text stringlengths 1 1.11k | source dict |
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navigation, robot-pose-ekf, amcl
Originally posted by SilvrCenturion on ROS Answers with karma: 15 on 2015-06-17
Post score: 0
Original comments
Comment by gvdhoorn on 2015-06-18:
Perhaps not the answer you were looking for, but you'll do yourself a favour if you pick up some books for ROS if you're a beginner. See t... | {
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"tags": "navigation, robot-pose-ekf, amcl",
"url": null
} |
resource-request
Title: Is quantum computing mature enough for a computer scientist with no physics background? Sligthly related to this question, but not the same.
Traditional computer science requires no physics knowledge for a computer scientist to be able to research and make progress in the field. Of course, you ... | {
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c++, game, snake-game, fltk
// Constructs window with top-left angle at xy, of size w * h (if
// it's not less than min, which is 400 * 300), labeled with lab
Snake_window::Snake_window(Point xy, int w, int h, const string& lab)
: Window{ xy, w >= min_w ? w - w % cell_w : min_w, h >= min_h ? h - h % ce... | {
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rosparam
Ok, the reason the this->rosNode->getParam("/parameter_from_node", parameter_from_node) returned false was because I set the variable parameter_from_nodeas string while the /parameter_from_node parameter is a float number. I expected all the parameters on the param server to be managed as strings but that is ... | {
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• You can see also this post for the way to derive it. – Mauro ALLEGRANZA Apr 6 '15 at 21:22
• Unless you are taking a credit course in formal logic, don't worry if you don't understand this Generalization Axiom. I could be wrong, but I doubt that most mathematicians have every heard of it. It really is not that diffic... | {
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"tag... |
of r(cos θ + i sin θ) can be written in the rectangular form z = x + i y using the following formulas.. Setelah itu, klik tombol Konversi untuk mengkonversikan dari koordinat rectangular ke koordinat polar. Z = 4 + j 5 0 Comments. How to convert between Polar and Rectangular form The Polar coordinates are in the form (... | {
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"openwebmath_score": 0.8067683577537537,
... |
algorithms, graphs, shortest-path
Title: Is Dijkstra's algorithm just BFS with a priority queue? According to this page, Dijkstra's algorithm is just BFS with a priority queue. Is it really that simple? I think not. You can implement Dijkstra's algorithm as BFS with a priority queue (though it's not the only implement... | {
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"tags": "algorithms, graphs, shortest-path",
"url": null
} |
quantum-field-theory, optics, laser, antimatter, pair-production
Title: Can Chirped Pulse Amplification (CPA) be used for creating antimatter? In this excellent answer by Emilio Pisanty, he states that:
Of course, all the cool laser-driven QED stuff at the top of that second diagram: if your laser is strong enough th... | {
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"tags": "quantum-field-theory, optics, laser, antimatter, pair-production",
"url": null
} |
proteins, protein-folding, thermodynamics
Is it valid to consider these two systems as coupled? In the original version of my answer I argued against this point of view, but am no longer convinced by my own arguments. The water environment is clearly essential for the hydrophobic effect — the burying of the hydrophobi... | {
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"tags": "proteins, protein-folding, thermodynamics",
"url": null
} |
cryptography, differential-privacy
Title: Is the differential privacy definition with lower and upper bound equivalent to the definition with just an upper bound? According to Wikipedia, given a randomized algorithm $\mathcal{A}$, two neighboring datasets $D_1, D_2$, a real number $\epsilon > 0$, $\mathcal{A}$ provide... | {
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"tags": "cryptography, differential-privacy",
"url": null
} |
Suppose $$z_1=1$$ and $$w=-1$$, then $$||z_1|-|w||=0$$
but $$|\mathcal{R}\{z_1\}-\mathcal{R}\{w\}|=2$$
Hence $$||z_1|-|w|| \ge |\mathcal{R}\{z_1\}-\mathcal{R}\{w\}|$$ is not true.
To prove $$|z_n-w|\ge |\mathcal{R}\{z_n\}-\mathcal{R}\{w\}|$$
We have
$$|z_n-w| \ge |\mathcal{R}\{z_n-w\}|=|\mathcal{R}\{z_n\}-\mathcal... | {
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"ta... |
circuit-construction, measurement, projection-operator
To recap: initialize the second register in state $|0\rangle$. Apply inverse Fourier transform $Q^{-1}$ on second register. Apply projector $\Lambda_i$ on first register conditioned on second register being in state $|i\rangle$ (this step requires the assumed know... | {
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"tags": "circuit-construction, measurement, projection-operator",
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} |
c++, interview-questions, c++20
return best_cost;
}
double solve(const std::vector<Waypoint> &waypoints) {
std::multiset<OptimisedWaypoint> opt_waypoints;
opt_waypoints.emplace(waypoints.back());
const auto end = std::prev(waypoints.crend());
int total_penalty = 0;
fo... | {
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} |
complexity-theory, satisfiability
It's not in EXPTIME, and it's not in NP, because it is an oracle problem, whereas NP and EXPTIME are for non-oracle problems -- but it is in the analogue of EXPTIME for oracle problems.... and in the analogue of NP for oracle problems, too. | {
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"tags": "complexity-theory, satisfiability",
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c#, winforms, dice
Title: Winforms Dice Control This is my second Custom Control I have made, a dice. The code below has worked 100% in all my tests, program contains 1 dice control and seven buttons, 6 for setting a number directly, and one for randomizing it. Feedback and improvement suggestions are greatly apprecia... | {
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"tags": "c#, winforms, dice",
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} |
c#, .net, winforms
It is ridiculously slow. Pasting 500 rows with 5 columns takes about 30 seconds. Please take into consideration that there might be already data in the DataGridView and I don't necessarily want to override it (it all depends on the starting cell). So I don't know how could I use a DataTable and assi... | {
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"tags": "c#, .net, winforms",
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} |
python, python-3.x, web-scraping, beautifulsoup
path = ' '.join([self.amazon_modes[section], category_class.title(), 'Product URLs'])
if cache_content:
if not os.path.exists(path):
os.mkdir(path)
for category_name, category_url in names_urls:
logger.info(f'Proc... | {
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} |
c#, meta-programming, rubberduck
_editor.DeleteLines(selection);
if (newLines.Trim() != string.Empty)
{
_editor.InsertLines(selection.StartLine, newLines);
}
}
private string RemoveExtraComma(string str)
{
if (str.Count(c => c == ',') == 1)
{
... | {
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filtering, wave, oscillator
double fillTable(){
double table[size*oversampling];
//fill table here. skipping for length of example
for(int i =0;i<tableSize;++i){
table[i]=filter(table[i]);
}
double table2[size];
int x=0;
for(int i =0;i<tableSize;++i){
table2[i]=table[x];
... | {
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"tags": "filtering, wave, oscillator",
"url": null
} |
fluid-dynamics, acceleration, speed
Title: How does a body accelerate that is put into a flow field with constant speed? Imagine an infinitely long flow channel filled with water flowing at a constant speed everywhere parallel to the infinitely long dimension of this channel. Furthermore, imagine we place a body (say ... | {
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"tags": "fluid-dynamics, acceleration, speed",
"url": null
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c#, parsing
string lowerCommand = command.ToLower();
string[] splitCommand = lowerCommand.Split(CommandSplitChars);
Func<string[], SendReceiveResult> commandHandler;
if (commandHandlers.TryGetValue(splitCommand, out commandHandler))
{
return commandHandler(splitCommand);
... | {
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} |
optics, electromagnetic-radiation, reflection, refraction
Is it possible to calculate the transmission coefficient $T$ and reflection coefficient $R$ based on other optical properties of the materials, such as the index of refraction? Or do they need to be looked up from a reference table? In addition to Fresnel equat... | {
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"tags": "optics, electromagnetic-radiation, reflection, refraction",
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} |
computability, turing-machines, undecidability, computation-models
After reading some other tangentially related questions, I realized that the number of dimensions in which gravity is operating could be relevant to the question. I'm specifically asking about gravity in 3 spatial dimensions. But, given facts such as y... | {
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3. Jul 12, 2015
### TSny
I believe your two methods are correct. I get the same result using both methods.
4. Jul 12, 2015
### iitjee10
@SteamKing
For the first method, I can calculate the volume. What I intend to find out is the force exerted by the liquid on the curved section of the hypothetical ball (which wi... | {
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"tags... |
a broad family of algorithms for calculating the numerical value of a definite integral , and by extension, the term is also sometimes used to describe the numerical solution. Trapezoidal Rule Example Use the Trapezoidal rule to approximate Z ˇ 0 sinxdx using 1. Define trapezoid rule. 3 Integration of Equations Newton-... | {
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"lm_q1_score": 0.9857180627184411,
"lm_q1q2_score": 0.8170999541679227,
"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 470.40612101045696,
"openwebmath_score": 0.8388261198997... |
quantum-mechanics, mathematical-physics, wavefunction, schroedinger-equation, dirac-delta-distributions
Title: The explicit solution of the time-dependent Schrödinger equation for a free particle that starts as a delta function A previous thread discusses the solution of the time-dependent Schrödinger equation for a m... | {
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"tags": "quantum-mechanics, mathematical-physics, wavefunction, schroedinger-equation, dira... |
game, objective-c, timer
Of these 4 factory methods, there's two groups, scheduled and unscheduled. The two methods that start with the phrase timerWithTimeInterval: create unscheduled timers. The two that start with the phrase scheduledTimerWithTimeInterval: are scheduled timers. The only difference between creati... | {
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"tags": "game, objective-c, timer",
"url": null
} |
everyday-chemistry, surfactants
Does more foam in my soap help clean my hands?
No. Foam/bubbles are small sheets of water with surfactant towards the gaseous phase on the in- and outside. Hence the oily look and texture. What you cleans your hands is the surfactant, because it also helps solubilize hydrophobic stuff l... | {
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"tags": "everyday-chemistry, surfactants",
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increasing x-values allows you to see the connections between exponential functions and geometric sequences. A specialty in mathematical expressions is that the multiplication sign can be left out sometimes, for example we write "5x" instead of "5*x". Then use the slope formula to calculate the slope. r is the growth r... | {
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"lm_q1_score": 0.9901401444055119,
"lm_q1q2_score": 0.8024877059347477,
"lm_q2_score": 0.8104789109591832,
"openwebmath_perplexity": 451.5423627355904,
"openwebmath_score": 0.6478143930435181,
"tags": null,
... |
flask
Title: Jinja2 block that is unreadable I have a block of Jinja2 (used in Sceptre/CloudFormation). It is not readable in my opinion, but I can't find any way to clean it up to improve it.
{% set args = "--kubelet-extra-args '--node-labels=nodegroup=" + sceptre_user_data.node_group_name %}
{% if sceptre_user_dat... | {
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graphs, np-hard, 3-sat
You also need to verify that there is no point for the paths to cross between the parts. If only one of the paths crosses, then the two paths will be close together (at some constant distance, which for large enough $k$ will be smaller than $k$) immediately after the crossing. If both cross, the... | {
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"tags": "graphs, np-hard, 3-sat",
"url": null
} |
autocorrelation, music
where overlines stand for expectation operation, i.e., $\overline{XX^H}\triangleq E\left[XX^H\right]$. As I understand, the MUSIC algorithm needs to observe signals multiple times to get $S$, i.e., $S=\frac{1}{N}\sum_{i}^{N}{X_{i}X_{i}^{H}}$
On the other hand, when I googled implementations of t... | {
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"tags": "autocorrelation, music",
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} |
deep-learning, generative-adversarial-networks, image-processing, image-super-resolution
The first problem, differences in details when processing frames separately, is called temporal coherence. There are a variety of ways to increase temporal coherence when upscaling. All require some comparison between consecutive ... | {
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"tags": "deep-learning, generative-adversarial-networks, image-processing, image-super-resolution... |
quantum-mechanics, homework-and-exercises, operators, hilbert-space, quantum-states
Title: Quantum mechanics: Can you simplify $\langle x\rangle\langle p\rangle$ further? Really quick question: It feels somehow wrong to write it out, so just correct me:
$$\langle x\rangle\langle p\rangle=\langle\psi|x|\psi\rangle\lang... | {
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"tags": "quantum-mechanics, homework-and-exercises, operators, hilbert-space, quantum-state... |
c, stack
Which reduces the complexity of the function and reduces the number of assignments to fields to 1.
Use of Fixed Sized Arrays
If the structs keep a record of the capacity of the arrays, they could start at a much smaller size (1024) and be reallocated as necessary when the m_Count value reaches the capacity wh... | {
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"tags": "c, stack",
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thermodynamics, energy, entropy
Callen then gives as a postulate that there exists some function $S$ of these $M+1$ extensive variables. Indeed, Callen says, for every system to which thermodynamics can be applied we have some configuration space of the variables $S,U,X_1,...X_M$ on which there is some surface which d... | {
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"tags": "thermodynamics, energy, entropy",
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} |
I've overlapped the curves below to show that they match. The green is the original curve from your picture; the blue is the curve from the equations above.
• @Giffyguy: Or, if you rather replicate my curve for $(0,40)$ to $(120,0)$, use control points $(0,40), (40,40), (80,0), (120,40)$; or, $(-60,20), (-20,20),(20,-... | {
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"lm_q1_score": 0.9777138177076644,
"lm_q1q2_score": 0.8189526061940051,
"lm_q2_score": 0.8376199572530448,
"openwebmath_perplexity": 1271.6311474286167,
"openwebmath_score": 0.9832265973091125,
"ta... |
java, recursion
} else {
if(currentParent.getRightChild() == null)
currentParent.setRightChild(newNode);
else
insertNode(currentParent.getRightChild(), newNode);
}
} A BST must not contain duplicate values.
Your implementation allows inserting a duplicate value as the right... | {
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"id": 13644,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, recursion",
"url": null
} |
performance, primes, assembly, sse
So toplev.py is telling us that we're wasting more than 63% of our CPU's potential due to "bad speculation" - which in this case is 100% branch mispredicts.
Now this behavior isn't unexpected given the frequent and random nature of the exits from the inner loop. In fact, we expect ab... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, primes, assembly, sse",
"url": null
} |
water, decomposition, process-chemistry
Title: Do dessicants work inside of a freezer? I learned that water sublimates when frozen, which prompts me to ask:
Do dessicants work inside a freezer?
While dessication inside of a freezer is unlikely to remove large quantities of water fast, it intuitively seems to me that m... | {
"domain": "chemistry.stackexchange",
"id": 16831,
"lm_label": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "water, decomposition, process-chemistry",
"url": null
} |
brain, cardiology, breathing
Breathing, however, is directly controlled by the brain. Without signals from the brain, breathing will stop completely (the technical term is "respiratory arrest", but that literally just means "breathing-stuff stopped-ness"). Survival time without breathing depends on a number of factors... | {
"domain": "biology.stackexchange",
"id": 3393,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "brain, cardiology, breathing",
"url": null
} |
First of all I suggest the use of the identity $2\cos^2(\theta)=\cos(2\theta)+1$ in order to have a second degree polynomial at the denominator (later you will have to compute just ONE residue). $$I:=\int_0^{2\pi} \frac{d\theta}{8\cos^2 (\theta) + 1}=\int_0^{2\pi} \frac{d\theta}{4\cos(2\theta)+4 + 1}=\int_0^{2\pi} \fra... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9873750496039276,
"lm_q1q2_score": 0.8026049105093448,
"lm_q2_score": 0.8128673201042492,
"openwebmath_perplexity": 179.73138723751563,
"openwebmath_score": 0.9663976430892944,
"ta... |
c++, strings, c++11, morse-code
split.h
#ifndef SPLIT_H_INCLUDED
#define SPLIT_H_INCLUDED
#endif // SPLIT_H_INCLUDED
#include <string>
#include <sstream>
#include <vector>
std::vector<std::string> &split(const std::string &s, char delim, std::vector<std::string> &elems) {
std::stringstream ss(s);
std::string... | {
"domain": "codereview.stackexchange",
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"tags": "c++, strings, c++11, morse-code",
"url": null
} |
dynamic-programming
Recurrence of DP: $dp[i][j] = dp[i-1][j-a_j] \text{ OR } dp[i-1][j]$
$dp[]$ is a boolean array of dimension $n \times\dfrac{A}{3}$. Here my solution:
boolean 3_Partition(int arr[]) {
if (arr == null)
return false;
int sum = Arrays.stream(arr).sum();
if (sum %... | {
"domain": "cs.stackexchange",
"id": 17649,
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"openwebmath_score": null,
"tags": "dynamic-programming",
"url": null
} |
python, pandas
df = pd.read_csv('278083.csv', index_col='Name')
to_concat = []
for i in range(1, df.shape[1]//2 + 1):
email = f'People{i}.Email'
company = f'People{i}.CompanyName'
sub = (
df[[email, company]]
.dropna()
.rename({
email: 'Email',
company: 'Com... | {
"domain": "codereview.stackexchange",
"id": 43538,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, pandas",
"url": null
} |
css
@media only screen and (max-width:800px) {
.col[class*="-6-"] { width: 16.666%; }
.col[class*="-5-"] { width: 20%; }
.col[class*="-4-"] { width: 25%; }
.col[class*="-3-"] { width: 33.333%; }
.col[class*="-2-"] { width: 50%; }
.col[class*="-1-"] { width: 100%; }
} | {
"domain": "codereview.stackexchange",
"id": 11836,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "css",
"url": null
} |
# Which one is the larger , $10^{30!}$ or $10^{30}!$?
So, I have got this problem in which one is asked to find the greater one between $10^{30!}$ or $10^{30}!$.
Taking $\log$ both sides leads me nowhere.
• $({}{}10^{30})!$ – Lord Shark the Unknown Jun 19 '18 at 18:14
• You may compare the max no. of digits of first... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9787126506901791,
"lm_q1q2_score": 0.8069113215784547,
"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 631.2459666928855,
"openwebmath_score": 0.645036518573761,
"tags... |
python
data_1 = None
with open("cp.log",'r+') as f:
data_1 = f.readlines()
del data_1[-1]
print cmp(data, data_1)
[Question]: Does cmp function works fine in list also. I have used first time and not sure how internally works. If you don't mind reading the entire files into memory at once (as you are currently d... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python",
"url": null
} |
mechanical-engineering
This is a rough model of a four bar (ABCFD) which push point E toward the object to hold (LMNOQ)
The object, represent here as rectangle LMNOQ, moves on a fixed bar (HL).
When pushed up (represented by piston A1 expanding), point E moves towards the edge NQ. The angle FDB (in the locked position... | {
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"id": 575,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mechanical-engineering",
"url": null
} |
python, performance, programming-challenge, computational-geometry
This saves about 6 seconds; time now 15.1 seconds.
You can avoid some repeated multiplications by naming the various products of i, j, k, and l:
for i, j in product_pairs(number // 2):
for k, l in product_pairs(i):
p, q, r = 2 * j * i, j * ... | {
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"openwebmath_score": null,
"tags": "python, performance, programming-challenge, computational-geometry",
"url": nu... |
energy, energy-conservation
The fact that the kinetic energy is arbitrary does not mean that we can make our collision arbitrarily destructive. The thing that determines how much the cars are damaged in the collision is not the initial kinetic energy alone, but how much kinetic energy is lost in the collision. If we h... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "energy, energy-conservation",
"url": null
} |
electromagnetism, general-relativity, black-holes, charge, reissner-nordstrom-metric
As this wikipedia entry on charged black holes points out, though, the electric charge of a black hole is generally expected to be quite small.
Far away from the black hole, you could in principle measure the electric charge in the sa... | {
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"openwebmath_score": null,
"tags": "electromagnetism, general-relativity, black-holes, charge, reissner-nordstrom-metri... |
molecular-evolution, protein-evolution, origins
Regarding the transition from RNA-only to RNA-protein world, peptides
function as cofactors for some ribozymes. Amino acids and peptides are
known to have existed in the prebiotic environment and have been found
in space (glycine has been found in comets, along with othe... | {
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"openwebmath_score": null,
"tags": "molecular-evolution, protein-evolution, origins",
"url": null
} |
c#, asp.net, image, linq-to-sql
public bool IsReusable {
get {
return false;
}
}
}
The handler call is a static method from DBManager, a custom static class which provides LINQ-To-SQL queries. The method is called GetRezeptImages():
public static List<Image> GetRezeptImages(int rezep... | {
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"tags": "c#, asp.net, image, linq-to-sql",
"url": null
} |
cosmology, universe, big-bang, space-expansion, faster-than-light
The edge of the observable universe is receding from us with a recession velocity of more than 3 times the speed of light. $3.18c$, to be exact. In other words, we can observe sources that are moving away from us faster than the speed of light. Sources ... | {
"domain": "physics.stackexchange",
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"tags": "cosmology, universe, big-bang, space-expansion, faster-than-light",
"url": null
... |
For example, many applied problems in economics and finance require the solution of a linear system of equations, such as
$$\begin{array}{c} y_1 = a x_1 + b x_2 \\ y_2 = c x_1 + d x_2 \end{array}$$
or, more generally,
$$\begin{array}{c} y_1 = a_{11} x_1 + a_{12} x_2 + \cdots + a_{1k} x_k \\ \vdots \\ y_n = a_{n1} x_... | {
"domain": "quantecon.org",
"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9896718456529513,
"lm_q1q2_score": 0.8225588762452533,
"lm_q2_score": 0.8311430499496096,
"openwebmath_perplexity": 466.1709062883697,
"openwebmath_score": 0.9561919569969177,
"tags": ... |
lagrangian-formalism, coordinate-systems, differentiation, noethers-theorem, variational-calculus
- \partial_\mu \left[ \frac{\partial\mathcal{L}}{\partial(\partial_\mu\phi)}(\partial_\nu\phi)\delta x^\nu \right]- \left[ \partial_\mu \frac{\partial\mathcal{L}}{\partial(\partial_\mu\phi)}\right] \delta\phi
+ \left[ \... | {
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"id": 77213,
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"openwebmath_score": null,
"tags": "lagrangian-formalism, coordinate-systems, differentiation, noethers-theorem, varia... |
ros-kinetic, rasbperrypi
Title: ROS installation error on raspbian buster
hello
I'm trying to install ROS on raspberry pi 4 with raspibian buster. I followed this tutorial:
Installing ROS Kinetic on the Raspberry Pi
I chose the option: "ROS-Comm: (recommended) ROS package, build, and communication libraries. No GUI t... | {
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"tags": "ros-kinetic, rasbperrypi",
"url": null
} |
ros, setup.bash
Originally posted by gvdhoorn with karma: 86574 on 2021-06-19
This answer was ACCEPTED on the original site
Post score: 2
Original comments
Comment by ijnek on 2021-06-19:
Confirmed that, that is the case. Thanks! I have put a PR up for the fix. (https://github.com/ros2/ros2_documentation/pull/1693)
C... | {
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"tags": "ros, setup.bash",
"url": null
} |
ros, gazebo, ros-kinetic, position
This code is working pretty well in some cases where the robot gets into the acceptable range well and drives straight without any correction needed.
In other cases the robot will turn, then drive a very small distance, then correct its course again a little bit and repeat this which... | {
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"tags": "ros, gazebo, ros-kinetic, position",
"url": null
} |
immunology, biotechnology, vaccination, coronavirus
But to really answer your question, what are some challenges of developing a vaccine?
To begin with, from the perspective of lab research, we first need to develop a vaccine candidate. What protein on the virus should we take as an antigen? There are many many protei... | {
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"tags": "immunology, biotechnology, vaccination, coronavirus",
"url": null
} |
javascript, parsing
}
} else if(accountsBool == true) {
if(inputArr[i].replace(/[\t]/))
switch(marker) {
case 1:
accountLinesArray[arrayNumb] = new account;
break;
case 2:
break;
case 3:
break;
... | {
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"openwebmath_score": null,
"tags": "javascript, parsing",
"url": null
} |
transform
Title: ROS Answers SE migration: tf view_frames
Hello
I was just wondering if anyone knows a way to generate a formated pdf from
rosrun tf view_frames
I want to include the frames.pdf that is generated in a report by it is very very wide.
Can I do something to get a more vertically oriented graph, that fits... | {
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"tags": "transform",
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} |
ros, inverse-kinematics, ros-kinetic, ur-driver
The repeatability of a UR5 is specced as +-0.1mm or 0.001m (datasheet). Taking that into account the differences don't seem to be so egregious.
Originally posted by gvdhoorn with karma: 86574 on 2019-06-06
This answer was ACCEPTED on the original site
Post score: 1
Ori... | {
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"openwebmath_score": null,
"tags": "ros, inverse-kinematics, ros-kinetic, ur-driver",
"url": null
} |
navigation, hokuyo, gmapping
Compile gmapping and test again.
If i am right, that should do the trick. It would still be nice if you could create a bag file, so that we have an actual usecase for testing a patch.
Regards, Ben
EDIT (20.01.2012): Sadly the changes above are incomplete and make the result even worse. B... | {
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"tags": "navigation, hokuyo, gmapping",
"url": null
} |
newtonian-mechanics, mass, momentum, conservation-laws, collision
Title: On defining mass scales using collisions In A.P. French's Newtonian Mechanics (pages $319$, $320$), the author described a way to define a scale for masses. He said,
One can set up an inertial mass scale for a number of objects $1, 2, 3,…$ by fi... | {
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"tags": "newtonian-mechanics, mass, momentum, conservation-laws, collision",
"url": null
... |
c++, beginner, algorithm, vectors, stl
try {
for (std::size_t index{ 0 }; index < count; ++index) {
std::allocator_traits<allocator_type>::construct(m_allocator, m_vector + size() + index, m_vector[size() + index]);
++copies_made;
}
}
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, beginner, algorithm, vectors, stl",
"url": null
} |
discrete-signals, autocorrelation, correlation
Here, $n$ is the dataset's size, $0 < k < n$, $\sigma$ is the standard deviation and $\mu$ is the mean.
Now, I've read the descriptions on the page, but I don't fully understand all of the terms in there. I understand why we divide by $(n-k$), because the number of datap... | {
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"openwebmath_score": null,
"tags": "discrete-signals, autocorrelation, correlation",
"url": null
} |
particle-physics, standard-model, mesons
Particle
Mass (Gev)
Total Width (GeV)
"Reduced Width" $MeV^{-2}$
$\pi^0$
0.135
7.73E-9
3.1
$\eta$
0.548
1.31E-6
8.0
$\Sigma^0$
1.19
8.90E-6
5.3
$D^*$
2.01
8.34E-5
10.3
$J/\Psi$
3.10
9.29E-5
3.1
$\Psi(2S)$
3.69
2.94E-4
5.9
$B(s2)^*$
5.84
1.49E-3
7.5
$Z^0$
91.... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics, standard-model, mesons",
"url": null
} |
genetics, evolution, retrovirus
Title: How does heredity work with Endogenous retrovirus? Q1: If someone in a species gets infected with an endogenous retrovirus, does that mean that absolutely all of their children will have that endogenous retrovirus? Or is it based on chance?
Q2: is there such a thing as an allele ... | {
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"openwebmath_score": null,
"tags": "genetics, evolution, retrovirus",
"url": null
} |
python, xgboost, prediction, binary-classification
prediction = xgb_model.predict(x_predict)
prediction_df = x_predict
prediction_df['Prediction'] = prediction
#this ONLY displays 0's
print("XGBOOST FUTURE PREDICTIONS:")
with pd.option_context('display.max... | {
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"openwebmath_score": null,
"tags": "python, xgboost, prediction, binary-classification",
"url": null
} |
java, chat
Would there be any bugs or potential large-scale issues (both performance and general failure-to-work) that could spring up with how this code is currently arranged and set up? If so, how could I solve them?
(And, I'm not sure this is within the scope of this site, so if it's not, please correct me and I wi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, chat",
"url": null
} |
c, logging
In tp_vlog_write
MAX_TIME_LEN and MAX_MSG_LEN seem generous for a log message. Remember that
msg is on the stack and if you are in a restricted environment, 1500 bytes
might be too much. ctime uses 26 bytes for the time/date, so I doubt your time
format needs 512.
level seems like it should be a enum tp_... | {
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special-relativity, speed-of-light
This one-way anisotropy in the speed of light is sometimes called “conspiratorial anisotropy”. There is always some other anisotropic effect that conspires with the speed of light to produce isotropic observations. Since the observations depend on both, it is impossible to refute the... | {
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Update: Rereading the question, I see an algorithm wasn't requested. The answer is: given $M$ stacks, you can sort up to $2^i$ cards, where $M = 3i+1$.
I think my approach is optimal. I know you need $O(\log_2 N)$ stacks to sort $N$ cards. | {
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Dimension of a vector space of functions
Where $$S$$ is a set, the functions $$f: S \rightarrow \mathbb{R}$$ form a vector space under the natural operations: the sum $$f+g$$ is the function given by $$f +g(s)=f(s)+g(s)$$ and the scalar product is $$r\cdot f(s) = r\cdot f(s)$$. What is the dimension of the space resul... | {
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"lm_q1_score": 0.9648551515780318,
"lm_q1q2_score": 0.8400002528946441,
"lm_q2_score": 0.8705972616934406,
"openwebmath_perplexity": 127.0496417170133,
"openwebmath_score": 0.8934762477874756,
"tag... |
turing-machines, computability
If $M$ does not accept $w$, then for any word $x$ of length $n$, executing $M$ during $n$ steps will never reach an accepting state. And so, after $n$ steps of simulation, the TM $K$ will accept the word $x$. | {
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"openwebmath_score": null,
"tags": "turing-machines, computability",
"url": null
} |
javascript, optimization, jquery, animation
var scrollAmount = delta * scrollRatePerSecond / 1000;
// Do something with scrollAmount
}
requestAnimationFrame(loop);
}
requestAnimationFrame(loop);
}
In that code I've also added a frameskip option, which means 'skip this many frames f... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, optimization, jquery, animation",
"url": null
} |
java, beginner, math-expression-eval
ArrayList<String> ResultArr = new ArrayList<>();
if(Negative){ //Negate parameter
separatedString.set(separatedString.size()-1,Float.toString(-(Float.valueOf(separatedString.get(separatedString.size()-1)))));
} | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, beginner, math-expression-eval",
"url": null
} |
organic-chemistry, inorganic-chemistry, biochemistry, smell
Title: Why does urine smell like ammonia? Apparently, water or $\ce{H2O}$ combines in some way with nitrogen (from the air or elsewhere?) to form ammonia, or $\ce{NH3}$. Where/how in the body is this $\ce{NH3}$ (or whatever nitrate) produced before it is excr... | {
"domain": "chemistry.stackexchange",
"id": 1850,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, inorganic-chemistry, biochemistry, smell",
"url": null
} |
hash, hash-tables
But here are the parts that are still very ambiguous to me:
Why use a hash function and not an RNG with a set seed and array size?
Why is it ok to have "collisions", which from what I understand is two keys pointing to the same index? I mean don't we rely on that stuff to be reliable?
Why do we mod ... | {
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"openwebmath_score": null,
"tags": "hash, hash-tables",
"url": null
} |
ros, ros-fuerte, ar-track-alvar
However, an example XML file included in ar_track_alvar seems like not to follow that rules. (It progresses counter-clockiwise around tag. e.g. lower left -> lower right -> upper right -> upper left)
I also tried to make XML file through createMarker. However, it is also weird. 4 points... | {
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"id": 13759,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, ros-fuerte, ar-track-alvar",
"url": null
} |
quantum-mechanics, quantum-information, quantum-optics, perturbation-theory
$$
\hat d = q\left (\begin{matrix}\hat x \\ \hat y \\ \hat z \end{matrix}\right )
$$
A matrix element with regard to electronic states $|f\rangle, |i\rangle $ is then
$$\begin{aligned}
\vec d_{fi}\equiv \langle f|\hat d|i\rangle = q\left (\beg... | {
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"tags": "quantum-mechanics, quantum-information, quantum-optics, perturbation-theory",
"u... |
discrete-signals, convolution, deconvolution
# convolution of ISR
ax[2].plot(data_isr.iloc[:,0], np.convolve(data_isr.iloc[:,1],
biExp(data_isr.iloc[:,1], a,b,c,d), mode = "same")/5, # bi exponential function
color = "royalblue", marker = "d")
ax[2].plot(new_x, np.convolve(new_y,
biExp(new... | {
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"openwebmath_score": null,
"tags": "discrete-signals, convolution, deconvolution",
"url": null
} |
pid
Conversely, while the person who doesn't start braking until they hit 1000 feet may have got there first, it will take time, some distance, to stop. They have overshot the 1000 foot mark. If they overshoot by 10 feet then go in reverse as quickly as they can, they get back to the mark, but will probably overshoot ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "pid",
"url": null
} |
reaction-mechanism, redox
Title: Why can hydrogen ions be added to balance a reaction? This link explains the process behind balancing redox equations.
Now you have to add things to the half-equation in order to make it
balance completely.
All you are allowed to add are:
electrons
water
hydrogen ions (unless the r... | {
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"id": 7691,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reaction-mechanism, redox",
"url": null
} |
filters, audio, noise
Title: What happens to the audio of a reconstructed signal if we remove too much frequency? Assuming we have an audio with noise embedded in it, I was wondering what happens theoretically if we remove (filter out) too much frequency when we pass LPF with a cutoff frequency lower than the perfect ... | {
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"id": 10118,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "filters, audio, noise",
"url": null
} |
machine-learning, natural-language-processing
Concerning you actual question, how to represent the input, I'm not quite sure if you have to limit the size of your input beforehand or not. In any way, you could choose the size of your input window so that any block of text that you possibly want to put in would fit (if... | {
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"tags": "machine-learning, natural-language-processing",
"url": null
} |
on Discrete Mathematics Miguel A. In logic, a syllogism is a form of deductive reasoning consisting of a major premise, a minor premise, and a conclusion. " Corresponding Tautology: ((p →q) ∧ (q→ r))→(p→ r). In order to determine the truth values of the mathematical statements the valid arguments that are used are proo... | {
"domain": "hotrodsmc.it",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9626731126558706,
"lm_q1q2_score": 0.8275751785408014,
"lm_q2_score": 0.8596637505099168,
"openwebmath_perplexity": 1368.7071444141018,
"openwebmath_score": 0.5895121097564697,
"tag... |
mind that the spring selected must lie within 3. Do more together With Google Sheets, everyone can work together in the same spreadsheet at the same time. Keep the bottom-most winding bar in place and remove the second bar. Figure 4: Tributary area of selected nodes. Khan Academy is a 501(c)(3) nonprofit organization. ... | {
"domain": "eccellent.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754452025767,
"lm_q1q2_score": 0.8288408555649722,
"lm_q2_score": 0.8418256412990657,
"openwebmath_perplexity": 925.3106616176226,
"openwebmath_score": 0.5688485503196716,
"tags... |
c, primes, sieve-of-eratosthenes
Title: Sieve of Eratosthenes in C I have attempted to implement the Sieve of Eratosthenes in C. It works rather quickly with values tested up to ten million: time ./soe.out 10000000 returns real: 0m0.218s (this is of course, not including the result printing at the end which takes the ... | {
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"id": 28188,
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, primes, sieve-of-eratosthenes",
"url": null
} |
complexity-theory, turing-machines
Title: Showing the language of TMs that halt on a decidable set of words is not in RE I need to show that the following language, L = {$\langle M \rangle$ | The set of words which M halts on is decidable}, is not recursively enumerable. In the instructions they advise thinking of a r... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "complexity-theory, turing-machines",
"url": null
} |
energy, photons, frequency, photoelectric-effect, intensity
One last attempt
I’ll try one last time to explain why two photon interactions are very rare without special setups. Fundamentally, it is a interesting question.
I think the source of your confusion is your mental picture of light. You might know that light i... | {
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"tags": "energy, photons, frequency, photoelectric-effect, intensity",
"url": null
} |
graphs, functional-programming, order-theory, termination
Give an assignment of values in $\mathbb{N}^t$ to nodes and an order that decreases at each transition. That is, if $\text{nodes} = \{0,\ldots,n-1\}$, I want to build a map $f:\mathbb{N} \times \text{nodes} \to \mathbb{N}^t$ with $t > 0$ satisfying: $\forall i ... | {
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"lm_q1q2_score": null,
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"openwebmath_score": null,
"tags": "graphs, functional-programming, order-theory, termination",
"url": null
} |
Lastly, we can came back to your original intuition. Given a natural number $$a>1$$, the $$a$$-ary representation of a power of $$a$$, say $$a^j$$, is made by a $$1$$ followed by $$j$$ $$0$$s, so the $$a$$-ary representation of the sum $$a^0+a^1+\ldots +a^{n-1}$$ is simply made by $$n$$ consecutive $$1$$s. For the same... | {
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"id": null,
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"lm_q1_score": 0.9820137868795702,
"lm_q1q2_score": 0.8385540907145932,
"lm_q2_score": 0.8539127473751341,
"openwebmath_perplexity": 160.3873146389179,
"openwebmath_score": 0.9789509773254395,
"tag... |
homework-and-exercises, error-analysis
How do you explain this?
(The mark scheme lists $5\%$ as the correct answer) You're confusing independent and dependent variables. When you propogate from uncertainties in the $x_{i}$ to some $f(x_{1},x_{2}...)$, the formula $\delta f(x_{1}...)=\sum \left|\frac{\partial f}{\par... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, error-analysis",
"url": null
} |
# Normalize the wave function
1. Oct 16, 2014
### jimmycricket
1. The problem statement, all variables and given/known data
Normalize the wave function ,$\psi(x)$, where $$\psi(x)=\frac{1}{1+ix}$$.
2. Relevant equations
3. The attempt at a solution
$$\langle\psi\mid\psi\rangle= \int_{-\infty}^{\infty}\frac{1-ix}{1... | {
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"lm_q1_score": 0.9585377249197138,
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"lm_q2_score": 0.8438950986284991,
"openwebmath_perplexity": 571.9148339830857,
"openwebmath_score": 0.9034814238548279,
"tags... |
machine-learning, deep-learning, time-series, model-evaluations, topic-model
Title: Evaluating the result of topic modeling in a way that time matters I have run different topic modeling approach on my data(its clinical data related to Cognitive impairment diseases. we are going to process what thing is important that... | {
"domain": "datascience.stackexchange",
"id": 3529,
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "machine-learning, deep-learning, time-series, model-evaluations, topic-model",
... |
The use of this term does not mean that mathematicians consider category theory to be fuzzy or non-rigorous, merely that it is too complex to follow the details in casual conversation.
-- Beland 07:24, 9 Jan 2005 (UTC)
I added an analogy as you suggested to the background section and also the clarification to the int... | {
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"lm_q1_score": 0.9433475794701961,
"lm_q1q2_score": 0.8055365233150779,
"lm_q2_score": 0.8539127473751341,
"openwebmath_perplexity": 1373.2999106960624,
"openwebmath_score": 0.6862840056419373,
"tags":... |
java, object-oriented, game
// define methods that must be defined across all character types
public int getLevel();
public String getPrimaryAttribute();
public String getAttackType();
public String getAbility1();
public String getAbility2();
public String getAbility3();
public String getAb... | {
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"id": 8729,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, object-oriented, game",
"url": null
} |
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