text stringlengths 1 1.11k | source dict |
|---|---|
the effective interest rate in decimal form so I = i * 100. m is the compounding times per period. The effective interest rate is the usage rate that a borrower actually pays on a loan.It can also be considered the market rate of interest or the yield to maturity.This rate may vary from the rate stated on the loan docu... | {
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"lm_q2_score": 0.828938806208442,
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"openwebmath_score": 0.543770968914032,
"tags": nul... |
statistical-mechanics, ideal-gas
This new, enlarged vessel will mimic exactly the behaviour of the sticky walled one, at least for particles with normal velocity $v_i$.
The sticky box has volume $L^3$; the enhanced box has volume $L^2\times (L+{(v_1 \times \tau)/}{2})$
Can you see how the distribution of particles ... | {
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"url": null
} |
ros-jade, ros-hydro, ros-industrial, ros-indigo
Building from source requires a catkin workspace and some additional work to make sure all required dependencies are installed. Note that this would only build the ROS-Industrial packages from source, not ROS itself. Some packages have instructions that show how to do th... | {
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"tags": "ros-jade, ros-hydro, ros-industrial, ros-indigo",
"url": null
} |
c++, performance, game, windows, curses
/////////////////////////////////////////// Insert ////////////////////////
/////////////////// Map
void Insert(Map& map, int y1, int y2) {for ( int mc = y1, nm= 0; mc< map.size() && mc< y2; mc++, nm++){
... | {
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"tags": "c++, performance, game, windows, curses",
"url": null
} |
ros, openni, camera
Title: Track human orientation?
Hello,
My question is quite simple. I want to know if there is a ROS package out there that is compatible with ROS Indigo on Ubuntu 14.04 that (preferably) uses point-cloud to detect "human orientation", i.e whether a human is sitting, standing, etc.
Thank you
Orig... | {
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"url": null
} |
Raw Material (Corn, Cassava, Potato, Wheat), Application (Food & Beverages, Industrial, and Feed), Form, and Region - Global Forecast to 2025” report has been added to ResearchAndMarkets.com’s offering. | {
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"tags": nu... |
moveit
Originally posted by v4hn with karma: 2950 on 2017-02-26
This answer was ACCEPTED on the original site
Post score: 2
Original comments
Comment by yangtfu on 2017-02-26:
Do you mean the quaternion vector including w should be normalized? I thought the axis vector of xyz should be a normalized vector which repre... | {
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javascript, jquery, html, css, tic-tac-toe
$('#spot7').click(function(){
if(bottomLeftSquare === 0){
if (turn%2 === 0){
$('#X7').fadeIn('fast');
}else{
$('#O7').fadeIn('fast');
};
turn++;
bottomLeftSquare++;
}
}... | {
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"tags": "javascript, jquery, html, css, tic-tac-toe",
"url": null
} |
(iv) Over the algebraic closure A is a finite cyclic subgroup of D,
so its normalizer even in SL_2(F) is <D,w> which contains D with
index 2, and conjugation by w inverts D.
(v) [Again see Suzuki because in this case |G| is a multiple of p.]
We now enumerate G in two different ways (double-counting is useful
not just... | {
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"openwebmath_score": 0.8611697554588318,
"tags": n... |
a new term, $\delta$, which essentially serves to represent all of the partial derivative terms that we would need to reuse later and we progress, layer by layer, backwards through the network. 303 Linear Partial Differential Equations Matthew J. the process for solving this is usually to analytically evaluate the parti... | {
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"lm_q1_score": 0.9854964198826467,
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"lm_q2_score": 0.8354835432479661,
"openwebmath_perplexity": 675.6615702212589,
"openwebmath_score": 0.7235504984855652,
"tags": null,
... |
c++, c++11, morse-code
{'?', "..--.."},
{'-', "-...-"},
{'/', "-..-."},
{'@', ".--.-."},
{'+', ".-.-."},
{'=', "-..."},
{'\'', ".----"},
{'(', "-.--"},
{')', "-.--."},
{'\"', ".-..-"},
{'\x04', "...-.-"}, //EOT = SK
}; | {
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"tags": "c++, c++11, morse-code",
"url": null
} |
html, web-scraping, xpath, xslt
"name": "Jennifer L Yokoyama",
"meta": []
},
{
"address": "Wilson Sonsini Goodrich & Rosati\n650 Page Mill Road\nPalo Alto, CA 94304-1050\n650-493-9300\nFax: 16504936811\nEmail: jholloway@wsgr.com",
"name": "Julie M... | {
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"tags": "html, web-scraping, xpath, xslt",
"url": null
} |
ros, include, ubuntu, ubuntu-precise, ros-groovy
####
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check ... | {
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evolution
Let's assume that fitness effect at different loci are multiplicative (no epistasis). As a consequence an individual carrying $n$ deleterious mutations has a fitness of
$$\prod_{i=1}^n 1-s_i $$.
Let's further assume that all mutations have the same deleterious effect on fitness, that is $s_1=s_2=...=s_n=s$. ... | {
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ros, slam, navigation, rosdep, qt4
[rosbuild] Building package rgbdslam
Failed to invoke /opt/ros/fuerte/bin/rospack deps-manifests rgbdslam
[rospack] Error: package/stack rgbdslam depends on non-existent package eigen
CMake Error at /opt/ros/fuerte/share/ros/core/rosbuild/public.cmake:129 (message):
... | {
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"tags": "ros, slam, navigation, rosdep, qt4",
"url": null
} |
performance, datetime, random, go
func main() {
rand.Seed(time.Now().UnixNano())
d := time.Duration(rand.Int63n(int64(threeYears)))
fmt.Println(time.Now().Add(-d))
} | {
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"openwebmath_score": null,
"tags": "performance, datetime, random, go",
"url": null
} |
boolean-functions, boolean-formulas, decision-trees
Thus, the function becomes constant on each branch after at most $l$ iterations of this process. | {
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"tags": "boolean-functions, boolean-formulas, decision-trees",
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ros, opencv, ros-kinetic, cv-bridge, image
As you can see, it appears that the received image data has some of the first few pixels' alpha channel value set to 0.
Originally posted by rwong on ROS Answers with karma: 13 on 2018-10-15
Post score: 0 | {
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"tags": "ros, opencv, ros-kinetic, cv-bridge, image",
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} |
php, mysql, mysqli
Title: Universal query preparation function I've finally finished my universal query preparation function. Any suggestions on making it better? I feel it could use some tweaking, but am not sure how I would go about it.
Variable examples/explanation
$db - The database connection
$query - Example: $... | {
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homework-and-exercises, newtonian-mechanics, energy, power
Part 3: the scoops.
Treat each scopp approx. as a point mass, so each contributes:
$$I_3=\frac{mr^2}{2},$$
with $r$ the distance of a scoop from the centre of the wheel and $m$ the mass of a scoop.
Part 4: the central axle.
Assuming it's a hollow cylinder:
$$I... | {
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c#, programming-challenge, linq
Consistency
string text
string answer
Don't you like var for strings because you already use for the other two variables? ;-)
Magic numbers
Enumerable.Range(97, 26)
This would be easier to understand if you used constants:
const string alphabetLength = z - a + 1;
Enumerable.Range('a... | {
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java, queue
/**
* {@inheritDoc}
* @return value of {@code priority} attribute
*/
@Override
public int priority() {
return priority;
}
/**
* {@inheritDoc}
* @return value of {@code Sector} attribute
*/
@Override
public Sector Sector() {
return Sector;
}
/**
* {@inheritDoc}... | {
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• A matrix like $A$ of rank two has not necessary a zero row, so you must perform some elementary transforms in order to get there. I wonder now if these elementary transforms don't interfere with the ones used for $B$ in a wrong way, that is, you have multiply $PAQ$ by $RBS$ with $Q\ne R^{-1}$. – user26857 May 7 '15 a... | {
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"openwebmath_score": 0.9775821566581726,
"ta... |
ros2, moveit, ros-kinetic
Title: Failed to load planning library in MOVEIT motion planning
We are doing project on igus robot arm. We have developed URDF package from SW2URDF extension. After that we are trying to integrate it in moveit setup assistant and generated package for moveit_config.
But, we are facing some ... | {
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9. Allen says:
As a note to the last argument, it sounds like I say that any sequence starting with {3, 6, …, 3n + 3} has to be longer than its neighbours, this isn’t true, but my argument was that they will have a tendancy of being a longer sequence because the set of sequences beginning with {3, 6, …, 3n + 3} must g... | {
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"lm_q2_score": 0.8128673110375458,
"openwebmath_perplexity": 560.8807959677262,
"openwebmath_score": 0.7346580028533936,
"... |
neurophysiology, neurodegenerative-disorders
Title: What is it that specifically kills ALS patients? ALS is a fatal motor neuron disease, and even though there are many different articles out there on the topic "How does ALS actually kill you?", none of them really delve deep enough into biology to adequately answer t... | {
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"tags": "neurophysiology, neurodegenerative-disorders",
"url": null
} |
python, clustering, recommender-system, ranking, matrix
Cluster similar customers based on their profiles and their preferences for certain devices
Cluster similar devices based on ratings but also device attributes
Create a recommender system based on clusterings 1 and 2
Here is how I would do it:
Cluster customers... | {
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"tags": "python, clustering, recommender-system, ranking, matrix",
"url": null
} |
electromagnetism, energy-conservation, electromagnetic-induction
Title: Why Lenz's law works? When we move a magnet towards a coil, current is induced in it. Magnetic field too develops around it. Since there is interaction of both magnetic fields(that of magnet and coil), there is magnetic potential energy in field(g... | {
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"tags": "electromagnetism, energy-conservation, electromagnetic-induction",
"url": null
} |
kinect
Originally posted by Amin on ROS Answers with karma: 93 on 2012-04-24
Post score: 1
Hi Again,
After some tests, I realized that even using the trick above you are not able to get more than -60 degrees on tilting kinect. In other words, kinect is able to tilt down -30 degrees itself (according to kinecy_aux sta... | {
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ros
Title: Why do vectors not work in ROS?
H everyone, I can compile the following code in Xcode but I cannot do the same when using rosmake. Here is my .h file:
#ifndef __AStartAlgorithm__AStarAlgorithm__
#define __AStartAlgorithm__AStarAlgorithm__
#include <iostream>
#include <vector>
class AStarAlgorithm{
pu... | {
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________ since it has four right angles, and a since it has four congruent sides. 5) Theorem 6.2C states: If both pairs of opposite _____ of a quadrilateral are congruent, then the quadrilateral is a parallelogram. To explore these rules governing the sides of a parallelogram use Math Warehouse's interactive parallelog... | {
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"lm_q1_score": 0.9925393556533171,
"lm_q1q2_score": 0.8271074507183028,
"lm_q2_score": 0.8333245891029456,
"openwebmath_perplexity": 680.622843572116,
"openwebmath_score": 0.8541576862335205,
"tags... |
Integração númerica Newton-Cotes. Hairer and M. We begin by clicking on file on the Matlab Command Window and new. Book Description. time) and one or more derivatives with respect to that independent variable. This course will focus on the root finding and numerical integration techniques most frequently covered at the... | {
"domain": "gremium-franconia.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713826904225,
"lm_q1q2_score": 0.852480536737994,
"lm_q2_score": 0.865224091265267,
"openwebmath_perplexity": 977.7125887879093,
"openwebmath_score": 0.5875372886657715,
... |
javascript, react.js
}
handleClick() {
document.body.classList.toggle('dark');
if(document.getElementById('switch-style').checked === true){
window.localStorage.setItem('theme', 'dark');
}
else if (document.getElementById('switch-style').checked === false){
window.localStorage.setItem(... | {
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"openwebmath_score": null,
"tags": "javascript, react.js",
"url": null
} |
ros, gazebo, roslaunch, world
to start the gas station world then do:
roslaunch lawnbot_gazebo lawnbot.launch -bot_test_world
I am not trying to run multiple worlds at once. I just want to choose the world to start from the terminal instead of modifying the launch file every time I want to change the world.
Here is ... | {
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"tags": "ros, gazebo, roslaunch, world",
"url": null
} |
homework-and-exercises, special-relativity, spacetime, inertial-frames, time-dilation
My confusion is with part 2 of the question. It asks for the change in time between the clock in the ship and the clock of the observer.
The book solves the problem like this,
The ground observers watch a single clock ticking off ev... | {
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Problem: Magic Numbers
Write a program that enters a single integer magic number and produces all possible 6-digit numbers for which the product of their digits is equal to the magical number.
Example: "Magic number" → 2
• 111112 → 1 * 1 * 1 * 1 * 1 * 2 = 2
• 111121 → 1 * 1 * 1 * 1 * 2 * 1 = 2
• 111211 → 1 * 1 * 1 *... | {
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"openwebmath_score": 0.43166854977607727,
"tags": ... |
javascript, html, datetime, form, finance
Rather than testing isNaN(date.getTime()) second, test it first, and remove it from the if-else block.
Then, you can simply return the boolean value of
Object.prototype.toString.call(date) !== "[object Date]"
into:
function isValidDate(date) {
"use strict";
if (isNaN(... | {
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One possibility is that HFTs reacted to a large sell order of futures. This order was being implemented by an algorithm and was to sell the futures without regard for price or timing1 – this resulted in the futures being dumped far more quickly than expected. The HFTs then also started selling these futures, driving th... | {
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"lm_q1q2_score": 0.8064129350055449,
"lm_q2_score": 0.8152324871074607,
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"openwebmath_score": 0.5641108155250549,
"tags": n... |
Finally the $x$ in
$$1+x+x^2+\cdots$$
counts spaces between $n$ and $y_5$.
The coefficient of $x^{n-5}$ is the number of choices with $n-5$ spaces (unchosen numbers) because
$$\text{#}(\text{chosen numbers from n})+\text{#}(\text{unchosen numbers from n})=n$$ $$\implies 5+\text{#}(\text{unchosen numbers from n})=n$... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513914124559,
"lm_q1q2_score": 0.8062522050899941,
"lm_q2_score": 0.8175744739711883,
"openwebmath_perplexity": 373.69182192226225,
"openwebmath_score": 0.8682951927185059,
"ta... |
classical-mechanics, fluid-dynamics, water, pressure
Title: How come a whistling kettle starts whistling only when water boils, and not long before - due to hot air escaping under pressure? A whistling kettle will start to whistle when the water boils and turns into a jet of steam which then exits the small aperture i... | {
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"tags": "classical-mechanics, fluid-dynamics, water, pressure",
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} |
fft, dft, bandwidth, music, zero-padding
this indicate that if we had a higher sampling rate than 44.1kHz, we would have seen higher frequency components of the music? In other words, the FFT looks like higher frequency components got "cut off" by a low sampling rate. | {
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inorganic-chemistry, molecular-structure
Note the following: If you have two bonds from a central atom which are each described by a bonding and an antibonding orbital, then these two sets of orbitals will always be orthogonal to each other (the integral of overlap is $0$). Thus they will be indifferent to each other,... | {
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"url": null
} |
ros-fuerte, roscore
return self.__send(self.__name, args)
File "/usr/lib/python2.7/xmlrpclib.py", line 1575, in __request
verbose=self.__verbose
File "/usr/lib/python2.7/xmlrpclib.py", line 1264, in request
return self.single_request(host, handler, request_body, verbose)
File "/usr/lib/python2.7/xmlrpcli... | {
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"url": null
} |
organic-chemistry, spectroscopy, molecular-structure, spectrophotometry, dye
Title: Looking for a dye which emits around 680 nm For a specific experiment, I'm looking for a dye which would emit around 680 nm. Preferably one I could buy easily commercially. Are there any databases which might give the emission spectra ... | {
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... |
python, beginner
You should also have an else printing an error message in case the user enters something invalid. Like so:
if userInput.lower() == "q":
# ...
elif userInput.lower() == "e":
# ...
elif userInput.lower() == "d":
# ...
elif userInput.lower() == "c":
# ...
elif userInput.lower() == "b":
... | {
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"tags": "python, beginner",
"url": null
} |
frequency, octave
Title: Frequency Response Error for IIR Butterworth in GNU Octave I'm wondering why the following code for GNU Octave appears to be incorrect in the frequency domain by a magnitude of 2. For example, in Figure 1. (Sorry, I'm apparently not allowed to post images!) it can be seen that the -3dB points ... | {
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"tags": "frequency, octave",
"url": null
} |
celestial-mechanics
Consider Voyager 2, which toured the Jovian planets. The spacecraft was launched on a Type-II Hohmann transfer orbit to Jupiter. Had Jupiter not been there at the time of the spacecraft's arrival, the spacecraft would have fallen back toward the sun, and would have remained in elliptical orbit as l... | {
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"openwebmath_score": null,
"tags": "celestial-mechanics",
"url": null
} |
fl.formal-languages, cr.crypto-security, grammars, security
Title: Contract preservation using grammars I am exploring using annotated grammars to formalize and enforce parts of contracts between nodes in a distributed application.
I've found a number of articles on languages for specifying fairly general types of con... | {
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"tags": "fl.formal-languages, cr.crypto-security, grammars, security",
"url": null
} |
asymptotics, master-theorem
Title: Master theorem recurrence relation Consider I have the following recurrence
$$T(n) = 10T(n/3) + \Theta(n^2\log^5 n)\,.$$
Now, by the master theorem, if we evaluate $n^{\log_{b}{a}}$, we get $n^{\log_{b}{a}} = n^{\log_{3}{10}} = n^{2.095}$. Now, can anyone please explain me, which of ... | {
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"tags": "asymptotics, master-theorem",
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#### mathmari
##### Well-known member
MHB Site Helper
Shouldn't it be $P(X\geq k)=10.18\% \Rightarrow 1-P(X{\color{red}<} k)=10.18\%$ ?
Can't we calculate those terms until we get to the percentage?
Alternatively we can use some tool or table to calculate the inverse cumulative binomial function.
So we have the foll... | {
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"tags... |
algorithm, array, vba
Output:
6,16,18 in string 1 were deleted.
6,7,18 in string 2 were inserted. Nothing much to complain about with this code, so here's a short list of opportunities that may or may not fall under the realm of personal preference:
Dual-branch conditional assignments like this, where there's only a... | {
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"openwebmath_score": null,
"tags": "algorithm, array, vba",
"url": null
} |
visible-light, heisenberg-uncertainty-principle
Title: Is Heisenberg's Uncertainty Principle applicable to light? Can we apply the Uncertainty Principle to light? If so wouldn't it violate it because we just need to find the position of light, since we would already determine it's momentum(from the wavelength of light... | {
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"tags": "visible-light, heisenberg-uncertainty-principle",
"url": null
} |
newtonian-mechanics, harmonic-oscillator, oscillators, approximations, anharmonic-oscillators
Substituting $(3)$ in $(2)$, you get,
$$L\frac{d^2\theta}{dt^2} = -g \sin \theta \tag{4}$$
If you compare equation $(4)$ with equation $(1)$, you'll notice that it does not match.
This would mean that the pendulum bob does n... | {
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"tags": "newtonian-mechanics, harmonic-oscillator, oscillators, approximations, anharmonic-... |
machine-learning, python, classification, scikit-learn, multilabel-classification
I am trying to know both the sex and the weigh based on the value of the features A,B,C,D. I learned that this a multi-label classification problem and there is a nice python library that should help (e.g. scikit-multilearn ). However I ... | {
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"tags": "machine-learning, python, classification, scikit-learn, multilabel-classificati... |
food, digestive-system, digestion, gastroenterology, stomach
Or does the stomach eventually get fed up with all the new introductions and just start releasing whatever it has into the small intestine, ready or not? In that case, when and how did it decide to proceed with incomplete processing? First of all, the stoma... | {
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"tags": "food, digestive-system, digestion, gastroenterology, stomach",
"url": null
} |
symmetry, potential, capacitance
$$\Phi(r,\theta)=R(r)\Theta(\theta)=R(r)$$
is independent of $\theta$ for all values of $r$. This is the desired result.
In addition, in this case, $\frac{d\Theta(\theta)}{d\theta}=0$, from Eq. (5), we find $\lambda=0$, and therefore by using Eq. (4), we have
$$\frac{d}{{dr}}\left( {{r... | {
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c++, c++11, library, audio
It's hard to reason about threads you no longer have any control over. I would just trust the operating system, it already performs caching for you, and will likely read ahead for you as well.
Avoid using a std::set for channels
A std::set is quite an expensive data structure to use to pass ... | {
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"tags": "c++, c++11, library, audio",
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= 15 (bottom right) and maxlag = 3 (bottom left) . “Note that values of k up to 5 are significant and those higher than 5 are not significant.” The results are shown in Figure 2. Dan, Charles, Dear Charles Yes, you are correct. in this workbook i provided the bounds of ACF and PACF significance just like Shazam, EViews... | {
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"lm_q1_score": 0.9693242036063215,
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"openwebmath_score": 0.786353588104248,
"tags"... |
sql, sql-server, t-sql, stackexchange
I am looking for any feedback, especially whether there's a better way to accomplish the basic task of assigning classifiers to each badge, and to tag badges. Of course, general style, performance, and consistency reviews are welcome.
Style Points
Okay, first things first. you pr... | {
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"tags": "sql, sql-server, t-sql, stackexchange",
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} |
reinforcement-learning, rewards, reward-design
Title: How do I design the rewards and penalties for an agent whose goal it is to explore a map I am trying to train an agent to explore an unknown two-dimensional map while avoiding circular obstacles (with varying radii). The agent has control over its steering angle an... | {
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"tags": "reinforcement-learning, rewards, reward-design",
"url": null
} |
secant and tangent line sliders. The integral calculator software provides tools to solve the integrals step by step and hence helps the students of mathematics to understand the same. Set up but do not evaluate the triple integral that gives the volume. Triple graph grammars, an extension of pair graph grammars, were.... | {
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"openwebmath_score": 0.8046685457229614,
"... |
performance, vba, excel
Title: Find differences between two spreadsheets I have this code that is supposed to compare two Excel sheets. The code is working fine for small comparisons. I did a test run with 7 rows and 2 columns.
The code itself works as follows: it compares the two sheets and copies the differences int... | {
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"tags": "performance, vba, excel",
"url": null
} |
waves, fourier-transform, wavelength, signal-processing
Title: Does a square (or any non-sinusoidal) wave a definite wavelength? I'm currently reading/studying the FLP and I have a question regarding waves. In a chapter about QM, Feynman says that any short wave train doesn't have a definite wavelength. I understand t... | {
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"tags": "waves, fourier-transform, wavelength, signal-processing",
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c#, combinatorics, knapsack-problem
for (int i = iBegin; i <= iEnd; i++)
{
subSetIndexes[k - 1] = i;
++iBegin;
CombinationsNoRepetition(k - 1, iBegin, iEnd);
}
}
}
}
Input:
-
Output:
Initial Set.
{2 ,3 ,1 ,-1}
Wanted sum ... | {
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Only the second of these actually accepts the string (which, by my description, we'd really like to accept). So, computation by a machine like this is non-deterministic, i.e. we can't tell exactly what the computation will be for every input. Still, can we come up with a sensible definition of what strings such a machi... | {
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"lm_q1q2_score": 0.8127840974353908,
"lm_q2_score": 0.8354835452961425,
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"openwebmath_score": 0.7461524605751038,
"tags": null,... |
(n-1)^(n-1)/(n^n) vs (n!)/(n^n)
Where n = 6:
1/6 * 5/6 * 5/6 * 5/6 ... vs 6/6 * 5/6 * 4/6 * 3/6 ...
Where n = 8:
1/8 * 7/8 * 6/8 * 5/8 ... vs 8/8 * 7/8 * 6/8 * 5/8 ...
Since every "Diverse set" includes one "six", any set with one "6" that isn't a "Diverse set" increases odds of just one six, rather than getting a... | {
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"lm_q1q2_score": 0.827142117568131,
"lm_q2_score": 0.8418256512199032,
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"openwebmath_score": 0.8120077252388,
"tags": ... |
topological orders for this DAG: 1,2,5,4,3,6,7 2,5,1,4,7,3,6. ( DAGs ) - Graphs that have edges indicating direction the article: http: video. A topological ordering, and buildings absolutely correct sorting on a graph results non-unique...., produce a topological ordering, and permutations with prescribed up-down sequ... | {
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"lm_q1_score": 0.9643214491222696,
"lm_q1q2_score": 0.8614374230151711,
"lm_q2_score": 0.8933094081846421,
"openwebmath_perplexity": 1161.597526904899,
"openwebmath_score": 0.5246270895004272,
"tags": nu... |
energy, heat, renewable-energy
To get an idea of the calculation for this last point, note that we can measure the climate for going back 80,000 years by looking at the temperatures in the Ural superdeep borehole which goes down 12km. When digging such a hole, the temperatures at the top of the hole is the current tem... | {
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c#, design-patterns, object-oriented, generics, .net-2.0
book.BookID = 101;
book.Author = "First Author";
book.BookTitle = "Book 1";
}
return book;
}
}
} That is a very good start. However, look into moving the loop to get all the books into the GetA... | {
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quantum-mechanics, hilbert-space, wavefunction, density-operator, normalization
Is it simply that we assume that quantum states are normalized and the magnitude of $|\psi\rangle$ is 1 in any case? Pure states are defined as rays of vectors, although different books choose to give different sorts of emphasis on this. N... | {
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... |
java, object-oriented, json, serialization
The default deserialization behavior is to match up enum constant names, i.e. BASIC string would match with AuthType#BASIC automatically. I'm using Jackson for deserialization.
Every time I get an enum that implements SelectOption in a serialized form (as a String), I get it ... | {
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performance, c, generics, fixed-point
Title: Fixed Point Number to String I recently learned about using fixed point arithmetic on embedded systems without floating point hardware, so I decided to code it. I tried to write in good style, but emphasized speed over style.
One hard problem I encountered was to convert th... | {
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• "The way you specify the conditional joint distribution, Z does not necessarily have any dependence on X or Y. Am I correct in saying this?" No, $Z$ is dependent on $X$ and $Y$. \begin{align*}P\{X=0,Y=1,Z=1\}&=P\{X=0,Y=1\mid Z=1\}P\{Z=1\}\\&=\frac{1}{2}\times\frac{1}{2} = \frac{1}{4} \neq P\{X=0\}P\{Y=1\}P\{Z=1\}=\fr... | {
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When finding the area bounded by the two curves, make sure you're always integrating top minus bottom. In this case, the $-3x^2$ is actually greater than $x^2 - 4x$. Thus, your integral should be: $$\int_0^1-3x^2-\left(x^2 - 4x\right)\;dx$$ That was the only error you made.
-
I see thanks for the help. – Fernando Mart... | {
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"openwebmath_score": 0.8232869505882263,
"tags... |
np-complete, satisfiability, np
Assume that you are given an instance of 3-SAT. The goal is to convert it in polynomial time into an instance of 4-SAT in such a way that the answer is preserved.
Take each clause $(x \lor y \lor z)$ and turn it into $(x \lor y \lor z \lor a) \land (x \lor y \lor z \lor \neg a)$, where ... | {
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"openwebmath_score": null,
"tags": "np-complete, satisfiability, np",
"url": null
} |
photons, atoms
An electron bound to a nucleus forms an atom , and usually occupies the ground energy level. If a photon with the appropriate energy hits the atom and it has an energy covering the energy levels of the atom, the system goes to a higher excited energy level. The electron is located at a higher energy le... | {
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"openwebmath_score": null,
"tags": "photons, atoms",
"url": null
} |
homework-and-exercises, newtonian-gravity, symmetry, gauss-law
Title: Why Gauss's law for gravity can be applied to this problem?
Consider a spherical and homogeneous celestial body with mass $ M $ and radius $ R $ crossed from pole to pole by a straight cylindrical tunnel of negligible diameter. At one of these pole... | {
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"tags": "homework-and-exercises, newtonian-gravity, symmetry, gauss-law",
"url": null
} |
quantum-mechanics, electromagnetism, electromagnetic-radiation
The two beams are now aligned, but their polarizations are not the same.
If the two beams come from a single laser, or if they come from two phase-locked lasers, the combined beams will add up to a single beam with elliptical polarization. By very slightl... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, electromagnetism, electromagnetic-radiation",
"url": null
} |
orbital-motion
Title: While launching something directly into the sun costs a lot of energy, couldn't we just launch it opposite earths orbit? So, according to this question, it's pretty hard to launch something into the sun directly, it takes a lot of energy to cancel out earths orbital speed.
That being said, I'm no... | {
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"id": 36158,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "orbital-motion",
"url": null
} |
control, ros, rate
Title: An outer loop with a slower ros::Rate() and an inner loop with a faster ros::Rate() logic
Consider the situation where there is an outer control loop and an inner control loop. The outer loop runs at 100Hz and the inner loop runs at 500Hz. The inner loop will run 5 times before the outer lo... | {
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"id": 23025,
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"tags": "control, ros, rate",
"url": null
} |
string-theory, supersymmetry, quantum-chromodynamics, yang-mills, superconformality
The fermionic matter fields also carry a spinor index $\alpha=1,2$ for obvious reasons: fermions are spacetime spinors.
The remaining index carried by scalars $q$ as well as fermions $\psi$ is the capitalized index $A,B=1,\dots 2N_f$ l... | {
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"tags": "string-theory, supersymmetry, quantum-chromodynamics, yang-mills, superconformality... |
c++
seems like it should use cerr.
Returning strings
Currently, something like cubestring:
Is constructed once, with an empty value, in parse_args string cubestring;
Is constructed a second time with an actual value, in args.emplace_back
Is copy-constructed a third time, on var = args[argindex];
This is not great. I... | {
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"tags": "c++",
"url": null
} |
quantum-mechanics, atomic-physics, group-theory, wigner-eckart
Varshalovich, Dmitriĭ Aleksandrovich, Anatolï Nikolaevitch Moskalev, and Valerii Kel'manovich Khersonskii. Quantum theory of angular momentum. 1988.
Either way, once these operations are done (they will involve permuting indices in the CGs ) one finally ... | {
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"tags": "quantum-mechanics, atomic-physics, group-theory, wigner-eckart",
"url": null
} |
fluid-dynamics, flow, porous-media
What is the explanation/math/assumptions made, when using Eqns. 2 and 3, to justify the proposed plotting method to determine the absolute permeability from non-darcy data? I.e., how was the plotting method developed? All credit goes to Dr. Thomas A. Blasingame. This derivation is f... | {
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"id": 18877,
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"tags": "fluid-dynamics, flow, porous-media",
"url": null
} |
algorithms, computational-geometry, clustering, streaming-algorithm
Title: Testing of Clustering of points in metric space in sub-linear time I am trying to understand this paper, in which (k, b)-clusterability is defined like so:
A set $X$ of points in a metric space is (k, b)-diameter clusterable if $X$ can be part... | {
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"openwebmath_score": null,
"tags": "algorithms, computational-geometry, clustering, streaming-algorithm",
"url": null
} |
optics, visible-light, experimental-physics, lenses
Suppose you have your lens in the middle of the setup and you were to have on one side a projector and on the other side a screen. The object coming out from the projector would then go through the lens and be flipped, afterwards it would travel till it reaches your ... | {
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"tags": "optics, visible-light, experimental-physics, lenses",
"url": null
} |
algorithm, sorting, go, mergesort
As a result, your code is very inefficient. Your code is off-by-one.
The Go Programming Language
Specification
Appending to and copying
slices
The variadic function append appends zero or more values x to s of
type S, which must be a slice type, and returns the resulting slice,... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithm, sorting, go, mergesort",
"url": null
} |
ant, learning
Title: Can ants learn things? I have an ant nest in a jar. Whenever I want to observe them, I have to remove the cover and therefore put them in light - that scares them. They also can see shadow cast by myself.
I often throw in some food when I'm uncovering the jar.
I was curious if ants will ever remem... | {
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"id": 10193,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ant, learning",
"url": null
} |
finite-impulse-response, interpolation
Regards,
Pradeep M C I did not review your entire code, but from your description I believe what you are seeing is expected and explained with the following graphic.
The upper portion shows an example digital spectrum in the unique frequency span of DC to $F_s$ where $F_s$ is the... | {
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"tags": "finite-impulse-response, interpolation",
"url": null
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organic-chemistry, solubility, polarity
Title: Salicylic acid - polarity and solubility Really confused about this, since there is carbon and two other types of atoms: should be polar, right? However, some people online say it is non-polar. Also, is it soluble in water? Well it has polar groups - carboxylic and phenol... | {
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"id": 2897,
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"tags": "organic-chemistry, solubility, polarity",
"url": null
} |
meteorology, clouds, precipitation, mountains, geobiology
Once the air crosses to the other side of the mountain range it warms and becomes undersaturated with water. Clouds often disappear and even if they remain you aren't getting further condensation to produce a lot of rain. So those areas are much drier. | {
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"id": 616,
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"tags": "meteorology, clouds, precipitation, mountains, geobiology",
"url": null
} |
java, beginner, array, game-of-life
// decides what will happen to cell
for (int row = 0; row < rowsNum; row++) {
for (int col = 0; col < colsNum; col++) {
int numOfNeighbours = countCellNeighbours(curGen, rowsNum, colsNum, row, col);
// under or overpopulation, cell dies
... | {
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"openwebmath_score": null,
"tags": "java, beginner, array, game-of-life",
"url": null
} |
java, algorithm, programming-challenge
if((int)message.charAt(n-k)==0)
The characters in the input are in the range of '0'..'9',
therefore their int values are in the range of 48..57.
Unnecessary Integer[]
You could safely replace Integer[] with int[],
and use a condition on zero value instead of null value. | {
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cosmology, energy-conservation, universe, space-expansion, cosmic-microwave-background
With a CMB temperature of $T_0 = 2.718\mathrm{K}$ (Planck Collaboration et al. 2016), the average energy of a CMB photon is $E_\mathrm{ph,now} = k_\mathrm{B}T_0 = 2.3\times10^{-4}\,\mathrm{eV}$. Since they're seen redshifted by $z\s... | {
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"id": 61845,
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"tags": "cosmology, energy-conservation, universe, space-expansion, cosmic-microwave-backgr... |
fluid-dynamics
For a given rotational speed, there is a single steady-state characteristic relating pressure ratio and massflow rate. The shape of this curve can vary (e.g. compare the 40% Nf line with the 100% Nf line above), but generally speaking the higher the pressure ratio, the lower the massflow rate for a give... | {
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"id": 14961,
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"tags": "fluid-dynamics",
"url": null
} |
c++, game, c++17
constexpr double deg_255 = deg_240 + deg_15;
constexpr double deg_270 = 3 * deg_90;
constexpr double deg_285 = deg_270 + deg_15;
constexpr double deg_300 = deg_285 + deg_15;
constexpr double deg_315 = deg_270 + deg_45;
constexpr double deg_330 = deg_315 + deg_15;
constexpr doub... | {
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"tags": "c++, game, c++17",
"url": null
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# Is the curve $\left[ \cos \left( t^2 \right), \sin t \right]$ a square?
I found this marvellous thing while playing around in Desmos!
It seems to me that the curve $$\vec{r}(t) = \left[ \cos ( t^2 ), \sin t \right] \left( t \in [0, +\infty) \right)$$ is filling a square. But, as @BarryCipra kindly pointed out, it c... | {
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"lm_q2_score": 0.8577681049901037,
"openwebmath_perplexity": 129.5268835835982,
"openwebmath_score": 0.8297243714332581,
"tags"... |
get the formula just use arguments. Previous element to get the formula, it is easy to generate the row... Can it be further optimized using this way or another algorithm to use only O ( )... Is a very famous problems in C language InterviewBit ’ s triangle written with Combinatorial Notation following are the eight. A... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9805806546550656,
"lm_q1q2_score": 0.8016977216331255,
"lm_q2_score": 0.8175744828610095,
"openwebmath_perplexity": 737.2924914774785,
"openwebmath_score": 0.6564574837684631,
"tags"... |
quantum-field-theory, research-level, quantization, yang-mills
Let $\Gamma[v]$ be the effective action (Legendre transform of the connected generating function $W[J]$) where $v=v(J)=\frac{\delta W[J]}{\delta J}$ is the "classical" field generated by the sources $J$. If we modify the classical action by splitting the q... | {
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"openwebmath_score": null,
"tags": "quantum-field-theory, research-level, quantization, yang-mills",
"url": null
} |
ros, gazebo, rviz, moveit, collision
Originally posted by IgnacioUD on ROS Answers with karma: 47 on 2021-03-18
Post score: 0
MoveIt supports dual arm manipulation out of the box, so typically the 2 UR3s are combined into a single URDF (using xacro) and consider one unified robot.
Is there are reason you are running ... | {
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"tags": "ros, gazebo, rviz, moveit, collision",
"url": null
} |
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