text stringlengths 1 1.11k | source dict |
|---|---|
c++, algorithm, haskell
I wonder if there are ways to make this cleaner without changing back into a worse complexity class.
I'd be happy about any kind of feedback - thank you in advance already! solutionNaive :: String -> String
solutionNaive xs = maximumBy (comparing length) $ map (takeWhileUnique S.empty) $ tails ... | {
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quantum-mechanics, quantum-entanglement, identical-particles
Nevertheless, Killoran, Cramer and Plenio (arXiv link) showed that this is indeed a genuine form of entanglement. That is, the entanglement formally associated with the symmetrised wave function of a system of indistinguishable bosons can be extracted into t... | {
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"url": null
} |
fft, digital-communications, ofdm, ifft, numpy
Exactly! In real-world OFDM systems, not all carriers are used; typically, you leave out one or two DC carriers and leave a few guard carriers at the band edges, so you'd have something like
split my M samples into 1950-sized chunks, and map them to the elements of a 20... | {
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"tags": "fft, digital-communications, ofdm, ifft, numpy",
"url": null
} |
turtlebot, ros-fuerte, environment, explore, package
Original comments
Comment by Zayin on 2013-06-11:
I'm glad my package worked for you (and on Groovy on top of that)! I'm happy my work has shown to be useful after all the questions I've asked here lol. Anyway, I'll try your suggestion and post the outcome. Thanks!
... | {
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"url": null
} |
navigation, turtlebot, costmap
inflation_layer:
enabled: true
inflation_radius: 0.1
obstacle_layer:
enabled: true
origin_z: 0.0
z_voxels: 2
max_obstacle_height: 1.4
observation_sources: scan bump
scan:
data_type: LaserScan
topic: scan_filtered
marking:... | {
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"tags": "navigation, turtlebot, costmap",
"url": null
} |
matlab, filters, autoregressive-model
As you may notice, there is a pole near $z=2$ (more precisely at approximately 1.96595) when $a=1$ which indicates that the system is not stable. On the other hand, when $a=0.1$, all the poles are located inside the unit circle and the system is stable. Beware that even with $a=0.... | {
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Originally Posted by TheEmptySet
The function $y=\sec^2(x^2)$ if the composition of 3 functions. This means you need to use the chain rule.
This can be seen as
$y=s^2 \implies \frac{dy}{ds}=2s$
$s=sec(t) \implies \frac{ds}{dt}=\sec(t)\tan(t)$
$t=x^2 \implies \frac{dt}{dx}=2x$
So the chain rule tells us the derivativ... | {
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"tag... |
algorithms
I have elements [(1,1), (2,2), (1,2), (3,2)],
My queries are [(1,1), (2,2), (3,3)]
The program should return [1,3,4].
This is for a past competitive programming challenge (WiFi Network problem in this competition) A 2D Fenwick tree can solve this in $O(\log^2 N)$ time and $O(N^2)$ space for both update and... | {
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"tags": "algorithms",
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} |
newtonian-mechanics, harmonic-oscillator, spring, free-body-diagram, equilibrium
Title: Why is the restoring force not zero at the equilibrium position of simple harmonic motion? The restoring force is applied in order to take the body it's equilibrium. Then in a SHM why in the mean position restoring force maximum ra... | {
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"tags": "newtonian-mechanics, harmonic-oscillator, spring, free-body-diagram, equilibrium",... |
java, plugin, minecraft
Documentation (Javadoc) defines the contract of what it documents. The Javadoc on a class, for example, describes what the purpose of the class is and can even give examples on how to use it. On a method, Javadoc describes what the method should be used for, along with its parameters, return ty... | {
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"tags": "java, plugin, minecraft",
"url": null
} |
electromagnetic-radiation, laser, home-experiment, luminosity
Because of this mechanism the light emitted is always a longer wavelength/lower energy than the light you need to excite the phosphor. You don't say what colour light the ball emits, but if it uses strontium aluminate it will be a slightly bluey green colou... | {
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"tags": "electromagnetic-radiation, laser, home-experiment, luminosity",
"url": null
} |
python, keras, tensorflow, gradient-descent
Next goes callback to save the Keras model weights at some frequency. According to Keras docs:
save_freq: 'epoch' or integer. When using 'epoch', the callback should save the model after each epoch.
When using integer, the callback should save the model at end of this many ... | {
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"tags": "python, keras, tensorflow, gradient-descent",
"url": null
} |
But, the definition of unit impulse function states that it gives a value of 1 at t=0 and 0 elsewhere. In the work, we discussed augmented reality virtual glasses try-on technology on iOS platform to achieve optimal purchase of online glasses, improving try-on speed of virtual glasses, user senses of reality, and immer... | {
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"lm_q2_score": 0.8198933359135361,
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"openwebmath_score": 0.8094708919525146... |
machine-learning, predictive-modeling, time-series, cross-validation
# the function returns the mean of the accuracy on the n-1 folds
return accuracies.mean()
If on the other hand, you prefer R you can explore the timeslice method in the caret package and make use of the following code:
library(caret)
library(gg... | {
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haskell
Update:
Thinking over dave4420's comments, I decided to redo the entire algorithm. I think that it fixes most of the bugs.
ssearch _ [] = 0
ssearch [] _ = 0
ssearch (hay:haystack) (needle:needles)
| hay == '*' = error "no '*' allowed in hay" --no confusion with wildcard things
| needle == '*' = ssearch (ha... | {
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javascript, game, ecmascript-6, dom, snake-game
const could be used more for any variable that doesn’t get reassigned, like pos in the callback of Snake.draw()
The method Snake. checkCollision() could be simplified to return the result of calling .some() (without storing it in selfCollision) and the callback functio... | {
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"tags": "javascript, game, ecmascript-6, dom, snake-game",
"url": null
} |
javascript, jquery, html, css, twitter-bootstrap
You have a number of these blocks that seem all copy pasted:
<!-- Sargent -->
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
Sargent
<a href="https://m-nucuisine.sodexomyway.com/images/Sargent3... | {
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"tags": "javascript, jquery, html, css, twitter-bootstrap",
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c#, asp.net-mvc
var builder = new TagBuilder("li")
{
InnerHtml = content
};
if (String.Equals(action, currentAction as string,
StringComparison.OrdinalIgnoreCase)
&&
String.Equals(controller, currentController as string,
St... | {
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"tags": "c#, asp.net-mvc",
"url": null
} |
python-3.x, web-scraping
Title: Check if new dict values has been added I have been working on creating a scraper that auto detects if there is any changes on a website as example as there is a release date or a increas/decrease of size value.
I have created couple of files where I have:
product_monitoring.py - The br... | {
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"tags": "python-3.x, web-scraping",
"url": null
} |
cell-biology, carbohydrates
Title: Cellulose - why is it fibrous and not granular?
I was reading a book where it said that the 1 - 4 Glycosidic bond of the Beta Glucose meant that cellulose is fibrous and not granular.
First, what does it mean to be granular and why is not granular unlike Amylose?
Thanks, Dave. Cool ... | {
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"tags": "cell-biology, carbohydrates",
"url": null
} |
statistical-mechanics, diffusion
$S(\Delta,t)$ is a simple function which is essentially just the error function:
$$ S(\Delta,t) = ( {2\over \sqrt{\pi}} \mathrm{erf}({\Delta \over \sqrt{2t}})) $$
It's only a function of ${\Delta \over\sqrt{t}}$ by scaling. The probability density of a collision at time t is found by d... | {
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nao
Call Stack (most recent call first):
nao_extras/nao_teleop/CMakeLists.txt:13 (find_package)
-- Configuring incomplete, errors occurred!
Can anyone help me to solve this problem? Thanks
Originally posted by marcofe on ROS Answers with karma: 35 on 2015-12-16
Post score: 0
You are missing the naoqi_bridge_m... | {
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} |
mathematics, crystals
Title: Working with the definition of periodic function I'm exploring periodic conditions and I'm stuck in a problem. Given that $m\cdot L_1 = n \cdot L_2$, we have two periodic functions $f_1$ and $f_2$ with periods $L_1$ and $L_2$ where we can find, for example that $f_1(x+m\cdot L_1) = f_1(x)$... | {
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"tags": "mathematics, crystals",
"url": null
} |
species-identification, zoology, invertebrates, limnology
Finally, here's one more clip showing off how fast they can be when they want to (I swear it's not even sped up!). I wasn't able to get it back under the microscope at this point.
Does anyone know what these are, or at least what kinds of worms they might be re... | {
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ros, ros2, ros-melodic
I’m not going to be able to get to all of that detail, but I think it boils down to why isn’t ROS used in specifically your corner of the robotics world, industrial automation.
Industrial automation is used to buying a black box that does XYZ (controllers, PLCs, etc) and you buy N black boxes to... | {
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c++, edit-distance, opencv, video
vid.read(pastFrame);
while (vid.read(curFrame)) {
for (int i = 0; i < curFrame.rows; i += 1) {
cv::Vec3b* curPixel = curFrame.ptr<cv::Vec3b>(i);
cv::Vec3b* pastPixel = pastFrame.ptr<cv::Vec3b>(i);
for (int j = 0; j < curFrame.cols; j += ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, edit-distance, opencv, video",
"url": null
} |
php, pdo, stackexchange, svg
return $json;
}
function useData($data) {
header('Content-type: image/svg+xml; charset=utf-8');
$is_answered = $data['text'];
$text = 'reviewed';
if (isset($data['accepted_answer_id']) && $data['accepted_answer_id'] != 0) {
$color = '97ca00';
$mode = 'views... | {
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"url": null
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lagrangian-formalism, field-theory, gauge-theory, gauge-invariance
$$\mathcal{D}_\mu=\partial_{\mu} +iqA_\mu$$
I mean does the electromagnetic gauge transformation induce the $U(1)$ complex scalar field gauge transformation in some manner? Are $\alpha(x)$ and $\Lambda$ somehow connected or can we apply them as two sep... | {
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java, algorithm, strings, recursion
Your test for letters[start] == null does not seems necessary if the letters array is well-behaved (i.e., does not contain null).
Recursion is a decent way to solve this problem.
Your bug comes from the fact that when you process "-" as a digit, you generate null in letters. When pr... | {
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"openwebmath_score": null,
"tags": "java, algorithm, strings, recursion",
"url": null
} |
c++, bitwise, integer
template <typename T> T & operator%=(T & lhs, integer rhs){
lhs = lhs % rhs;
return lhs;
}
// IO Operator
std::ostream & operator<<(std::ostream & stream, integer rhs){
std::string out = "";
if (rhs == 0)
out = "0";
else {
int div = 10;
if (stream.fla... | {
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java, interview-questions
That's a new way of arranging else that I haven't seen before.
if(hasNext())
{
visited.add(this);
At first glance, it seems odd that this line isn't outside of the if-block. I can see that it doesn't matter. However, at least a comment explaining why you've put it here.
... | {
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string-theory, conformal-field-theory
Now, why is $:e^{ik.X(0, 0)}:$ not used in computing string S-matrix elements?
The answer is that any S-matrix element must be invariant under Weyl and diffeormphism transformations, something like $$S(k)= \sum_{compact \\ topologies} \int \frac{[dXdg]}{V_{diff \times Weyl}} exp(... | {
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time, conventions, si-units, metrology
This leaves the second to be defined, as in your question's title. Currently the second is defined as (quoting from Wikipedia) | {
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quantum-mechanics, harmonic-oscillator, coordinate-systems
certainly give an eigenvalue $E=2$ and the resulting state will be the projection of initial state in the subspace spanned by
$(n'_x=1,n'_y=0)$ and $(n'_x=0,n'_y=1)$.
I leave for you to find that projection. (Hint: express $n_x$ as a
linear combination of $n'_... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, harmonic-oscillator, coordinate-systems",
"url": null
} |
general-relativity, forces, gravity, spacetime, geodesics
(From an unassessed comment in the internet)
OK so I love this too, but is it a completely looney description or does it make any sense in which case I'm in for some serious enlightenment today since last time I checked light cones allowed me to move somewhat f... | {
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"tags": "general-relativity, forces, gravity, spacetime, geodesics",
"url": null
} |
general-relativity, fluid-dynamics, cosmology, terminology, stress-energy-momentum-tensor
Title: Physical meaning of the space-space components $T^{ij}$ of the stress-energy tensor $T^{\mu\nu}$ The time-time component $T^{00}$ and the time-space components $T^{0i}$ of the energy-momentum tensor $T^{\mu\nu}$ are respe... | {
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"tags": "general-relativity, fluid-dynamics, cosmology, terminology, stress-energy-momentum... |
php, beginner, validation, library
if ( $not ) {
if ( $fields[ $matches[ 1 ] ] == $matches[ 2 ] && $fields[ $matches[ 3 ] ] == $matches[ 4 ] ) {
continue;
}
} else {
if ( $fields[ $matches[ 1 ] ] != ... | {
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"tags": "php, beginner, validation, library",
"url": null
} |
lagrangian-formalism, field-theory, vectors, notation
$$
\dfrac{\partial \mathcal{L}}{\partial x'^\mu} = \dfrac{\partial x^\nu}{\partial x'^\mu} \dfrac{\partial \mathcal{L}}{\partial x^\nu}
$$ | {
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"tags": "lagrangian-formalism, field-theory, vectors, notation",
"url": null
} |
angular.js, authentication, coffeescript
This is where it gets ugly. I'll eventually just change this into a loginCheck() function but I hate the logic so much; too many if statements. Also, this barely works, so I could use the improvements.
$rootScope.$on('$stateChangeStart', (event, toState) ->
# Checks if a pa... | {
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"tags": "angular.js, authentication, coffeescript",
"url": null
} |
Out[21]:
5
In [31]:
distinctNumWays(60)
Out[31]:
966467
In [36]:
distinctNumWaysFast(60)
Out[36]:
966467
### Last example: figuring out how to have the most fun at parties¶
As asked yesterday: we saw how to figure out how to optimize a function using recursion/memoization, but what if we want to remember the decisi... | {
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"tags": nu... |
python, pandas, dataframe
out_cost_price_dist = stock_cost_price['DistributorUUID']
out_cost_price_stock = stock_cost_price['Stock']
out_cost_price_expected = stock_cost_price['Expected']
out_cost_price_country = stock_cost_price['Country']
out_cost_price_real_dist = s... | {
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"url": null
} |
plot(time, distance, "g--", label = "position")
plot(time, velocity, "b-", label= "velocity")
legend(loc='upper left')
xlabel("Time(s)")
title("Velocity vs Time and Distance vs Time")
show()
Is the code correct ? or Does it looks like a good code in terms of implementation of the trapezoidal rule ?
Related Engineerin... | {
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"openwebmath_score": 0.6231268644332886,
"tags... |
thermodynamics, refrigeration
Title: 1 Ton of Refrigeration "1 TR is equivalent to the rate of heat transfer needed to produce 1 U.S. ton (2000 lbs) of ice at 32F from water at 32F in one day, i.e., 24 hours."
While defining 1 Ton of Refrigeration (TR), why doesn't some specific value of pressure come into definition?... | {
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"tags": "thermodynamics, refrigeration",
"url": null
} |
javascript, jquery
<div class="inputWraper clearfix">
<input type = "radio"
name = "scianyDzialowe"
id = "par02par02"
value = "" />
<label id="par02... | {
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"tags": "javascript, jquery",
"url": null
} |
electromagnetism, aircraft, propulsion
The first layer is easy -- conservation of energy. Any energy that you put into the compressor blades from the maglev system must come from somewhere. That "somewhere" is another engine, such as the APU. All you do in this case is rob Peter to pay Paul. However, it's even wor... | {
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"tags": "electromagnetism, aircraft, propulsion",
"url": null
} |
redox, water, experimental-chemistry
Edit
I had a beaker with the nail in it, leaning upright against the wall of the beaker. I put about 200 ml of water in, then about 50–100 ml of oil. The water didn't completely cover it, but the oil did. After 4 weeks, there was rust, mostly situated around (but below) the oil/wat... | {
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"openwebmath_score": null,
"tags": "redox, water, experimental-chemistry",
"url": null
} |
proof-techniques, correctness-proof
I rechecked sum rule of differentiation.
And i can not understand where is this wrong.
Any Tips ?
I think that the second line
x^2 = x + x +... x times...
being used for differentiation is wrong. but i am not sure . The proof states that $(\underbrace{x+x+\dots+x}_{x~ times})' = (... | {
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"openwebmath_score": null,
"tags": "proof-techniques, correctness-proof",
"url": null
} |
python, beginner, adventure-game, battle-simulation
Title: Text-based adventure and combat game I'm new to coding and this is a text based adventure game with combat. Sleep and choice functions based on idea from https://codereview.stackexchange.com/a/52292/179642. Map idea from Codecademy battleship tutorial.
The act... | {
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"tags": "python, beginner, adventure-game, battle-simulation",
"url": null
} |
phase-transition, topology, gluons, pions
Outside the confinement scale, you only have color-singlet hadrons, and the "cheapest" ones to make are the ones requiring the least energy, the light ones, the pions. These provide the main dynamo behind the binding of nuclei, but the other mesons (vector, scalar, etc...) cru... | {
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"openwebmath_score": null,
"tags": "phase-transition, topology, gluons, pions",
"url": null
} |
energy, energy-conservation, potential-energy
This is what I don't understand. If work is how much energy the object
receives and in a closed system like this one the total amount of
energy is constant. Shouldn't the net work be $0$? | {
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"tags": "energy, energy-conservation, potential-energy",
"url": null
} |
floating-point, integers, number-formats
I don't see why for 63 iterations of the loop, we have (float)lbnd == (float)ubnd. It has something to do with the conversion of integers to floats, but I don't know what. I know that integers and floats both have 32 bits, but there must be a different way of storing them. Coul... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "floating-point, integers, number-formats",
"url": null
} |
linear-algebra, tensor-calculus
$$T(\alpha,\beta,X) = T^{\mu\nu}_{\rho}\, \alpha(e_\mu)\, \beta(e_\nu)\, f^\rho(X)$$
I am not sure how to generalise from here. Apologies if this is really obvious. You have the right idea--by the time you're at your last step, everything is just numbers. At this point, just einstein s... | {
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"tags": "linear-algebra, tensor-calculus",
"url": null
} |
optics, visible-light, diffraction, vision
So, why do I see with my own eyes three beams whereas with a camera there appear to be more? Thanks to agweber's comment which pointed me this Youtube video, I found the right solution: The cause of this effect are the so called suture lines.
A sketch of the lens and these l... | {
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"tags": "optics, visible-light, diffraction, vision",
"url": null
} |
ros
public:
//!Ros node initialization
talker(ros::NodeHandle n){
// //n_ =n;
// chatter_pub = n.advertise<brics_actuator::JointVelocities>("/arm_controller/command_vel", 10);
}
//! Loop forever while sending drive commands based on keyboard input
bool driveKeyboard()
{
std::cout << "Ty... | {
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"tags": "ros",
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} |
observational-astronomy, amateur-observing, satellite
There have also been a few specific questions about constellations of satellites and astronomical instruments here and they reference Starlink.
However, the following question has not yet been asked point-blank: How Will Starlink Affect Observational Astronomy? Is ... | {
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"id": 4269,
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"tags": "observational-astronomy, amateur-observing, satellite",
"url": null
} |
# shortcut to find eigenvalues of 2x2 matrix
Posted by & filed under Uncategorized . | {
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"openwebmath_score": 0.751849889755249,
"tags"... |
cc.complexity-theory, reference-request, co.combinatorics, cg.comp-geom, time-complexity
Title: Multidimensional arithmetic progression variant For $\vec{d} \in \mathbb{N}^n$, let $Q(\vec{d}) \subset \mathbb{N}^n$ be the set of vertices of the $n$-dimensional cube scaled in the direction of the $i$-th coordinate by $d... | {
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"id": 2650,
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"lm_q1_score": null,
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"openwebmath_score": null,
"tags": "cc.complexity-theory, reference-request, co.combinatorics, cg.comp-geom, time-comp... |
newtonian-mechanics, classical-mechanics, spring, reversibility, dissipation
Title: Explanation of a spring using "Artistotle's law of motion", $\vec{F}=m\vec{v}$ So I was watching Susskind's Classical Mechanics lectures and I didn't understand something in the second lecture.
He was telling about Aristotle's Law of m... | {
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"tags": "newtonian-mechanics, classical-mechanics, spring, reversibility, dissipation",
"... |
thermodynamics
Under subcritical conditions, a given temperature and pressure will give three roots. The largest is the vapor volume, the smallest is the liquid volume and the middle one is an unstable state that must exist along with the vapor and liquid roots. By using appropriate integrated forms we can compare t... | {
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"openwebmath_score": null,
"tags": "thermodynamics",
"url": null
} |
telescopes, satellites, gyroscopes
Title: How do we stabilise satellites so precisely? Look at the Hubble Ultra Deep Field photo. The stars in it are on the order of 1 arcsecond across. To an order of magnitude, this is $10^{-6}$ radians in a $10\text m$ telescope which was held steady for $10^6$ seconds.
In other wor... | {
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"id": 18930,
"lm_label": null,
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"lm_q1q2_score": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "telescopes, satellites, gyroscopes",
"url": null
} |
correlation-functions
They implement the same functionality, but they are clearly different. One is a simple linear filter, the other is a nonlinear operation (mixing) followed by integration. The correlation receiver is much more common in analog, since it is very complicated to design an analog filter whose impulse ... | {
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"openwebmath_score": null,
"tags": "correlation-functions",
"url": null
} |
quantum-field-theory, string-theory, quantum-gravity, topological-field-theory, chern-simons-theory
Please feel free give Reference. And make sure that your answer is to my point Q1-4. Even though standard, there is an unfortunate confusion caused by the way the term "spin connection" is used in the physics literature... | {
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"tags": "quantum-field-theory, string-theory, quantum-gravity, topological-field-theory, ch... |
c#, multithreading, .net, httpclient
var token = await response.Content.ReadAsAsync<TokenInformation>();
lock (_lock)
{
_token = token;
}
}
return _token.Token;
}
}
public class EmployeeServiceClient
{
private HttpClient _httpClient;
p... | {
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"tags": "c#, multithreading, .net, httpclient",
"url": null
} |
____________________________________________________________________
The normality in the powers of $X$
We have established that $\prod_{\alpha<\omega_1} \omega_1=\omega_1^{\omega_1}$ is not normal. Hence any higher uncountable power of $\omega_1$ is not normal. We have also established that $\prod_{\alpha<\omega} \o... | {
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"lm_q1_score": 0.9920620049598216,
"lm_q1q2_score": 0.8016527754339622,
"lm_q2_score": 0.808067208930584,
"openwebmath_perplexity": 7027.181819724902,
"openwebmath_score": 1.0000100135803223,
"tags... |
javascript, mongodb, express.js, modules, ecmascript-8
exports.editPost = async (req, res, next) => {
const postId = req.params.id;
Post.findById(postId, function(err, post) {
const categories = Category.find({}, (err, categories) => {
if (err) {
console.log('Error: ', err)... | {
"domain": "codereview.stackexchange",
"id": 39744,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, mongodb, express.js, modules, ecmascript-8",
"url": null
} |
complexity-theory, np-complete, optimization, np-hard, np
How does this make sense as a matrix (of finite dimensions!)?
Given everything above how is it obvious that this matrix $M_n$ is a submatrix of some slack matrix of the correlation polytope $conv(\{ xx^T \vert x \in\{0,1\}^n \})$ ? Every quadratic multilinear... | {
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"openwebmath_score": null,
"tags": "complexity-theory, np-complete, optimization, np-hard, np",
"url": null
} |
gazebo, ros-indigo
auto-starting new master
process[master]: started with pid [19700]
ROS_MASTER_URI=http://localhost:11311
setting /run_id to 68c77ab0-7d9e-11e6-8601-88532e0c5102
process[rosout-1]: started with pid [19713]
started core service [/rosout]
process[gazebo-2]: started with pid [19728]
process[gazebo_gui-... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, ros-indigo",
"url": null
} |
beginner, scala, file-system
Title: Processing files in a directory tree I'm new to Scala, and would appreciate any notes about a better approach, correctness, or style.
/**
* Call proc(f) for each file in the directory tree rooted at dir.
*
* proc will not be called for directories, just for files.
*/
def traver... | {
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"tags": "beginner, scala, file-system",
"url": null
} |
python, python-3.x, object-oriented
This gets the following. There's some more changes that can be made, but the base of your code is good.
class Agent:
def __init__(self, identification, productivity, wealth, preferences, age, health, alive, sex):
self.identification = identification
self.producti... | {
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"tags": "python, python-3.x, object-oriented",
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Can this min-max problem be analytically solved? What would be the corresponding optimal strategy then?
For scenario 1, my intuition is to use bisection search, which, at worst, costs $$\10$$ ($$2^{10}=1024$$). But I cannot prove this is indeed optimal. For the second scenario, since making an under-guess means a high... | {
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"lm_q2_score": 0.865224084314688,
"openwebmath_perplexity": 310.330390901041,
"openwebmath_score": 0.8868332505226135,
"tags"... |
is of great importance, some situations may require different dynamic objectives such as maximum eigenvalue separation [17],. The proposed approach drastically reduces the coherence time requirements, enhancing the potential of quantum resources available today and in the near future. Subsection 3. The spectrum of eige... | {
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"lm_q1_score": 0.9915543725597269,
"lm_q1q2_score": 0.8765730062417967,
"lm_q2_score": 0.8840392725805823,
"openwebmath_perplexity": 409.031974205775,
"openwebmath_score": 0.8604814410209656,
"tags": nul... |
deep-learning, convolution
As far as I know, the width and the height should be a figure divisible by 2, in order to use a pooling layer. However, I don't understand why the depth must be a figure divisible by 2. The pooling layer just operates on a 2-dimensional screen based on width and height, and it operates on ea... | {
"domain": "datascience.stackexchange",
"id": 1829,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "deep-learning, convolution",
"url": null
} |
image-processing, matlab, interpolation
Without loss of generality, we can assume that we are interpolating between $x=0$ and $x=1$. On the left and right boundaries, we see that
$$f(0) = d$$
$$f(1) = a+b+c+d$$
$$f'(0) = c$$
$$f'(1) = 3a+2b+c$$
Solving for the polynomial coefficients
$$a = 2f(0) - 2f(1) + f'(0) + f'(... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-processing, matlab, interpolation",
"url": null
} |
viterbi-algorithm
-30 59 23
-31 54 22
-32 50 21
-33 44 20
-34 42 21
-35 41 21
-36 43 ... | {
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"openwebmath_score": null,
"tags": "viterbi-algorithm",
"url": null
} |
c++, beginner
Person person;
while (mysamefile >> person) {
people.push_back(std::move(person));
}
(The std::move() is a non-essential optimisation - it says we won't be using person until it's re-written using >>).
When displaying the people, we can make the code simpler using range-based for like this:
for (co... | {
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"tags": "c++, beginner",
"url": null
} |
My question is, can there be a differential equation (of order 1) such that given an initial condition, can acquire an infinite number of solutions? The answer to this question should be able to shed light as to the mechanism through which the equation acquires more than one solution.
Title: Re: Can there exists infini... | {
"domain": "toronto.edu",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754470129647,
"lm_q1q2_score": 0.8639420955464375,
"lm_q2_score": 0.8774767826757123,
"openwebmath_perplexity": 839.2738191865103,
"openwebmath_score": 0.9042200446128845,
"tags"... |
$V=(a\times b)\cdot c$
(Note that this is a generalization of $|a\times b|$ being the area of the parallelogram defined by $a$ and $b$.)
-
There's nothing special about 2d/3d here; this means of finding the angle between vectors applies to an arbitrary number of dimensions. – Muphrid Jun 8 '13 at 15:50
@Muphrid: Of ... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9890130575313262,
"lm_q1q2_score": 0.8502186725627057,
"lm_q2_score": 0.8596637487122112,
"openwebmath_perplexity": 177.29955373726372,
"openwebmath_score": 0.9262725710868835,
"ta... |
electromagnetism, special-relativity, charge, si-units
Title: Reason Why 1 Coulomb was redefined in SI unit system? Since current can be calculated as $I = q/t$, the original definition of 1 Coulomb in SI unit system was that it is such amount of charge which flows through wire cross-section having current of $1 A$ i... | {
"domain": "physics.stackexchange",
"id": 99801,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, special-relativity, charge, si-units",
"url": null
} |
ros, message
Title: How do I check if a ROS message has changed?
Hi,
I'm trying to write a unit test that tests converting between some messages types and one of the things I'd like to do is have a test that fails if the message's .msg file has changed at all (this is because it's important that the conversion functi... | {
"domain": "robotics.stackexchange",
"id": 17883,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, message",
"url": null
} |
Editors, IDE and Terminals in the cloud where you can Edit, Compile, Execute and Share your source code with the help of simple clicks. Example 1 We evaluate the iterated integral. Matlab (Matrix Laboratory) was born from the LINPACK routines written for use with C and Fortran. I am trying to evaluate a triple integral... | {
"domain": "nemservices.in",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9736446494481299,
"lm_q1q2_score": 0.817602486536482,
"lm_q2_score": 0.83973396967765,
"openwebmath_perplexity": 834.2711683552066,
"openwebmath_score": 0.7501841187477112,
"tags"... |
functional-programming, typescript, wrapper
public login(options: a0.DefaultLoginOptions): Promise<any> {
return new Promise((resolve, reject) => this.wa.login(options, cb(resolve, reject)));
}
public oauthToken(options: any): Promise<any> {
return new Promise((resolve, reject) => this.wa.oauthToken(optio... | {
"domain": "codereview.stackexchange",
"id": 27686,
"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": "functional-programming, typescript, wrapper",
"url": null
} |
javascript, node.js
Title: Uploading a file from web-based platform to S3 bucket using NodeJS - Callback Hell This code checks user permissions for uploading file, and if user can upload, then the file undergoes a check to see if it exists in SharePoint. If so then the file is pulled and uploaded to S3 bucket. This al... | {
"domain": "codereview.stackexchange",
"id": 36646,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, node.js",
"url": null
} |
minimax, game-theory, optimality
Title: How to make minimax optimal? By optimal I mean that:
If max has a winning strategy then minimax will return the strategy for max with the fewest number of moves to win.
If min has a winning strategy then minimax will return the strategy for max with the most number of moves to ... | {
"domain": "ai.stackexchange",
"id": 387,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "minimax, game-theory, optimality",
"url": null
} |
phase, finite-impulse-response, linear-phase, minimum-phase
I would like to end up with a single FIR of linear phase. If the magnitude ends up being squared during the process (or the number of taps double), then that would be OK. It is generally impossible to transform a given minimum-phase FIR system into a linear p... | {
"domain": "dsp.stackexchange",
"id": 4153,
"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": "phase, finite-impulse-response, linear-phase, minimum-phase",
"url": null
} |
observational-astronomy, solar-system, data-analysis, fundamental-astronomy
My question is:
On what basis is the information about the distance and velocity of the Voyager probes determined? Is this done by analysis of the data we receive from the probes? Or, are these values calculated based upon our current understa... | {
"domain": "astronomy.stackexchange",
"id": 5723,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "observational-astronomy, solar-system, data-analysis, fundamental-astronomy",
"... |
c
void sstream_pushFrontStr(sstream* str, sstream* new) {
if(str->capacity < (str->length + new->length + 1)) { //+1 \0
char* temp = realloc(sstream_get(str),str->capacity * 2);
str->capacity = str->capacity * 2;
str->buffer = temp;
if(str->capacity < (str->length + new->length + 1)... | {
"domain": "codereview.stackexchange",
"id": 41296,
"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": "c",
"url": null
} |
python, performance, python-3.x
def read_foods(foods):
for food in foods:
name, *other = food.split('/')
yield Food(name, *[float(v) for v in other]) | {
"domain": "codereview.stackexchange",
"id": 33928,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, python-3.x",
"url": null
} |
equation In x3-3x2-4x+12 = 0? We have seen that every cubic polynomial has at least one root and that by a change of variable we can reduce the problem of finding a root of a giv cubic polynomial r3+br2+cr+d to the problem of finding a root of a cubic polynomial of the form y +pytg. Fold a line placing P1 onto L1 and p... | {
"domain": "venetoacquaeterme.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9871787827157819,
"lm_q1q2_score": 0.9019620741188116,
"lm_q2_score": 0.9136765193002482,
"openwebmath_perplexity": 460.93382348864924,
"openwebmath_score": 0.7340618371963501,
... |
statistical-mechanics, resource-recommendations, path-integral, second-quantization
Title: Path integrals on statistical mechanics I'm looking for references covering the following topics: path integrals in statistical mechanics and Wick rotations, second quantization, fermionic systems and Ising-like models and mean ... | {
"domain": "physics.stackexchange",
"id": 69942,
"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": "statistical-mechanics, resource-recommendations, path-integral, second-quantizatio... |
electromagnetism, optics, waves, visible-light, reflection
The problem is solving for the $z$-dependence of the electric field. But why only have $\textbf{e}(z)$ and not $\textbf{e}(x,y,z)$? If we can assume an $\exp[i q (x \cos \psi + y \sin \psi)]$ form for $x$ and $y$, why not for $z$? Generalizing, could we have a... | {
"domain": "physics.stackexchange",
"id": 86844,
"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": "electromagnetism, optics, waves, visible-light, reflection",
"url": null
} |
sql, sql-server, stored-procedure
IF (@ReturnVal <> 1)
BEGIN
PRINT 'Role: ' + @NewRoleName +' not set up in this database.';
RETURN;
END
ELSE
BEGIN
-- get the list of all permissions for the OldRole
CREATE TABLE #OldPermissions
(
... | {
"domain": "codereview.stackexchange",
"id": 12971,
"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": "sql, sql-server, stored-procedure",
"url": null
} |
navigation, mapping, rviz, nodes, hector-mapping
Title: Why can´t I open this files?
Hi,
I have a question. I´m use ROS Hydro in Ubuntu 12.04. When I try opening some files with Kate, or gedit, for example: /opt/ros/hydro/lib/rviz/rviz or /opt/ros/hydro/lib/hector_mapping/hector_mapping . The code opened is encoded.... | {
"domain": "robotics.stackexchange",
"id": 16997,
"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, mapping, rviz, nodes, hector-mapping",
"url": null
} |
homework-and-exercises, kinematics, acceleration
$u$, $\beta$ and the range OP = $R$ are given in your problem. The acceleration (gravity $g=A$) acts vertically down. We can vary the magnitude $g$ and direction angle $\alpha$ of the acceleration in order to minimise the time of flight $T$.
I suggest that $g=A_{max}... | {
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, kinematics, acceleration",
"url": null
} |
c#, playing-cards
/// <summary>
/// Write player's hand to console.
/// </summary>
public void WriteHand()
{
// Write Bet, Chip, Win, Amount with color, and write Round #
Console.Write("Bet: ");
Console.ForegroundColor = ConsoleColor.Magenta;
... | {
"domain": "codereview.stackexchange",
"id": 43543,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, playing-cards",
"url": null
} |
navigation, mapping, turtlebot2, turtlebot, position
You need to elaborate your question further, because the problem can have various level of complexity.
Regarding the update,
Each of the turtlebot will publish its own positions on the odometry topic (/odom, if I am not wrong). But these positions will be correspond... | {
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"tags": "navigation, mapping, turtlebot2, turtlebot, position",
"url": null
} |
quantum-gate
\end{equation}
Here is a video lecture (starting from 4:19) about a similar example (with another gate) for the interference.
One of the applications of the interference in QC can be found in the Deutch algorithm. The main concept is that in the algorithm depending on the property of the Oracle (a functio... | {
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"tags": "quantum-gate",
"url": null
} |
• This looks like you copied a problem out of a problem list or a book… Do you have any thoughts on the matter? Have you tried anything? – Mariano Suárez-Álvarez Jan 31 '18 at 21:39
• @MarianoSuárez-Álvarez: unfortunately, it is not copied .... the zero set of the ideal corresponds to the set of 2x2 complex matrices wh... | {
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"lm_q1_score": 0.9683812318188365,
"lm_q1q2_score": 0.8306465323647365,
"lm_q2_score": 0.8577681031721325,
"openwebmath_perplexity": 198.81441916949754,
"openwebmath_score": 0.9750661849975586,
"ta... |
java
private void outputMax(final List<Person> friends, final PrintWriter out) {
friends.stream()
.map(Person::getTaxiNumberCount)
.max(Integer::compare)
.map(maxTaxiCount ->
friends.stream()
.filter(p -> p.... | {
"domain": "codereview.stackexchange",
"id": 20934,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java",
"url": null
} |
ros, forward-kinematics
Original comments
Comment by lucasw on 2016-10-28:
When you say 'calculates base to tip transform', are you doing that manually or using tf lookupTransform(base, tip,...) to do it in one call?
Comment by Robot_Cpak on 2016-10-28:
I'm using lookupTransform. Added that to the above. Thanks!
Comme... | {
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"openwebmath_score": null,
"tags": "ros, forward-kinematics",
"url": null
} |
pressure, air, flow
You cannot deliver a fixed flow rate and a fixed static pressure: when the flow rate is kept constant, like produced by volumetric pumps, the pressure will vary with resistance: if you block the exit the pressure will rise until something breaks (often the pump itself).
If you keep the pressure con... | {
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"id": 54570,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "pressure, air, flow",
"url": null
} |
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