text stringlengths 1 1.11k | source dict |
|---|---|
ros, ros-control, ros-kinetic, gazebo-ros
Comment by gvdhoorn on 2018-03-02:
I would say Dave Coleman's ros_control boilerplate is quite ok. Perhaps you can compare with that.
I must say that a simple hw iface implementation should work fine with a simple AsyncSpinner(0) or AsyncSpinner(2). Are you doing anything spec... | {
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"url": null
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php, security, email
Title: Safety of contact form I have made slight edits to a simple PHP contact form that I have found online. Can you see anything else that I could do to ensure that I am protected from email injections and spam? I have used trim, stripslashes and htmlspecialchars and made a simple question to ac... | {
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"tags": "php, security, email",
"url": null
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c#, beginner, object-oriented, game
Here we're removing all the dead rovers from the list. There's a method RemoveAll that can do this for us.
public void DestroyRovers()
{
this.rovers.RemoveAll(rover => rover.RoverDead());
}
rover.RoverDead() looks strange to me; I think IsDead would be a better name. IsDead is ... | {
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"url": null
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c++
Title: Call of Duty World at War Speed Hack This is a simple speed hack I created for Call of Duty World at War. It uses a pointer, SPEED_ADDRESS with an offset, SPEED_OFFSET1 to find the address I intend to write to. I'm not very well versed in using offsets. The code I provided does work, but I feel there's prob... | {
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"tags": "c++",
"url": null
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javascript, css, dynamic-loading
ScriptLoader.createStyles= function(options){
// We return a promise, a listenable object
return new Promise(function(resolve, reject){
// create link, attach options, attach handlers, additional logic
link.onload = resolve;
link.onerror = reject;
});
}
// Creating a... | {
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"tags": "javascript, css, dynamic-loading",
"url": null
} |
python, python-3.x, file
if user_input == 1:
#View a file
if check_path(path):
open_file(path)
else:
continue
elif user_input == 2:
#append to a file
if check_path(path):
append_file(path)
el... | {
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"tags": "python, python-3.x, file",
"url": null
} |
c++, recursion, reinventing-the-wheel, template, c++20
Simplify variadic templates
You have two versions of pixelwiseOperation(), one which takes exactly 3 arguments, and one which takes 3 + a variable number of arguments. However, note that parameter packs are allowed to be empty, so you don't need the version which ... | {
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"tags": "c++, recursion, reinventing-the-wheel, template, c++20",
"url": null
} |
ros, tcpros, topic, subscribe, publish
Originally posted by stevemacenski with karma: 8272 on 2019-10-11
This answer was ACCEPTED on the original site
Post score: 2
Original comments
Comment by CodeFinder on 2019-10-15:
Thanks for clarifying! Unfortunately, I need a single topic in my case and in fact, there are many... | {
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"tags": "ros, tcpros, topic, subscribe, publish",
"url": null
} |
javascript, jquery, twitter-bootstrap
UPDATE
To answer your question about how to get rid of your anti-pattern around id properties. Consider an <li> element that looks like this:
<li class="list-group-item justify-content-between" data-option-value="0">
Here you set a data-property to link this li back to the optio... | {
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ros-kinetic
sorry for formation of code. first time to try use it.
Originally posted by voyt on ROS Answers with karma: 3 on 2018-05-31
Post score: 0
Original comments
Comment by simbha on 2018-05-31:
why you need this? if you already have the data you can do the operation there only.
Yes, this is possible.
Usefuln... | {
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reference-request, quantum-computing
How can I design quantum circuit for f?
e.g.
x f(x)
0 0 0 0
0 0 1 0
0 1 0 1
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 0
1 1 1 1
What is quantum analog of multiplexers?
What does the matrix of f-CNOT gate look like?
How can I design quantum circuit for... | {
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deep-learning, classification, keras, weighted-data
Thirdly and lastly add it to the model fitting
model.fit(X_train, y_train, class_weight=class_weights)
Attention: I edited this post and changed the variable name from class_weight to class_weights in order to not to overwrite the imported module. Adjust accordingly... | {
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"tags": "deep-learning, classification, keras, weighted-data",
"url": null
} |
classical-mechanics, determinism
I think that the reason he chose to focus on a situation where we let a system evolve for a long time and then apply the reverse law for that length of time, is that in reality the state of a system becomes more and more complex and "drifts" apart farther from its initial state, which ... | {
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"tags": "classical-mechanics, determinism",
"url": null
} |
python, beginner, game, functional-programming, adventure-game
election = '\n' + '''25 October 2029. For the rest of the summer and the early autumn, you bounced back and for once resources are not a priority if you have made it this far.
But, the problems never stop. A new polotician named Mr. Powell looks to takeove... | {
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... |
c, strings
return memcpy(insertion_point, c_string, length);
} The code is generally nice, so my comments are really just picking up crumbs.
I'm not comfortable with your use of asserts to catch errors that could
legitimately occur at runtime. I consider asserts to be for asserting logical
impossibilities, not for... | {
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points in the graph, find shortest.... Of a quiz and worksheet, you are reviewing the use of ’. ] ) sert à résoudre le problème du plus court chemin for academic competitive. So that interviewers will ask you many questions related to the left of the edge [ ]... From source vertex ‘ d ’ for remaining vertices is set to... | {
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"tags": nu... |
ros, ros2, rclpy
Title: How to create Streaming Qos Profile for publisher in Python ROS2
Hi,
I am trying to create a QoS profile for the publisher, but couldn't find any examples for it. Can anyone please guide me on how I can create one. I am using Foxy for ROS2 and python as the language.
Originally posted by Flas... | {
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"tags": "ros, ros2, rclpy",
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} |
atomic-physics, atomic-clocks
Title: Why H/Cs/I atomic clocks are more complicated than Rb? It is known that low-cost commercial Rb atomic clocks are fairly simple in construction: gas cell is probed by a light source and excited by RF around 6.8Ghz. When frequency is right - we see decrease of the photodiode signal.
... | {
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"tags": "atomic-physics, atomic-clocks",
"url": null
} |
python, python-3.x, assembly
Title: Assembler for Brookshear Machine As a small exercise in Python, I created an Assembler for the rather simple Brookshear Machine (see f.e. Brookshear Machine, please note, however, that the instruction set differs from mine).
The instruction set used by this implementation is based o... | {
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"tags": "python, python-3.x, assembly",
"url": null
} |
visible-light, vision
My question is why the light source is perceived as several discrete sources instead of a light gradient? The reason is that LED lights typically pulse rather than give continuos light. This can be because of flickering due to converting AC power into DC, but also dimmer or driver circuits regula... | {
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"tags": "visible-light, vision",
"url": null
} |
qiskit, oracles
Title: Implementing a multioutput quantum oracle on Qiskit A quantum boolean oracle is an operator that should work as follows:
$ \sum_x U_f |x, 0> = \sum_x |x, f(x)>$.
Now, suppose that I have two input qubits and two output qubits and I want to implement the following $f(x)$:
f(00) = 00
f(01) = 10
f... | {
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"tags": "qiskit, oracles",
"url": null
} |
data-structures, trees
Closure property of affine transformations
If $T$ is a a rotation around some point in space, note that it can be represented as an affine transformation. Also, the set $\mathcal{T}$ of affine transformations is closed under composition. In particular, if $T_1,T_2$ are two affine transformatio... | {
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Rather than focusing on only the red dots, it's interesting to focus on the white solid lines as well. Primes occur at the intersection of solid lines (no divisors of lesser value other than 1). So assigning a color to those lines can be of interest, as can be focusing on the patterns inside those squares, and the on-o... | {
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"lm_q2_score": 0.8558511524823263,
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"openwebmath_score": 0.5994757413864136,
"... |
c++, c++11, thread-safety, collections, lock-free
//lock free
template< class InputIt >
iterator insert_after(const_iterator pos, InputIt first, InputIt last, std::memory_order loadOrder = std::memory_order_seq_cst, std::memory_order storeOrder = std::memory_order_seq_cst) {
if (first == last) return i... | {
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of Portfolio Return: Two Risky Assets A. T = the required rate of return. 24, Year 3 = -2. This translates to (9. If you want to find the "Sample" standard deviation, you'll instead type in =STDEV. Hi guys, I need to calculate standard deviation for a portfolio with 31 stock. To calculate the standard deviation of a da... | {
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"lm_q2_score": 0.822189121808099,
"openwebmath_perplexity": 882.7628329495639,
"openwebmath_score": 0.7142139673233032,
"tags": null,... |
rust
Title: List parsing for 'cut' I'm new to Rust and am learning by implementing my own version of cut. This is a snippet that parses the <list> of ranges required for the -f, -b, or -c options. The relevant section of the spec states: | {
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quantum-chemistry, theoretical-chemistry
https://aip.scitation.org/doi/pdf/10.1063/5.0023185
Notably, NWChem uses the second quantization approach and is described in this open resource paper: https://arxiv.org/pdf/1904.01131.pdf
Finding algorithms to rapidly create valid CI expansions was a big research area in the ... | {
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"tags": "quantum-chemistry, theoretical-chemistry",
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temperature, measurements
I don't see how is it possible that these scientists manage to measure two billion Kelvin. Are there such measuring instruments that can measure extremely hot stuff without melting and still get a proper reading, or is it a theoretical deduction? Fusion is plasma physics, and in plasma physic... | {
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"tags": "temperature, measurements",
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waves, acoustics
You can't exactly choose the velocity of your sound wave with the equipment that produces it, but you can pick the frequency. The dispersion relation of the material will then determine the phase and group velocities of the wave that propagates through it at that frequency.
For example, the dispersion... | {
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# Right Coset by Identity
## Theorem
Let $G$ be a group whose identity is $e$.
Let $H$ be a subgroup of $G$.
Then:
$H = H e$
where $H e$ is the right coset of $H$ by $e$.
## Proof
We have:
$\displaystyle H e$ $=$ $\displaystyle \set {x \in G: \exists h \in H: x = h e}$ Definition of Right Coset of $H$ by $e$ ... | {
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Problem. Let $R$ be an infinite ring with 1 and let $U(R)$ be the set of units of $R.$ Prove that if $R \setminus U(R)$ is finite, then $R$ is a division ring.
Solution. Suppose, to the contrary, that there exists some $0 \neq x \in R \setminus U(R).$ First note that if $I \neq R$ is a left or right ideal of $R,$ then... | {
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"openwebmath_score": 0.9459206461906433,
"tags": ... |
the angles of each two forces. The area of a parallelogram is also equal to the magnitude of the vector cross product of two adjacent sides. Area of parallelogram formed by vectors, Online calculator. However, I keep getting the wrong answer. solution Up: Area of a parallelogram Previous: Area of a parallelogram Exampl... | {
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"openwebmath_score": 0.7887305021286011,
"... |
roscore
a node initializes
a service call is issued
Also, monitoring scripts, like rxgraph, will do much more frequent queries as they do not maintain persistent connections to the nodes they are monitoring.
Originally posted by kwc with karma: 12244 on 2011-04-19
This answer was ACCEPTED on the original site
Post s... | {
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python, javascript, beginner, algorithm, strings
Javascript uses camelCase by convention not snake_case
Undeclared variables are placed in global scope or throw a parsing error in strict mode. The further a variable's scope is from the current scope the longer it takes to get the reference and thus the slower the code... | {
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biochemistry, proteins
So through endocytosis or phagocytosis, vesicles full of extracellular proteins are uptaken and may fuse with a lysosome. The hydrolases thus digest whatever they can. In a cell stress response cells may also digest their own contents with the aid of lysosomes in a process called autophagy. We c... | {
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machine-learning, visualization, categorical-data, linear-regression
> library(reshape)
> subset(melt(my.df, id="Price", variable = "District"),value == 1)[,c(1,2)]
Price District
1 10000 DistrictA
7 20000 DistrictB
13 30000 DistrictC
19 40000 DistrictD
25 50000 DistrictE
After that you plot the Price dependent... | {
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classification
Title: Binary softmax decision boundary In this paper, in figure 4:
the decision boundaries are shown for different $W1$ and $W2$s. If the softmax classification forces either $W_1.x > W_2.x$ or $W_1.x < W_2.x$ for class 1 and class 2 respectively, then the decision boundary is $(W1-W2).x = 0$ which me... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "classification",
"url": null
} |
to be super careful about asymptotic notation) is to de ne O(g(n)) as a set of functions:. Big Oh (O): If we write f(n) = O(g(n)), then there exists a function f(n) such that ∀ n ≥ n 0 , f(n) ≤ cg (n) with any constant c and a positive integer n 0. Ω Notation< can be useful when we have lower bound on time complexity o... | {
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"tags":... |
But $$x_j$$ are "components" (unknown variables), thus in this second example, the desired output should contain all possible sortings and conditions under which they are valid. That is, more precisely, in this example, the desired output is:
$$\{ \{\{x^{(2)},x^{(1)},x^{(3)}\},\{x_2\ge x_3\}\},\{\{x^{(1)},x^{(2)},x^{(... | {
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"lm_q2_score": 0.8596637559030338,
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"openwebmath_score": 0.22209760546684265,
"ta... |
electromagnetism, lagrangian-formalism, quantum-electrodynamics, hamiltonian-formalism, variational-principle
Title: Can QED be formulated in terms of independent vector potential and bivector fields? We can obtain the classical equations of motion for electromagnetism by considering the vector potential $A^\mu$ and t... | {
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"tags": "electromagnetism, lagrangian-formalism, quantum-electrodynamics, hamiltonian-forma... |
vba, excel, winapi
I know you probably just copy-pasted from vb forums so moving on...
Function ProcIDFromHWnd(ByVal hwnd As Variant) As Variant
Dim idProc As Variant
GetWindowThreadProcessId hwnd, idProc
ProcIDFromHWnd = idProc
End Function
Instead, how about without variant:
Private Function ProcIDFrom... | {
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ros, navigation, baseglobalplanner, base-local-planner
Originally posted by Sidd on ROS Answers with karma: 155 on 2015-08-12
Post score: 4
Original comments
Comment by DanThe on 2016-03-17:
Does anyone have a suggestion about this please? It would be really helpful.
Comment by ahendrix on 2016-03-17:
If you have a c... | {
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"tags": "ros, navigation, baseglobalplanner, base-local-planner",
"url": null
} |
T51 Use the result of Exercise B.T50 to build a very concise proof of Theorem CNMB. (Hint: make a judicious choice for the basis B.)
Contributed by Robert Beezer Solution [1045]
#### Subsection SOL: Solutions
C10 Contributed by Chris Black Statement [1028]
Theorem BS says that if we take these 5 vectors, put them int... | {
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"tags": nu... |
One is atomic time that is governed by the period taken for an electron to move around once in its orbit. Vysvětlete mi někdo prosím pánové polopatě funkci time shiftu u přijímačů s HDD. The conic is a parabola if and only if B 2 = 4AC, in which case we can define constants a,c such that A = a 2 and C = c 2 and write t... | {
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"openwebmath_score": 0.4225013554096222,
"... |
Last edited: Jun 5, 2016
14. Jun 6, 2016
### awholenumber
ProfuselyQuarky ,
i am really trying to see a bigger picture of trigonometry ... i had a very hard time trying to understand it from the basics , to seeing a few advanced trigonometric functions ...
which is why i keep putting pictures like these ... so that... | {
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"openwebmath_score": 0.7587529420852661,
"tags... |
$$P(M|C) = \frac{P(C|M)P(M)}{P(C)}$$
to find $P(C)$ use the relation,
$$P(C)=P(C|M)P(M)+P(C|W)P(W)=0.05(0.5)+0.0025(0.5)=0.02625$$
and hence,
$$P(M|C)=\frac{0.05(0.5)}{0.02625}=0.9523$$
What if the population consisted of twice as many males as females
By this information we have that $P(M)=2P(F)$ or in other wor... | {
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"lm_q2_score": 0.8267117855317473,
"openwebmath_perplexity": 904.8880750394206,
"openwebmath_score": 0.8220222592353821,
"tags": nu... |
ros, quadcopter, topic, spawn
Comment by Geoff on 2017-04-25:
Using the stuff I discussed in my answer, I was able to spawn a quadrotor in the simulation, move it using the /cmd_vel topic, and then delete it. What topics or services do you want to call that are not present?
Comment by jasonwang538@gmail.com on 2017-07... | {
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"tags": "ros, quadcopter, topic, spawn",
"url": null
} |
thermodynamics, probability
$n \sigma v \, \Delta t$ if its speed was not affected by the collisions, and this number can be larger than 1.
However, let's now define what is meant by "the probability that the molecule has a collision in some small time interval $dt$" in the limit where $dt \rightarrow 0$. Using a freq... | {
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• Different but related question, perhaps some of the ideas there are helpful: math.stackexchange.com/questions/2879313/… – Servaes Dec 2 '18 at 18:57
• If there are two members that are in $6$ commisions, then they share at most one commission, and to fill these $11$ commissions then requires another $10\times9+1\time... | {
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"lm_q2_score": 0.8918110404058913,
"openwebmath_perplexity": 480.8203853774128,
"openwebmath_score": 0.827904999256134,
"tags... |
enzymes
The coenzyme must obviously interact with the protein, and in a way that leaves its catalytic or functional part free to operate. This is what the nucleotide portion of the coenzyme does — in fact it is performing the same role as has been suggested it played in the RNA world, but instead of interacting with a... | {
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"id": 7806,
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"openwebmath_score": null,
"tags": "enzymes",
"url": null
} |
java, programming-challenge
private static void addData(List<Integer> arrayList, String[] numbersToAdd){
for(String num : numbersToAdd){
arrayList.add(Integer.valueOf(num));
}
}
/**
* Calculates the number of students that make the lecture on time.
*
* @param student... | {
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"openwebmath_score": null,
"tags": "java, programming-challenge",
"url": null
} |
c++, beginner, object-oriented, physics, battle-simulation
// Displays the game introduction
class Startup
{
public:
void startup();
private:
};
#endif
DistAng.cpp
#include <iostream>
#include <math.h>
#include "distang.h"
using namespace std;
// Calculates distance and angle of shot
double DistAng::distAng(do... | {
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"tags": "c++, beginner, object-oriented, physics, battle-simulation",
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convert the angles into decimal degrees. It is the smallest angle that we can make from the terminal side of the angle. 4 Trigonometric Functions of General Angles 543 In general, if 0 is an angle measured in degrees, then 0 + 3600k, where k is any integer, is an angle coterminal with o. Example: Find a) sin 120° b) co... | {
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"lm_q1_score": 0.9883127447581986,
"lm_q1q2_score": 0.8400373512134626,
"lm_q2_score": 0.849971181358171,
"openwebmath_perplexity": 789.9586885075794,
"openwebmath_score": 0.7282557487487793,
... |
javascript, comparative-review, random
My re-write
function randomAtoZ() {
// Ranges calculated from data found at
// http://en.wikipedia.org/wiki/Letter_frequency
var lookup = {
a: 8167, b: 9659, c: 12441, d: 16694,
e: 29396, f: 31624, g: 33639, h: 39733,
i: 46699, j: 46852, k: 4... | {
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"id": 25501,
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"tags": "javascript, comparative-review, random",
"url": null
} |
python, performance, algorithm, programming-challenge, cellular-automata
new_states = [in_states[i-1] == in_states[i+1] for i in range(1, len(in_states) - 1)]
new_states.insert(in_states[1], 0)
new_states.append(in_states[-2])
However, insertion at the beginning of a list requires to update the entire list. A better ... | {
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"tags": "python, performance, algorithm, programming-challenge, cellular-automata",
"u... |
c#, recursion, unit-testing, tree
// No descendants have children. No recursion neeeded.
if (root.Children.All(x => x.Children.Count == 0))
{
return GetChildren();
}
// Some (or all) descendants have children. Use recursion
else
{
var allChildren ... | {
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"tags": "c#, recursion, unit-testing, tree",
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in fact, the Poincare conjecture is (roughly speaking) a statement about whether the fundamental group of a manifold determines if the manifold is a sphere. Sometimes we need to organize information with more than 2 dimensions, we call tensor an n-dimensional array. The $$\textit{nullity}$$ of a linear transformation i... | {
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"lm_q2_score": 0.8175744695262777,
"openwebmath_perplexity": 524.9600959979937,
"openwebmath_score": 0.6085191369056702,
... |
metric-tensor, renormalization, conformal-field-theory, effective-field-theory, superconformality
So how then did you apparently end up with finite distances after rescaling the fields? This must have to do with the fact that you did something more drastic than just reparameterizing $t$... you rescaled the action $S_0... | {
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"tags": "metric-tensor, renormalization, conformal-field-theory, effective-field-theory, su... |
quantum-algorithms, quantum-advantage
I'm a bit fuzzy on how much of this I got this right. But I'm still interested in learning! I also seriously doubt whether the circuit can be implemented in short-order in the NISQ-era, as at least the decoding step likely involves fault-tolerance. | {
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} |
classification, nlp, word-embeddings, machine-translation
fr eng trans
0 Agneau de lait Baby milk-fed lamb True
1 Agrume Blackcurrants False
2 Algue Buttermilk ... | {
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"tags": "classification, nlp, word-embeddings, machine-translation",
"url": null
} |
# Convert boolean expression into SOP and POS
Convert the following expression into SOP (sum of products) and POS (product of sums) canonical forms using boolean algebra method:
$(ac + b)(a + b'c) + ac$
Attempt at solution:
$(ac + b)(a + b'c) + ac$
1. $(a + b)(c + b)(a + b')(a + c) + ac$
2. $...$
3. $...$
I'm s... | {
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"lm_q1_score": 0.9790357640753516,
"lm_q1q2_score": 0.8379088762064089,
"lm_q2_score": 0.8558511414521922,
"openwebmath_perplexity": 389.73234315926794,
"openwebmath_score": 0.7091560363769531,
"ta... |
What are the important takeaways from this last two graphs? I would say this:
• If we get to play the Martingale system in an unrestricted manner, a very small percentage of players can reach very high net wins (before they then lose everything in an instant). In this particular example, we had two players go beyond 6... | {
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"lm_q1_score": 0.9835969684454966,
"lm_q1q2_score": 0.8018602117280685,
"lm_q2_score": 0.8152324960856175,
"openwebmath_perplexity": 556.5057910268125,
"openwebmath_score": 0.7240111827850342,
... |
python, rock-paper-scissors
if __name__ == '__main__':
game = RPS() Echoing all of VincentRG's points, with a little clarification and demonstration:
The only reason to wrap code in a if __name__ == '__main__' block is to keep it from being executed when your module is imported by another module. By that token, ... | {
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"tags": "python, rock-paper-scissors",
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} |
signal-analysis, fourier-transform, periodic
Which of the above arguments are correct and why? Please clarify. Thanks in advance. As you say, the constant function is periodic. A signal $x(t)$ is said to be periodic with period $p$ or to have a period $p$ if there exists a $p>0$ such that $x(t+p)=x(t)$ for all real nu... | {
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"openwebmath_score": null,
"tags": "signal-analysis, fourier-transform, periodic",
"url": null
} |
homework-and-exercises, optics
The main thing I don't understand is how the wavelength is effecting whether or not the light exits the prism. I believe this depends on whether or not the light is experiencing total internal reflection but in this scenario that would be given by $sin\theta _c=\frac{n_2}{n_1}$ I also kn... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, optics",
"url": null
} |
water, soil, pollution, groundwater, ecology
Negatively charged anions are interesting. They are generally poorly adsorbed by mineral surfaces so they are quite mobile in the subsurface compared to cations. Compounds of oxygen and other elements can form important anions like nitrate (NO3-) and sulfate (SO42-). My fav... | {
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"tags": "water, soil, pollution, groundwater, ecology",
"url": null
} |
we already have the area of the base face from last time the area of each face is (1/2)*b*h b = base of lateral face triangle = 12 h = height of lateral face triangle = 12
24. jim_thompson5910
the area of each lateral face is (1/2)*b*h b = base of lateral face triangle = 12 h = height of lateral face triangle = 12
2... | {
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"lm_q1q2_score": 0.8107317646649519,
"lm_q2_score": 0.8376199572530448,
"openwebmath_perplexity": 985.6836373422619,
"openwebmath_score": 0.7309746742248535,
"tags": ... |
# Number of groups
#### goosey00
##### Member
I am not quite sure if I am using the correct formula. The problem is -A class of 30 students(12 male and 18 female) are put into groups of 3. How many combinations can be formed if the requirement is that no group can be entirely male or female? I get 4060 since it doesn... | {
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"lm_q1_score": 0.9787126475856412,
"lm_q1q2_score": 0.8024399839905217,
"lm_q2_score": 0.8198933425148213,
"openwebmath_perplexity": 530.8549001789657,
"openwebmath_score": 0.7661325931549072,
"ta... |
sorting, swift, ios, hash-map
Breaking an outer loop
Instead of mutating the variable Done (which shouldn't be uppercased since it's an instance, not a class/type/struct/enum/etc), you can break from a nested loop this way:
OuterLoop: while true {
for i in imageUrlString {
...
if imageUrlString.cou... | {
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"openwebmath_score": null,
"tags": "sorting, swift, ios, hash-map",
"url": null
} |
the-sun, the-moon, atmospheric-effects
why is moonlight white through the atmosphere?
It seemed a nice clear sky last night around my neck of the woods and the Moon looked yellow to me. This will vary with your location and atmospheric conditions, but also with your personal perception of color. | {
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java, hash-map
In your result map, each key is an integer age, and the value for that key is a string with the names of all people at that age, separated by "and" if there is more than one person of that age. Your result map's pairs should be sorted in ascending order by age (keys). Include only ages between the min a... | {
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"openwebmath_score": null,
"tags": "java, hash-map",
"url": null
} |
ros
Hit http://packages.ros.org trusty Release.gpg
Hit http://packages.ros.org trusty Release
Hit http://packages.ros.org trusty/main amd64 Packages
Hit http://packages.ros.org trusty/main i386 Packages
Ign http://packages.ros.org trusty/main TranslationIndex
Ign http://packages.ros.org trusty/main Translation-en_US
... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros",
"url": null
} |
A. 45
B. 48
C. 49
D. 50
E. 52
Consider this picture:
The perimeter of square S is 40 implies each side of S is 10, which also means that diagonal of square S is 10. In the picture, the diagonals of square S, split square T into 4 isosceles right (45-45-90) triangles, which, as you know, have length ratios of $$x:x:x\... | {
"domain": "gmatclub.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9549844683997677,
"lm_q1q2_score": 0.8411475233043832,
"lm_q2_score": 0.880797071719777,
"openwebmath_perplexity": 2946.3746060219573,
"openwebmath_score": 0.798043966293335,
"tags"... |
If we have more than one relation for the speed up calculation we will use fixing bits by equations. Lets look at your your equations to see this:
$$k_{1} \oplus k_2 \oplus k_{63} = 1$$
$$k_{1} \oplus k_3 \oplus k_{17} = 1$$
$$k_{43} \oplus k_{56} \oplus k_{60} = 0$$
While iterating we if we know $$k_1$$ and $$k_2$... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9796676442828174,
"lm_q1q2_score": 0.8384496788071399,
"lm_q2_score": 0.8558511488056151,
"openwebmath_perplexity": 394.78822581111916,
"openwebmath_score": 0.769102931022644,
"tag... |
c++, c++11, io, stream
std::cout << "test2" << std::endl;
first_read = true;
std::ifstream infile2("/tmp/temp.bin", std::ios::in | std::ios::binary);
bytes_read = read_reserve(infile2, bd, 28, false); data_printer("bytes read: ", bd, bytes_read); data_printer("reserve: ", reserve.data(), RESERVE_SIZE);
bytes_r... | {
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"id": 35486,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, c++11, io, stream",
"url": null
} |
python, python-3.x, pygame, pong
def update(self):
if self.rect.collidepoint(self.rect.x, 0):
self.rect.y += SPEED_MULTIPLIER
elif self.rect.collidepoint(self.rect.x, SCREEN_HEIGHT):
self.rect.y -= SPEED_MULTIPLIER
class Ball(pygame.sprite.Sprite):
def __init__(self, x, y,... | {
"domain": "codereview.stackexchange",
"id": 45115,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, pygame, pong",
"url": null
} |
ros, c++, include
Originally posted by Almost on ROS Answers with karma: 25 on 2016-10-09
Post score: 0
For ROS message types, your observation is correct; the include file name is the package name and the message name.
Most packages will put their functions in a C++ namespace that matches the package name, so the na... | {
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"tags": "ros, c++, include",
"url": null
} |
algorithms, approximation, greedy-algorithms
Title: k-center problem: proof for Gon algorithm gives a 2-approximation The $k$-center problem is where we a given a graph $G(V,E)$, an integer $k$, a distance metric $d$ and we want to find a subset $C\subseteq V$ (such that $|C|\leq k$) which minimizes the following func... | {
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"id": 17966,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, approximation, greedy-algorithms",
"url": null
} |
redox, water, aqueous-solution, metal
$$\begin{align}-2.68~\mathrm{V} &> -0.0295~\mathrm{V} \times \mathrm{pH} + 0.177~\mathrm{V}\\
-2.86~\mathrm{V} &> -0.0295~\mathrm{V} \times \mathrm{pH}\\
96.9 &< \mathrm{pH}\end{align}\tag{11}$$
So we would need a $\mathrm{pH}$ value of almost $97$ to prevent the reaction from hap... | {
"domain": "chemistry.stackexchange",
"id": 6480,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "redox, water, aqueous-solution, metal",
"url": null
} |
c#, matrix, rags-to-riches
}
static int[,] ReverseMatrix(int[,] inputMatrix)
{
var outputMatrix = new int[inputMatrix.GetLength(0), inputMatrix.GetLength(1)];
var x = 0;
for (int i = inputMatrix.GetLength(0) - 1; i >= 0; i--)
{
var y = 0;
for (int j = inp... | {
"domain": "codereview.stackexchange",
"id": 10196,
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"openwebmath_score": null,
"tags": "c#, matrix, rags-to-riches",
"url": null
} |
slam, navigation, eigen
<!--depend package="octomap_server"/-->
<!--depend package="octomap"/-->
<depend package="geometry_msgs"/>
<depend package="visualization_msgs"/>
<rosdep name="libqt4-opengl-dev"/>
<rosdep name="libqt4-dev"/>
<rosdep name="libglew-dev"/>
<rosdep name="libdevil-dev"/>
<ro... | {
"domain": "robotics.stackexchange",
"id": 11742,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "slam, navigation, eigen",
"url": null
} |
dna, bioinformatics, proteins, sequence-analysis, sequence-alignment
Title: Codon alignment via Python? I have pairs of coding DNA sequences which I wish to perform pairwise codon alignments via Python, I have "half completed" the process.
So far..
I retrive pairs of orthologous DNA sequences from genbank using Biopy... | {
"domain": "biology.stackexchange",
"id": 1656,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "dna, bioinformatics, proteins, sequence-analysis, sequence-alignment",
"url": nul... |
organic-chemistry, stereochemistry
I have been going crazy trying to understand it. The things I do not understand are these,
1) I understand the diagrams on the right side. That I have been doing as well | {
"domain": "chemistry.stackexchange",
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"tags": "organic-chemistry, stereochemistry",
"url": null
} |
I am trying to find the minimal polynomial of $\beta$ over $\mathbb{F}_5$ which gives rise to the same extension $\mathbb{L}$, i.e. the polyomial $s(Z) \in \mathbb{F}_5[Z]$ such that $s(\beta)=0$.
$s(Z)$ should be of degree $4$ and $\mathbb{L}$, being the splitting field of $s(Z)$, will contain all its roots which are... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9702399034724604,
"lm_q1q2_score": 0.8064081505258598,
"lm_q2_score": 0.8311430478583168,
"openwebmath_perplexity": 80.74786005549113,
"openwebmath_score": 0.9688798785209656,
"tag... |
# Spider Problem Counting Socks and Shoes
Problem
A spider has one sock and one shoe for each of its eight legs. In how many different orders can the spider put on its socks and shoes, assuming that, on each leg, the sock must be put on before the shoe?
A) 8! (B) $$2^8$$ (C) $$(8!)^2$$ (D) $$\frac{16!}{2^8}$$ (E) 16... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9763105259435195,
"lm_q1q2_score": 0.8374480226208463,
"lm_q2_score": 0.8577680977182186,
"openwebmath_perplexity": 388.941991193225,
"openwebmath_score": 0.8219004273414612,
"tags... |
piping, pipelines, joining
Title: How does a union joint with two male threads work? How does union joint with two male threaded ends work? Does one male end rotate 360 degrees around it axis? How is the inside of the union constructed? Can I connect two pipes with female threads using a union joint and assemble/disas... | {
"domain": "engineering.stackexchange",
"id": 774,
"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": "piping, pipelines, joining",
"url": null
} |
shortest-path, minimum-spanning-tree, routing
Vehicle Routing Problem
I've thought of solving it as the Vehicle Routing Problem. A Capacitated Open Vehicle Routing Problem (COVRP) to be more exact. Drivers would act as the vehicle fleet and riders as the customers. A capacitated version because cars have limited seat... | {
"domain": "cs.stackexchange",
"id": 13489,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "shortest-path, minimum-spanning-tree, routing",
"url": null
} |
When using a language like Python it pays to know its limitations and faults, but they are limitations and faults of the computer system.
If you think you can design a computer system that doesn't have these limitations and faults, go to it. Python is open source. Nothing is stopping you from producing your own hacked ... | {
"domain": "physicsforums.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9585377249197138,
"lm_q1q2_score": 0.8310864879181072,
"lm_q2_score": 0.867035763237924,
"openwebmath_perplexity": 1133.3621353801454,
"openwebmath_score": 0.3675270676612854,
... |
Erosion of $$A$$ by $$B$$ can be represented as $$\cap_{b\in B} A_{-b}$$, meaning a intersection of all sets A translated by $$-b$$ for all $$b$$ in $$B$$.
Given the 2nd lemma - Convexity is closed under translation, so all the sets in the intersection are convex. Using that, and the 1st lemma - Convexity is closed un... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9693241974031599,
"lm_q1q2_score": 0.8098544110316891,
"lm_q2_score": 0.8354835391516133,
"openwebmath_perplexity": 157.28707787969188,
"openwebmath_score": 0.9305352568626404,
"ta... |
gravity, dark-energy, cosmological-horizon, doppler-effect, hubble-constant
But again, the CMB was emitted everywhere and the isotropic nature of CMB tells us that departures from uniformity are only up to seven parts in a million! Meaning, when the CMB was emitted 13.8 billion years minus 380,000 years ago, the mass ... | {
"domain": "astronomy.stackexchange",
"id": 2238,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "gravity, dark-energy, cosmological-horizon, doppler-effect, hubble-constant",
"... |
hilbert-space, operators, commutator, observables
Title: Are commuting operators a function of the other? Say you have 2 operators (can be assumed observable), does $[A,B]$ imply that either $B = f(A)$ or $A = f(B)$ for some function $f$?
This is true in the case of a spin-1/2 Hilbert space, as any observable can be d... | {
"domain": "physics.stackexchange",
"id": 91831,
"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": "hilbert-space, operators, commutator, observables",
"url": null
} |
computability, turing-machines, reductions, undecidability
Title: Is it decidable whether a Turing machine modifies the tape, on a particular input? Is $L=\{\langle M,w \rangle|M\text{ does not modify the tape on input w}\}$ decidable?
We could tell if a TM does not modify the tape on any input by checking if there ar... | {
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"id": 7872,
"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": "computability, turing-machines, reductions, undecidability",
"url": null
} |
java, console, calculator, finance
else {
if (taxableIncome > hohFiler[4].maxSalary && taxableIncome <= hohFiler[5].maxSalary) {
temp = taxableIncome - hohFiler[4].maxSalary;
totalTax = (hohFiler[4].maxSalary * hohFiler[4].taxRate) + temp * hohFiler[5].taxRate;
... | {
"domain": "codereview.stackexchange",
"id": 24081,
"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": "java, console, calculator, finance",
"url": null
} |
Another example illustrating the latter point is $A_i = \frac{1}{i} = \overline{A_i}$, then $0 \in \overline{B} \setminus \cup_{i=1}^\infty \overline{A_i}$.
- | {
"domain": "stackexchange.com",
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9724147153749275,
"lm_q1q2_score": 0.8226068762873381,
"lm_q2_score": 0.845942439250491,
"openwebmath_perplexity": 87.12278199537282,
"openwebmath_score": 0.9781647324562073,
"tags... |
python, r
Title: Is it possible to pass dataframes between R and Python using Arrow with zero-copy? Arrow is an in-memory format, so I can have a dataframe in Python backed by the arrow format. So the dataframe sits in memory, can I use that dataframe directly from R without making a copy of the dataframe? Imagine if ... | {
"domain": "datascience.stackexchange",
"id": 11624,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, r",
"url": null
} |
ros, rospy, parameter, ros-kinetic
class InterpolateThrottle:
def __init__(self):
self.rpm_input_topic = rospy.get_param('~rpm_input_topic', '/vesc/commands/motor/unsmoothed_speed')
self.rpm_output_left_topic = rospy.get_param('~rpm_output_left_topic', '/vesc/commands/motor/speed_left')
... | {
"domain": "robotics.stackexchange",
"id": 31888,
"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, rospy, parameter, ros-kinetic",
"url": null
} |
filters, filter-design, lowpass-filter, infinite-impulse-response
$$\alpha=\frac{1}{1+\tau/T}\tag{9}$$
Since the (continuous-time) $3\;\textrm{dB}$ cut-off frequency is $\Omega_c=1/\tau$, we obtain from $(9)$
$$\alpha=\frac{\Omega_cT}{1+\Omega_cT}\tag{10}$$
Equating the discrete-time cut-off frequency $\omega_c$ with ... | {
"domain": "dsp.stackexchange",
"id": 9844,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "filters, filter-design, lowpass-filter, infinite-impulse-response",
"url": null
} |
If $$X$$ is any non-closed subset of a space $$Y$$, the inclusion map $$i:X\to Y:x\mapsto x$$ gives a trivial example, since $$X$$ is a closed subset of itself.
Another trivial example is obtained by taking any infinite set $$X$$, letting $$\tau_d$$ be the discrete topology on $$X$$, and letting $$\tau$$ be any other ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9637799451753696,
"lm_q1q2_score": 0.8303332533914635,
"lm_q2_score": 0.8615382147637196,
"openwebmath_perplexity": 134.18812621193362,
"openwebmath_score": 0.9260371923446655,
"ta... |
python, python-3.x, algorithm, programming-challenge, mathematics
This converts the space complexity from O(log(limit, base = base)) to O(1). Over all limits in range(100000) and all bases in range(2, 1000), here is the difference:
original: 123.10s
revised: 52.56s
Also, your code is very clear (which is why I couldn... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, algorithm, programming-challenge, mathematics",
"url": nu... |
complexity-theory, knowledge-representation
NP is the set of decision problems for which the problem instances, where the answer is "yes", have proofs verifiable in polynomial time by a deterministic Turing machine.
listed first, and Google's featured result (via Britannica) has this version. This seems to be especia... | {
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"id": 20026,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "complexity-theory, knowledge-representation",
"url": null
} |
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