text stringlengths 1 1.11k | source dict |
|---|---|
ornithology, ethology, history, forestry
Title: Giant inflatable laboratory in the jungle. How to find it? When I was a child (circa year 2000), I watched a documentary (in English) about some biologists doing research about jungle (perhaps Amazon). The biologists lived in a base which was a huge inflatable structure,... | {
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"tags": "ornithology, ethology, history, forestry",
"url": null
} |
mechanical-engineering
My intuition is #1. Since the mechanism converts velocity to torque, it has high velocity and low torque on the motor side, but low velocity and high torque on the lifting side. So while the strength of individual gear teeth is the same throughout the mechanism, they're subjected to higher force... | {
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} |
Before diving into a proof, here are two useful lemmas.
Lemma 1: Suppose such $\tn$ and $\tp$ exist. Then for any $t_0 \in [\tn,\tp]$, $m(t_0) < \infty$.
Proof. This follows from convexity of $e^x$ and monotonicity of the integral. For any such $t_0$, there exists $\theta \in [0,1]$ such that $t_0 = \theta \tn + (1-\t... | {
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"openwebmath_score": 0.9307129383087158,
"tag... |
optics
Title: Missing factor of 1/2 in the definition of light intensity The light field can be written as $E=A \cos\theta$ where $\theta=kz+wt$ is the phase of light wave.
What we measure or see is the intensity which is the square of the light field
$$I=E^2=A^2 \cos^2\theta$$
Can anyone explain why most of the te... | {
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"tags": "optics",
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} |
special-relativity, inertial-frames
Now if there's an observer made up of entirely identical particles, would it be able to know it was accelerated?
If it can't, how would it solve the twin paradox? If you are in a spaceship that starts to accelerate with acceleration $\vec a$ then relative to the spaceship all object... | {
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"tags": "special-relativity, inertial-frames",
"url": null
} |
relation: Definition the divisibility on! ( 1,1 ) ( 3,3 ) should be included antisymmetric relation at 488 nm from an training vectors. In fact, a function in two possible ways it must also be asymmetric if it … Here my. Equal to on the real number system Sir 7,098 views 4:43 total –! Learn the rest of the observation ... | {
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"lm_q2_score": 0.8519528019683106,
"openwebmath_perplexity": 629.8278547309131,
"openwebmath_score": 0.83173435926437... |
hadamard, linear-algebra
(1) It is important to keep in mind the order of tensor products when combining the states of multiple qubits into a state vector. For example, if you have two entangled qubits and then want to incorporate a third qubit into the state vector, you could do the math one of two ways:
$ \begin{bma... | {
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"tags": "hadamard, linear-algebra",
"url": null
} |
python, python-3.x, converting
def get_clipboard_lines():
"""Retrieve the content of the clipboard.
Lowercase and strip it to ease further computation.
Create the QApplication beforehand to be able to get that content.
"""
app = QtGui.QApplication(sys.argv)
return [line.strip().lower()
... | {
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"tags": "python, python-3.x, converting",
"url": null
} |
c#, winforms, timer
Separation of Concerns
We see here several consequences of a user action bunched up:
stopWatch = Stopwatch.StartNew();
state = StateEnum.Started;
ChangeButtonText(StartAndLapButton, "Lap");
ChangeFormTitle("Started");
timer1.Enabled = true;
Suppose you decided to change one aspect, say how times a... | {
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"tags": "c#, winforms, timer",
"url": null
} |
coordinate, history, zodiac
Note that not all astrological traditions are based on the tropical year. Hindu astrology, for instance, is based on the sidereal zodiac - i.e. it aligns permanently with the visible stars, regardless of the Earth's axial precession. Some modern Western astrologers also use a sidereal zodia... | {
"domain": "astronomy.stackexchange",
"id": 3134,
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"tags": "coordinate, history, zodiac",
"url": null
} |
python, socket, encryption
def game_play(self) -> None:
self.player1_conn.send(self.pubkey.exportKey())
self.player2_conn.send(self.pubkey.exportKey())
choice_1_cipher = self.player1_conn.recv(1024)
choice_1_plain = self.token.decrypt(choice_1_cipher)
print('Got first choice, wa... | {
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"tags": "python, socket, encryption",
"url": null
} |
human-biology
If you are interested in a deeper look on the composition of the mosquito saliva have a look at these two articles and their references (if there is help needed in getting the articles, let me know): | {
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"tags": "human-biology",
"url": null
} |
quantum-mechanics, homework-and-exercises, operators, commutator
Title: Problem 2.1 (c) from Quantum Mechanics (author: Eugene D. Commins) The task is:
Show that the equation $[A,B] :=AB-BA= iqI$, where $q\neq 0$ is a non-zero real constant and $I$ is the identity matrix cannot be satisfied by any finite dimensional ... | {
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"tags": "quantum-mechanics, homework-and-exercises, operators, commutator",
"url": null
} |
c#, html, .net
Title: Avoid redundancy of HTML entities in .NET framework I have to store various HTML named character references for the following purposes:
Escaping special characters myStringBuilder.Replace("À", WebHelper.Agrave)
Insert spaces in legacy reports ReportButtons.Controls.Add(New LiteralControl(WebHelp... | {
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"tags": "c#, html, .net",
"url": null
} |
molecular-biology, immunology
To produce highly specific antibodies, the body has to undergo a specific immune reaction against these peptides. In the beginning of this reaction antibodies usually have a rather low affinity (bind only weak) against their antigen. This is changed by the so called affinity maturation in... | {
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"tags": "molecular-biology, immunology",
"url": null
} |
object-oriented, array, vba
ReDim arrayOfRowsToKeep(lastRow - firstRow + 1) As Variant
keepCount = 0
For row = firstRow To lastRow | {
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"tags": "object-oriented, array, vba",
"url": null
} |
php, performance, unit-testing, database
Title: My first model test in PHPUnit I've just created a test to create my table gateway class. I've written about 8 tests and all are passing. I'm hoping anyone can offer any advice on what to do next to make these better. This is quite a small app and just one of my own, but... | {
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"tags": "php, performance, unit-testing, database",
"url": null
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For the first question, I show that for some sequence $x_n \in S$ that converges to $\hat{x} \in \overline{S},$ $\overline{f}(x_n)$ converges to $\overline{f}(\hat{x})$ since uniformly continuous functions take Cauchy sequences to Cauchy sequences and since $\mathbb{R}$ is complete. However, I feel like while this show... | {
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"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 44.444754589955146,
"openwebmath_score": 0.9872759580612183,
"ta... |
terminology, computer-architecture, cpu
edit - I didn't really address this part of the question:
"And you have a data bus that can pick up 4 contiguous memory locations, bytes, at a time. So I suppose if the CPU wanted address 0, then it'd pick up address #0,#1,#2,#3 And if the CPU wanted address 1, then it'd pick up... | {
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"tags": "terminology, computer-architecture, cpu",
"url": null
} |
beginner, ios, animation, swift
My first problem is that despite animating this change, we're sending false as the animate argument to all of the willAppear-esque methods of these view controllers.
My other problem is the order in which these methods are called.
The viewWillAppear and viewWillDisappear methods for bot... | {
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"tags": "beginner, ios, animation, swift",
"url": null
} |
ros, ros-hydro
Title: can't locate node in package
HI everybody, I am having problems in building a large project. I'am trying to add some modularity to my .launch file. I built my launch file as follows
<launch>
<include file="$(find gazebo_ros)/launch/empty_world.launch">
<arg name="world_name" value="$(find vt... | {
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of octagon. In this video, we'll talk about a few things you need to know about polygons for the GMAT, some of their basic names of regular polygons, and the sum of the interior angles of a polygon. Collectively recall the various expressions discovered from the previous lessons. The simplest polygon is a triangle (a 3... | {
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"lm_q2_score": 0.8376199694135332,
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"openwebmath_score": 0.2936362624168396,
"tags":... |
ros, pcl, pcl-conversions, velodyne, pointcloud
void save_3d_lidar(velodyne_msgs::VelodyneScan::ConstPtr v_scan,nav_msgs::Odometry::ConstPtr gps_pose)
{
pcl::PointCloud<pcl::PointXYZI> cloud_3d;
pcl::PointXYZI point;
velodyne_rawdata::RawData data;
cloud_3d.clear();
for(int i=0;i<v_scan->packets... | {
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} |
c++, c++14
EDIT2: I've just found that if I derive from this template, I need to import all overloaded operators into the derived class. Is there a better way? Headers
For forward declarations of streams, use <iosfwd> in the header - it's more lightweight than requiring <istream> and <ostream>. You'll need the latter... | {
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$$\Omega^C = \emptyset \phantom{00} \text{or} \phantom{00} !\Omega = \emptyset ,$$
which is to say that everything is in the universal set, Ω, and nothing is outside of it.
### Subsets
A subset is a set entirely contained within another. For example, the set $\{a, b, c \}$ is a subset of the set of all lower-case le... | {
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"openwebmath_perplexity": 335.2520249717423,
"openwebmath_score": 0.9241943955421448,
"tags": nul... |
java, homework, connect-four
if(isWin){
for(count=0;count<board.length;count++){
for(count2=0;count2<board.length;count2++){
System.out.print(board[count][count2]+" ");
}
System.out.println();
}
System.out.printl... | {
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quantum-mechanics, optics, photons, atomic-physics, quantum-optics
\end{array}
$$
Is the expression in eq. $(4)$ correct, and what would be the resulting quantum-state? You are definitely on the right track - I can think of two ways to proceed from here. The answers have quite a few terms!
Exactly as you said, we star... | {
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"tags": "quantum-mechanics, optics, photons, atomic-physics, quantum-optics",
"url": null... |
algorithms, graphs, optimization
In particular, at each point in time, we will have a partial solution (some sets that can be colored with $\le m$ colors). We will incrementally select a set to add to the partial solution greedily. We can prioritize the sets as follows, to help us select the next set. The priority ... | {
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"tags": "algorithms, graphs, optimization",
"url": null
} |
c#, async-await, socket
private async Task ReceiveAsync(CancellationToken token)
{
try
{
await using var stream = new MemoryStream();
var buffer = new Memory<byte>(new byte[_options.ReceiveBufferSize]);
var read = 0;
while (!token.IsCancellationReq... | {
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"tags": "c#, async-await, socket",
"url": null
} |
general-relativity, black-holes, universe, wormholes, white-holes
If you now rotate the black hole, or you add electric charge to it, or both, you can find geodesics that pass through the event horizons (there are now two of them!), miss the singularity and travel back out of the black hole again.
But, and this is whe... | {
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"tags": "general-relativity, black-holes, universe, wormholes, white-holes",
"url": null
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nuclear-physics
At internuclear distances, the most important of these is the strong interaction. At interatomic distances, the winner is the magnetic dipole-dipole interaction. (Magnetic scattering of neutrons in matter is associated with milli-eV transitions, but that's not necessarily a purely electromagnetic inter... | {
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"tags": "nuclear-physics",
"url": null
} |
c++, beginner, validation, floating-point
void printErrorMsg(decimal_input_errc err_code)
{
switch(err_code)
{
case decimal_input_errc::hyphen_not_at_beginning:
std::cout << "- is allowed only at the beginning. Try again. ";
break;
// ... and so on...
Even better would be to have a fun... | {
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"tags": "c++, beginner, validation, floating-point",
"url": null
} |
If the grid is uniform then x and y can be specified as vectors. A cone plot is the 3D equivalent of a 2D quiver plot, i. Duane Q. Then we customize the title and the legend of our graphics.
It can plot lots of different types of functions in a really intuitive way. We present examples of some of these here. You can s... | {
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"openwebmath_score": 0.3530292510986328,
"tags": null,
... |
wind
Title: Wind wall of depression It's a wind map from the ICON (13km grid) model of the Atlantique ocean of this 7 July 2023. I get that there's two depression near each other interacting but how there's only a very thin line as the resulte of the interaction ? If it's not an artifact from the model, why is it SO t... | {
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"tags": "wind",
"url": null
} |
growth, cell-division
The answer is physics, specifically the ability for a body of a specific shape and structure to support itself and move itself, followed by the energy requirement to feed all those cells.
Strength of a bone scales with its cross sectional area, similar to muscle. Mean while mass scales with its ... | {
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"tags": "growth, cell-division",
"url": null
} |
proof-assistants, automated-theorem-proving, haskell
There are several Haskell libraries built on-top-of SMT solvers to access these features. So, the answer to your question is a qualified "yes." If you squint the right way, then you can code and prove properties of many Haskell functions using SMT-solvers.
I say "sq... | {
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} |
slam, ekf
I can understand running a particle filter for estimating feature
depth if camera pose is known. I tried to implement such a concept in this project: where I read the camera pose from a ground truth file and keep triangulating the depth of features w.r.t world reference frame
I can also comprehend running a ... | {
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} |
c#, winforms, interface, xaml
public string DoorDescription { get; private set; }
public Location DoorLocation { get; set; }
}
}
And here is the WinForms to make it work. Leaving out IDE generated code.
ExploreTheHouseForm.cs
using System;
using System.Windows.Forms;
namespace House
{
public partial... | {
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"tags": "c#, winforms, interface, xaml",
"url": null
} |
quantum-gate, ibm-q-experience
circ.h(q[3])
Then, given that the compiler listens to your request and still uses the ALAP scheduling method, the first H would play at t=(758-120)ns=638ns, the second would play at t=(1516-120)ns=1396ns, and the third would play at t=1516ns.
Answers to questions
1) The first H and the... | {
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quantum-field-theory, conformal-field-theory, path-integral
Title: From $H_3^+$-WZW to Liouville gravity: Why should I use auxiliary fields? Context: auxiliary fields
I am new to the field of CFT (conformal field theory), and I am reading two articles, $H^+_3$ WZNW model from Liouville field theory, by Y. Hikida and V... | {
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"tags": "quantum-field-theory, conformal-field-theory, path-integral",
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cmake, raspberrypi, colcon
Invoking command in '/home/ubuntu/ros2/build/composition': AMENT_PREFIX_PATH=/home/ubuntu/ros2/install/example_interfaces:${AMENT_PREFIX_PATH} CMAKE_PREFIX_PATH=/home/ubuntu/ros2/install/example_interfaces:/opt/ros/humble LD_LIBRARY_PATH=/home/ubuntu/ros2/install/example_interfaces/lib:${LD_... | {
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"tags": "cmake, raspberrypi, colcon",
"url": null
} |
– Explanation & Examples in ratio 9:10:17 act in the plane at one point balance... Of a parallelogram – Explanation & Examples ; area of your parallelogram squared is equal to the magnitude of parallelogram. Ratio 9:10:17 act in the plane at one point to balance the parallelogram = the magnitude of vector! By two pairs... | {
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"openwebmath_score": 0.6432327032089233,
"t... |
java, array, java-8
For example:
When inserting 8, it doesn't exist in the list, the returned \$x = -3\$, so we should insert at position \$-x -1 = 3 - 1 = 2\$.
When inserting 2 for the second time, the returned \$x = 1\$, so we should insert at position 2.
Conclusion
It's not worth trying to keep the list sorted. T... | {
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relation have to solve for a function its... More than one variable ) in it incrementally rather than continuously then equations... One differential coefficient or derivative of an unknown variable is known as non-linear differential equations have their shortcomings the finite!, Please send feedback building various ... | {
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"lm_q2_score": 0.8519527982093666,
"openwebmath_perplexity": 846.8603279618608,
"openwebmath_score": 0.5220600366592407,
"tag... |
c++, template, classes, stl, knapsack-problem
Once you get the knapsack class right, you will avoid any need for the rest of the absurdity in your code, like the fact that you have a knapsack class, yet you’re keeping track of the objects in the knapsack using a separate vector (objlist). Isn’t that weird? When you pu... | {
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"tags": "c++, template, classes, stl, knapsack-problem",
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} |
ros-melodic
[ 91%] Linking CXX shared library /home/adas/lsd-slam_workspace/devel/lib/liblsdslam.so
/usr/bin/ld: cannot find -lcsparse
collect2: error: ld returned 1 exit status
lsd_slam/lsd_slam_core/CMakeFiles/lsdslam.dir/build.make:755: recipe for target '/home/adas/lsd-slam_workspace/devel/lib/liblsdslam.so' faile... | {
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ago. We can therefore compute the score for each pair of nodes once. END OF MULTIPLOT JUSTIFICATION CENTER MOVE 50 98 TEXT Distance/Similarity Measures (IRIS.DAT) If and are vectors as defined above, their cosine similarity is: The relationship between cosine similarity and the angular distance which we discussed above... | {
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"openwebmath_score": 0.6583377122879028,
"t... |
Knowing this now...
6. Sep 18, 2011
### seniorhs9
Actually, I understand why $$3^x > 0$$ for all x.
But my question is on how $$y_1 = \frac{1}{2}(3 - \sqrt{9 + 4k})$$ goes with the above.
We don't know $$3 - \sqrt{9 + 4k} > 0$$
We only know $$\sqrt{9 + 4k} \geq 0$$?
7. Sep 18, 2011
### gb7nash
You're exactly r... | {
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"openwebmath_score": 0.7824686169624329,
"tag... |
python, beginner, python-2.x, adventure-game
def dead(why):
print why, " Game Over."
exit(0)
def start():
print """
You suddenly awake in a dark hallway.
Your head hurts and you have no idea
how you got here.
Once your eyes adjust, you see that
there are two doors. One looks like
... | {
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"tags": "python, beginner, python-2.x, adventure-game",
"url": null
} |
java, design-patterns
The goal of a builder class is to hide all/most the object creation logic, which may involve filling defaults, defining buffers etc, from the client.
So, how do you use this builder?
Part of a useful builder is the ability to either tell the builder, or another related object that the builder acc... | {
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"tags": "java, design-patterns",
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} |
thermodynamics, entropy, oscillators, information, harmonics
Anybody know the relation between harmonic oscillations and entropy?
The field of neurodynamics studies the computational function of oscillating rhythms in the brain. As an example, here is an article that describes how neural systems communicate through p... | {
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"tags": "thermodynamics, entropy, oscillators, information, harmonics",
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c#, extension-methods, observer-pattern, system.reactive
because of the not clear intention I had a hard time understanding this short code. The descriptions says something else then the implementation.
Zip
I don't know any extension that could do the same job but I think this one could be expressed cleaner by first ... | {
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reference-request, pl.programming-languages, dependent-type, parametricity
Does anyone know a reference for the fact that parametricity allows defining projective eliminations for dependent types?
EDIT: The closest thing I've found so far is this 2001 paper by Herman Geuvers, Induction is not derivable in second order... | {
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"ur... |
python, interview-questions
I put a rough description of the problem in the docstring, and present it together with my solution:
def solution(movies, K, L):
"""
Given two integers K and L, and a list movies where the value at the ith index
represents the number of movies showing on the (i + 1)th day at th... | {
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“I can't wait to get my money! I already know what I'll be doing with it!”
Alice turned to Bob and asked:
“How can you be so sure that you are the one netting the prize?”
Bob smirked and returned:
“I guess you haven't been paying attention, Alice! In 2020 I was the realtor with the highest average commission over t... | {
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"openwebmath_score": 0.9905784726142883,
"tags": n... |
particle-physics, electrons, standard-model, electroweak, chirality
My strong urge is to suspend speculation of beyond-the-SM worlds unless a full admiring appreciation of the perfect-fitting-puzzle nature of the SM were achieved, fitting together tons of low (ours) energy data. To answer the question, then, the right... | {
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3. ## Re: Techniques of integration: Trigonometric substitution
I have solved the answer. I used the double-angle trig' identity: $sin^3(x)cos^3(x) \equiv \frac{1}{8}sin^3(2x)$
Oh is it. I used $F(x)$ so "something" equates to "something", instead of starting with "the integral of".
Anyway, why didn't a change-of-va... | {
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"tag... |
php, optimization, algorithm
$thumb_image = imagecreatetruecolor(90,90);
imagecopy($thumb_image, $image_t, 0, 0, $left, $top,
$thumb_width,$thumb_height);
imagejpeg($thumb_image, 'thumb.jpg', 80);
imagedestroy($thumb_image);
imagedestroy($dest_image);
imagedestroy($image_t); | {
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negative sign because I want to find outliers with low discount.
Is this approach meaningful to do? or is there any further proven way to achieve this?
• I guess this rather belongs on math.stackexchange.com or stats.stackexchange.com unless you have a question about the software Mathematica. – Yves Klett Apr 30 '16 ... | {
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"openwebmath_score": 0.24485890567302704,
"ta... |
ros-melodic, rosbag, ros-lunar
It is mandatory that the bag header
TimeStamp to be in order?
Can the std_msgs/Header.stamp to be
out of order and decoupled from bag
header TimeStamp?
In general, who is usually responsible of handling out of order messages? the software writing the bag files, or the clients reading t... | {
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"tags": "ros-melodic, rosbag, ros-lunar",
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} |
quantum-mechanics, fermions, bosons, identical-particles
Title: Two-body problem with identical particles In the two body problem we have two particles interacting via a potential $V(| r_1 - r_2 |)$:
$$ H = \frac{p_1^2}{2m_1} + \frac{p_2^2}{2m_2} + V(|r_1 - r_2|) \, .$$
It is well known that, with a canonical transfor... | {
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data-structures, red-black-trees
Whenever there is an else clause. The first statement of that else clause will be on the same line as the else clause. This can be a variable assignment, an if-statement or other things.
If that was too abstract, the code from question should be interpreted as follows:
RB-INSERT-FIXUP... | {
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//heading
Console.Write("* | ");
for ( int i = 0; i < 7; i++) { //column headings
Console.Write(i + " ");
}
Console.WriteLine();
Console.WriteLine(StringOfReps("-", 1 + (7+1)*(1+1)));
for (int r = 0; r < 7; r++) { // table body
Console.Write(r + " | "); // row heading
for (int c = 0; c < 7; c++) { // data ... | {
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"openwebmath_score": 0.3354646563529968,
"tags": null,... |
beginner, matlab, octave
% wrapping the sim_ind
ind = mod(sim_ind, uniq);
% mod maps all multiples of the largest index to zero
if ind == 0
ind = uniq;
end
% retrieving a parameter set
up_down_ratio = parameters(ind,1);
traffic_load = parameters(ind,2);
blocked_modes_ind = parameters(ind,3);
traffic_model = para... | {
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$\Box$
### Definition 2 implies Definition 1
Let $M = \struct{A, d}$ be a metric space such that $T$ is homeomorphic to $\struct{A,\tau_d}$ where $\tau_d$ is the topology induced by $d$.
Let $\phi : \struct{S, \tau} \to \struct{A, \tau_d}$ be a homeomorphism.
Let $d_\phi : S \times S \to \R_{\ge 0}$ be the mapping ... | {
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"openwebmath_score": 0.9770812392234802,
"tags": n... |
mathematical-physics
Now, in orthogonal bases $\vec{e}_{\mu}$ scale factors are defined as $h_{\mu}=\sqrt{\vec{e}_{\mu}\cdot \vec{e}_{\mu}}$ (which has some physical meaning if one thinks about decomposing a vector in such a basis), here summation is not implied. In cartesians, therefore, $h_1=1$, whereas in ellispoid... | {
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# Addition is to Integration as Multiplication is to ______
Addition is to Integration as Multiplication is to ______ ? Everyone knows that definite integration is "a way to sum continuum-many terms" in a rough sense. Can we "multiply continuum-many factors" in a similar sense?
• How about $e^{\int f}$? – ajotatxe Ju... | {
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"openwebmath_perplexity": 559.1576128451949,
"openwebmath_score": 0.924746036529541,
"tags"... |
newtonian-mechanics, forces, vectors, projectile, drag
Title: Some subtleties in direction of drag force Consider a body released from a height $h$ and assume a drag force is linearly proportional to the velocity. Then by Newton's Second Law, $$m\mathbf{\dot{v}} = \mathbf{F_g} + \mathbf{F_{drag}} = m\mathbf{g} -\mu \... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, forces, vectors, projectile, drag",
"url": null
} |
c++
I always hear that preprocessor macros are dirty and should not be used in C++, and I agree to some degree. However I could not realize what I wanted using templates.
So what do you think?
Is the use of preprocessor macros justified here?
Is the code safe?
Any improvements you can think of? I certainly sympathize... | {
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CONDITION :
$u(x,0)=x=\frac{1}{-0+F(e^0-x)}=\frac{1}{F(1-x)}$
$F(1-x)=\frac{1}{x}$
Let $\quad X=1-x\quad;\quad x=1-X\quad;\quad F(X)=\frac{1}{1-X}$
So, the function $F$ is determined.
We put it into the above general solution where $\quad X=e^y-x\quad$ then $\quad F(e^y-x)=\frac{1}{1-(e^y-x)}$
$$u(x,y)=\frac{1}{-... | {
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"lm_q2_score": 0.8652240895276222,
"openwebmath_perplexity": 145.70805586819526,
"openwebmath_score": 0.940077543258667,
"tag... |
fft, python, autocorrelation, conjugate
When I tried to confirm that equation (1) was working in python I found that the result is shifted by one sample. Here's the example code:
import numpy as np
from numpy.fft import rfft, irfft
x = np.arange(128)
y = np.sin(2 * np.pi * x / 128 * 4 + np.pi / 3)
y_rev = y[::-1]
y_re... | {
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"tags": "fft, python, autocorrelation, conjugate",
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} |
optimization, integer-programming, mathematical-programming
Many NP-hard problems can be modeled as an integer program, we take 3SAT for an example. Suppose we are given a 3SAT instance with clauses $C_i$ and variables $v$. For each clause, denote the variables that appear positive by $C_i^+$ and the variables that ap... | {
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"tags": "optimization, integer-programming, mathematical-programming",
"url": null
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linux, assembly, base64, byte
and r9b, 0xF
shl r9b, 2
mov r8b, r10b
shr r8b, 6
and r8b, 0x3
add r9b, r8b
And again the same redundancy with shifting and anding r8b. Consolidating both and's gives:
shl r9b, 2
mov r8b, r10b
shr r8b, 6
add r9b, r8b
and r9b, 0x3F
jmp .weHaveFinished
;--------
.weHaveFinished:
The code ... | {
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"tags": "linux, assembly, base64, byte",
"url": null
} |
ros-kinetic, rosjava, android
Hi @ByteMonster,
To publish messages, you need to create and execute a node. Within the context of the node execution, you can get a publisher and start doing what you want. I'd definitely not go the way of Java sockets in this case; you can use RosJava.
I've created a minimal example app... | {
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"tags": "ros-kinetic, rosjava, android",
"url": null
} |
general-biology, habitat
Title: How does life change when you dig deeper? I've just realized that I have no idea what life / biotopes / soil looks like when you dig deeper than a few meters.
I know that in the first meter of soil you can find all sorts of live animals (like moles and rabbits), insects (like ants, but ... | {
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"openwebmath_score": null,
"tags": "general-biology, habitat",
"url": null
} |
signal-detection, ultrasound
I then got an Audacity plug-in to allow me to do a band-stop filter. I found that when I took a recording of someone saying the wake word, and ran the plug-in centered on 5200hz at “Half an Octave.” (Beware, Dual monitor picture) My echo would not wake, even sitting right next to the speak... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "signal-detection, ultrasound",
"url": null
} |
classical-mechanics, lagrangian-formalism, coordinate-systems, differentiation, calculus
So in the real mathematical world, the symbols do not mean anything intrinsically and some function $f$ just maps a tuple of $N$ real numbers, called arguments, to some other real number. The notion of partial derivative would be ... | {
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"tags": "classical-mechanics, lagrangian-formalism, coordinate-systems, differentiation, ca... |
javascript, performance, algorithm, tic-tac-toe
}
if(grid[0].innerText==symToCompare&&grid[4].innerText==symToCompare&&grid[8].innerText==symToCompare){
winFlag=true;
if(confirm(whoseTurn+" wins. Play Again??"))
gameReset();
}
if(grid[2].innerText==symToCompare&&grid[4].innerText==symToCompare&&... | {
"domain": "codereview.stackexchange",
"id": 20141,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, performance, algorithm, tic-tac-toe",
"url": null
} |
earth, sun, moon, distance
Title: Moon vs Sun size and distance 400 times I have seen below statement, and it doesn't sound right:
The Sun and Moon seem to have the same size because of this amazing coincidence:
the moon is 400 times smaller than the Sun and 400 closer than the Sun.
Checking 400 from this source:
... | {
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"tags": "earth, sun, moon, distance",
"url": null
} |
quantum-mechanics, quantum-entanglement, measurements
Title: How does measurement work in this Multi qbit entangled system? Given a 4 qbit entangled state: $C_1= 1/2 (|0000\rangle+|1100\rangle+|0011\rangle-|1111\rangle)$.
Assuming we take one particle, and measure them it in the basis: $1/\sqrt2(|0\rangle+|1\rangle)$,... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-entanglement, measurements",
"url": null
} |
cosmology, coordinate, units
shows, in my opinion, a common misinterpretation of the use of $h$: The factor $h$ is not a part of the unit of some number; rather it should just be thought of as a number that is multiplied on the quantity. So, although the result is the same, I think it's better to write, say,
$$
d = 23... | {
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"tags": "cosmology, coordinate, units",
"url": null
} |
ros, c++, icp, rosbag, pcl
}
int main (int argc, char** argv) {
// Initialize ROS
ros::init (argc, argv, "my_script");
ros::NodeHandle n( "~" );
// Create ROS subscriber for fixed_frame topic
ros::Subscriber sub = n.subscribe(
"/sr/pointcloud2/raw",
1,
... | {
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"tags": "ros, c++, icp, rosbag, pcl",
"url": null
} |
• Thanks, that makes sense! – Boris Grunwald Nov 19 '18 at 21:46
You went wrong when you thought what Maple wrote is different from your solution in any significant way.
Maple has swapped the roles of $$c_1$$ and $$c_2$$ compared to you. And Maple's $$c_1$$ is seven times larger than your $$c_2$$ and has opposite sig... | {
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"lm_q2_score": 0.8376199572530448,
"openwebmath_perplexity": 164.10883159189171,
"openwebmath_score": 0.8955401182174683,
"ta... |
ros, ros2, msg
I would say "no".
One of the main points of using standardised messages as we do in ROS is that they allow you to encode both syntax (ie: the exact form of data (layout, sizes of fields, etc)) and the semantics (ie: the meaning (so x is the first element of a vector that has its origin at frame_id)) in ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, ros2, msg",
"url": null
} |
general-relativity, black-holes, time, coordinate-systems, observers
Title: In general relativity (GR), does time stop at the event horizon or in the central singularity of a black hole? I was reading through this question on time and big bang, and @John Rennie's answer surprised me.
In the immediate environment of a... | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "general-relativity, black-holes, time, coordinate-systems, observers",
"url": nu... |
thermodynamics, temperature, entropy
water has a higher specific heat than air
water has a higher thermal conductivity than air
The higher specific heat means that for every 1 degree drop in temperature water delivers more heat to the chicken than air does, and the higher thermal conductivity means water delivers tha... | {
"domain": "physics.stackexchange",
"id": 41663,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, temperature, entropy",
"url": null
} |
python, performance, python-2.x, iterator, iteration
Want the best schedules? n
Are you feeling lucky??? (Do you want to only create one schedule) n
Would you like to limit the number of schedules made? 6
Time to calculate and store all possible true schedules: 24.3771910667 *
True Schedules: 1429
Possibilities: ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, python-2.x, iterator, iteration",
"url": null
} |
electrostatics, charge, gauss-law
Title: 1 charge at the center and many uniformly distributed on the surface of a perfect ideal conducting solid sphere Suppose there is a perfect ideal conducting solid sphere. Suppose somehow a charge of $+Q$ is kept exactly at the center of the sphere and its surface is also given a... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electrostatics, charge, gauss-law",
"url": null
} |
physical-chemistry, solubility
Title: Solubility in different pressure conditions I am working on my scholarship exam practice. I believe this exam assumes high school + first year university knowledge. And I'm not quite sure what I did wrong. Could you please have a look?
The solubility of oxygen in 1.0 L water is 2... | {
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"openwebmath_score": null,
"tags": "physical-chemistry, solubility",
"url": null
} |
electrostatics, electric-fields, gauss-law, conductors
Then it is the only possible electric field for $\mathcal{V}$, and no 'other' solution of electric field will satisfy these two conditions.
The difference between this and the previous statement is that, the latter one is more general as for example, there can be ... | {
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"openwebmath_score": null,
"tags": "electrostatics, electric-fields, gauss-law, conductors",
"url": null
} |
electromagnetism, vectors, coordinate-systems, covariance
$$\vec{a} \times \vec{b} = \hat{r}(a_2b_3 - b_2 a_3) - \hat{\theta}(a_1b_3 - b_1 a_3) + \hat{z}(a_1b_2 - b_1 a_2),$$
where the $a_i$ and $b_i$ are the components of $\vec{a}$ and $\vec{b}$ in cylindrical coordinates this time. This is something you can try to u... | {
"domain": "physics.stackexchange",
"id": 38075,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, vectors, coordinate-systems, covariance",
"url": null
} |
quantum-mechanics
What I am saying is that since we do not know the spectrum of the claimed approximated momentum we cannot say how (if) this claimed approximation works as soon as $\delta \to 0$.
It is possible to prove that if the domain is chosen as $C_0^\infty(\mathbb R)$ or ${\cal S}(\mathbb R)$ then there is a u... | {
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"tags": "quantum-mechanics",
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} |
# An urn contains 100 marbles: 20 white, 30 red, 50 green. Calculate the probability of selecting White, Red and Green marbles respectively. What is the probability of pulling a white, green, white and red marbles consecutively?
Apr 18, 2016
$\frac{950}{156849}$ or approximately 0.6%
#### Explanation:
Assuming the ... | {
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"lm_q2_score": 0.8688267898240861,
"openwebmath_perplexity": 1224.7511290063478,
"openwebmath_score": 0.8504791855812073,
"tags": n... |
optics, waves, diffraction
For the $m^{\rm th}$ order the basic diffraction grating equation is $m\lambda = d \sin \theta_{\rm m}$ where $d$ is the distance between adjacent slits and the path difference between adjacent slits is $m\lambda$.
In my diagram the path difference between the slit labelled $A$ and that ... | {
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"openwebmath_score": null,
"tags": "optics, waves, diffraction",
"url": null
} |
$x \approx - 1.2 + n \pi , n = 0 , \pm 1 , \pm 2 , ....$
We now need to select values for the integer $n$ such that the solutions are in the interval $[0 , 2\pi )$.
$n = 1$ gives the solution $x \approx - 1.2 + \pi = 1.94$
$n = 2$ gives the solution $x \approx - 1.2 + 2\pi = 5.08$
The graphical solutions of the equatio... | {
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"lm_q2_score": 0.8244619285331332,
"openwebmath_perplexity": 159.38365342600483,
"openwebmath_score": 0.909301221370697,
"tags"... |
python, html, python-2.x, sqlite, geospatial
conn.close()
I’ll let you fill in the blanks based on your current code. But a few things to notice:
close your resources: conn.close() was missing in your code, wraps open (or codecs.open) in a with clause.
you conn.commit() but in case something went wrong, you want to ... | {
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"tags": "python, html, python-2.x, sqlite, geospatial",
"url": null
} |
must also be equal and value... Equiangular, then it is the same as an equiangular triangle, the ABC triangle that has three equal,! Third of that, or 60° three formulas assuming the lengths of the lengths of sides... Question Answers Found is circle a polygon are the same length ),. \Cdot a$ $a$, we can determine that... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9740426382811477,
"lm_q1q2_score": 0.833635505586662,
"lm_q2_score": 0.855851143290548,
"openwebmath_perplexity": 617.1348247932343,
"openwebmath_score": 0.5857572555541992,
"tags": n... |
navigation, simulation, rviz, stage, stageros
Original comments
Comment by JSantos on 2012-12-09:
Thanks! I'm fascinated with your work, it's very interesting. However I have a few questions. I have implemented this package with teleoperation in a robotic platform which has a Hokuyo URG-04LX-UG01 Laser Rangefinder wit... | {
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"tags": "navigation, simulation, rviz, stage, stageros",
"url": null
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human-biology, reproduction
How is it even possible?
Immune tolerance in pregnancy or gestational/maternal immune tolerance
The placenta functions as an immunological barrier between the mother and the fetus, creating an immunologically privileged site. For this purpose, it uses several mechanisms | {
"domain": "biology.stackexchange",
"id": 6767,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "human-biology, reproduction",
"url": null
} |
java, game
private List<Card> cards;
private Card selectedCard;
private Card c1;
private Card c2;
private Timer t;
public Board(){
int pairs = 10;
List<Card> cardsList = new ArrayList<Card>();
List<Integer> cardVals = new ArrayList<Integer>();
for (int i = 0; i < ... | {
"domain": "codereview.stackexchange",
"id": 12866,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, game",
"url": null
} |
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