text stringlengths 1 1.11k | source dict |
|---|---|
projectile
Title: Finding max range and speed at highest point of trajectory when projected Horizontaly
What is the maximum range of a shell projected across horizontal
ground from a gun with an initial speed of 300 m s-1? What will its
speed be at the highest point of its trajectory? (Ignore air
resistance.) | {
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newtonian-mechanics, conservation-laws, collision, computational-physics, software
see this Wikipedia page.
As pointed out in the comments, you can only generalise this easily to the three-dimensional case if all of your moving objects are spheres. If they are not then collisions become much more complicated, since t... | {
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np-complete, np, decision-problem
Title: NP-Complete Reduction Prove the following problem is NP-Complete:
The problem gave a directed graph G, and several subsets of vertices of such graph are being specified as T1,T2,....Tn, and the subsects could intersect, does there exist a path in G where it doesn't contain any ... | {
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"tags": "np-complete, np, decision-problem",
"url": null
} |
python, beginner, python-3.x, game, adventure-game
def spy():
button = prompt_for_input(supply_attack_espionage, ('X', 'B', 'A'))
load(5)
if button == 'X':
print('\n{}\n\n{}{}\n'.format(espionage_rush, change_relation(('civilian', '---'), ('army', '---'),
... | {
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"tags": "python, beginner, python-3.x, game, adventure-game",
"url": null
} |
java, quiz
answers[i] = answer;
}
//Process
DriverExam exam = new DriverExam(answers);
//Results
System.out.println(" RESULTS ");
//Outputting total correct
System.out.println("Total Correct: " + exam.totalCorrect());
//Outputting total incorrect
System.o... | {
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"tags": "java, quiz",
"url": null
} |
fourier-transform, frequency-spectrum, coherence
\begin{equation*}
\vec{x}_f=(\vec{x} \bullet \vec{w}_0)\vec{w}_0+(\vec{x} \bullet \vec{w}_1)\vec{w}_1
\end{equation*}
(I tested this principle on some simple linear combinations of sinusoids and it worked--please tell me if I'm completely off base here.) The graph of th... | {
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"tags": "fourier-transform, frequency-spectrum, coherence",
"url": null
} |
algorithm, graph, f#
I got the results from another code in Python the solution differs at nodes
[10; 26; 95; 96; 101; 147; 157; 184; 188; 196] only.
I can't figure out if my algo is wrong as I got a 95% good answer. Maybe I've missed some cases, or I have a bug in the I/O part and don't play with the same graph.
the... | {
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"tags": "algorithm, graph, f#",
"url": null
} |
rosinstall
Originally posted by nfaction on ROS Answers with karma: 1 on 2012-04-24
Post score: 0
Please make sure that rosinstall and vcstools are up to date.
sudo pip install -U vcstools rosinstall
Originally posted by tfoote with karma: 58457 on 2012-04-24
This answer was ACCEPTED on the original site
Post score:... | {
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"tags": "rosinstall",
"url": null
} |
electrical-engineering, thermodynamics, chemical-engineering, cooling, electricity
Reference for this: https://www.nrel.gov/docs/fy10osti/47302.pdf
The authors of the paper describe the construction of such a device as well as a test showing that it is indeed capable of reducing temperatures inside a room (the paper i... | {
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"tags": "electrical-engineering, thermodynamics, chemical-engineering, cooling, electric... |
Then $G/N=\{ a\oplus_8N : a\in G\}$. Note $\oplus_8$ is addition modulo 8.
The distinct cosets are
$\mathbb{Z}_8/K=\{ K,1\oplus_8K,2\oplus_8K,3\oplus_8K\}$
The number of distinct cosets is given by $|\mathbb{Z}_8|/|K|$
Note
$K=\{ 0,4\}$
$1\oplus_8K=\{ 1,5\}$
$2\oplus_8K=\{ 2,6\}$
$3\oplus_8K=\{ 3,7\}$
• That d... | {
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"lm_q2_score": 0.8221891370573388,
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"openwebmath_score": 0.9290720820426941,
"tag... |
navigation, rosaria
Originally posted by RafBerkvens on ROS Answers with karma: 386 on 2013-10-18
Post score: 0 | {
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"openwebmath_score": null,
"tags": "navigation, rosaria",
"url": null
} |
np-complete
I've been lately reading about the clique problem, specifically, the variety of the clique problem of deciding whether a given graph $G$ with $n$ nodes has a clique of at least size $k$.
Why is this problem $NP$-complete? Could one solve this problem in polynomial time by trying out each possible group of ... | {
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"tags": "np-complete",
"url": null
} |
php, mysql, pdo, sql-injection
I wanted to recommend some investigation into the possibility of using an autoincremented primary id with two unique columns, https://stackoverflow.com/q/5416548/2943403 but there seems to be some debate about stability and suitable environments. Furthermore, I don't want to make any in... | {
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"tags": "php, mysql, pdo, sql-injection",
"url": null
} |
zoology, hybridization, artificial-selection, feline
such hybrids are not necessarily to be expected, and as I said below, I'm more surprised about how many hybrids are possible. It does appear though that this particular hybrid is prone to dwarfism, which indicates that it probably does not have a particularly viable... | {
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"tags": "zoology, hybridization, artificial-selection, feline",
"url": null
} |
python, python-3.x
while any_more_ps_guests == "yes":
ps_guest_name = input('Pacific Shores Guest Name: ')
ps_arrival_date_input = input("Arrival Date (xx/xx/xxxx): ")
ps_arrival_date_month = int(ps_arrival_date_input[:2])
ps_arrival_date_day = int(ps_arrival_date_input[3:5])
ps_arrival_date_ye... | {
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"tags": "python, python-3.x",
"url": null
} |
organic-chemistry, acid-base, aromatic-compounds, molecular-structure
One measure of steric bulk is the cyclohexane $A$-Value, a table of which can be found here. From the table we see that methoxy $(A=0.6)$ and nitro $(A=1.1)$ groups have a smaller steric size than that of a methyl $(A=1.7)$ group. Methoxy and nitr... | {
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"url": ... |
transforms, ros-kinetic, transform-listener, tf2
You can then use this to lookup transforms further in the past, as long as your bag file contains transforms for that time. I've never tried to see how long you can make this buffer, you could try hours and see what happens.
Hope this helps.
EDIT :
The TransformListener... | {
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"url": null
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python, keras, rnn, lstm
A perhaps more sophisticated way to approach this would be to create datasets on a single-city basis, then train several sub-models on each city individually (say for 5 layers), then Merge/Concatenate them and put several further layers on top. This will mean you are combining the learnt featu... | {
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"tags": "python, keras, rnn, lstm",
"url": null
} |
protons
I was thinking...what would happen if two protons collide?
I am not sure that my question has sense, so my apologies for that.
Thank you in advance. The answer depends on how exactly the protons collide. In many circumstances the results of the collision can be explained in terms of electromagnetic forces and ... | {
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"tags": "protons",
"url": null
} |
ros-kinetic, ros-indigo
Title: [Resolved] Communication between Kinetic and Indigo only working one-way
I am currently trying to set a Master-Slave using my laptop (Ubuntu 16.04 w/ ROS Kinetic) as master and an UDOO Quad (Ubuntu 14.04.5 LTS (GNU/Linux 3.14.56-udooqdl-02044-gddaad11 armv7l) w/ ROS Indigo ARM) as a cli... | {
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"tags": "ros-kinetic, ros-indigo",
"url": null
} |
particle-physics, terminology, standard-model, antimatter, quarks
Quarks differ by their carrying a color - interacting via the strong force (one mediated by gluons and described by QCD). Leptons don't carry any color so they don't interact by the strong force – which is the reason why their name, "leptons", is relate... | {
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"tags": "particle-physics, terminology, standard-model, antimatter, quarks",
"url": null
} |
# Getting all (complex) solutions of a non polynomial equation
Hi !
I was used to solve the following equation with Mathematica. $$\alpha_1 + \alpha_2x + \alpha_3x^2 + x^4 + \frac{\alpha_4}{x^2-\alpha_0} + \frac{\alpha_5 x^2}{x^2-\alpha_0}=0$$ where $\alpha_i$ are constants.
The Mathematica function "Solve" gives me... | {
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electrostatics, electric-fields, potential-energy
I suppose you know that when you have a conservative force $\vec{F}$ acting on an object to move it from an initial point $\vec{x}_i$ to a final point $\vec{x}_f$, the integral $\int_{\vec{x}_i}^{\vec{x}_f}\vec{F}\cdot\mathrm{d}\vec{s}$ depends only on the endpoints $... | {
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"tags": "electrostatics, electric-fields, potential-energy",
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6 12
105-------99--------------87
the ratio will be 12:6 of pen to pencil ratio. i.e., 2:1
but, it was asked for pencil to pen so it is 1:2...
this is one of the best method you can try for all mixture problems.
Re: A company sells pens and pencils. The Revenue from pens in 2007 was u [#permalink] 02 Oct 2018, 00:... | {
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• There are certainly incomplete spaces. – amcalde Dec 20 '14 at 4:34
• Yes, I know there are spaces which are not Banach. I can show that such a space is not Banach by showing that some Cauchy sequence doesn't converge. But I've never shown a space is not Banach by showing (if this is even possible) that the space lac... | {
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"openwebmath_score": 0.8974916934967041,
"tags... |
c#, .net, multithreading, thread-safety
Correct solution would be to use a proper data structure. If by any chance you are using .NET 4.0 or later .NET has already provided you with proper solution - MemoryCache class, otherwise I would recommend creating a lock-based class that maintains 2 indexes for entries - a Dic... | {
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"tags": "c#, .net, multithreading, thread-safety",
"url": null
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geophysics, geology, geochemistry, planetary-science
A human tries this experiment on Mars. Same quantity of oil, same heat source and temperature. The only difference is gravity. if on Earth it generated X amount of joules of energy. Will Human on mars get X + some other amount or X - some other amount simply because... | {
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"id": 511,
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"tags": "geophysics, geology, geochemistry, planetary-science",
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worst case, finding the shortest path from $$S$$ to $$T$$ requires us to find the shortest paths from $$S$$ to every other vertex as well. Once you think that you’ve solved the problem, click below to see the solution. The architecture of the BFS algorithm is simple and robust. This is a key point. The classical method... | {
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"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 606.4256710490441,
"openwebmath_score": 0.4215749204158783,
"tags": ... |
ros, opencv, installation, ros-fuerte, cmake
and
pkg-config --cflags opencv says
-I/opt/ros/fuerte/include/opencv -I/opt/ros/fuerte/include
Originally posted by sai on ROS Answers with karma: 1935 on 2014-01-08
Post score: 2
Finally its solved.
From the link http://answers.ros.org/question/61923/how-to-use-newer-v... | {
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general-relativity, black-holes, event-horizon
My way of thinking about this is that it is part of the “no hair” aspect of black holes. If the field perturbation did not become spherically symmetric as the mass or charge approaches the horizon, then by continuity it would not be spherically symmetric when the mass or... | {
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more details: We know that holomorphic differentials are closed, i.e. $d(fdz)=0$. We also know that on a simply connected domain closed forms are exact. This means we can write, using stokes theorem, $$\int_{\gamma}f dz = \int_{\gamma}dg=\int_{\partial\gamma}g=g(\gamma(1))-g(\gamma(0))=g(z)-g(z_0)$$ which shows that th... | {
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thermodynamics
Title: Connecting two vessels of equal volume, one with an ideal gas and other having vacuum Let's say we have two vessels connected by a valve. Both the vessels have the same volume. Initially, there is vacuum in one vessel and the other is maintained at temperature $T_0= 300K$ and pressure $p_0=1 atm$... | {
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"tags": "thermodynamics",
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} |
ocean, geodynamics, geochemistry, mineralogy
Title: What are the implications of the recent discovery that huge oceans exist close to the mantle of the Earth? I was of the notion that as we get deeper into the Earth, it gets hotter and hotter. If so, how can there be huge oceans (they seem bigger than our Pacific) exi... | {
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"tags": "ocean, geodynamics, geochemistry, mineralogy",
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represented as “×.” The biggest difference between these products is that the product of a dot operation is always a single number and that of a cross operation is always a vector. If you have a 90˚ angle between your two vectors, then you will always get a scalar product equal to zero no matter what the magnitudes of ... | {
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• The Stone-Cech compactification (of $\mathbb N$, let's say) can also be viewed as the spectrum of (the Banach algebra) $\ell^{\infty}$, so the analogies are not entirely coincidental perhaps. – Christian Remling Oct 25 '20 at 18:46
• Yes, the Stone-Cech compactification of an LCH $X$ is the Gelfand spectrum of the sp... | {
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$\dfrac{2 + 6 }{10 + 14} = \dfrac{8}{24} = \dfrac{1}{3}$
The ratio between the first 3 terms and the next 3 terms:
$\dfrac{2 + 6 + 10}{14 + 18 + 22} = \dfrac{18}{54} = \dfrac{1}{3}$
We have a constant ratio! What is even more interesting is that this ratio is 1/3, just like before! Below is another sequence that wor... | {
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"lm_q1q2_score": 0.8136808041096526,
"lm_q2_score": 0.8198933337131076,
"openwebmath_perplexity": 236.1384303685121,
"openwebmath_score": 0.8274052739143372,
"tags": ... |
gene-expression
These cells express such a wide complement of proteins because they are involved in T-cell maturation, specifically negative selection.
List of tissues tested in the study:
brain, testes, liver, kidney, lung, colon, skeletal muscle, spleen, cortical thymic epithelial cells, skin epithelial cells | {
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inorganic-chemistry, redox, electronic-configuration, transition-metals, reduction-potential
Title: Why is Cr(2+) a stronger reducing agent than Fe(2+) in water? According to me, $\ce{Fe^{2+}}$ should be a better reducing agent because $\ce{Fe^2+}$ - after being oxidized - will attain a stable $\ce{d^5}$ configuration... | {
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transfer in each region and the set of equations was coupled through boundary condi-tions at the interfaces. Conduction Heat Transfer: Conduction is the transfer of energy from a more energetic to the less energetic particles of substances due to interactions between the particles. 4, Myint-U & Debnath §2. The mathemat... | {
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"lm_q2_score": 0.8175744739711883,
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"openwebmath_score": 0.813318133354187,
"tags":... |
c++, object-oriented, user-interface
std::vector<std::string> const _args;
};
int main(int argc, char *argv[])
{
std::unique_ptr<IServer> server(new NullServer);
std::unique_ptr<IServer> echo(new NullServer);
std::unique_ptr<IFileOperations> traceFile(new NullFileOperations);
// pa... | {
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The result will look something like this :
# An example
Below is a simple example that should run and compile out of the box. For compilation details, look below.
# Compilation notes
Running it is just as simple as with SDL2_image. So that means compilation on Windows is already set up when you installed TTF
### L... | {
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"openwebmath_score": 0.5163815021514893,
"tags":... |
legend = BarLegend[{clfun[Rescale[#, {xmin, xmax}]] &, {xmin, xmax}},
LegendLabel -> "vx", LegendMarkerSize -> {20, 300},
LabelStyle -> {FontFamily -> "Calibri", FontSize -> 15}];
xvzyplot =
Show[Graphics[{PointSize[0.03],
clfun[Rescale[#[[1]], {xmin, xmax}]],
Point[{#[[3]], #[[2]]}]} & /@ xvelzypos, Frame -> True,
Fr... | {
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"lm_name": "Qwen/Qwen-72B",
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"lm_q1q2_score": 0.8107317736524451,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 6663.459321749376,
"openwebmath_score": 0.17257846891880035,
"ta... |
ros, stageros
Originally posted by osuairt on ROS Answers with karma: 69 on 2011-10-23
Post score: 0
You do not particularly need a pgm image - you can use png image files too. If you are at Ubuntu, then you can make png file of your floor layout using gimp and use them with stage.
For the metric, you can play with t... | {
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"tags": "ros, stageros",
"url": null
} |
amateur-observing, observational-astronomy, solar-eclipse
I think the diamond ring can only be seen with the naked eye. It consists of the inner corona on one side of the moon and the last bit of photosphere on the opposite side of the moon. I believe that the inner corona is not visible in any type of filter. That is... | {
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"tags": "amateur-observing, observational-astronomy, solar-eclipse",
"url": null
} |
cross-correlation, synchronization
# Make 2 vectors to test, 1 being a shifted version of the other
x = np.asarray([1,2,3,4])
y = np.asarray([.5,1,2,3])
# Cross-correlate
correlation = correlate(x, y, 'full')
# Get the lag vector that corresponds to the correlation vector
lags = correlation_lags(x.size, y.size, mo... | {
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"tags": "cross-correlation, synchronization",
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} |
c#, performance, linq, .net-datatable, join
foreach (var child in childRows)
{
jt.Rows.Add(row["Key"], row["Key2"], row["Data1"], row["Data2"], child["Data3"], child["Data4"]);
}
}
jt.Rows.Dump(); // LINQPad dump
As far as your code is concerned I'm not happy with the Koncat method because it modifie... | {
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} |
# Project Euler Problems 5-6
## Problem 5¶
2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
This is an interesting problem!
First thing's first, we can establi... | {
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"openwebmath_score": 0.6706660985946655,
"tags":... |
group-theory, mathematics, lie-algebra
In your case there is only one generator (the 1-dimensional vector $1$, or any other real number, because it is the only "base vector" of $\mathbb{R} \sim u(1)$). On the other hand, I would say that $e^{i \pi}$ is just an element of the group, not a generator of the group (genera... | {
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"tags": "group-theory, mathematics, lie-algebra",
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} |
python, game, console
def attackShip(whosTurn,attackerGridClass,defenderGridClass,defenderFleetClass):
newAttack="Y"
numShipsInFleet=len(defenderFleetClass.shipStatusDict)
while newAttack=="Y":
if whosTurn=="player":
attackCoords=raw_input("Input attack coordinates: ")
x... | {
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"openwebmath_score": null,
"tags": "python, game, console",
"url": null
} |
fluid-dynamics, pressure, measurements, atmospheric-science
Meteorologists certainly can do that, and in fact do do that, all the time. They use weather balloons, sounding rockets, and all other kinds of instrumentation to measure conditions in the atmosphere. The resulting picture is rather complex. Conditions vary w... | {
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"tags": "fluid-dynamics, pressure, measurements, atmospheric-science",
"url": null
} |
python, javascript, html, game, server
$('document').ready(function() {
/**
* Remove one "stone" from the board.
*/
$("#remove1").on('click', function() {
game.playerMove(1);
});
/**
* Remove two "stones" from the board.
*/
$("#remove2").click(function() {
game.... | {
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"tags": "python, javascript, html, game, server",
"url": null
} |
c++, tic-tac-toe, c++14
Separate I/O from logic
The Player::move routine prints a prompt, gets input from the user and then applies that to the board. It would be better to separate I/O from the game logic so that the game is cleanly separated from the I/O. This would, for example, make it much easier to convert the... | {
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"tags": "c++, tic-tac-toe, c++14",
"url": null
} |
# print g(x,y) at the selected range
# by defaults wasora interpolates using nearest neighbors
PRINT_FUNCTION g FILE_PATH g_int.dat MIN 0 0 MAX 2 2 STEP 0.05 0.05
$wasora nearest.was$ gnuplot nearest.gp
$ ## 1.3 rectangle.was This time, a function h(x,y) is defined by reading point-wise data from a file. This file is g... | {
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"openwebmath_score": 0.6308490037918091,
"tags": n... |
### A Zero at the Origin
A zero at the origin is just like a pole at the origin but the magnitude increases, and the phase is positive.
##### Key Concept: Bode Plot for Zero at Origin
• For a simple zero at the origin draw a straight line with a slope of +20 dB per decade and going through 0 dB at 1 rad/ sec. An nth... | {
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"lm_q1q2_score": 0.8174591561260882,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 960.2559998778279,
"openwebmath_score": 0.8952716588973999,
"tags": ... |
Roughly, one may say that all perturbations in the last row tend to spread a number of eigenvalues equally distributed around a scaled unit circle. Moreover, the lower left corner is the most sensitive position.
Now it gets more shaky, but if we consider a perturbation in every entry of the last row and each is compar... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232914907946,
"lm_q1q2_score": 0.8211326799223712,
"lm_q2_score": 0.8354835371034368,
"openwebmath_perplexity": 265.6323066576666,
"openwebmath_score": 0.8915950655937195,
"tags... |
java, performance, beginner, interview-questions
return arr;
}
public static void main(String[] args) {
int [] arr = sortKMessedArray(new int[]{1,0},1);
for( int m : arr )
System.out.println(m);
}
}
I have the following questions regarding my approach:
1) How can I further improve my approach?
2)... | {
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"tags": "java, performance, beginner, interview-questions",
"url": null
} |
hvac, cooling, evaporation
A room air conditioner does exactly the same thing except that in this case, the heat from the warm refrigerant is exhausted outside the room and the temperature of the cold coils where the water is condensed is low enough to actually freeze the water solid if it does not promptly drip off t... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "hvac, cooling, evaporation",
"url": null
} |
performance, vba, excel
7 - Pausing for a brief nitpick, the If block beginning with If Not cell Is Nothing Then should be indented another level.
8 - Avoid round trips to the Worksheets, especially in the loops. You can pull all of the values from a range of cells as an array like this:
Dim allValues As Variant
allVa... | {
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"tags": "performance, vba, excel",
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} |
haskell, statistics
-- the product of a Vector multiplied by a scalar
vectorScalarProduct :: Double -> Vector -> Vector
vectorScalarProduct n vec = [ n * x | x <- vec ]
-- the prodict of a Matrix multiplied by a scalar
matrixScalarProduct :: Double -> Matrix -> Matrix
matrixScalarProduct n m = [ vectorScalarProduct n... | {
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"tags": "haskell, statistics",
"url": null
} |
each element of the original vector multiplied by the number. MATLAB - Scalar Multiplication of Vectors. It may concern any of the following articles: Dot product – also known as the "scalar product", an operation that takes two vectors and returns a scalar quantity. Scalar multiplication of vectors: Quelle: enwiki: Ur... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.97997655637136,
"lm_q1q2_score": 0.8229195979769892,
"lm_q2_score": 0.839733963661418,
"openwebmath_perplexity": 404.45264643885446,
"openwebmath_score": 0.8674150109291077,
"tags": n... |
ros, ros-indigo
Do i need to download Linux? Or is ROS a flavor of Unix, similar to Ubuntu?
ROS is not a stand-alone operating system, so yes, you'll have to install (after downloading) an appropriate base OS. Linux (in the form of Ubuntu) is one of the most used ones with ROS, but others can be made to work as well.... | {
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"tags": "ros, ros-indigo",
"url": null
} |
actuator, nxt, yaml, nxt-ros, sensor
Title: Which node reads the configuration file?
Hello,
I am working with NXT-ROS. To define the sensors and actuators, you need to create a robot.yaml file. My question is, how is this file used? Is it read by some other node? By which?
I think it might be the node nxt_ros, but i ... | {
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"tags": "actuator, nxt, yaml, nxt-ros, sensor",
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java, object-oriented
So each of your four-line if-statement segments can each become one line!
for (int i = 0; i < fillUps.length; i++) {
minDist = Math.min(fillUps[i].getDist(), minDist);
maxDist = Math.max(fillUps[i].getDist(), maxDist);
minMPG = Math.min(fillUps[i].getMilesPerGallon(), minMPG);
max... | {
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"tags": "java, object-oriented",
"url": null
} |
interference, huygens-principle
Title: Huygens Principle and Interference If Huygens Principle states that every point on a wave acts as a source of secondary wavelets, then:
Is the new wavefront formed by the interference of these secondary wavelets?
If so, then how can a light source have uniform intensity if ther... | {
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"tags": "interference, huygens-principle",
"url": null
} |
javascript, beginner
while (true) { // this loop runs forever
var input = prompt("Please enter a number or press enter to exit: ");
if (!input)
break; // leave the loop
input = parseInt(input)
if (isNaN(input)) {
alert("That is not a number!");
} else if (input <... | {
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"openwebmath_score": null,
"tags": "javascript, beginner",
"url": null
} |
python, linux
def _edit_group_file(self) -> None:
logging.info("editing group files")
groups = get_groups_matching_arguments(self._args, self._groups)
if groups is None:
logging.error("Could not find a suitable group")
sys.exit(EXIT_ERROR)
paths = [str(group.path... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, linux",
"url": null
} |
homework-and-exercises, quantum-field-theory, hilbert-space
Title: How many particles in $\phi_0(x)^2|0\rangle$? In Schwartz's "QFT and the standard model" on pg 22 he writes:
A two or zero particle state as in $\phi_0(x)^2\left|0\right>$. | {
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discrete-signals, fourier-transform
Title: Magnitude and phase graph of DTFT I did a Discrete time Fourier transform of the following signal:
$$x[1]=4\quad x[-1]=-4$$
The result is
$$4e^{j\omega}-4e^{-j\omega}$$
We were supposed to draw the magnitude and phase graph of this complex function.
Firstly, I turned it into ... | {
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"tags": "discrete-signals, fourier-transform",
"url": null
} |
gazebo, moveit, ros-melodic
Title: How to solve problem with PATH_TOLERANCE_VIOLATED in moveit?
Hi everyone,
I am facing with problem when I want to execute my trajectory in moveit and see it in Gazebo because of error which says:
Controller failed with error PATH_TOLERANCE_VIOLATED
what should I do to solve this er... | {
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"tags": "gazebo, moveit, ros-melodic",
"url": null
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performance, sql, postgresql
So it turns out that you seem to have a lot of full joins in your query. I can't offer much guidance on how to change it without knowing your table schema, but you should absolutely think about why you're using them and if they can be changed to another kind of join. I'm sure it's a point ... | {
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We have to show on the biggest power (similar to the first type) as the most relevant:
$\frac{\displaystyle\prod_{i=1}^{k} (n-i)}{n^{n-k-1}}\frac{x^{n-k}}{k!}\sim\frac{n^{k-1} }{n^{n-k-1}}\frac{x^{n-k}}{k!}=n^{k-1-(n-k-1)}\frac{x^{n-k}}{k!}=n^{2k-n}*\frac{x^{n-k}}{k!}=\frac{1}{k!}*\frac{x^{n-k}}{n^{n-2k}}$
Again: ${n... | {
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"lm_q1q2_score": 0.837746532885226,
"lm_q2_score": 0.8479677506936878,
"openwebmath_perplexity": 430.0939433615108,
"openwebmath_score": 0.9316465258598328,
"tags... |
computer-architecture, computer-networks
I dont understand why we need to take the expected bandwidth. Why can't we simply use the maximum bandwidth utilization?
Thanks in advance! You can have ten of them going at once. If they're on a third of the time and you decree that, for instance, ten operate for twenty secon... | {
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"tags": "computer-architecture, computer-networks",
"url": null
} |
differential-geometry, metric-tensor, coordinate-systems, topology
Title: Understanding the shape of 2-dimensional orbifold given a metric tensor I am trying to grasp some intuition about the shape represented by the following two-dimensional metric tensor:
$$ds^2=dr^2+n^2\cdot r^2d\theta^2 $$
where $r$ is "radial" co... | {
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"id": 96022,
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"tags": "differential-geometry, metric-tensor, coordinate-systems, topology",
"url": null... |
electromagnetism
The non-conservative force at work inside an acid battery is the random jostling of the liquid molecules surrounding the charged ions. The positive ions are being electrostatically pushed toward the cathode, but for chemical reasons they are being produced faster than they are being absorbed at the c... | {
"domain": "physics.stackexchange",
"id": 46802,
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"openwebmath_score": null,
"tags": "electromagnetism",
"url": null
} |
What about sin ax and tan ax?
It would be great if anyone could just give me the link to read up on this. I'm still a novice so something that's easy to understand would be preferable. But I will post questions if I don't understand | {
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"openwebmath_score": 0.8840986490249634,
... |
mechanical-engineering, electrical-engineering, hvac
Title: Calculating kWh for different timestep I have a simulation software which shows energy consumption at 30 minutes timestep. If a system consumes 0.06 kWh at 6am, and 0.09 kWh at 630am, how to calculate the energy consumption between 6-7am? Can I assume it is t... | {
"domain": "engineering.stackexchange",
"id": 183,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mechanical-engineering, electrical-engineering, hvac",
"url": null
} |
deep-learning, neural-network, nlp, word-embeddings, embeddings
That's where the misunderstanding comes from. Having one layer printed after the other does not imply that they are connected. They are not.
The first embedding is the normal token embedding, with 50257 token IDs.
The second embedding is the positional en... | {
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"tags": "deep-learning, neural-network, nlp, word-embeddings, embeddings",
"url": nul... |
php, html, datetime, layout
echo '</div><div style="clear:both;"></div><hr width="800px;" align="left"/>';
}
echo '<div class="m_start">'.mb_strtoupper($month['monthname'],'UTF-8').'<br />';
echo '<span class="yearsmall">'.$month['year'].'</span>';
echo '</div>';
echo '<div class="courses">';
... | {
"domain": "codereview.stackexchange",
"id": 29164,
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"openwebmath_score": null,
"tags": "php, html, datetime, layout",
"url": null
} |
This function enables us to say that the $6^{th}$ rational number is $2/3$. Moreover, this function is a bijection. For proof of this, see Theorem 5.1 here http://faculty.plattsburgh.edu/sam.northshield/08-0412.pdf.
Since $f$ is a bijection this implies that $f^{-1}$ exists. That means given a rational number we can f... | {
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"lm_q2_score": 0.8596637487122111,
"openwebmath_perplexity": 522.3228458510459,
"openwebmath_score": 0.9798880815505981,
"tag... |
atmospheric-science, weather
Context: I'm interested in the slant depth $[g/cm^2]$ distribution and the resulting muon production - they are dependant on the pressure and air mass distribution. The atmosphere is a dynamic compressible fluid under rather regularly changing conditions of heat, which affect its temperatu... | {
"domain": "physics.stackexchange",
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "atmospheric-science, weather",
"url": null
} |
homework-and-exercises, gravity, potential-energy
Title: Statements about gravitational potential energy contradicting intuition? So in my textbook I am told:
two masses have gravitational potential energy because work had to be done in order to move one the masses form a position very far away (lets say infinity) to ... | {
"domain": "physics.stackexchange",
"id": 13754,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, gravity, potential-energy",
"url": null
} |
ros2
Originally posted by ROS_user on ROS Answers with karma: 18 on 2021-09-21
Post score: 0
Original comments
Comment by ROS_user on 2021-09-21:
I don't know if that "line 87" refers to the file app.c of the ping_pong app. But if that is the case, I leave you here the line it would be referring to.
Comment by ROS_us... | {
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"tags": "ros2",
"url": null
} |
vba
...
With .Columns(1)
nTotVals =.SpecialCells(xlCellTypeConstants, xlTextValues).Count
If nTotVals > nBUniqueVals Then
newList = Application.Transpose (.Cells(nBUniqueVals + 1, 1).Resize(nTotVals - nBUniqueVals))
End If
End With
' more code...
End With
And so yo... | {
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"openwebmath_score": null,
"tags": "vba",
"url": null
} |
solutions, ph, temperature
Short discussion on the pH: because the scale is logarithmic and your 2 $\ce{pH}$ values are actually not that far from each other the linear estimate is still ok-ish. If, for example, you would have used $\ce{pH}$ 0 and 7 you would have found $\ce{pH}=0.17$ vs. $2.33$ from your estimate. | {
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"id": 1100,
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"openwebmath_score": null,
"tags": "solutions, ph, temperature",
"url": null
} |
java, parsing, serialization
put(File.class, new TypeParser<File>() {
@Override
public File parse(String value) {
return new File(value.trim());
}
});
put(String.class, new TypeParser<String>() {
@Override
public String parse(... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, parsing, serialization",
"url": null
} |
c#, performance, ms-word
Title: Saving and/or Printing a Word Document From C# This is the Microsoft Word portion of the application described in this question. It is considerably simpler than the excel portion of the project. Any classes not defined in this question can be found in the excel question. The full source... | {
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"openwebmath_score": null,
"tags": "c#, performance, ms-word",
"url": null
} |
machine-learning, deep-learning, transformer, gpt
Title: Can I fine tune GPT-3? Can anyone fine-tune the GPT-3 model on commodity hardware without GPU?
What I meant is can we fine tune available GPT-3 equivalent models?
For example, we have only access to GPT-J.
Can we fine-tune GPT-J with commodity hardware or lets ... | {
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"tags": "machine-learning, deep-learning, transformer, gpt",
"url": null
} |
python, beginner, python-3.x, comparative-review, game-of-life
is redundant; the comment provides no more information than the code itself (you can assume someone reading through your code knows as much Python as you do). Instead, comments should be used where it is not immediately obvious why the code does it.
Const... | {
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"tags": "python, beginner, python-3.x, comparative-review, game-of-life",
"url": null
... |
complexity-theory, time-complexity, trees, recurrence-relation, master-theorem
If you sum up the costs, you get $n + 2 \cdot n/2 + 4 \cdot n/4 + \dots + n \cdot 1 = O(n \log n)$. Moreover, the complexity over this particular type of tree is $\Omega(n \log n)$.
Now, let us talk about any general tree. Any node of the ... | {
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"tags": "complexity-theory, time-complexity, trees, recurrence-relation, master-theorem",
"url... |
scikit-learn, feature-selection, linear-regression, beginner
Title: How do I fine-tune model performance after the initial run? (Scikit-Learn) I've just started learning regression using scikit-learn and stumbled upon a problem. For a given dataset, let's say that I've imputed the missing data and one-hot encoded all ... | {
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"id": 10574,
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"tags": "scikit-learn, feature-selection, linear-regression, beginner",
"url": null
} |
• This theorem might help to prove $f'$ or $f$ has no rational roots. And see the references of this article they are about $f,f'$ having rational or integer roots – reuns Jun 7 '17 at 0:10
• @user1952009 Thanks: The latter article references an AMM piece, which I looked up to see what had cited it. In this way, I came... | {
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"lm_q1_score": 0.9732407121576652,
"lm_q1q2_score": 0.8420713039943907,
"lm_q2_score": 0.865224084314688,
"openwebmath_perplexity": 724.238168911556,
"openwebmath_score": 0.2876512408256531,
"tags"... |
catkin-make, catkin
-- catkin 0.5.65
-- BUILD_SHARED_LIBS is on
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~ traversing 3 packages in topological order:
-- ~~ - output_h_w
-- ~~ - pr2_moveit_generated
-- ~~ - sam_move_head_down
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing ca... | {
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"id": 14890,
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"openwebmath_score": null,
"tags": "catkin-make, catkin",
"url": null
} |
it always passes through vertex. Potent tools in mathematics potent tools in mathematics sense then ax2 + bx + c = 0 represents quadratics. Equations by completing the square.The standard form online calculator to your website through which function. Given equation faster, and they represent known numbers and our quadr... | {
"domain": "p-palaceimmobilier.com",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692366242306,
"lm_q1q2_score": 0.8117518481198199,
"lm_q2_score": 0.8311430499496096,
"openwebmath_perplexity": 548.1103188028409,
"openwebmath_score": 0.6156752109527588,
... |
ros, python, ros2, communication, topics
Originally posted by anonymous53443 on ROS Answers with karma: 63 on 2020-05-02
Post score: 0
Original comments
Comment by MCornelis on 2020-05-04:
What is the reason for separating the robots by ROS_DOMAIN_ID? Is it not easier to just name_space the robots and have them in th... | {
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"tags": "ros, python, ros2, communication, topics",
"url": null
} |
homework-and-exercises, general-relativity, perturbation-theory, linearized-theory
$$R_{\mu \nu}^{(2)} = \partial \Gamma^{(2)} + \partial \Gamma^{(2)} + \Gamma^{(2)} \Gamma + \Gamma \Gamma^{(2)} + \Gamma^{(1)}\Gamma^{(1)} $$
Now, $(7.153)$ shows the part of $R_{\mu \nu}^{(2)}$ computed from $h_{\mu \nu}^{(1)}$ only.... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, general-relativity, perturbation-theory, linearized-theory... |
tree, collections, rust
They work, but I would like to be able to parametrize the key too and not just the value. And the remove_dup / remove_dup_internal is because there was a strange compiler error about borrowing I couldn't solve.
Idiomatic Rust style is to place braces on same line. When the function definition... | {
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"id": 22783,
"lm_label": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "tree, collections, rust",
"url": null
} |
c#, algorithm, tree, pathfinding
// If Uncle is red, there is a certain error since we are red and parent is red
// Make g red, and u and p black. No more error. Red grandparent needs to be checked though
// If uncle isn't red and parent IS red then the fix is different, and we move to case 4
private void ... | {
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"tags": "c#, algorithm, tree, pathfinding",
"url": null
} |
ros2, urdf, ros-humble, robot-state-publisher, errors
<joint name="Ball 24" type="Ball">
<origin xyz="0.112348 0.005 -0.030915" rpy="0 0 0"/>
<parent link="boggiesidelegupl_1"/>
<child link="boggiesidelegr_1"/>
</joint>
<joint name="Revolute 25" type="continuous">
<origin xyz="0.139111 0.02703 -0.494042" rpy=... | {
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"id": 38862,
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"tags": "ros2, urdf, ros-humble, robot-state-publisher, errors",
"url": null
} |
quantum-mechanics, time-evolution, open-quantum-systems
$$\dot{\rho}(t)=-i \left[H(t),\rho(t)\right]+\frac{1}{2}\sum_n \left( 2C_n \rho(t) C_n^{\dagger} - \rho(t) C_n^{\dagger} C_n- C_n^{\dagger} C_n \rho(t) \right)$$
The $-i \left[H(t),\rho(t)\right]$ term is the usual unitary time evolution due to the system Hamilto... | {
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"id": 95746,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, time-evolution, open-quantum-systems",
"url": null
} |
ros2, ros-humble, rclcpp, ros-foxy
Title: What is the difference between RCL_STEADY_TIME, RCL_SYSTEM_TIME and RCL_ROS_TIME? I wrote the following code to check the difference myself, but I could not find any considerable difference.
#include <rclcpp/rclcpp.hpp>
auto main(int argc, char **argv) -> int
{
rclcp... | {
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"openwebmath_score": null,
"tags": "ros2, ros-humble, rclcpp, ros-foxy",
"url": null
} |
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