text stringlengths 1 1.11k | source dict |
|---|---|
compute the slope of the tangent line to a polar curve at a given point. Polar Curves Plotter: 10. The equation from the reference is: #Area = int_alpha^beta 1/2r^2 d theta# We know #r(theta)# but we need to find the value of #alpha and beta# The sample problem tells us that the loop starts at: #theta = (2pi)/3# and it... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513905984457,
"lm_q1q2_score": 0.8130442815718196,
"lm_q2_score": 0.8244619328462579,
"openwebmath_perplexity": 490.98177478940477,
"openwebmath_score": 0.8563680648803711,
"tag... |
python, performance, formatting
Excellent, a teaching moment!
Cool, we get to learn about Exceptions today.
They're not scary "crash and burn!" things.
They're actually your friend.
Used wisely, they can make your code more robust, not less.
Let's look at the call site, to see how this is being used.
def can_connect( ... | {
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c#, beginner, tic-tac-toe, winforms, gui
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Location = new System.Drawing.Point(216, 12);
this.button3.Nam... | {
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"url": null
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The commonality among the approaches was their recognition that 3 non-collinear points uniquely define a vertical parabola, so they didn’t need to worry about polynomials of degree 0 or 1. (They haven’t yet heard about rotated curves that led to my earlier post on rotated quadratics.)
Solution 1–Regression: Because ... | {
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"tags": n... |
c++, algorithm, search, random, simulation
You can address those on your own, but I'll cover the pragma philosophy. Firstly: I never indent preprocessor directives--it calls them out more clearly. But even better: don't use 'em, especially not for a fluffy IDE feature (why doesn't it use a certain comment to cue tha... | {
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Define $$\phi(G)=\min\{|S|\; |\; S\subseteq G, \; S^2=G\}$$ The first observation is quite obvious
If $$G_1\cong G_2$$, then $$\phi(G_1)=\phi(G_2)$$.
So as noted by the comments since $$(\mathbb{Z}/p\mathbb{Z})^{\times}\cong Z_{p-1}$$ (where $$Z_n$$ is the cyclic group of order $$n$$), we can consider this problem in... | {
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"tags... |
c, security, linux, wrapper, child-process
Now I run this PHP script owned by www-data (via browser / local apache web server):
<?php
echo exec('/some/path/run-as /some/path/script.sh');
?>
I expect the script to output 'root' when ran. This is an ambitious thing to try, with many pitfalls - especially for enviro... | {
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game, sql, sql-server, community-challenge
now at the end of the PROC we have a table of all the Randomized Cells should we want to query that information.
I left the Text description of the cells in the queries so that it was easier to see what was happening there when the table was queried.
The big thing is that we... | {
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"tags": "game, sql, sql-server, community-challenge",
"url": null
} |
optics, electromagnetic-radiation
If creating your "two" point sources that way is acceptable in your scenario, then varying the phase of one or both sources is usually easily accomplished. For example, you can use moving mirrors to physically vary the length of the path from your beam splitter to one of the source lo... | {
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"tags": "optics, electromagnetic-radiation",
"url": null
} |
experimental-chemistry, analytical-chemistry
You are doing emission spectroscopy (AES= atomic emission spectroscopy) not atomic absorbance. Most well prepared calibration curves, or and carefully prepared standards have a very small intercept.
What was the composition of the blank?
My question is what exactly does it... | {
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quantum-mechanics, condensed-matter, bose-einstein-condensate, applied-physics, big-list
The primary application of atomic BEC systems is in basic research areas at the moment, and will probably remain so for the foreseeable future. You sometimes hear people talk about BEC as a tool for lithography, or things like tha... | {
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"tags": "quantum-mechanics, condensed-matter, bose-einstein-condensate, applied-physics, big... |
thermodynamics, statistical-mechanics, phase-transition, ising-model, non-equilibrium
If you do this, what will happen is quite simple. Each of the two regions will behave like an Ising model at its own temperature, and unless one of them is at the critical temperature there will not be any long-range interaction betw... | {
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"tags": "thermodynamics, statistical-mechanics, phase-transition, ising-model, non-equilibr... |
ros, ros-comm, rostest, ros-master-uri, ros-indigo
Title: Port to connect to rostest rosmaster after Indigo
Connecting to rosmater with specific port number used to be possible. I see this pull request against Indigo that randomizes the rosmaster port for rostest.
Does this mean that there is now no way to connect to... | {
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} |
newtonian-mechanics, classical-mechanics, orbital-motion, potential-energy
Title: Kinetic Energy in central force motion My question is how can I get to know the velocity of a particle in a elliptical trajectory if a particle is affected by a potential
\begin{equation}
U(r) = -\frac{k}{r}
\end{equation}
I have a par... | {
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"ur... |
quantum-mechanics, operators, harmonic-oscillator, quantum-optics, coherent-states
the displacement operator's matrix elements with respect to the number-basis read:
$$
⟨m|D(\alpha)|n⟩=\sqrt{\frac{n!}{m!}}\cdot\alpha^{m-n}\cdot e^{-|\alpha|^2/2}\cdot L_n^{(m-n)}\left(|\alpha|^2\right)\quad\text{when }m\geq n,
$$
where... | {
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bond, periodic-trends, molecular-structure, vsepr-theory
\ce{BiH3}&90.5^\circ \\ \end{array}$$
Notice that there is a large decrease from $\ce{NH3}$ to $\ce{PH3}$ and then very small changes for $\ce{AsH3}$, $\ce{SbH3}$, and $\ce{BiH3}$.
You could make the argument that the larger orbitals of the heavier elements will... | {
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is symmetric R is irreflexive if no element of R. that is, if every of. If means the same thing as will talk about a Certain type of relation called an antisymmetric ''... Many number of examples and antisymmetric acyclic relation is irre & pm ;,., so in order to be asymmetric… asymmetric v. symmetric public relations ... | {
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... |
Differentiation : (1) Take natural logarithm on both sides of an equation y = f(x) and use the law of logarithms to simplify. There are, however, functions for which logarithmic differentiation is the only method we can use. For differentiating certain functions, logarithmic differentiation is a great shortcut. With lo... | {
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"lm_q1_score": 0.9632305370909698,
"lm_q1q2_score": 0.8468210054249908,
"lm_q2_score": 0.8791467595934565,
"openwebmath_perplexity": 706.2411146557117,
"openwebmath_score": 0.9268009662628174,
"tags":... |
machine-learning, math, decision-trees
The best splits for the root are Gene-B < 5.5 and Gene-C < 456. These both reduce the entropy by about $0.42$, which is a substantial improvement.
When you choose a split, you introduce a leaf for the possible outcomes of the test. Here it's just 2 leaves: "yes, the value is smal... | {
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I was able to without effort come up with RebaseIsException to pass the test that wants you to throw new ArgumentException. Few other test where passed using RebaseIsDigitsEmptyOrZero. I had to borrow from a few sites to come up with what you see in RebaseSolution. In particular the foreach loop and the do/while loop t... | {
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"lm_q1_score": 0.9559813551535005,
"lm_q1q2_score": 0.8087051920305691,
"lm_q2_score": 0.8459424314825853,
"openwebmath_perplexity": 6922.432688067834,
"openwebmath_score": 0.1763838529586792,
"tag... |
general-relativity, forces, gravity, black-holes, binary-stars
The question is not about dynamics, nor about the calculation of orbits. The question is only about the value of the force of attraction between black holes, e.g., while kept fixed. That way, no dynamics is involved. (If it helps to simplify the question, ... | {
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ruby
should just be
books = Book.new
Vertical whitespace
There should be a blank line after every "logical" break. In particular, there should be a blank line after the attr_accessor:
attr_reader :book_name, :author_name, :page_count, :more, :book_array
def initialize
Also, 3 blank lines after the class body are a ... | {
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ros, opencv, ros-kinetic, tracking, libopencv
Comment by VAVROS on 2017-11-14:
Oh ok, i didn't know that. How can i check if im'm compiling against the right OpenCV Version?
Comment by gvdhoorn on 2017-11-14:
If you're using the CMake snippet as shown on wiki/vision_opencv, then you're most likely using the version sh... | {
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### joshmccraney
Yes! This is exactly what I was doing. But what is there theory behind minimizing $\int (\phi''-f)^2 \, dx$? Am I missing something?
4. Apr 4, 2015
5. Apr 5, 2015
### pasmith
It is possible to define a norm on a suitable space of real-valued functions on $[0,1]$ whereby $$\|g\| = \left(\int_0^1 g(... | {
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"openwebmath_score": 0.8644064664840698,
"tag... |
soft-question
Title: Download only physics and maths wikipedia pages for offline use There are tools for downloading the entire wikipedia database (above 8 Gb without pictures), but I would like to download only physics and maths pages, to view them offline. Wikipedia pages have a tree structure in categories, so it s... | {
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quantum-mechanics, homework-and-exercises, energy, potential, schroedinger-equation
$$
where $\Psi(r,\theta,\varphi)=R(r)Y(\theta,\varphi)$. Assuming $E-V_o>0$, one can show (after some tricksy manipulations) that, for fixed angular momentum $\ell$,
$$
R_\ell(\rho)=\rho^\ell\,\xi_\ell(\rho)
$$
where $\rho=kr$ and $\x... | {
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"tags": "quantum-mechanics, homework-and-exercises, energy, potential, schroedinger-equatio... |
reproduction, endocrinology, pregnancy, ovulation
In theory, yes, of course there would be a lower chance of initiating a viable pregnancy (implantation rather than conception is the most obvious problem) were the endometrial lining to be unstable at the time of ovulation. The problem of luteal phase deficiency is alo... | {
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"tags": "reproduction, endocrinology, pregnancy, ovulation",
"url": null
} |
field-theory, renormalization, information
The Hamiltonian of such a chain is:
$$
\mathcal{H} = \frac{1}{2} k \sum_{i=1} ^N (\mathbf{r}_{i+1} - \mathbf{r}_{i})^2 + \frac{1}{2} m\mathbf{\dot{r}}_{i}
$$
where $k$ is the spring constant, $m$ is the mass, $\mathbf{r}_{i} $ is the displacement, and $\mathbf{\dot{r}}_{i}$ ... | {
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"tags": "field-theory, renormalization, information",
"url": null
} |
c#, beginner, number-guessing-game
validResponse = true;
if (response == 1)
{
keepPlaying = true;
}
else if (response ==2)
{
keepPlaying = false;
... | {
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ros, bumblebee2
Originally posted by Miquel Massot with karma: 1471 on 2014-11-24
This answer was ACCEPTED on the original site
Post score: 1 | {
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(1218k) Scalar and Vector Product Intro KEY0001. This fits perfectly upon quantities that are measured using math and physics. 2. When we calculate the scalar product of two vectors the result, as the name suggests is a scalar, rather than a vector. In pure mathematics, a vector is any element of a vector space over so... | {
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"lm_q2_score": 0.8128673223709251,
"openwebmath_perplexity": 542.805935340855,
"openwebmath_score": 0.7808359265327454,... |
newtonian-mechanics, rotational-dynamics, everyday-life
However, if you are a daily commuter, and your tires are not subject to massive frictional forces, it would be better if you counter-lean during turns because that would increase your range of vision. Life-saving swerves on the road are also quicker when you coun... | {
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} |
c++, tree, template
return false;
}
// Determines if the given node exists in the tree
template<typename T>
bool BinarySearchTree<T>::find_node(Node<T>* node) {
if (!root || !node) {
return false;
}
Node<T>* walker = root;
while (walker) {
if (node->get_value() > walker->get_value())... | {
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} |
ros, rviz, jetson
Original comments
Comment by Sally on 2016-08-29:
Hi, have you solved this problem? Could you teach me? I meet the same problem!
Comment by Winston on 2016-10-16:
Hi, have you solved this problem? Could you teach me? I meet the same problem!
You need to run:
unset GTK_IM_MODULE
From the ROS Arm ins... | {
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electromagnetism, magnetic-fields
Then I went on reading and realized that the situation might be more complicated than I originally believed: I started wondering what is actually $\mathbf{f}_{mag}$?
Let's for example consider problem $7.7$ (pag.311, I'll add a picture for calrity). The free charges in the metal bar e... | {
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of a Riemann sum. 1 Riemann Sums and Area 3 2. Riemann Sums Name:_____ Date:_____ A Riemann sum Sn for the function is defined to be Sn = n k fck x 1 (). 318: 49-56 2. If the sym- bol oo appears above the E, it indicates that the terms go on indefinitely. The application is intended to demonstrate the use of Maple to s... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9932024694556524,
"lm_q1q2_score": 0.857522686115624,
"lm_q2_score": 0.863391617003942,
"openwebmath_perplexity": 685.8367052427091,
"openwebmath_score": 0.9426590204238892,
"t... |
digital-communications, software-defined-radio, polar
To conclude, note that not only it is indeed possible to transmit/receive AM with an SDR; you can actually transmit/receive two AM signals on the same bandwidth!
$$s_{\text{QAM}}(t) = (A_{m1} + m_1(t))\cos(2\pi f_c t) + (A_{m2} + m_2(t))\sin(2\pi f_c t)$$
You selec... | {
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"openwebmath_score": null,
"tags": "digital-communications, software-defined-radio, polar",
"url": null
} |
quantum-field-theory, lagrangian-formalism, topological-field-theory, chern-simons-theory, wilson-loop
We'll do canonical quantization following Witten. The phase space of Chern-Simons on $T^2 \times \mathbb{R}$ consists of (conjugacy classes of) homeomorphisms from $\pi_1(T^2)$ to $G$ (where $G$ is the gauge group of... | {
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"openwebmath_score": null,
"tags": "quantum-field-theory, lagrangian-formalism, topological-field-theory, chern-simons... |
values, unless the value $\lfloor \sqrt{n}\rfloor$ appears in both sets - when $\bigl\lfloor \frac{n}{\lfloor \sqrt{n}\rfloor}\bigr\rfloor = \lfloor \sqrt{n}\rfloor$, or equivalently $n < \lfloor \sqrt{n}\rfloor\cdot (\lfloor \sqrt{n}\rfloor + 1)$ - in which case there are exactly $2\lfloor \sqrt{n}\rfloor - 1$ distinc... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
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"lm_q1q2_score": 0.8334652903510111,
"lm_q2_score": 0.8499711775577736,
"openwebmath_perplexity": 84.77723650589019,
"openwebmath_score": 0.9522563219070435,
"tag... |
pressure
I have two pistons, with D2 being double D1
I assume you mean the areas of the pistons, so lets say that the area of the left piston is $A_1$ and the area of the right piston is $A_2 = 2A_1$. The pressure acting on them I will call $P_1$ and $P_2$ respectively, and the resulting forces: $F_1$ and $F_2$.
Cons... | {
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"id": 48266,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "pressure",
"url": null
} |
python, optimization, algorithm, primes
i = sundaram3(10**6)[-1]
print "Input: largest prime less than 10^6, No. of runs: 25000"
print "new slowest:", timeit.timeit('is_prime_new_slowest(i)', setup="from __main__ import is_prime_new_slowest, i; import math", number=25000)
print "new slow:", timeit.timeit('is_prime_ne... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, optimization, algorithm, primes",
"url": null
} |
ros
Title: Where should I start for image processing?
I am new In ROS. I am working on a quadrotor, And I want to start image processing by ROS, in order to mapping,detecting faces, detecting objects and letters. I am looking for some tips and instruction to start it as a beginner.
Originally posted by ghazaleh on R... | {
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"id": 16766,
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"tags": "ros",
"url": null
} |
object-oriented, vba, excel, interface, polymorphism
Public Property Let Action(ByVal value As String)
this.Action = value
End Property
Public Property Get Action() As String
Action = this.Action
End Property
Public Property Let Target(ByVal value As String)
this.Target = value
End Property
Public Prope... | {
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"tags": "object-oriented, vba, excel, interface, polymorphism",
"url": null
} |
cat("The upper triangular matrix is: \n")
## The upper triangular matrix is:
B$U ## [,1] [,2] [,3] ## [1,] 1 0 5.00000 ## [2,] 0 3 -19.00000 ## [3,] 0 0 10.66667 cat("The lower triangular matrix is: \n") ## The lower triangular matrix is: B$L
## [,1] [,2] [,3]
## [1,] 1 0.0000000 0
## [2,] 4 1.000000... | {
"domain": "amazonaws.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808724687407,
"lm_q1q2_score": 0.8014526186526483,
"lm_q2_score": 0.8175744739711883,
"openwebmath_perplexity": 877.3651646877197,
"openwebmath_score": 0.6075227856636047,
"tags": ... |
java, algorithm, programming-challenge, time-limit-exceeded, combinatorics
System.out.println("After second for loop:" + System.currentTimeMillis());
int c = n;
int nextPoint;
while (!unused.isEmpty()) {
c--;
nextPoint = data.get(unused.poll() - 1);
freq.put(nextPoint, ... | {
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"id": 30903,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, algorithm, programming-challenge, time-limit-exceeded, combinatorics",
... |
first prime number and... Way of dividing the number under the radical symbol on one side of equation. Of a product \over 2 } the fraction by the conjugate is easily found by reversing the sign the!: Step 1 conjugate is easily found by reversing the sign in the of. By reversing the sign in the middle of the equation ea... | {
"domain": "com.ec",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9805806546550656,
"lm_q1q2_score": 0.8373303299532093,
"lm_q2_score": 0.8539127566694177,
"openwebmath_perplexity": 695.313528980847,
"openwebmath_score": 0.941363513469696,
"tags": null,... |
c++, c++11, linked-list, memory-management
When you're dealing with memory details, you must be very conscious of exceptions.
In particular, if your new statements throw exceptions after your length++ statements, the length is then incorrect. Luckily the solution is simple: just allocate the memory before incrementing... | {
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"id": 9652,
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"tags": "c++, c++11, linked-list, memory-management",
"url": null
} |
to complete the project outside of class using your own computer or a university facility. Give a formula of the general term and explicitly write out the rst 4 terms. Free Taylor/Maclaurin Series calculator - Find the Taylor/Maclaurin series representation of functions step-by-step. Determine the Taylor series for the... | {
"domain": "tunup.fr",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9911526436103748,
"lm_q1q2_score": 0.8193975780811791,
"lm_q2_score": 0.826711791935942,
"openwebmath_perplexity": 259.4769035586787,
"openwebmath_score": 0.9378222823143005,
"tags": null,
... |
python, raspberry-pi
if __name__ == '__main__':
GPIO.setwarnings(False)
GPIO.cleanup()
commands = {
"f": "forward",
"b": "backward",
"s": "stop"
}
try:
car = Car()
while True:
command = raw_input()
getattr(car, commands[command])()
... | {
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"openwebmath_score": null,
"tags": "python, raspberry-pi",
"url": null
} |
particle-physics, higgs, large-hadron-collider, experimental-technique, experimental-technology
If we're looking at the invariant mass distribution of a particular final state, the signal will often be a peak-like shape. Combinatorial backgrounds tend to follow smooth broad shapes (like exponential or simple polynomia... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics, higgs, large-hadron-collider, experimental-technique, experiment... |
c#, .net, tree, .net-core
(prevNode, currentNode) = (currentNode, currentNode.Left);
}
}
}
private void SkipNode(Node prevNode, Node nodeToSkip)
{
var countOfFurtherNodes = 0;
if (nodeToSkip.Right != null) countOfFurtherNodes++; | {
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"openwebmath_score": null,
"tags": "c#, .net, tree, .net-core",
"url": null
} |
electromagnetism, differential-geometry, dimensional-analysis
Title: Dimensions of EM potential/field tensor components in curvilinear coordinates According to this resource on Maxwell theory in curved spacetime, the form of the field strength tensor is independent of the choice of coordinates:
$$F_{\mu \nu} = \partia... | {
"domain": "physics.stackexchange",
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"tags": "electromagnetism, differential-geometry, dimensional-analysis",
"url": null
} |
navigation, ros-hydro, costmap, costmap-2d, costmap-2d-ros
To my understanding, the ObstacleLayer::updateBounds function in the mentioned plugin handles the area to be updated. This area is designed to be rectangular. In my case the laser scan reaches a bit behind the robot but far from an all around view (screen shot... | {
"domain": "robotics.stackexchange",
"id": 17975,
"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": "navigation, ros-hydro, costmap, costmap-2d, costmap-2d-ros",
"url": null
} |
thermodynamics, thermal-radiation, physical-chemistry, combustion
The flames that you see would usually be "optically thin" - that is they are transparent to their own and other radiation. In such circumstances, the flames emit light that usually correspond to discrete transitions at particular wavelengths - about as ... | {
"domain": "physics.stackexchange",
"id": 80279,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, thermal-radiation, physical-chemistry, combustion",
"url": null
... |
cc.complexity-theory, np-hardness
Title: NP-complete variants of NPI problems Motivated by these posts, An NP-complete variant of factoring and Relationship between symmetry and computational intractability, It seems to be worthwhile to investigate the different factors that increase the hardness of problems in $NPI$ ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "cc.complexity-theory, np-hardness",
"url": null
} |
formal-languages, formal-grammars, parsers, left-recursion
So, it becomes (after removal of direct left recursions):
$$A → bA'$$
$$A' → afdaA'| eps$$
$$B → Cd | e$$
$$C → gC'$$
$$C' → gfC' | eps$$
$$D → baD' | gg D'$$
$$D'→ fD' | fgD' | fdaaD' | eps$$
My specific Question is: Do I have to follow this way (convert all ... | {
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"tags": "formal-languages, formal-grammars, parsers, left-recursion",
"url": null
} |
string-theory, mathematical-physics, supersymmetry
Title: Semi-infinite forms? I am reading Vafa's paper 'Topological Mirros and Quantum Strings'. In this paper, the author says the Hilbert Space of a fermionic string theory corresponds to the space of semi-infinite forms on the loop space.
I only know differential f... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "string-theory, mathematical-physics, supersymmetry",
"url": null
} |
moon, earth, relative-motion
It's simply the winding s-shaped route your train took, heading generally east but never exactly, that caused these oscillations. | {
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"tags": "moon, earth, relative-motion",
"url": null
} |
everyday-chemistry
Assuming that the industrial strength cleaning vinegar's acidity is also 5%, then why can't it be consumed?
Why must raw vinegar be refined or purified for human consumption?
Is Beverly Leestma correct in her wariness beneath?
Part of me thinks Heinz is just looking to get in on the popularity of ... | {
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"id": 10983,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "everyday-chemistry",
"url": null
} |
turing-machines, transition-systems
Title: How does a Turing machine read a transition table as a function? I am learning about Turing machines. I understand the alphabet set of symbols and the states a machine can be in. However, I do not understand how the transition function works.
I come from a maths background an... | {
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"tags": "turing-machines, transition-systems",
"url": null
} |
python, python-2.x
A better way to pad strings is to use string.rjust. An even better way is to use the Format Specification Mini-Language.
Then we can put it all together.
if __name__ == '__main__':
column_width = 25
table = list(itertools.product([False, True], repeat=2))
for op in ops:
print(op)... | {
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"id": 20811,
"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": "python, python-2.x",
"url": null
} |
python, errors, roslaunch
Title: SetuptoolsDeprecationWarning in ros2 Humble I was trying to follow this tutorial in the official documentation of ros2 Humble for Integrating launch files into ROS 2 packages and ran in to the below given error after doing trying to perform a build on the package using
colcon build --p... | {
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"tags": "python, errors, roslaunch",
"url": null
} |
vba, excel
Next, you may want to consider setting this as the default member of your class since it is the one you use the most. Chip Pearson offers a tutorial: http://www.cpearson.com/excel/DefaultMember.aspx .
Next, extract this:
If dictCorrectionOptions("Claim Removal - Have Wanted Claims").strOnOffSwitch = "On" Th... | {
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"tags": "vba, excel",
"url": null
} |
cc.complexity-theory, ds.algorithms, sorting
A possible $\mathrm{lg}(n!)+O(n^{0.5-ε})$ combination: If the distribution shaping works well enough and we make the batch size equal $|S|+n^{0.5+ε}$ and selectively reject $≈n^{0.5+ε}$ elements in (*) (above), we can insert all but these $≈n^{0.5+ε}$ elements with entropy... | {
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"tags": "cc.complexity-theory, ds.algorithms, sorting",
"url": null
} |
cmake
Title: Add MySQL to a ROS project?
Hello,
How would I add MySQL functionality to a ROS project? I am running Ubuntu 11.04, I have MySQL installed, the .h is located at /usr/include/mysql/mysql.h.
Is there a way to include MySQL in the CMakeLists.txt file? Ideally, I would like to be able to do something like: #... | {
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"tags": "cmake",
"url": null
} |
java, android
NotificationCompat.Builder builder = new NotificationCompat.Builder(
parent);
builder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager = (NotificationManager) parent
.getSystemService(Context.NOTIFICATION_SERVICE);
mNo... | {
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"id": 15875,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, android",
"url": null
} |
for the knapsack problem. So that is what we call a greedy algorithm. Greedy algorithm gives optimal solution for this problem. Assignment status: Already Solved By Our Experts (USA, AUS, UK & CA Ph. The problem is to select items to maximize their total value without exceeding a limitation on total resource. If the ta... | {
"domain": "orsicycling.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9835969689263265,
"lm_q1q2_score": 0.8087027323801034,
"lm_q2_score": 0.8221891261650247,
"openwebmath_perplexity": 607.8602767137431,
"openwebmath_score": 0.5280691385269165,
"ta... |
javascript, unit-testing, regex, roman-numerals
{'input': 4, 'expected': 'IV'},
{'input': 5, 'expected': 'V'},
{'input': 9, 'expected': 'IX'},
{'input': 12, 'expected': 'XII'},
{'input': 16, 'expected': 'XVI'},
{'input': 29, 'expected': 'XXIX'},
{'input': 44, 'expected': 'XLIV'},
{'input': ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, unit-testing, regex, roman-numerals",
"url": null
} |
beginner, performance, image, vba, excel
Title: Finding and pasting images into a specific cell The below macro finds and pastes images into column A. While the macro works, it starts to slow down when running 500+ images. I am not too familiar with the VBA language, does anyone have any suggestions to make this code ... | {
"domain": "codereview.stackexchange",
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"tags": "beginner, performance, image, vba, excel",
"url": null
} |
It has grown so far that if you search our library’s catalog for the keyword \Fourier" you will nd 618 entries as of this date. Fourier series: Solved problems °c pHabala 2012 Alternative: It is possible not to memorize the special formula for sine/cosine Fourier, but apply the usual Fourier series to that extended bas... | {
"domain": "cenews24.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587218253717,
"lm_q1q2_score": 0.8165917829206087,
"lm_q2_score": 0.826711791935942,
"openwebmath_perplexity": 740.4227252301312,
"openwebmath_score": 0.8933987021446228,
"tags": nul... |
cc.complexity-theory, randomness, derandomization, expanders
There exist some method, such that a good algorithm does have an affect on it (uses say $n^d+O(n/\log n)$ random bits)? There exist some barrier for achieving such a result?
*The question refers to the randomized algorithm in a black-box manner. You can't e... | {
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} |
calculator, cobol
DATA DIVISION.
WORKING-STORAGE SECTION.
01 INP PIC A(14).
01 NUM1 PIC 9(7).
01 NUM2 PIC A(2).
88 PLU VALUE "+".
88 AIDS VALUE "-".
88 MULT VALUE "*".
01 NUM3 PIC 9(15).
01 ANS PIC 9(8).
PROCEDURE DIVISION.
DI... | {
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"id": 40374,
"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": "calculator, cobol",
"url": null
} |
php
Watch out for nested for loops. Pretend they're screaming at you to find a better algorithm.
Don't call functions in the argument of a for loop unless you need to get a value that might change during the loop. | {
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"tags": "php",
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} |
special-relativity
Since he sees his own clock tick at a normal speed (as long as he does not compare it), is that time freeze sudden? At a certain point? According to SR he having rest mass cannot reach the speed $c$. So he must stop accelerating before that. Then the light will catch up to him? The exercise to make ... | {
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"tags": "special-relativity",
"url": null
} |
radio-astronomy
Side note: if we instead projected an image into space, in order to acceptably resolve the image a receiver would need to have an angular resolution equal to, or greater than, than the projection. This includes a spatial resolution criterion in addition to the signal-to-noise performance discussed belo... | {
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"tags": "radio-astronomy",
"url": null
} |
TrussSolver2. Determine these from the Select a part and press "Delete" to delete it. The theoretical basis of the method of joints for truss analysis has already been discussed in this article '3 methods for truss analysis'. " It is usually useful to label the members and the joints in your truss in the beginning and ... | {
"domain": "sys-builder.com",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9637799399736476,
"lm_q1q2_score": 0.8440659389270501,
"lm_q2_score": 0.8757869965109765,
"openwebmath_perplexity": 1352.5012064232913,
"openwebmath_score": 0.3305284380912781,
"tags... |
javascript, ecmascript-6, promise, google-maps, data-visualization
path.setMap(snappedMap);
}
}).catch(function(error){
console.log(error);
});
});
Divide processing in simple functions, then chain them in linear fashion.
Use literal .property or ['property'] consistently, don't mix them as i... | {
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"tags": "javascript, ecmascript-6, promise, google-maps, data-visualization",
"url": n... |
# Finite Extensions and Bases
The question reads: Find a basis of $\mathbb{Q}(\sqrt{2}+\sqrt[3]{4})$ over $\mathbb{Q}$. Describe the elements of $\mathbb{Q}(\sqrt{2}+\sqrt[3]{4})$.
My original thought on the approach was to find the minimum polynomial (which would have degree 6), and then just take create a basis whe... | {
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"lm_q1q2_score": 0.8115607447686002,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 145.8034770659341,
"openwebmath_score": 0.9276941418647766,
"tag... |
c#, linq, csv, xml
foreach (var result in xDocument.Descendants("Item").Select(x => new {
title = (string)x.Element("Name"),
amount = (string)x.Element("Count"),
price = (string)x.Element("Price"),
year = (string)x.Element("Year"),
productID = (string)x.Eleme... | {
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"id": 25064,
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"openwebmath_score": null,
"tags": "c#, linq, csv, xml",
"url": null
} |
quantum-mechanics, hilbert-space, operators, wavefunction, notation
Certainly, different functions $\psi,\psi'$ cannot generate the same ket this way, since for $\psi \neq \psi'$, we must have $\psi(x_0) \neq \psi'(x_0)$ at some $x_0 \in \mathbb{R}$, so the generated kets will differ, since the coefficient of at least... | {
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"tags": "quantum-mechanics, hilbert-space, operators, wavefunction, notation",
"url": nul... |
python, beginner
def intro(generators):
print("Welcome to our madlib generator!")
print("We'll ask you for a serious of words, you'll give us the words, and "
"we'll make a dope ass story out of it!")
print("Let's get some info from you first.")
print("Select the type of madlib you want. ")
... | {
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"url": null
} |
java, programming-challenge
"73167176531330624919225119674426574742355349194934969835203127745063262395783180169848018694788518438586156078911294949545950173795833195285320880551112540698747158523863050715693290963295227443043557668966489504452445231617318564030987111217223831136222989342338030813533627661428280644448... | {
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"id": 15302,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, programming-challenge",
"url": null
} |
matlab, wave, periodic
Title: How to Extract a Period of a Periodic Pulsed Signal? I rercorded a sequence of zeros and ones which is repeated many times. However, the first and the last repetitions may not be complete because I have to start recording at a random time, so the sequence can be started when I hit record ... | {
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"id": 8211,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "matlab, wave, periodic",
"url": null
} |
linear-programming, integer-programming
Title: When LP solution is ILP solution? For many discrete problems, it's natural to consider their continuous relaxations. A common case is when instead of $x_i \in \{0, 1\}$ we allow $x_i \in [0, 1]$. In certain cases, the original problem is an integer linear programming (ILP... | {
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"id": 17815,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "linear-programming, integer-programming",
"url": null
} |
newtonian-mechanics, gravity, orbital-motion, centripetal-force, escape-velocity
If you are on the pole at a distance $r$ from the centre of the Earth (NB from the centre of the Earth not from the Earth's surface) then your tangential velocity is:
$$ v = r\omega \tag{1} $$
where $\omega$ is the angular velocity of the... | {
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"id": 17901,
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"tags": "newtonian-mechanics, gravity, orbital-motion, centripetal-force, escape-velocity",... |
electromagnetism, classical-mechanics, lagrangian-formalism, potential-energy, classical-electrodynamics
Title: Velocity-dependent potentials and the dissipation function From this previous question Charge, velocity-dependent potentials and Lagrangian where the citation is shown at the page 22, §1.5 of the book Classi... | {
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"id": 66092,
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"openwebmath_score": null,
"tags": "electromagnetism, classical-mechanics, lagrangian-formalism, potential-energy, cla... |
star, distances, history
https://en.wikipedia.org/wiki/Stellar_classification#Yerkes_spectral_classification[1]
The heliocentric theory, that the Earth revolves around the Sun, was first suggested in classical Greece. Aristotle (384-322 BC) rejected that theory, because of the lack of detectable stellar parallax caus... | {
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"id": 5921,
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"openwebmath_score": null,
"tags": "star, distances, history",
"url": null
} |
ros
while processing /opt/ros/groovy/stacks/turtlebot/turtlebot_bringup/launch/includes/_robot.launch:
Invalid tag: Cannot load command parameter [robot_description]: command [/opt/ros/groovy/stacks/xacro/xacro.py '/opt/ros/groovy/stacks/turtlebot/turtlebot_description/robots/kobuki_hexagons_kinect.urdf.xacro'] retur... | {
"domain": "robotics.stackexchange",
"id": 13616,
"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": "ros",
"url": null
} |
c++, computational-geometry
m_pnts[0] = points[num_pnts-1];
for (size_t i = 0; i < num_pnts; ++i)
{
m_pnts[i+1] = points[i];
}
m_pnts[num_pnts+1] = points[0];
m_pnts[num_pnts+2] = points[1];
m_s[0] = -detail::alpha_distance<Real, Point, dimension>(m_pnts[0], m_pnts[1], alpha);
if (a... | {
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"tags": "c++, computational-geometry",
"url": null
} |
Therefore, the total area A under the curve between x = a and x = b is the summation of areas of infinite rectangles between the same interval. Choose from 40 different sets of term:auc = area under the curve flashcards on Quizlet. The sides of your triangle do not adhere to the triangle inequality theorem. AUC is the ... | {
"domain": "laquintacolonna.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9865717468373085,
"lm_q1q2_score": 0.8898094567022089,
"lm_q2_score": 0.9019206758704633,
"openwebmath_perplexity": 351.8731791619468,
"openwebmath_score": 0.8136438727378845,
"ta... |
quantum-mechanics, measurements, quantum-interpretations, measurement-problem
Title: A non-metaphysical interpretation of measurement in quantum mechanics In quantum mechanics, measurement plays a fundamental role and to me, its role is usually described in a rather odd way. The Copenhagen interpretation states thus
... | {
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"tags": "quantum-mechanics, measurements, quantum-interpretations, measurement-problem",
... |
algorithm, c, reinventing-the-wheel, image, numerical-methods
All suggestions are welcome.
The summary information:
Which question it is a follow-up to?
Two dimensional bicubic interpolation implementation in Matlab and
Two dimensional gaussian image generator in C.
What changes has been made in the code since last ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithm, c, reinventing-the-wheel, image, numerical-methods",
"url": null
} |
human-eye, central-nervous-system
Outside of this, a huge amount of our brain is devoted to visual perception. There are some really strange quirks about our eyes; most popular is the existence of the blind spot. Additionally, our 90 million rods are squeezed more into peripheral vision, leading to fuzzier imaging i... | {
"domain": "biology.stackexchange",
"id": 8062,
"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": "human-eye, central-nervous-system",
"url": null
} |
power-spectral-density, correlation
What does this $K_F$ mean physically?
EDIT:
One such reference:
Bayesian nonparametric spectral estimation. See this related question which details further an intuition for covariance. From that we see that covariance is a correlation indicating a linear similarity between two funct... | {
"domain": "dsp.stackexchange",
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"tags": "power-spectral-density, correlation",
"url": null
} |
performance, csv, r
"force" 0.02 0.00 0.02 0.00
"getOption" 0.02 0.00 0.02 0.00
"is.data.frame" 0.02 0.00 0.02 0.00
"is.na" 0.02 0.00 0.02 0.00
"list" 0.02... | {
"domain": "codereview.stackexchange",
"id": 15432,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, csv, r",
"url": null
} |
electrostatics, method-of-images
Since the charge is above the plane, there is a component of force that is parallel to the plane. This attracts electrons. The perpendicular component does not. Also the distance to the charge is larger than the distance from an electron to nearby electrons. Both of these keep the dens... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "electrostatics, method-of-images",
"url": null
} |
turtlebot, ros-groovy
and
roslaunch turtlebot_follower follower.launch
As in Tutorial, I opened an ssh from my PC and run the launch files.
For "roslaunch turtlebot_teleop keyboard_teleop.launch" I get the following error:
IOError: Errno 13 Permission denied: '/home/turtlebot/.ros/rosdep/sources.cache/index'
[turtlebo... | {
"domain": "robotics.stackexchange",
"id": 12883,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "turtlebot, ros-groovy",
"url": null
} |
newtonian-mechanics, classical-mechanics, forces, friction
Also, how would one refer to this downwards force? I feel like it's not weight, but it is acting in the same direction. Great question. I'm surprised that upon searching, I haven't come across a train-push vs pull question in Physics SE. I'll try to give a det... | {
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"tags": "newtonian-mechanics, classical-mechanics, forces, friction",
"url": null
} |
matrix should be equal to the number of columns of the second matrix. Multiplication is multiplication. Join Curt Frye for an in-depth discussion in this video, Perform matrix multiplication, part of MATLAB 2018 Essential Training. ones operation and we’re assigning it to the Python variable tf_int_ones. Multiplying No... | {
"domain": "innoqua-handwerk.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.982287697148445,
"lm_q1q2_score": 0.8248603413823101,
"lm_q2_score": 0.8397339636614178,
"openwebmath_perplexity": 384.6809315355939,
"openwebmath_score": 0.7845232486724854,
"ta... |
ros, build-from-source, catkin.workspace
Originally posted by elpidiovaldez on ROS Answers with karma: 142 on 2021-04-12
Post score: 0
Can you delete workspace after building/INSTALLING from source ?
the short answer would be: yes, you can delete the bootstrap workspace after you've ran catkin_make_isolated --insta... | {
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"tags": "ros, build-from-source, catkin.workspace",
"url": null
} |
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