible.
About the rest of the code, minor remarks:
You should use names_with_underscores and not camelCase because of PEP8
60 is hardcoded, it would be nicer to pass in a limit parame... | {
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ros, husky, begginer-tutorials, roscpp, ros-indigo
Here is the console output:
[100%] Building CXX object drive_husky/CMakeFiles/drive_husky.dir/src/drive.cpp.o
/home/francis/husky_cws/src/drive_husky/src/drive.cpp: In function ‘int main(int, char**)’:
/home/francis/husky_cws/src/drive_husky/src/drive.cpp:28:37: error... | {
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"url": null
} |
c++, algorithm, image, opencv, openmp
// ...
if(argc != 2 || !initialImage.data)
We hit undefined behaviour if we access argv[1] before discovering that argc < 2.
Use the correct image for the y-gradient
We should be using initialImage, not finalImage to compute yValOfPixel, otherwise we'll always get zero.
Use a bi... | {
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"tags": "c++, algorithm, image, opencv, openmp",
"url": null
} |
joystick
Title: XBox Joystick - detecting signal loss
I ran into a weird behavior (i.e. crashing my robot uncontrollable into a wall) because while operating the robot, the battery shutdown. Due to the autorepeat function inside the joy_node, the last command was infinitely repeated until crash.
The question here is,... | {
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urdf, robot-state-publisher, ros-industrial, transform
Model the joint as the sum of six REVOLUTE joints
This is the approach suggested by Wim here. Then robot_state_publisher could be responsible for publishing to /tf, but it seems ugly. | {
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c#, beginner, object-oriented
public string Position { get; set; }
public int Team_Id { get; set; }
public int PlayerNumber { get; set; }
public DateTime DateOfBirth { get; set; }
public DateTime DateOfSigning { get; set; }
public string Signing { get; set; }
}
Program
sta... | {
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c++, algorithm, sorting, c++14
As mentioned in a note at the bottom of the original question, I have finally decided to give a new name to the algorithm: I named it mountain sort because it's the algorithm you would use if you needed to sort an actual range of mountain by height, where storing and comparing heights co... | {
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#### caffeinemachine
##### Well-known member
MHB Math Scholar
What's wrong with defining, say, g(x)= f(x)+ (x2, x2)?
It might so happen that $g(x_1)=f(x_1)+(x_1^2,x_1^2)=f(x_2)\neq (0,0)$.
#### Opalg
##### MHB Oldtimer
Staff member
[From my phone by Tapatalk, so this has to be short. ]
Suppose $f (t)=t^3 \sin (1/t)... | {
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"openwebmath_score": 0.9586285352706909,
... |
python, performance, console
Title: Filter column and row according to regex in header I'm writing a script that can grep the rows and columns from a text file that match a regex. I have an implementation but I'm looking to make it more elegant.
input.tsv
a b c d
a 2 9 6 ... | {
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c#, compiler, roslyn
var document = workspace.AddDocument(newProject.Id, "NewFile.cs", sourceText);
var syntaxRoot = document.GetSyntaxRootAsync().Result;
var root = (CompilationUnitSyntax)syntaxRoot;
var mainNode = root.DescendantNodes()
.OfType<Me... | {
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"tags": "c#, compiler, roslyn",
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} |
redox, titration
The fact that ascorbic acid reacts very rapidly with N-bromo-succinimide, whereas many of the interfering substances react more slowly or even do not react at all, provides a reliable titrimetric method for the determination of ascorbic acid. N-Bromosuccinimide is an oxidizing agent and thus can liber... | {
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"tags": "redox, titration",
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Hi, Sorry if this is in the wrong thread I'm new to the forums. I was recently talking my mate about how engines produce power and torque and how there's so many factors in it. I mentioned the length of conrod would be a factor but my mate disagreed that it has no effect on torque. To my...
43. How can I control two ou... | {
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"openwebmath_score": 0.7334428429603577,
... |
$$\phi(x_1,\cdots,x_n)=(e_1x_1,\cdots,e_kx_k)=(ex_1,\cdots,ex_k)$$
i.e. $\phi(x)=ex$ (or in multiplicative notation, $\phi(x)=x^{\large e}$), Q.E.D.
Note it's okay for any of $n_1,\cdots,n_k$ to be $0$, so $G$ doesn't need to be finite.
It's not true for infinite torsion abelian groups. In particular, we can get "po... | {
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"openwebmath_score": 0.8935074806213379,
"ta... |
2018 by Patrice Lee Onwuka It's Not Just Kate Spade and Anthony Bourdain, Suicide Rates Rise in Almost Every State. What's Going On? June 11 2018 by Patrice Lee Onwuka Is Anyone Buying Samantha Bee's Latest Apology for Her Vulgar Slur About Ivanka Trump? June 7 2018 by Patrice Lee Onwuka Women in Saudi Arabia are One S... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9898303416461329,
"lm_q1q2_score": 0.8226906132284809,
"lm_q2_score": 0.831143054132195,
"openwebmath_perplexity": 4883.329051840215,
"openwebmath_score": 0.2524711489677429,... |
imu, navigation, robot-localization
This is the script for the octave (some comands can change in Matlab) that I used and these are some functions needed by the script. (qGetR.m,r2rpy.m)
The script shows 2 plots:
First plot is like yours third but It doesn't show any delay. The raw velocity measurements from odometry ... | {
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Let us examine how to cast most computation for the LU factorization in terms of matrix-matrix operations. You may want to start by reviewing the discussion of how to derive the (unblocked) algorithm in Figure 12.3.2.1, in Unit 5.2.2, which we repeat below on the left. The derivation of a so-called blocked algorithm is... | {
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"openwebmath_score": 0.9991336464881897,
"tags": nu... |
fluid-mechanics, thermodynamics, heat-transfer
Question:
Suppose that a composite solid consists of alternating materials $A$ and $B$, with layer thickness $L_A$ and $L_B$, respectively. Both materials are isotropic, with thermal conductivities $k_A$ and $k_B$. It is desired to predict the average, steady-state heat f... | {
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"tags": "fluid-mechanics, thermodynamics, heat-transfer",
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programming-languages, type-theory, polymorphisms
where:
Counter = {∃X, {state:X, methods: {get:X→Nat, inc:X→X}}};
We opens it for example:
let {X,body} = c in body.methods.get(body.state);
> 5 : Nat
and compare ADTs and existential objects:
when programming with ADTs, packages are opened immediately after they ar... | {
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"tags": "programming-languages, type-theory, polymorphisms",
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python, python-3.x, programming-challenge, time-limit-exceeded, graph
# The arguments to the function above are number of nodes (n), cost of a library and road (c_lib, c_road) and cities connected by an edge (cities)
graph = {}
count = 0
cc = []
visited = set()
#Adding all edges to create... | {
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"url"... |
java, object-oriented, programming-challenge, unit-testing, roman-numerals
Title: Let's revisit Roman numbers Problem Statement:
Write a function to convert from normal numbers to Roman Numerals:
e.g.
1 => I
10 => X
7 => VII
Code:
import java.util.HashMap;
import java.util.Map;
import java.util.NavigableMap;... | {
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... |
javascript, beginner, game, dom
Edit: I've added an example at the end of the answer.
There's are a few too many hardcoded bits in the code for my liking. Several hardcoded 9s, and of course the table of neighbors. I'd extract the 9 into a "constant", just so it's not a magic number floating around. As for the neighbo... | {
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"Factoring a quartic polynomial"
### Physics Forums Values
We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weakness... | {
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"openwebmath_score": 0.7904428839683533,
"... |
everyday-life, fluid-statics, surface-tension, bubbles
For comparison, here's a photograph of the entire bowl, with the main internal bubble clusters circled. There are only a few large interior bubbles: | {
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c++, game
void Rules();//Prints All Rules
void Begin(Cards arr[]);//Draws 6 Cards For Each Player
void Orderfrom(int si, vector<int>& v);//Orders Indexes from si - l and then 0 - si and stores it in v
void getCardSize();//Asks The Users For Card Length and Cards Width
vector<string> setPlayers(int p, int b);//Creates ... | {
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"tags": "c++, game",
"url": null
} |
gazebo, groovy
Title: installing gazebo groovy on ros fuerte problem
Hi there, some weeks ago i trying to install gazebo in a workspace but everytime it fail, when i do the rosmake i obtain this error:
jose@ubuntu:~/fuerte_workspace$ rosmake simulator_gazebo
[ rosmake ] rosmake starting... ... | {
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be an example of two intersecting straight lines one to... Where the shelf represents one plane and a line that does not intersect example of two planes intersecting other, the of! ( s ) and roof only one dimension which is called example of two planes intersecting planes! The solution of two quadrics in example of two... | {
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"openwebmath_score": 0.49194785952568054,
... |
mechanical-engineering, solid-mechanics, simulation, ansys, meshing
Title: What is meant by Solid Mesh and Surface Mesh? Solid Mesh vs Surface Mesh, which method should I choose in simulation studies. What is the geometry behind these meshes. Which mesh gives accurate results? Both of them potentially give accurate re... | {
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"tags": "mechanical-engineering, solid-mechanics, simulation, ansys, meshing",
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image-processing, matlab, image-compression
Title: Lossless algorithm for hyperspectral imaging I am looking for Lossless compression algorithm for hyperspectral imaging. The only one that I found was LPVQ.
Do you know other algorithms? I am looking for pseudocode or matlab code.
Thanks I have played with SVD for 3 c... | {
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decoherence, terminology-and-notation
Their proper definitions can be given mathematically as Lindblad operators. The main equation is 8.134 in Nielsen and Chuang, with the operators (effectively) being defined in 8.96 (dephasing) and 8.108 (relaxation, also referred to as amplitude damping) | {
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java, array, unit-testing, junit, tetris
/**
* calculate all possible position of a piece
* @param passedInPiece the piece in its original position
* @return the passed in original piece, but now this piece has a variable "next",
* that is initialized and is pointing to the piece after rotation was... | {
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"tags": "java, array, unit-testing, junit, tetris",
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java, android
Title: Communicating with other fragments or to activity Android documentation says:
Often you will want one Fragment to communicate with another, for example to change the content based on a user event. All Fragment-to-Fragment communication is done through the associated Activity. Two Fragments shoul... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, android",
"url": null
} |
quantum-field-theory, operators, renormalization, feynman-diagrams
Again, the problem can be solved by demanding that the Hamiltonian is brought into normal form before we quantize it. If we work with a normal ordered Hamiltonian there are no self-loop diagrams.
This seems to suggest that if we work with normal ordere... | {
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"url": null... |
points. Step 1: Locate the y-intercept. End Behavior. So we plot a second point at (x=20 , y=20. Graph it on your calculator. Use the graph of to graph each of the following functions using transformations. Find the local maximum/minimum values, and all the x-intercepts. Then graph the circle. about$26,336. Sketch the ... | {
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"openwebmath_score": 0.6260458827018738... |
c++, tic-tac-toe, ai
{
playerTurn = true;
blockSix = 'O';
}
if(blockSeven == '7' && playerTurn == false)
{
playerTurn = true;
blockSeven = 'O';
}
if(blockEight == '8' && playerTurn == false)
... | {
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"tags": "c++, tic-tac-toe, ai",
"url": null
} |
Calculus, Biology, Chemistry, Statistics, Physics, and Computer Science. Translating Words into Algebra Lessons Math Goodies has a good lesson on writing expressions for word sentences with a quick five question online quiz at the end of the lesson. Your total pay for a week could be expressed as 6h, where h represents... | {
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"openwebmath_score": 0.4794732630252838,
"tags... |
We can choose disjoint subsets of $$M$$ by first choosing a set $$C\subseteq M$$ and then partitioning $$C$$ into two sets. There are $$\binom{n}k$$ ways to choose a $$C\subseteq M$$ of cardinality $$k$$. $$C$$ has $$2^k$$ subsets, and if $$k>0$$, these subsets come in $$2^{k-1}$$ complementary pairs. Thus, $$C$$ can b... | {
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"lm_name": "Qwen/Qwen-72B",
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"lm_q1q2_score": 0.8391749576351685,
"lm_q2_score": 0.8615382094310357,
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"openwebmath_score": 0.9166311025619507,
... |
i.e. RHS $= 10(10xy\!+\!6(x\!+\!y)\!+\!3) + 6 = 10n+6\,$ so it has units digit $= 6.\$ By induction it follows that the product of any number of naturals all ending with $6$ also ends with $6\ \$
#### @Wolfgang Kais 2019-02-13 09:51:57
@BillDubuque The other question doesn't have an "answer", it has a "question". I'd... | {
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"lm_q2_score": 0.8244619177503205,
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"openwebmath_score": 0.8901973962783813,
"tags": null,
... |
newtonian-mechanics, forces, newtonian-gravity
Depending on the level of required conceptual rigor, these formulations could be considered satisfactory or not. Probably for practical purposes both can be used, but without mixing them.
An example of the practical relevance of a keeping a clean difference between the tw... | {
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"tags": "newtonian-mechanics, forces, newtonian-gravity",
"url": null
} |
lo.logic, type-theory, dependent-type
P.P.P.S. UTT is described in Luo's PhD thesis and book here: http://www.cs.rhul.ac.uk/home/zhaohui/books.html Say that a universe $U$ is impredicative if the product $\prod_{x : A} B(x)$ is in $U$ whenever $B(x)$ is in $U$ for all $x$, and $A$ is arbitrary, i.e., not necessarily i... | {
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"tags": "lo.logic, type-theory, dependent-type",
"url": null
} |
# Triple Integral
1. May 4, 2012
### cjc0117
Hi everyone. I am trying to integrate the following:
$\int^{\frac{π}{2}}_{-\frac{π}{2}}\int^{acosθ}_{0}\int^{\sqrt{a^{2}-r^{2}}}_{-\sqrt{a^{2}-r^{2}}}rdzdrdθ$
Here's my work:
$=2\int^{\frac{π}{2}}_{-\frac{π}{2}}\int^{acosθ}_{0}r\sqrt{a^{2}-r^{2}}drdθ$
I use substituti... | {
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"openwebmath_score": 0.9025421142578125,
"tags... |
optics, astronomy
In words, one could theoretically point two cameras at the sky, and displace them so that, if viewed as components of a projected 3D image, the starfield of the night sky would have a perceivable depth. That is, Sirius or Alpha Centauri would appear closer than, say, Betelgeuse.
The idea sounds inter... | {
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"openwebmath_score": null,
"tags": "optics, astronomy",
"url": null
} |
quantum-mechanics, atomic-physics, heisenberg-uncertainty-principle, history, atoms
Title: Youtube video claims 2023 physics Nobel prize winners proved Heisenberg wrong This video claims (scroll to 11:22 frame), that inventors/improvers of a unique attosecond pulse generation which enables us to monitor atom dynamics ... | {
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"tags": "quantum-mechanics, atomic-physics, heisenberg-uncertainty-principle, history, atom... |
machine-learning, python, dataframe, smote
Upd 1/28/2020:
Tried two more options with no luck so far. Still looking for help.
A. Passing the raw outputs of train_test_split:
#oversampling minority class using smote
os = SMOTE(random_state = 0)
os_smote_X,os_smote_Y = os.fit_sample(smote_train_X,smote_train_Y) | {
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rosrun, ros-indigo
command to run
rosrun package node_name _param:=blue
rosrun package node_name _param:=green
Originally posted by kk2105 with karma: 262 on 2018-07-31
This answer was ACCEPTED on the original site
Post score: 4 | {
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"tags": "rosrun, ros-indigo",
"url": null
} |
php
//call array_values on array arguments, to ensure numeric indexes
$current = $obj;
for ($i=0, $j=0;$i<$j;++$i)
{
if (isset($current->{$properties[$i]}))//given property exists
$current = $current->{$properties[$i]};
elseif (isset($current->{$defaults[$i]}))//default exists
... | {
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"id": 8759,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php",
"url": null
} |
ros, moveit, ros-kinetic, callback, movegroup
//partLoc = "package://optimax_utils/meshes/kb04/TestOptic.STL";//ogive section!!!
partLoc = "package://optimax_utils/meshes/kb04/R200_Spinel_sphere.STL";//Spinel Sphere!!! | {
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"id": 32250,
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"openwebmath_score": null,
"tags": "ros, moveit, ros-kinetic, callback, movegroup",
"url": null
} |
# Image resizing geometry
This question landed in my inbox recently:
I have a 721x1441 matrix, T, of temperature values. The x-axis goes from 0 to 360 degrees in steps of 0.25 degrees. The y-axis goes from -90 to 90 degrees, also in steps of 0.25 degrees.
If I call imresize(T,0.25) to shrink the image by a factor of... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759610129464,
"lm_q1q2_score": 0.8317511842539541,
"lm_q2_score": 0.8479677526147223,
"openwebmath_perplexity": 1111.2354240461668,
"openwebmath_score": 0.7459090948104858,
"tags":... |
quantum-mechanics, wavefunction, hilbert-space, notation
You can not generally convert from a function to a Dirac ket with respect to energy eigenstates without knowing the Hamiltonian (which defines energy eigenstates).
Once you know the Hamiltonian and find its space of solutions, you can use an integral transforma... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, wavefunction, hilbert-space, notation",
"url": null
} |
waves, acoustics, interference, biophysics
Let's say that a green dot in the above animation reaches your ear a few hundred times per second.
Is it possible to hear this phenomenon (wave groups occurring at frequencies in the audible range) as its own tone? No, one cannot hear the actual beat frequency. For example, ... | {
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"tags": "waves, acoustics, interference, biophysics",
"url": null
} |
javascript, node.js
Title: Code that parses a file containing league played game history, outputting a json to import into a database So the code simply parses a text file that stores some game history for a gaming league. It's part of a discord.js app - for not particular reason.
The code is ugly and could definitel... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, node.js",
"url": null
} |
java, programming-challenge, computational-geometry, interval
private static int toInt(char c) {
return (c >= '0' && c <= '9') ? c - '0' : -1;
}
}
} Reading Points
you have the method and class:
private static List<Point> readPoints(String line) {
List<Point> points = new ArrayList<>();
Scanner ... | {
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"tags": "java, programming-challenge, computational-geometry, interval",
"url": null
} |
ros
Originally posted by stevemacenski with karma: 8272 on 2022-09-07
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by LiquidTurtle1 on 2022-09-14:
I was able to solve the issue by adding {'depth_module.global_time_enabled': True} to my launch file like so:
Node(
package='r... | {
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"openwebmath_score": null,
"tags": "ros",
"url": null
} |
cc.complexity-theory, randomness, randomized-algorithms, nondeterminism, barriers
Title: Consequences of $\mathsf{NP}$ containing $\mathsf{BPP}$ Many believe that $\mathsf{BPP} = \mathsf{P} \subseteq \mathsf{NP}$. However we only know that $\mathsf{BPP}$ is in the second level of polynomial hierarchy, i.e. $\mathsf{BP... | {
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"tags": "cc.complexity-theory, randomness, randomized-algorithms, nondeterminism, barriers"... |
works well because most or all bits of the key value contribute to the result. I have a pair of positive integers $(x, y)$, with $(x, y)$ being different from $(y, x)$, and I'd like to calculate an integer "key" representing them in order that for a unique $(x, y)$ there is an unique key and no other pair $(w, z)$ coul... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9626731147976794,
"lm_q1q2_score": 0.8239048929936093,
"lm_q2_score": 0.8558511506439708,
"openwebmath_perplexity": 1102.311196464562,
"openwebmath_score": 0.20374804735183716,
"... |
recursion, f#
When I run it produces the correct output:
Node value 1
Node value 2
Found a bad 9
Node value 9
Node value 4
Node value 5
Found a good 9
Node value 9
Is there a method to do this that threads the state through the recursive function calls rather than making it a mutable variable? The mutability is conf... | {
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"openwebmath_score": null,
"tags": "recursion, f#",
"url": null
} |
python-3.x, bitwise
for num in nums:
# 33 because of INT32_MIN takes 33 bits to represent.
for idx, bin_val in enumerate(f"{num:033b}"):
if bin_val != "0": # can be "1" or "-"
counts_nz[idx] += 1
vals_bit[idx] = bin_val
# make the bits binary s... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python-3.x, bitwise",
"url": null
} |
python, json, api
def get_bets(resp: Iterable[JsonDict], book_name: str) -> Iterator[Tuple[
float, # over/under
float, # spread
]]:
for game in resp:
for bookmaker in game['bookmakers']:
if bookmaker['key'] == book_name:
markets = bookmaker['markets']
y... | {
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"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, json, api",
"url": null
} |
thermodynamics, entropy, reversibility
For example the Carnot cycle, which includes two reversible isothermal processes, is the most efficient in producing work for a given heat input. But the rate of work done (power output) for the Carnot cycle approaches zero in the limit. The Carnot cycle is an ideal construct in ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, entropy, reversibility",
"url": null
} |
algorithms, arrays
If we know all intervals/weights before hand this whole task is easy without any fancy data structure, just adding the beginning of the interval with weight +value and the end with weight -value and accumulate all such values. The answer will be constant in intervals and to find the value at $x$ you... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, arrays",
"url": null
} |
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