text stringlengths 1 1.11k | source dict |
|---|---|
c#, multithreading, socket, client
internal readonly Queue<byte[]> sendMsg;
internal ManualResetEvent mreInit;
internal ManualResetEvent mreMonitorDisconnect;
internal ManualResetEvent mreIsConnected;
internal ManualResetEvent mreBeginConnect;
public delegate void ConnectedHan... | {
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with the theoretical value calculated from measurements of the ring’s mass and inside and outside radii. 3: Moment of inertia of two equal masses, of 0. In this experiment both the moment of inertia Iand the torsional constant of the Maxwell pendulum will be determined. Introduction: In this lab, you will conduct an ex... | {
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"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587257892505,
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"lm_q2_score": 0.839733963661418,
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"openwebmath_score": 0.5480412840843201,
"tag... |
java, android, recursion, exception-handling, error-handling
then remove the code duplication from the case branches.
switch (httpVerb) {
case HTTP_POST:
return executeRequest(httpPost, authHeader, header);
case HTTP_PUT:
return executeRequest(httpPut, authHeader, header);
case HTTP_GET:
... | {
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"tags": "java, android, recursion, exception-handling, error-handling",
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} |
general-relativity, differential-geometry, coordinate-systems, tensor-calculus
From the chain rule it seems like what we want is
$$X_1 = \frac{\partial f}{\partial x} = \frac{\partial f}{\partial r}\frac{\partial r}{\partial x} + \frac{\partial f}{\partial \theta}\frac{\partial \theta}{\partial x} = \frac{\partial r}{... | {
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"tags": "general-relativity, differential-geometry, coordinate-systems, tensor-calculus",
... |
c#, beginner, calculator
Error handling with user inputs
I'd probably also put a default clause, just in case your user doesn't enter one of + - * /:
switch userInput
{
...
default:
Console.WriteLine("Sorry, unknown operation.");
break;
}
I would also use a try/catch block for figuring out wha... | {
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"tags": "c#, beginner, calculator",
"url": null
} |
php, recursion, tree
Now let's have a look at your code. There are a couple of oddities which strike immediately:
Using == for comparisons
You got to be careful with with == in PHP, it's not typesafe. What this specifically means for you, in your case, it that 0 == NULL is actually true, while the typesafe === operato... | {
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"tags": "php, recursion, tree",
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c++, c++20, stl
alarm(typename clock_type::time_point tp, callback_type cb)
{
auto promise = std::promise<std::invoke_result_t<callback_type>>{};
_future = promise.get_future();
if (clock_type::now() < _time_point)
{
auto thread = std::thread{thread_func, std::move(prom... | {
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2018. Keep in mind that not all partitions are equally likely. The probability spikes also show up at the same locations when the dice are weighted and the “Payoff Table” is set for the previously mentioned “Casino Style Shut the Box” game. Our dice game allows you to see how increasing or decreasing the number of dice... | {
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"lm_q1_score": 0.9879462222582661,
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"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 423.0144392656807,
"openwebmath_score": 0.5905336737632751,
"tags... |
two items can’t be next to each other.” A question like this is easy when you are ordering items and not leaving any out, like if it was 5 items out of 5 items the answer would be \$_5P_5 … registered in England (Company No 02017289) with its registered office at 26 Red Lion Therefore the required number of ways will b... | {
"domain": "justwilliet.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9648551566309689,
"lm_q1q2_score": 0.808181946785722,
"lm_q2_score": 0.8376199694135332,
"openwebmath_perplexity": 890.4823211189182,
"openwebmath_score": 0.45561349391937256,
"tags"... |
c#, design-patterns
public GeneralParcel() {
}
}
This of course caches out the information, preventing costly recalcs. However, getting line-item charges may be dificult, and some of the Lookup rules might be interesting.
Finally, my favorite, and the most flexible;
4) Create (and implement) a series of *Price... | {
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"tags": "c#, design-patterns",
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} |
# Orbital path projections onto a 2D plane
In ProfRob's excellent answer to Is S2 still the fastest known star in the galaxy?, he posted a figure of the orbital paths of stars passing close to the supermassive black hole near the center of the galaxy, which I am re-posting here:
This figure caused some confusion in t... | {
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"lm_q1_score": 0.967899289579129,
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"lm_q2_score": 0.8267117962054049,
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"openwebmath_score": 0.6558442711830139,
"tag... |
beginner, php, ruby, ruby-on-rails
This code fails to accomplish its stated goals,
which is to securely verify client credentials in the presence of attacker clients.
I would not be willing to delegate or accept maintenance tasks
on this codebase in its current form. | {
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"tags": "beginner, php, ruby, ruby-on-rails",
"url": null
} |
homework-and-exercises, fluid-dynamics, newtonian-gravity, fluid-statics
Title: Will water kept in a beaker get compressed in a lift accelerating upwards?
I came across this question while studying fluid mechanics and the answer to the question is that P, Q and R all match to 1 i.e. range does not depend upon gravity... | {
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"tags": "homework-and-exercises, fluid-dynamics, newtonian-gravity, fluid-statics",
"url"... |
star, black-hole, gravity, neutron-star
If so, why don't we see as many of these "neutron objects" as we do non-stellar black holes? There can be no such thing as a "supermassive neutron star". The theoretical upper mass limit for a neutron star is somewhere between 2.2 and 3 solar masses. Any more massive and they in... | {
"domain": "astronomy.stackexchange",
"id": 4895,
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"tags": "star, black-hole, gravity, neutron-star",
"url": null
} |
python, neural-network, keras, rnn, pytorch
but the length of the second list is flexible, the length can be from three to inf, e.g.:
in_2 = [1,1,2,2]
or
in_2 = [1,1,1,2,2,2,3,3,3]
Also, input lists depend on each other. The first list shows the dimension of the output list. So if in_1 = [2,2], means the output must... | {
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"tags": "python, neural-network, keras, rnn, pytorch",
"url": null
} |
ros, python, publisher, rostopic, node
def callback(data):
rospy.loginfo(rospy.get_caller_id()+"I heard %s",data.data)
def ilimb_grip_pub():
# this listens to a user input for a user-defined hand configuration
rospy.init_node('ilimb_grip_pub', anonymous=True)
rospy.Subscriber("ilimb_define_pos", Stri... | {
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"tags": "ros, python, publisher, rostopic, node",
"url": null
} |
Bounds on dimension of intersection of three subspaces
Let three distinct subspaces of $\mathbb{R}^{10}$ be $W_1,W_2,W_3$ have dimensions $9$ each. Then, what are the upper and lower bounds on the dimension of $W=\displaystyle\cap_{i=1}^3W_i$? Can we say that $dim (W)=7$? I know that the standard formula for sets does... | {
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"lm_q1_score": 0.9808759666033576,
"lm_q1q2_score": 0.8152482384023884,
"lm_q2_score": 0.831143045767024,
"openwebmath_perplexity": 119.48789930379611,
"openwebmath_score": 0.9415653944015503,
"tag... |
homework-and-exercises, electrostatics, energy-conservation, potential-energy
A point mass $m_1$ with charge $q_1$ is fixed at the origin. Another point mass $m_2$ with charge $q_2$ is brought in from infinity. What is the potential energy of the system?
It may also help to remember that "$2\infty = \infty$." Moving ... | {
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"tags": "homework-and-exercises, electrostatics, energy-conservation, potential-energy",
"... |
python, python-3.x, clustering, natural-language-processing, scipy
Calling the main() program unconditionally is a bad practice. This makes the file unusable as a module in a large program. Instead, write:
if __name__ == '__main__':
main()
This will only call main() if this file is the program being executed. | {
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"tags": "python, python-3.x, clustering, natural-language-processing, scipy",
"url": n... |
organic-chemistry, safety
As a strong irritant, you should also avoid breathing any vapours or fumes, so it means handling this chemical in a suitably ventilated area.
AS with any risk assessment, it also means that before you handle the chemical you have an understanding of the response procedures in the event of thi... | {
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"tags": "organic-chemistry, safety",
"url": null
} |
c++, performance, algorithm, boost, numerical-methods
ζ(100) = 1.000000000000000000000000000000788860905221011807352053782766041368789625343145941262346579337970338
After 12 iterations
RUN SUCCESSFUL (total time: 3s)
Am I doing something inefficiently? How can I improve this code? Even though you noted that boost inc... | {
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"tags": "c++, performance, algorithm, boost, numerical-methods",
"url": null
} |
c++, design-patterns, c++20
Title: Modern chain of responsibility design pattern Based on this question, I tried to simplify the use case with simpler model,
Let me know if you have other suggests on optimizations potentially algorithmic.
#include <iostream>
#include <tuple>
#include <iostream>
class AtmHandler
{
... | {
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%cython import time from libc.stdlib cimport malloc, free head_time = time.time() cdef unsigned long p(unsigned long k, unsigned long d): cdef unsigned long power = d cdef unsigned long exp = 0 while power <= k: exp += k / power power *= d return exp cdef unsigned long * p_list(unsigned long n, unsigned long d)... | {
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"lm_q2_score": 0.8670357649558006,
"openwebmath_perplexity": 1626.5125118132278,
"openwebmath_score": 0.7797718644142151,
"tags"... |
inorganic-chemistry, transition-metals, stability, carbonyl-complexes
Platinum Metals Rev., 1972, 16, (2), 50 "The Carbonyls of the Platinum Group Metals" By C. W. Bradford, Research Laboratories, Johnson Matthey & Co Limited (link)
J. Am. Chem. Soc., 1973, 95 (22), pp 7234–7241 "Binary carbonyls of platinum, Pt(CO)n ... | {
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"tags": "inorganic-chemistry, transition-metals, stability, carbonyl-complexes",
"url":... |
ros, ros-melodic, ros-industrial, fanuc
Thanks for your time and your contribution to the community. We are looking forward to hearing your comments.
Originally posted by bbalci on ROS Answers with karma: 3 on 2020-02-18
Post score: 0
Original comments
Comment by Fetullah Atas on 2020-02-18:
I use a LRMate 200ID Fan... | {
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"tags": "ros, ros-melodic, ros-industrial, fanuc",
"url": null
} |
javascript, jquery, design-patterns
//delete
$('#btnDeletePerson').click(function () {
var personId = $('#tbDelete').val();
person.remove(personId);
});
//update
$('#btnUpdatePerson').click(function () {
var data = {
... | {
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"tags": "javascript, jquery, design-patterns",
"url": null
} |
machine-learning, deep-learning, tensorflow, convolutional-neural-network
Initalize weights from the pre-trained network until some layer
Initialize all weights from the pre-trained network beside the batch-norm
Freeze some of the layers after loading them and train only the last layers
Apply different LR to different... | {
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"tags": "machine-learning, deep-learning, tensorflow, convolutional-neural-network",
"... |
rospy
Title: How to get message type in rospy?
I want to write a library that works with multiple message types, is there a way how to get the type of the message and it's fields?
Originally posted by liborw on ROS Answers with karma: 801 on 2013-04-09
Post score: 1
There should be defines in the message for _type ... | {
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"tags": "rospy",
"url": null
} |
ros-humble, nav2, obstacle-avoidance
laser_likelihood_max_dist: 2.0
laser_max_range: 100.0
laser_min_range: -1.0
laser_model_type: "likelihood_field"
max_beams: 60
max_particles: 2000
min_particles: 500
odom_frame_id: "odom"
pf_err: 0.05
pf_z: 0.99
recovery_alpha_fast: 0.0
r... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros-humble, nav2, obstacle-avoidance",
"url": null
} |
quantum-gate, quantum-state, entanglement, superposition
The state is entangled, as the resulting outputs are either 00 or 11 with equal probability, which cannot be replicated with two unconnected qubits. (Statevector is [$ \frac{1}{\sqrt{2}}$ 0 0 $\frac{1}{\sqrt{2}}$])
However, q1 is initially not in a superposition... | {
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"tags": "quantum-gate, quantum-state, entanglement, superposition",
"url": null
} |
I want to add an answer for only two dimensions since it's much more simple:
If our vector is $$v = ai + bj$$ We can easily calculate the normal of $$v$$, because the normal of a vector is perpendicular to it. $$n = -bi + aj$$ $$n$$ is now a perpendicular vector to the vector v, it just has to be normalized, which is ... | {
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"lm_q1_score": 0.9848109538667758,
"lm_q1q2_score": 0.8141548346962671,
"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 327.30971919962604,
"openwebmath_score": 0.8307218551635742,
"ta... |
fluid-dynamics, velocity
Title: What is the definition of velocity field of a fluid if not the velocity of the molecules of that fluid? In the page 74 of Batchelor's fluid mechanics book, it is given that | {
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"tags": "fluid-dynamics, velocity",
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} |
thermodynamics, fluid-dynamics, fluid-statics
The Pipeline and vessel are made of steel, bulk modulus = $2 * 10^{11}$ Pa.
Pressure in the pipeline P1 = 2 MPa, temperature of fluid in the pipeline T1 = 286 K.
Initial pressure in the vessel P2 = -0.1 MPa, initial temperature of fluid in the vessel T2 = 280 K.
Diameter o... | {
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"tags": "thermodynamics, fluid-dynamics, fluid-statics",
"url": null
} |
# standard deviation probability | {
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"openwebmath_score": 0.8323953747749329,
"... |
architecture, history, boson-sampling
Title: Are indistinguishable bosons and fermions computationally equivalent to distinguishable qubits? From the middle-late decades of the last century, many researchers such as Bennett, Benoif, Deutsch, Feynman, Manin, Wiesner, among others, had some intuition that qubits are com... | {
"domain": "quantumcomputing.stackexchange",
"id": 4606,
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"tags": "architecture, history, boson-sampling",
"url": null
} |
game, vba, excel, tetris
Private Function getBlockRange(ByRef t As Tetromino, Target As Range) As Range
With Target.Cells(1, 1)
Set getBlockRange = Union(.Offset(getY(t.ID, t.Z, t.Y, 1), getX(t.ID, t.Z, t.X, 1)), _
.Offset(getY(t.ID, t.Z, t.Y, 2), getX(t.ID, t.Z, t.X, 2)),... | {
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"tags": "game, vba, excel, tetris",
"url": null
} |
electromagnetism, magnetic-fields, material-science
Take away, $\chi$ is the relation between $H$ and $M$, and $\mu$ is the relation between $H$ and $B$ (when everything is proportional). | {
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To cut short, I would like to know the induction proof for multiplying PNR by ten.
Doctor TWE first summarized the concept of induction:
Hi again Blake! Thanks for writing back!
In general, we use proof by induction whenever we want a proof that involves an infinite sequence or series, in this case .999...
Inductiv... | {
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"openwebmath_score": 0.7628352046012878,
"ta... |
bioinformatics, rna-sequencing
Title: Can changes of transposable elements in Drosophila be detected using RNA-Seq? Not sure if this is the right forum for such a question, but please refer me to the correct one, if possible.
Does anyone has experience in working and detecting transposable elements using High-throughp... | {
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"openwebmath_score": null,
"tags": "bioinformatics, rna-sequencing",
"url": null
} |
php, object-oriented, mvc, controller
Here we go!
Security
These two lines right here are actually quite dangerous:
$productId = $_POST['productId'];
$quantity = $_POST['quantity'];
It doesn't look like you are doing any validation/filtering/cleaning of user input. Both of these variables are copied straight out ... | {
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"tags": "php, object-oriented, mvc, controller",
"url": null
} |
### 2. Overlapping Subproblems
02 - What is DP? (Dynamic Programming for Beginners)
Sub-problems are smaller versions of the original problem. In fact, sub-problems often look like a reworded version of the original problem. If formulated correctly, sub-problems build on each other in order to obtain the solution to ... | {
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"openwebmath_score": 0.30743175745010376,
"tags"... |
hamiltonian-formalism, differential-equations
Even if you do somehow know that your equations of motion do correspond to some Hamiltonian, I do not believe that there's any known general procedure for reconstructing that Hamiltonian, unless of course your equations of motion are simple, like $\dot{q} = p / m,\ \dot{p}... | {
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(EDIT: if one looks closely, you can see how there's an induction proof concealed in this, based on 2 cases: even n, and odd n).
(EDIT #2: i have to say that MarkFL's and chisigma's proofs are very elegant. my proof is by comparison, "uglier", but has the advantage of using no other results ("elementary" proofs are of... | {
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"openwebmath_score": 0.8851572871208191,
... |
python, performance, python-3.x, file
Title: Breaking a 3GB gz file into chunks I have a 3GB gz file that I am trying to break into chunks of smaller files which are not required to be gz (I tried to make files of 10000000 lines, this is not a requirement, the chunks could be of any size), but my method is taking ages... | {
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"tags": "python, performance, python-3.x, file",
"url": null
} |
classical-mechanics, lagrangian-formalism, friction, hamiltonian-formalism, dissipation
Trick with exponential factor$^1$: Define for later convenience the function
$$ e(t)~:=~\exp(\frac{\beta t}{m}). \tag{5}$$
A possible variational formulation (4) of Lagrange equations is then given by the Lagrangian
$$\begin{align... | {
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"tags": "classical-mechanics, lagrangian-formalism, friction, hamiltonian-formalism, dissip... |
planets, earth, sun, drag, estimation
Title: How long until we fall into the Sun? As a planet moves through the solar system, a bow shock is formed as the solar wind is decelerated by the magnetic field of the planet. Presumably the creation of this shock wave would cause drag on the planet, certainly in the direction... | {
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"tags": "planets, earth, sun, drag, estimation",
"url": null
} |
that the matrices of Tin two di erent bases are similar. n) is a basis of V such that the matrix of T with respect to that basis is in Jordan form. Basis of Image of Linear Transformation? 3. T([email protected]) = ([email protected][email protected]+3x2) T is 1-1, A is the standard matrix, T is not onto, A is of size ... | {
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"id": null,
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"lm_q2_score": 0.8244619220634456,
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"openwebmath_score": 0.8836857080459595,
"tag... |
beginner, c, strings, shell, child-process
fprintf(stderr, "[EXECUTOR] Running on a child process [pid: %d]\n", getpid());
#endif
if (j == 0) {
dup2(0, STDIN_FILENO);
} else {
... | {
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"tags": "beginner, c, strings, shell, child-process",
"url": null
} |
coding-theory, error-correcting-codes
A weight $W_i$ is the number of occurrences of a combination of $i$ error bits, including bit errors perturbing the CRC value, that would be undetected by a given polynomial for a given data word length.
Also, he explains why the Hamming Weight is independent from the data as fol... | {
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"tags": "coding-theory, error-correcting-codes",
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} |
python, beginner, file, file-system
and iterate downwards:
for exponent in range (4, -1, -1):
if size > 1024 ** exponent:
unit_name = unit_names[exponent]
return str(round(size / 1024 ** exponent)) + unit_name
raise ImpossibleError
Same (almost same) applies to size_in_bytes.
... | {
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} |
python, python-3.x
def show_todos(self):
line = "-" * 100
self.get_files()
for k, v in self.todos.items():
print(f"\n{line}\n\n{k}")
for x in v:
print(f">>>{x[1]}")
self.save_csv(k, [v])
def save_csv(self, fn, todos):
import csv
... | {
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"tags": "python, python-3.x",
"url": null
} |
beginner, ruby, rock-paper-scissors
#Resulted Choices
p "Human chose: #{human}"
p "Computer chose: #{comp}"
end
#Tell who wins
p humanScore > compScore ? ("YOU WIN!") : ("COMPUTER WINS!.") Fix your formatting. While the computer doesn't care about indentation, humans do. And code is read (by humans) ma... | {
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"tags": "beginner, ruby, rock-paper-scissors",
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} |
c#, design-patterns
Unfortunately you haven't described specific use cases for your pub/sub requirement so it's hard to show this solution on specific example | {
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dft
The yellow dots are when we actually measure the signal. With 3 cycles defined (0Hz, 1Hz, 2Hz), each dot is 1/3 of the way through the signal. In this case, cycles [0 1 1] generate the time values [2 -1 -1], which starts at the max (2) and dips low (-1). | {
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differential-geometry, symmetry, conservation-laws, hamiltonian-formalism, noethers-theorem
In symplectic geometry the role of conserved charge $Q$ is replaced by so-called momentum map $\Phi: P \to \mathfrak{g}^* $ where in physical context $P$ is the phase manifold and $\mathfrak{g}^*$ the dual of the Lie algebra of... | {
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"tags": "differential-geometry, symmetry, conservation-laws, hamiltonian-formalism, noether... |
Your guess is correct: the term "zig-zag" refers to a sequence of morphisms which could go in either direction. So, a zig-zag from $$x$$ to $$y$$ is a sequence of objects $$z_0=x,z_1,z_2,\dots,z_n=y$$ together with either a morphism $$z_i\to z_{i+1}$$ or a morphism $$z_{i+1}\to z_i$$ for each $$i$$ from $$0$$ to $$n-1$... | {
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"lm_q1q2_score": 0.8057532433534064,
"lm_q2_score": 0.8333246015211008,
"openwebmath_perplexity": 81.74901736974174,
"openwebmath_score": 0.9560953974723816,
"tag... |
delphi
I end up with a RegisterConverters procedure like this for the List:
procedure TBaseList<T>.RegisterConverters(aClass:TClass; aMar:TJsonMarshal); virtual;
begin
aMar.RegisterConverter(aClass, 'fMar',
function(Data: TObject; Field: String): TObject
begin
Result := nil;
end); | {
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fluid-dynamics, acceleration, harmonic-oscillator, harmonics
Title: Fluid filled harmonic oscillator A vessel (preferably circular) filled with water is accelerating unidirectionally such that the level of water is higher on one end than the other. What I want to know is that if the vessel is immediately stopped, the ... | {
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"tags": "fluid-dynamics, acceleration, harmonic-oscillator, harmonics",
"url": null
} |
electrons, semiconductor-physics, conductors, electronic-band-theory
I find this explanation confusing. I was under the impression that "holes" are just positions that lack an electron where an electron could otherwise exist. But, in the aforementioned description, the author implies that there is a distinction betwee... | {
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"url": nu... |
six times, you should roll a six once. Probability for kids is a significant concept that requires higher level thinking skills. Let me start with a rough copy of the page that was my first backgammon lesson: To the backgammon expert, this is—well, less than trivial. 26 On average you should expect to lose 26 cents per... | {
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"tags... |
My question is this:
Is it possible to define a third operation, say $$*$$, for $$F$$ such that $$(F\setminus \{0,1\}, *)$$, is a commutative group and $$*$$ distributes over multiplication?
In other words, is it possible to have $$(F, +, \cdot, *)$$ where both $$(F,+, \cdot)$$ and $$(F\setminus \{0\},\cdot, *)$$ are... | {
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"openwebmath_score": 0.9947908520698547,
"tags... |
batch
Btw in the original code SOURCEPATHPATH looks like a typo (the ...PATHPATH at the end).
All the else blocks here look utterly pointless:
if "%SOURCEPATH%"=="" (
...
) else (
set SOURCEPATH=%SOURCEPATH%
)
if "%DESTPATH%"=="" (
...
) else (
set DESTPATH=%DESTPATH%
)
if "%folder%"=="" (
...
) e... | {
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"tags": "batch",
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} |
ros, rosbag, ros-kinetic, rqt-graph
Originally posted by rkblack on ROS Answers with karma: 1 on 2018-07-26
Post score: 0
This is entirely correct, you will not be able to see the nodes as they were during recording because the don't exist on playback.
A rosbag only records messages published on topics, not the exist... | {
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} |
qiskit, programming, quantum-state
Title: How to create states in Qiskit using complex phase angles? How do we create an arbitrary vector of the following form in Qiskit?
Say, we want to initialize a qubit with a vector,
$$
\vert \psi \rangle = \frac{1+i}{\sqrt{3}}\vert 0 \rangle - \frac{i}{\sqrt{3}}\vert 1 \rangle
$$... | {
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"tags": "qiskit, programming, quantum-state",
"url": null
} |
bioconductor, python, protein-structure, pdb
Title: I have a list of protein targets. How to get structural data (atomic coordinate) from PDB? I have a list of around 500 protein targets (human). I only have their protein symbols. As an example:
EGFR
AR
FOXA1
CXCR3
...
I want to get structural data (atomic coordinate)... | {
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programming, qiskit
If anyone knows how I can just reset the circuit and keep the qubits to 4 through the simulations, I'd appreciate it.
Edit:
attempt at clarifying slow down. Some efforts to try and solve the issue as well as the error taking ~10 hrs to manifest makes finding the error difficult, but the rate of ite... | {
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"tags": "programming, qiskit",
"url": null
} |
motor, design, torque, brushless-motor, gearing
Title: How to design a representative drive cycle based on speed, acceleration, and torque requirements? I recently came across the topic of "drive cycle design". I would like to learn more about this as I delve into motor and RC vehicle design.
Given: the RC vehicle m... | {
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ros2
The contributing guide here should be exhaustive and up-to-date:
https://index.ros.org/doc/ros2/Contributing/#contributing-code
There is no need to be copying code between various places in your filesystem every change; you can set up your workspace to have your own forks in it. Then you can just edit-in-place an... | {
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} |
javascript, php, ajax
header("Last-Modified: ".gmdate("D, d M Y H:i:s", $lastModified)." GMT");
header("Etag: $etagFile");
header('Cache-Control: public');
if (strtotime($ifModifiedSince)==$lastModified || $etagHeader == $etagFile){
header("HTTP/1.1 304 Not Modified");
exit;
}
else{
?>
<!DOCTYPE html>
<html>
<... | {
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"tags": "javascript, php, ajax",
"url": null
} |
game, css, html5, angular.js, twitter-bootstrap
You should not use IDs for style hooks. I personally avoid using them entirely, unless I want to use same-page anchors - I prefer to use classes prefixed with js-* or, when I have access to Angular (like you do), I prefer to use directives, when I want JavaScript interac... | {
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"tags": "game, css, html5, angular.js, twitter-bootstrap",
"url": null
} |
acid-base, ph, titration
The chemical reactions
The chemical equation (1) in the question is incorrect and missing something. It should reflect that in aqueous solution, hydrochloric acid is completely dissociated (strong acid), and ammonia is partially dissociated (weak base). One way of writing this is:
$$\ce{HCl(aq... | {
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java, performance, android
Currently I am using this method below to display Actions to player and I'm calling it on the start of each turn to refresh the whole layout and display Actions that are available to player (based on his Resources and his Achievements so far).
The code is much longer but it is pretty similar... | {
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"tags": "java, performance, android",
"url": null
} |
ds.algorithms, graph-algorithms, directed-acyclic-graph
You can then plug in a "test" method if you just want the acyclic ones :
sage: len(list(digraphs(4, property = lambda g:g.is_directed_acyclic())))
31
It returns 302 digraphs on 5 vertices, and 5984 on 6 vertices. But I am a bit scared to try larger values :-)
By... | {
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"openwebmath_score": null,
"tags": "ds.algorithms, graph-algorithms, directed-acyclic-graph",
"url": null
} |
watch. If a given optimization problem can be transformed to a convex equivalent, then this interpretive benefit is acquired. find the feasible region, which is formed by the intersection of all the constraints. Examples. •How do we encode this as an optimization … Convex optimization studies the problem of minimizing ... | {
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"lm_q2_score": 0.8539127473751341,
"openwebmath_perplexity": 1216.9361770754356,
"openwebmath_score": 0.663661003112793,... |
python, python-3.x
Title: Outstanding password keeper w/ password generator After almost completely redoing the first version I think I finally have it. I still have a few things to add/change, but I think it's pretty good and safe. I've improved security features as well as overall functionality.
I haven't run this p... | {
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electromagnetism, magnetic-fields, potential
which means you can just proceed with typical arguments based on Ampère's Law.
Also, it is worth pointing out that the solutions to Maxwell's equations will also not be unique, but in the static cases we can often get a unique solution by demanding the fields to vanish at i... | {
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"url": null
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navigation, mapping, gmapping
http://wiki.ros.org/openni_camera
http://wiki.ros.org/openni_launch
The second link has some tutorials listed which should help get you started on understanding the interaction between ROS and the Kinect. What you're talking about is a little advanced, so work on learning how to launch t... | {
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A somewhat different way is as follows.
s = DSolve[{op[r][op[r][f[r]]] == 0, f[b] == 0, f'[b] == 0}, f, r]
{{f -> Function[{r}, (1/( 4 b^2))(-b^4 C[1] + 2 b^2 r^2 C[1] - r^4 C[1] + b^4 C[2] - b^2 r^2 C[2] - b^4 C[2] Log[b] - r^4 C[2] Log[b] + 2 b^2 r^2 C[2] Log[r])]}}
Resolve[Exists[{C[1], C[2]},Simplify[f'[1 + b]/... | {
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"lm_q2_score": 0.8774767970940974,
"openwebmath_perplexity": 1936.2690507564175,
"openwebmath_score": 0.4675614535808563,
"ta... |
.net, combinatorics, vb.net
Private ReadOnly choose, total As Integer, repetition As Boolean
''' <summary>Create a new Combinations object</summary>
''' <param name="pick">Number of items to be picked</param>
''' <param name="pickfrom">Number of items to pick from</param>
''' <param name="allowRepetit... | {
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"tags": ".net, combinatorics, vb.net",
"url": null
} |
photons, experimental-physics, quantum-optics, cavity-qed
Title: How to produce and detect Fock or photon number states? I would like to build, if possible, an intuition of the physical methods on how photon number states $|n\rangle$ are experimentally produced and how are measured. We can focus on single mode.
It wou... | {
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"tags": "photons, experimental-physics, quantum-optics, cavity-qed",
"url": null
} |
here, but this is easily extensible to N variables. asked by Anonymous on December 16, 2018; probability. Since the times between event occurrences in the underlying binomial process are independent geometric random variables, the sequence of interevent times in a Poisson process is composed of independent random varia... | {
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"lm_q1q2_score": 0.8151368109280316,
"lm_q2_score": 0.8221891261650247,
"openwebmath_perplexity": 324.79155855465274,
"openwebmath_score": 0.798759937286377,... |
homework-and-exercises, electrostatics, electric-fields, charge, potential
Title: Question on finding the electric field?
Find the electric field strength vector at the centre of a ball of radius $R$ with volume charge density $p=\vec{a}\cdot \vec{r}$, where $a$ is a constant vector, and $r$ is a radius vector drawn ... | {
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"ur... |
c#, console
if (cleanData == "upvote")
{
newPost.Upvote();
}
else if (cleanData == "downvote")
{
newPost.DownVote();
}
else
{
val = false;
... | {
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"tags": "c#, console",
"url": null
} |
catkin-make, rosrun
Originally posted by gvdhoorn with karma: 86574 on 2015-06-18
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Cesare on 2015-06-18:
Thank you for all the help, i found my way out :) actually i don't think i need install() :)
Comment by gvdhoorn on 2015-06-1... | {
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automata, finite-automata, nondeterminism
It has 3 states, q1 - q2 - q3 and can make transition from q1 to q2 on 0 or epsilon and from q2 to q3 on 1 or epsilon
My question is do we take epsilon transition before reading input or after reading input and after reading the input, if we reach a state where we have epsilon... | {
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"tags": "automata, finite-automata, nondeterminism",
"url": null
} |
linux, configuration, nginx
# notes {
# 443 ssl http2;
# [::]:443 ssl http2;
# }
}
server {
listen 80;
listen [::]:80;
server_name contfix.co.il www.contfix.co.il;
ssl_certificate /etc/nginx/conf.d/ssl/contfix.co.il.crt;
ssl_certificate_key /etc/nginx/conf.d/ssl/contfix.co.il.... | {
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"tags": "linux, configuration, nginx",
"url": null
} |
java, game, swing, number-guessing-game
// Main method
public static void main(String args[]) {
// instantiate GuessGame object
GuessGame app = new GuessGame();
}// End main method
}// End main class Problems I see:
comment and comment2 are initialised twice, once in the class definition and again in the con... | {
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"tags": "java, game, swing, number-guessing-game",
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blast, sequence-alignment, filtering
-max_target_seqs =1> Maximum number of aligned sequences to keep Not applicable for outfmt <= 4 Default = `500' *
Incompatible with: num_descriptions, num_alignments
From the section names, it seems like only the latter option (-max_target_seqs) would have any effect o... | {
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"tags": "blast, sequence-alignment, filtering",
"url": null
} |
c++, collections, c++14, variant-type
Tag dispatching: to construct a TypeEraser, I'm passing an unused pointer to its constructor so it can deduce its type.
Type erasure: TypeEraser stores the object in a properly (see 3.) sized and aligned memory segment. It also stores pointers to functions needed to delete the con... | {
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c, unix, to-do-list, topological-sorting
SEE ALSO
calendar(1), schedule(1)
TODO(1)
Here's the code:
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#in... | {
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"tags": "c, unix, to-do-list, topological-sorting",
"url": null
} |
quantum-mechanics, quantum-entanglement, superposition
Title: Question on the logic behind quantum computing According to Wikipedia,
"Quantum computing studies theoretical computation systems (quantum computers) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform op... | {
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"tags": "quantum-mechanics, quantum-entanglement, superposition",
"url": null
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outline = Binarize[WatershedComponents[Blur[img, 10]] // Colorize, 0.1]
Superimposing this over the original image shows how the segmentation works:
ImageMultiply[img, outline]
Advantages of this kind of method are that it is quick, generalizes nicely, and is flexible. Disadvantages are that it is not really doing... | {
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"lm_q2_score": 0.824461932846258,
"openwebmath_perplexity": 3306.0204840269985,
"openwebmath_score": 0.2803191840648651,
"tag... |
nlp, scikit-learn, word-embeddings, text, gensim
Title: Text segmentation problem I am new to ML and trying to solve problem of text segmentation.
I have a transcript of news show and I want to split this transcript into parts by topic. I tried to google and asked chatgpt and found a lot of info, but I don't understan... | {
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pcl, osx
Originally posted by Ivano with karma: 36 on 2013-10-26
This answer was ACCEPTED on the original site
Post score: 2 | {
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"tags": "pcl, osx",
"url": null
} |
python
def __stats_pick_off(self):
'''Pitcher picks off a baserunner.'''
self.current_pitcher.pick_off()
self.pitch_team_stats.pick_off()
def __stats_walk(self):
'''Walk.'''
self.bat_team_stats.walk()
self.current_batter.walk()
self.__stats_plate_app()
... | {
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"tags": "python",
"url": null
} |
classical-mechanics, energy, heat, friction
Title: Where does the lost energy go in a rubber band powering a rotating shaft? Okay, I'm no physics whiz, and this has me stumped. You know those toy airplanes you can get with the rubber-band driven propellers? You twist the propeller a bunch of times, and this stores p... | {
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Theorem $\$ For natural numbers $\rm\:a,e,n\:$ with $\rm\:e,n>1$
$\qquad\rm n\:|\:a^e-a\:$ for all $\rm\:a\:\iff n\:$ is squarefree, and prime $\rm\:p\:|\:n\:\Rightarrow\: p\!-\!1\:|\:e\!-\!1$
Proof $\ (\Leftarrow)\ \$ Since a squarefree natural divides another iff all its prime factors do, we need only show $\rm\:p\... | {
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"openwebmath_perplexity": 293.02639238887406,
"openwebmath_score": 0.8927630186080933,
"tag... |
classical-mechanics, kinematics, acceleration
Title: Determining the trajectory of a particle given the tangential and normal accelerations Consider a particle with tangential and normal accelerations $\vec{a_T}(t)$ and $\vec{a_N}(t)$ respectively ($t$ is time). If the initial velocity and position vectors are both $\... | {
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"tags": "classical-mechanics, kinematics, acceleration",
"url": null
} |
organic-chemistry, computational-chemistry, stereochemistry, theoretical-chemistry, conformers
Your example with cyclohexane is actually a clear-cut case, since you really need to break bonds to switch from cis to trans. I visualized all possible chair conformations and the partitioning into configurational subspaces.... | {
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"tags": "organic-chemistry, computational-chemistry, stereochemistry, theoretical-chemist... |
c#, strings, iterator
and another one for enumerating chars or only a particular range:
internal class CharEnumerator
{
private const int IndexOutOfRange = -1;
public CharEnumerator(string line) : this(line, 0, line.Length) { }
public CharEnumerator(string line, int index0, int length)
{
Line... | {
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"url": null
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