text stringlengths 1 1.11k | source dict |
|---|---|
rosdep
executing command [sudo -H apt-get install -y ros-noetic-map-msgs]
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package ros-noetic-map-msgs
executing command [sudo -H apt-get install -y ros-noetic-diagnostic-updater]
Reading package lists...... | {
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#1
+91049
+2
I have labeled the points T, X and R as shown in my diagram.
I have also let $$\angle DPX =\alpha$$ $$\;\;and\;\;\angle AQX=\beta\;\;and \;\;\angle ADC=\theta$$
Now:
$$\angle DPX\cong \angle CPX= \alpha \qquad \qquad \overline{PX}\;\;bisects \angle DPC\\ \angle AQX\cong \angle DQX= \beta \qquad \qqu... | {
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"lm_q2_score": 0.8175744761936437,
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"openwebmath_score": 0.8284313678741455,
"tags":... |
design of how much space it occupies and is defined numerically. But, the diameter is given, that is 6 in. Volume of Hollow Cylinder. The hollow cylinder, also called the cylindrical shell, is a three-dimensional region bounded by two right circular cylinders having the same axis and two parallel annular bases perpendi... | {
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"lm_q1_score": 0.983596967483837,
"lm_q1q2_score": 0.8064446031934304,
"lm_q2_score": 0.8198933403143929,
"openwebmath_perplexity": 351.0300848671814,
"openwebmath_score": 0.8166462779045105,
"tags": nu... |
javascript, homework
Title: Calculate function with optional operator argument I am currently learning javascript at university. We have an assignment where we shall write various functions for calculating values. In one case, we shall write a function which returns the sum of two values, if only those two values were... | {
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"openwebmath_score": null,
"tags": "javascript, homework",
"url": null
} |
thermodynamics, entropy
$$\delta Q=TdS=dU+pdV\\
C_vdT+\frac{RT}{V-nb}dV$$ or
$$dS=\frac{C_v}{T}dT+\frac{nR}{V-nb}dV$$ and
$$S-S_0=\int_{T_0}^T\frac{C_v}{T}dT+nR\int_{T_0}^T\frac{1}{V-nb}dV$$and
$$S(T,V)=S_0+\int_{T_0}^T\frac{C_v(T)}{T}dT+nR \rm{ln} \left( \frac {V-nb}{V_0-nb} \right) $$ | {
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"openwebmath_score": null,
"tags": "thermodynamics, entropy",
"url": null
} |
c++, c++11, thread-safety, collections, lock-free
//lock free
template<class... U>
iterator emplace_after(const_iterator position, U&&... params) {
return insert_node(position, new node(std::forward(params)...));
}
//lock free
template<class... U>
iterator emplace_after_ordered(const_i... | {
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"url": null
} |
homework-and-exercises, electric-circuits, electrical-resistance, batteries
Title: Can I arbitrarily pick which resistors I should calculate the equivalent resistance with? Let's say I have some random complex circuit of resistors. Maybe something like:
Now I wanna calculate the equivalent resistance of this whole ci... | {
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"tags": "homework-and-exercises, electric-circuits, electrical-resistance, batteries",
"u... |
vba, windows, active-directory, adodb
Public Property Get DomainName() As String
DomainName = this.DomainName
End Property
Public Property Get MachineName() As String
MachineName = this.MachineName
End Property
Public Property Get WindowsVerion() As String
WindowsVerion = this.WindowsVerion
End Property
... | {
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"openwebmath_score": null,
"tags": "vba, windows, active-directory, adodb",
"url": null
} |
ros-kinetic
Title: Creating pointers in rosmsg
Hey,
I want to know that, can I create pointers in ros messages as we do in simple c++. I want to create a structure for a property of a node.
struct proper_int{
string title;
int value;
**proper_int *next;**
};
can i do this in a rosmsg or any way to do thi... | {
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"tags": "ros-kinetic",
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} |
jupiter, gas-giants, degenerate-matter
Title: What would happen to a gas planet if its core mass goes beyond the Chandrasekhar limit? Hypothetically, let's say we had a gas giant that continued to accrete mass. I've heard that the cores of gas giants are electron degenerate. So if the planet continued to accrete mass ... | {
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"tags": "jupiter, gas-giants, degenerate-matter",
"url": null
} |
javascript, performance, functional-programming
Code output:
{
"type1": [
{
"name": "First item",
"types": [
{
"value": "type1"
},
{
"value": "type2"
}
]
},
... | {
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"openwebmath_score": null,
"tags": "javascript, performance, functional-programming",
"url": null
} |
homework-and-exercises, electromagnetism, electricity, electric-fields
I'm not looking for an actual solution to this problem, I just need help understanding the wording of the question and making sure I know how to begin this problem. Below is my current understanding of the question and approach for tackling this pr... | {
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"url": ... |
c#, algorithm, .net, array
If I understand this correctly, your code doesn't work. This is because when some characters match and then you find a character that doesn't match, you can't continue checking with the current character, you need to go back to the second character of the current partial match.
An example is... | {
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"url": null
} |
optics, interference
\phi_2 - \phi_1 = \Delta \phi =& 2(kz_0 - \psi(z_0)) - \pi - 2\pi n\\
\Delta \phi = 2kz_0 - 2\psi(z_0) - \pi - 2\pi n&
\end{align}
The OP defines $\Delta z = 2z_0$ so that
$$
\Delta \phi = k\Delta z - 2\psi \left(\frac{\Delta z}{2}\right) - \pi - 2\pi n
$$
This agrees with the expression the OP gi... | {
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} |
c#, beginner, object-oriented, json
I've created a Visual Studio solution with two projects:
IvManager.ConsoleApp - The presentation part.
IvManager.Business - Library containing the business logic.
Inside of IvManager.Business I have three classes:
Product - The product object that I have to manage.
Inventory - Thi... | {
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powershell
}
}
Function CreateLocal {
foreach ($computer in $servers) { | {
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"tags": "powershell",
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ros
Originally posted by jossy with karma: 83 on 2014-09-27
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by jbohren on 2014-09-28:
Ah that's nice, they didn't use to have that tutorial on the xenomai site. Also, if you run into other issues, I've got a bunch of additional note... | {
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ros, sbpl
I guess this is not expected behavior, any idea on why ?
I work on ubuntu 12.04 with ROS fuerte.
Best regards,
Guido
Originally posted by Guido on ROS Answers with karma: 514 on 2013-07-01
Post score: 0
From the path above, I can tell that you installed the sbpl_arm_planner as part of the full-body-nav pro... | {
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} |
python, performance, numpy, simulation, numba
"""
self.df_county_data['CountyName'] = self.pd_shapefile.NAMELSAD
self.df_county_data['MajorityPop'] = \
self.pd_shapefile.geometry.apply(lambda x: \
self._get_number_by_county(x)[0])
self.df_county_data['MinorityPop'] =... | {
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} |
java, mysql
Title: Client for handlersocket server I wrote a simple client for handlersocket server, but I'm not a professional Java programmer and would like to know the opinion of Java developers on my code.
Well I have not yet decided how to implement a class HSResult.
My project is here
HSResult store initial quer... | {
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"tags": "java, mysql",
"url": null
} |
general-relativity, black-holes, time-dilation, event-horizon, observers
counting how many times a beam of light has reflected on a pair of mirrors, or if you are measuring time with your heartbeat, or if you are clapping in regular intervals, or if you are repeatedly listening to your favorite song and counting how m... | {
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"tags": "general-relativity, black-holes, time-dilation, event-horizon, observers",
"url"... |
ros, rviz, ubuntu, ubuntu-precise, dae
More accurate inertial can be from the CAD software itself.
Also, often the mesh (*.dae or *.stl ) from CAD software will be in millimeters. So you might also need to scale the dimensions by 0.001 this way
Originally posted by avcx with karma: 26 on 2017-11-28
This answer was AC... | {
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"tags": "ros, rviz, ubuntu, ubuntu-precise, dae",
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Create the grid vectors, x, y, and z. These vectors define the points associated with values in V.
x = 1:100;
y = (1:50)';
z = 1:30;
Define the sample values to be a 50-by-100-by-30 random number array, V. Use the gallery function to create the array.
V = gallery('uniformdata',50,100,30,0);
Evaluate V at three poin... | {
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"openwebmath_perplexity": 1769.7208819661869,
"openwebmath_score": 0.5728554725646973,
"tags": n... |
python, pandas
for row in df.itertuples():
# artists[-1] in an empty list will raise IndexError:
try:
# Checking if current artist is the same as the last appended
if artists[-1] == row.Artist:
count += 1
artists.append(row.Artist)
... | {
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java, unit-testing, binary-search
return -1;
}
}
public class BinarySearchTest {
private BinarySearch binarySearchCUT;
private static final int UNSUCCESSFUL = -1;
@Before
public void setUp(){
binarySearchCUT = new BinarySearch();
}
@Test
public void testShouldReturnUnsuccess... | {
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programming, ibm-q-experience, simulation, teleportation, entanglement-swapping
//measuring q1 and q2
//for controlled gates
measure q[2] -> c[0];
measure q[1] -> c[1];
//set q1 and q2 to |0> to
//emulate they are not measured
reset q[1];
reset q[2];
//controlled gates
//q1 = |0>, q2 =|1>
if (c==1) x q[3];
//q1... | {
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java, game, community-challenge, pathfinding
private static boolean isNearWall(final Track track, final PathNode node) {
PathNode[] neighbors = getNeighbors(node);
for (PathNode neighbor : neighbors) {
if (track.getSpace(neighbor.getPosition()) == Track.SpaceType.WALL) {
ret... | {
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"url": null
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gazebo
Title: List all joints existing in Gazebo
How to see what joints are existing during a simulation? Just to be sure that my dynamically spawned joints are actually there.
Originally posted by mehdi on Gazebo Answers with karma: 94 on 2015-06-29
Post score: 0
Original comments
Comment by djou07 on 2015-06-29:
... | {
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} |
algorithms, graphs, shortest-path, correctness-proof, weighted-graphs
D(t, 2i) = D(v, 2i-1) + w(v,t) = D(v, 2i) + w(v,t) \ge d(v) + w(v,t).
$$
Therefore, after $(v,t)$ is examined, we must have $d(t) \le D(t, 2i)$. This proves (ii) and concludes the proof by induction.
At this point we just need to notice that, the ab... | {
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} |
c++, matrix, mathematics, c++17
Title: Writing a C++ Matrix class I am refreshing my C++ programming skills, and I'm currently reading the book C++ 17 by Ivor Horton. The idea is to code some naive implementations of numerical algorithms (Root finding, solving a system of linear equations). To hone my skills, I decide... | {
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she is able to contacl three radio beacons. which give approximate mileage from her position to each beacon. She quickly records the following information: 700 miles from Athens. 1300 miles from Rome, and 900 miles from Sophia. Determine the agent's approximate location. Explain your procedure. 5. The exercises dealing... | {
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"lm_q2_score": 0.8267117876664789,
"openwebmath_perplexity": 4465.94787859596,
"openwebmath_score": 0.8407867550849915,
"tags": null,
... |
# Generalizing the trick for integrating $\int_{-\infty}^\infty e^{-x^2}dx$?
There is a well-known trick for integrating $\int_{-\infty}^\infty e^{-x^2}dx$, which is to write it as $\sqrt{\int_{-\infty}^\infty e^{-x^2}dx\int_{-\infty}^\infty e^{-y^2}dy}$, which can then be reexpressed in polar coordinates as an easy i... | {
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"lm_q1q2_score": 0.832438641046337,
"lm_q2_score": 0.8652240791017535,
"openwebmath_perplexity": 211.42197191760366,
"openwebmath_score": 0.9611168503761292,
"tag... |
Is that the same as a combination1? No! 123 and 321 are different sequences of three numbers, but they denote the same combination, right?
So you've counted the number of ways to punch in three digits. (504)
How many different ways is there to punch in each individual combination?
Once you know that, you can divide t... | {
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"lm_q1q2_score": 0.8239191445058056,
"lm_q2_score": 0.8397339656668287,
"openwebmath_perplexity": 802.7666227215674,
"openwebmath_score": 0.5021070241928101,
... |
python, file-system
Surround top-level function and class definitions with two blank
lines.
Limit all lines to a maximum of 79 characters. For flowing long blocks
of text with fewer structural restrictions (docstrings or comments),
the line length should be limited to 72 characters.
Function names should b... | {
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"tags": "python, file-system",
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clustering, k-means
Should the lone centroid remain unmoved?
Should I move that centroid? If yes, how?
Should I remove it?
Is there a standard way to deal with this?
------------ EDIT: --------------
On Github, I found this:
https://github.com/klebenowm/cs540/blob/master/hw1/KMeans.java
This suggests that if a centro... | {
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"url": null
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EDIT 3. Here is a generalization.
Let $T$ be an $n$ by $n$ complex matrix, and $$p(X)=(X-\lambda_1)^{m(1)}\cdots(X-\lambda_k)^{m(k)}$$ its minimal polynomial (the $\lambda_i$ being distinct and the $m(i)$ positive). Let $A$ be the algebra of those functions $f(z)$ which are holomorphic in a neighborhood of the spectru... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9653811571768047,
"lm_q1q2_score": 0.8487117344454347,
"lm_q2_score": 0.8791467785920306,
"openwebmath_perplexity": 202.73818572443764,
"openwebmath_score": 0.9421183466911316,
"ta... |
b$ and $b\mid a$. Then $a=ub$ for some unit $u\in R$. * **Definition**: Let $R$ be commutative and unital and let $a,b\in R$. If there exists a unit $u\in R$ such that $a=ub$, then $a$ and $b$ are *associates*. * **Lemma 3.7.3**: Let $R$ be Euclidean and let $a,b\in R$. If $b\ne 0$ is not a unit, then $d(a)<d(ab)$. * *... | {
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"tags": ... |
c
Doing this will result in the order of the digits to be reversed. You already implemented popping the last digit from a number, now try to implement the reverse operation of pushing something to the back of a number, without having to know the exact length of that number.
About input validation
I wonder why you don'... | {
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Chapter 16. If F 1 = 1 N, x 1 = 1 m, F 2 = 2 N and x Trapezoid (a two-dimensional figure) is a quadrilateral that has a pair of parallel opposite sides. Consider the following trapezium in which. The center of gravity of a trapezoid can be estimated by dividing the trapezoid in two triangles. The center of gravity is t... | {
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"tags": ... |
### Transforming convolution to computation graph
In order to calculate partial derivatives of every nodes inputs and parameters, it's easier to transform the operation to a computational graph. Here I'm going to transform the previous 1D convolution, but this can be extended to 2D convolution as well.
Here our graph... | {
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"openwebmath_score": 0.5597177743911743,
"tags": nu... |
Claim: $2015\cdot 10^{2k+4}<(4489\cdot 10^k + 2015)^2 <2016\cdot 10^{2k+4}$ for all $k\geq 4$
You have: $(4489\cdot 10^k + 2015)^2 = 4489^2\cdot 10^{2k} + 2\cdot 2015\cdot 4489\cdot 10^k + 2015^2$
Trivially $2015\cdot 10^{2k+4} = 20150000\cdot 10^{2k} < 20151129\cdot 10^{2k} = 4489^2\cdot 10^{2k} < (4489\cdot 10^k+20... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9653811611608242,
"lm_q1q2_score": 0.8002419113484229,
"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 468.4061518725561,
"openwebmath_score": 0.7698072195053101,
"tag... |
javascript, performance, interview-questions, memory-optimization
var memoryUse = 0;
var min = Infinity;
var max = 0;
const cycles = 10000;
const arraySize = 1000;
const maxRange = 10000;
for(let i = 0; i < cycles; i++){
const arr = [];
const range = Math.random() * maxRange | 0;
for(let i = 0; i < arraySize; i... | {
"domain": "codereview.stackexchange",
"id": 31857,
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"openwebmath_score": null,
"tags": "javascript, performance, interview-questions, memory-optimization",
"url": nu... |
A definition not involving power series, integrals, differential equations, or geometric intuition is:$$\cos x+\mathrm i\sin x=\lim_{n\rightarrow\infty}\left(1+\frac{\mathrm ix}{n}\right)^{\!n}\quad(x\in\Bbb R).$$ | {
"domain": "stackexchange.com",
"id": null,
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"openwebmath_perplexity": 611.3339714577285,
"openwebmath_score": 0.9376338124275208,
"tags... |
np-complete, reductions, np-hard, np, decision-problem
Title: Finding suitable NP-complete problem to reduce to my problem I've been given a set $S$ of natural numbers (non-negative integers) $s_1$, $s_2$,...,$s_n$ where $|S|=n$. My problem is to figure out if there is way to get a total sum of 0 when using all the nu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "np-complete, reductions, np-hard, np, decision-problem",
"url": null
} |
python, iterator, generator
Title: Filtering a long list of files through a set of ignore patterns using iterators I have a backup job that walks across a huge directory with potentially millions of files. Python's os.walk() works just fine.
Now, I have implemented a feature to ignore files based in a black list of pa... | {
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"id": 4903,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, iterator, generator",
"url": null
} |
the triangle to be equal. if a triangle is equilateral, then it is ___ isosceles. Answer:The size of the angle is 60°. Let each angle be a. Now let us combine them and understand the classification of triangles. Click here to get an answer to your question ️ Is it true to say that two equiangular triangles are always c... | {
"domain": "bestretirementcommunitiesusa.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9783846697584033,
"lm_q1q2_score": 0.8153120069609535,
"lm_q2_score": 0.8333245932423308,
"openwebmath_perplexity": 590.3558117314997,
"openwebmath_score": 0.65686... |
member of non-circular cross section, equilibrium of the element AB requires FA=FB t At A∆x =t bt b∆y (by using shear equivalent) q=τt=constant shear flow Analogy: (1) the distribution of shear stress τ in the transverse section of a thin-walled hollow shaft (2) the distribution of the velocities v in water flowing thr... | {
"domain": "laquintacolonna.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9865717452580315,
"lm_q1q2_score": 0.8133908373489247,
"lm_q2_score": 0.8244619220634456,
"openwebmath_perplexity": 1143.035002803819,
"openwebmath_score": 0.7363621592521667,
"ta... |
structural-engineering, buckling
Why isn't the lateral torsional critical moment of rectangular cross sections dependent on shear modulus $G$ or torsional stiffness? Are the two formulas even equivalent (does the specific formula for rectangular sections follow from the general one?) Bit late to the party, but there's... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "structural-engineering, buckling",
"url": null
} |
ros
Title: Atom + linter-clang
Trying to run linter-clang in Atom on some C++ files is running into trouble because it can't find the header files.
I notice that in Dirk's Atom Settings that he plugged at ROSCon, there are many ROS header include folders listed manually as part of the settings for clangIncludePaths.
... | {
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"id": 27780,
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"tags": "ros",
"url": null
} |
algorithms, c++
If $|A[i] - A[min]|\ge |A[i] - A[max]| $, let $B[i] = min$, else $B[i] = max$.
If $A[i] < A[min]$, $min=i$.
If $A[i] > A[max]$, $max=i$.
Decrement $i$. If $i>0$, go to step 1., else stop. | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, c++",
"url": null
} |
navigation, robot-localization
Title: Robot localization and Landmarks
I am using the robot_localization package on a turtlebot running ROS Indigo. I would like the turtlebot to autonomously navigate a space and update it's position based on AprilTag landmarks. It seems that the way to do this is to take advantage of... | {
"domain": "robotics.stackexchange",
"id": 26821,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "navigation, robot-localization",
"url": null
} |
c++, object-oriented, state-machine
inline friend bool operator>(const AbstractImmutable<T> & a, const AbstractImmutable<T> & b) {
return a.getValue() > b.getValue();
}
inline friend bool operator==(const AbstractImmutable<T> & a, const AbstractImmutable<T> & b) {
return a.getV... | {
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"tags": "c++, object-oriented, state-machine",
"url": null
} |
ros, roswtf, transform
Title: Is there a robot monitor node?
I am looking for a node which can monitor the robots health
It should:
Monitor nodes, topics, tf frames, ...
Publish diagnostic_msgs messages
Have a configuration which describes the robot's system (like frames, nodes, etc.)
It might be similar to roswt... | {
"domain": "robotics.stackexchange",
"id": 25365,
"lm_label": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, roswtf, transform",
"url": null
} |
waves, resonance
The usual standing wave solutions are like $\sin(\pi n x /L) \sin(\pi n c t /L)$. Now given any other instantaneous potential that goes to zero at the boundary, we can find its time evolution by doing a fourier decomposition to write it as a sum of plane waves. Since we know how each of these plane wa... | {
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"id": 11931,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "waves, resonance",
"url": null
} |
tensorflow, cnn
Title: Error not decreasing in a 3 layer deep CNN using TensorFlow I'm trying to train a CNN to play an online game by feeding images of the game along with the keyboard input.
By playing the game for some time and collecting the data, I gathered 342 images with size 110x42. I'm feeding these images in... | {
"domain": "datascience.stackexchange",
"id": 3532,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "tensorflow, cnn",
"url": null
} |
ros, microcontroller, ros2, raspberrypi, module
I suppose I'm thinking of the way the Nvidia Jetson Nano development kit is used to develop software that is deployed onto a System on Module for production but something relevant to a small, inexpensive System on Chip.
Is this situation remotely realistic? I'm wondering... | {
"domain": "robotics.stackexchange",
"id": 34608,
"lm_label": null,
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"openwebmath_score": null,
"tags": "ros, microcontroller, ros2, raspberrypi, module",
"url": null
} |
homework-and-exercises, gravity, projectile
Title: related to projectile motion I was given this worksheet from my teacher and well im finding it really tough so far ..
the question below is just crushing my skull .. so i would appreciate it if you guys would guide me through it
A particle projected from ground takes... | {
"domain": "physics.stackexchange",
"id": 15680,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, gravity, projectile",
"url": null
} |
biochemistry, biophysics, protein-structure, protein-folding, prion
In any case, "amyloid" is a structural property whereas "prion" is a functional property and they cannot be considered a sub/superset of one another, even if they happen to be correlated.
The bottomline is:
Amyloid is a form of supramolecular protei... | {
"domain": "biology.stackexchange",
"id": 9530,
"lm_label": null,
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"tags": "biochemistry, biophysics, protein-structure, protein-folding, prion",
"url": null... |
is continuous at a can., does n't exist, or ; f ( x ) = e x x! Brief introduction and theory accompanied by original problems and others modified from existing literature these topics are taught MATH108... It is continuous at x = a if the following e x tan x equipment Check 1: following... Domain is all real numbers a ... | {
"domain": "finmining.com",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9854964237163882,
"lm_q1q2_score": 0.8296161588929842,
"lm_q2_score": 0.8418256412990657,
"openwebmath_perplexity": 370.99490256389913,
"openwebmath_score": 0.7967192530632019,
"ta... |
ds.algorithms, np-hardness, approximation-algorithms, optimization
Note that if a given $f_i$ is initially non-decreasing, then so is the new $f_i'$, while the rest of condition (i) holds for $f_i'$.
To satisfy condition (iii), it suffices to make $A$ large enough. This follows from thinking geometrically about what c... | {
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"openwebmath_score": null,
"tags": "ds.algorithms, np-hardness, approximation-algorithms, optimization",
"url": null... |
quantum-mechanics, probability, perturbation-theory, fermis-golden-rule
The perturbation theory always becomes inadequate when the perturbation, in this case the matrix element $\langle f |V|i\rangle$, is too large. But one must properly understand what "too large" means. And it means $P_{f\leftarrow i} \geq O(1)$ whi... | {
"domain": "physics.stackexchange",
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"tags": "quantum-mechanics, probability, perturbation-theory, fermis-golden-rule",
"url": ... |
neural-network, deep-learning
Residual networks: Researchers have been able to train incredibly deep networks (more than 1000 layers!) using residual networks. The idea here is that each layer receives not only the output from the previous layer, but also the original input as well. If trained properly, this encoura... | {
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"openwebmath_score": null,
"tags": "neural-network, deep-learning",
"url": null
} |
amateur-observing, jupiter, saturn, star-gazing
What kind of image I should expect from this telescope?
If my experience doesn't match expectations, what are some likely reasons?
1It's a 76 mm f/9.2 Newtonian reflector You can see some large details
With a 76mm scope and a decent eyepiece you should be able to see th... | {
"domain": "astronomy.stackexchange",
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"tags": "amateur-observing, jupiter, saturn, star-gazing",
"url": null
} |
Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations. Plotting a piecewise function. MathJax reference. These functions do not share the same point at x = 0, as the first contains that point (0, 3), while the second piece contains the point (0, 1). {-x... | {
"domain": "m-spitzer.de",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9759464422083111,
"lm_q1q2_score": 0.840815155525152,
"lm_q2_score": 0.8615382147637196,
"openwebmath_perplexity": 985.4630696164663,
"openwebmath_score": 0.3814734220504761,
"tags"... |
strings, formatting, vb.net
Title: Parse floats to a custom numeric format string I'm working to implement a custom string format. These are the float values to convert into a string:
1,02458
0,4145805
0,06231292
0,04362812
1,16458
1,172608
0,06011338
0,05324263
0,0653288
0,0285034
0,0992517
0,0861678
This is the out... | {
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"tags": "strings, formatting, vb.net",
"url": null
} |
c#, performance, multithreading, asp.net, entity-framework
Conclusion
I have a few concerns with if i am handling anonymous types and using the TPL (task parallel library) efficiently and with best practices in mind. Such as if i am using the right amount of Tasks?
I am not sure if i am going about this the right way ... | {
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"tags": "c#, performance, multithreading, asp.net, entity-framework",
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} |
condensed-matter, topology, topological-insulators
"The SSH model is in the class D": this means we allow all perturbations that respect $\mathcal C$, but they can break $\mathcal T$ and/or $\mathcal S$. One can show that one can now connect a model that has $\nu = 2$ to one that has $\nu =0$. In the class AIII we cou... | {
"domain": "physics.stackexchange",
"id": 49764,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "condensed-matter, topology, topological-insulators",
"url": null
} |
nlp, named-entity-recognition
Title: Extracting specific data from unstructured text - NER I have a reasonably simple problem to solve. I need to extract reservations numbers from unstructured text. Based on my research, it seems to be an NER problem. Based on a visual analysis of the dataset, I could notice that the ... | {
"domain": "datascience.stackexchange",
"id": 3713,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "nlp, named-entity-recognition",
"url": null
} |
spectroscopy, elements, rare-earth-elements, transuranic-elements
The studies include the location of energy levels, their hyperfine splittings and their lifetime. All of these levels are close to the ground state. The results show a remarkable agreement with calculated ab initio properties to a degree that is compara... | {
"domain": "chemistry.stackexchange",
"id": 16425,
"lm_label": null,
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"tags": "spectroscopy, elements, rare-earth-elements, transuranic-elements",
"url": nul... |
experimental-physics, string-theory, dimensional-analysis, quantum-gravity, order-of-magnitude
On the other hand, string theory is expected to have enough freedom to, depending on the 'exact choice of string theory' (this is known as the swampland), cover considerable regimes of physical quantities such that there pro... | {
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"id": 96188,
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"openwebmath_score": null,
"tags": "experimental-physics, string-theory, dimensional-analysis, quantum-gravity, order-... |
c++, beginner, embedded
Title: Simple dishwasher C++ code I have a project in embedded systems and I have to write the code in C, and make it simple.
This is my first time, and it's only a simulation of how it should work.
#include<iostream.h>
#include<stdio.h>
void manualMode();
void defaultMode();
int temp, timeT... | {
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"tags": "c++, beginner, embedded",
"url": null
} |
computational-physics, simulations
Title: Monte Carlo use Where is the Monte Carlo method used in physics? Monte Carlo is a particular numerical technique heavily used in Physics, mainly when one needs to "brute force" the calculation.
Virtually, all areas of Physics can make use of simulations that include some sort... | {
"domain": "physics.stackexchange",
"id": 38,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "computational-physics, simulations",
"url": null
} |
javascript, jquery, html
// Was: if (elId === lastImageIdClicked) {
// - just use elem.id here. It's not more complex and actually tells me more
if (elem.id === lastImageIdClicked) {
clicks++;
clearTimeout(timer);
}
// This whole else is irrelevant as you set [va... | {
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c++, c++11, reinventing-the-wheel
LincedList -> LinkedList
currectNode -> currentNode (and some variants)
Maybe English is not your native language, that's fine. There are some tools that can help you find and fix common spelling errors in source code, like codespell. Consider running them on your code from time to t... | {
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"tags": "c++, c++11, reinventing-the-wheel",
"url": null
} |
We can much more simply choose $a_n = \log(n)$. This yields the simple calculation:
\begin{aligned} &\lim_{n \rightarrow \infty} a_{n+1} - a_n = \log(n+1) - \log(n) \\ &= \log((n+1)/n)) \\ &= \log(1 + 1/n) \xrightarrow{n \rightarrow \infty} \log(1) = 0 \end{aligned}
while on the other hand,
\begin{aligned} \lim_{n \rig... | {
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quantum-field-theory
Generalized free fields are usually discussed using the parametrization given by the Kallen-Lehmann decomposition of the 2-point function $G_2(x,y)$, which says that (for scalar fields)
$G_2(x,y) = \int_0^\infty d\rho(m) \Delta_m(x-y)$,
where $\Delta_m(x-y)$ is the real-space propagator for a fre... | {
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Starting with table as input you can use FindSequenceFunction iteratively to find the function f0[table][x,y] that generates table:
ClearAll[f0]
f0[tab_][x_, y_] := FindSequenceFunction[FindSequenceFunction[#][y] & /@ tab][x]
Example:
table // Grid[#, Dividers -> All]& // TeXForm
$\begin{array}{|c|c|c|c|c|c|c|c|c... | {
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"t... |
5. You find the vertex at $V\left(\dfrac b2\ ,\ \dfrac{b^2}4\right), b \geq 0$ or at $V\left(\dfrac b2\ ,\ -\dfrac{b^2}4 \right), b < 0$. .
That means you know
$x = \dfrac {|b|}2~\wedge~y = \dfrac{b^2}4, b \geq 0~\vee~y=- \dfrac{b^2}4, b < 0$
Calcute b from the first equation and plug in this term into the second equ... | {
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"lm_q2_score": 0.8267117962054049,
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"openwebmath_score": 0.7710940837860107,
"t... |
strings, complexity, palindrome
If we put it all together, you get at most (2n-1) * log2(n) queries which is O(n log n). O(1) extra space is needed. Hope that helps. I'll write up some code later if I have time.
EDIT: Here is an implementation that doesn't include empty strings in the count.
def count_pd(n, query_requ... | {
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homework-and-exercises, newtonian-mechanics, forces, energy, work
However, I don't understand why they only used a component of the initial velocity as it comes off the incline. I used 4.38 m/s because I thought that once the block reaches the horizontal surface, the velocity would be the same. Dose anybody know conce... | {
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"url": null
... |
general-relativity, gravity, spacetime, acceleration, gravitational-waves
I'm also curious as to how the nature of the waves would differ in this case. Any object with mass that accelerates (is it linear or angular acceleration) produces gravitational waves, though in most occasions those will be much too small to be ... | {
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"url... |
filters, discrete-signals, adaptive-filters
Depending on the room size, its construction and frequency of operation, the system will not even have the chance to "resolve" between returns.
A nanosecond of propagation at the speed of light is about 30cm of "distance". The distinct pulses that are expected here, with la... | {
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e. the student did relatively the same on both exams
The correct answer is D but I don't know why.
In Chemistry, she was $\frac{102-90}{64}$ standard deviation units above the mean.
In Statistics, she was $\frac{77-70}{16}$ standard deviation units above the mean. Note that $\frac{7}{16}$ is quite a bit larger than ... | {
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"openwebmath_score": 0.791664183139801,
"tags... |
Copyright (c) Theodore Norvell 2017. Licence: Creative Commons Noncommercial Attribution International 4.0.
This is a Jupyter notebook. See How to use these notes.
Partitions¶
The problem¶ | {
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"openwebmath_score": 0.6921271681785583,
"tags": null,
... |
javascript, jquery, html, css, event-handling
Now we have an iterating loop through the four crystals, and each crystal has a new html attribute which contains its score. Now all we need to do is add the event listeners. We'll do that in the same for loop. Simply use the addEventListener(event, f) function. It takes i... | {
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"tags": "javascript, jquery, html, css, event-handling",
"url": null
} |
c++, recursion, template, c++20, constrained-templates
// recursive_reduce_string template function with execution policy, initial value and specified operation
template<std::size_t base_level, class ExPo, class T, class TI, class BinaryOp>
requires (std::is_execution_policy_v<std::remove_cvref_t<ExPo>> &&
... | {
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"tags": "c++, recursion, template, c++20, constrained-templates",
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} |
# Lecture 004
## Cross Product
Cross Product ($\times$): perpendicular ($\perp$) to all input vectors
• obtained by solving system of equation of $\overrightarrow{w} \cdot x = 0 | \forall x$ input (only particular solution are cross product, because there might be potentially infinite many solutions)
• $\overrighta... | {
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"openwebmath_score": 0.837412416934967,
"tags": nu... |
machine-learning, deep-learning, history
The fundamental algorithms existed already in the 1980s and 1990s, but AI went through 3 AI winters and was not empirical until we can train models with GPU boosted mega servers.
Then Dr. Wang commented to his opinions that we should also develop software systems because we can... | {
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"tags": "machine-learning, deep-learning, history",
"url": null
} |
clojure, finance
(doall (map (comp first csv/parse-csv) (line-seq file)))
is arguably written oddly. I'd just use mapv here to do away with the need for doall. If you want laziness, use map, which returns a lazy sequence. If you want to evaluate everything strictly however, mapv returns a vector.
(mapv (comp first cs... | {
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"tags": "clojure, finance",
"url": null
} |
algorithms, combinatorics, efficiency
Formula when $A=B$ on the OEIS.
Implementation in Haskell
Execution trace for A=["a", "b"] B=["1", "2"] with 54 pairs since $N(2,2)=54$
EDIT: I am wrong: my algorithm behaves like separating $A$ and $B$ into $(A_1,A_2)$ and $(B_1,B_2)$ before interleaving $(A_1,B_1)$ and $(A_2,B_... | {
"domain": "cs.stackexchange",
"id": 286,
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"tags": "algorithms, combinatorics, efficiency",
"url": null
} |
the! 4X + 2 ) and that is the derivative of your original function the velocity! 4X + 2 ) and that is the derivative of the most common examples of a vector x same! Apply for vector derivatives, the derivative of x, so you 'd write DX/DT and... To attempt the proofs angular velocity vector rule in single variable calcu... | {
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"openwebmath_score": 0.8595079779624939,
"tags": ... |
algorithms, computational-geometry, linear-algebra
Now there are four cases:
If r × s = 0 and (q − p) × r = 0, then the two lines are colinear.
In this case, express the endpoints of the second segment (q and q +
s) in terms of the equation of the first line segment (p + t r):
t0 = (q − p) · r / (r · r)
t1 = (q + s... | {
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"tags": "algorithms, computational-geometry, linear-algebra",
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cell-biology, cell-signaling
References:
Regulation of nuclear PKA revealed by spatiotemporal manipulation of
cyclic AMP.
Protein kinase A activated in the nucleus as well as the cytoplasm
The where's and when's of kinase anchoring
Localization of A-kinase through anchoring proteins.
The biological functions of A-kin... | {
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"tags": "cell-biology, cell-signaling",
"url": null
} |
homework-and-exercises, waves, acoustics, frequency, wavelength
The thing that I do not understand is the following. Consider the situation illustrated before (source and observer steady, wind blowing): the speed of sound perceived by the observer is not $v_{sound}=343 m/s$ anymore but it should be $v_{sound}=343m/s+... | {
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"tags": "homework-and-exercises, waves, acoustics, frequency, wavelength",
"url": null
} |
general-relativity, black-holes, quantum-gravity, quantum-interpretations
To make this work, you would have to go all the way back in time to where the two electrons were created from the inflaton field, and correlate them back then. This type of back-and-forth in time description is utterly conspiratorial, and very u... | {
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"tags": "general-relativity, black-holes, quantum-gravity, quantum-interpretations",
"url... |
fruit, measurement, decay
Iodine (I) can be used to determine whether fruit is ripening or rotting by showing whether the starch in the fruit has turned into sugar. For example, a drop of iodine on a slightly rotten part (not the skin) of an apple will stay yellow or orange, since starch is no longer present. If the i... | {
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"openwebmath_score": null,
"tags": "fruit, measurement, decay",
"url": null
} |
nuclear-physics, terminology, hydrogen, fusion, explosions
Title: Why Hydrogen bomb is called "Thermonuclear Bomb"? Why do we call Hydrogen bomb as "Thermonuclear Bomb" ? Its called "thermonuclear" because its energy producing nuclear fusion reaction is started by the extremely high temperatures of a nuclear fission b... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "nuclear-physics, terminology, hydrogen, fusion, explosions",
"url": null
} |
quantum-mechanics, classical-mechanics, quantum-entanglement
Title: Tracking photon color in Bell experiments In parametric down-conversion, it is said that a driving photon is converted into two entangled photons whose frequencies add up to the driving frequency. Yet in discussions about entanglement experiments, I h... | {
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"tags": "quantum-mechanics, classical-mechanics, quantum-entanglement",
"url": null
} |
biochemistry, dna
Thus, if we consider a base pair step WX|YZ, we have Y folowing W on the positive sense strand (W->Y), and X following Z in the negative sense (antisense) strand (Z -> X). This means that, if we labeled the strands differently, we would have Z->X on the positive strand and W->Y on the negative one, i... | {
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"id": 11061,
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"openwebmath_score": null,
"tags": "biochemistry, dna",
"url": null
} |
frequency
All that Nyquist–Shannon sampling theorem states is that if you sample a band-limited signal with a rate more than Nyquist rate you can reconstruct it exactly.
EDIT: note that Nyquist frequency is a property of the sampling process, but Nyquist rate is a property of your original (CT) signal.Although in som... | {
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"tags": "frequency",
"url": null
} |
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