text stringlengths 1 1.11k | source dict |
|---|---|
homework-and-exercises, special-relativity, reference-frames, coordinate-systems, inertial-frames
As $$x'_1=\gamma(x_1-vt_1)$$
$$\implies -\frac{1}{2}=\frac{10}{6}(x_1-0)$$
$$\boxed{
\implies x_1=-0.3 \\
\text{Similarly}\;\; x_2=+0.3}$$
We can find $$t'_1=\gamma\Big(t_1-\frac{0.8cx_1}{c^2}\Big)=\frac{10}{6}\Big(0-... | {
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"tags": "homework-and-exercises, special-relativity, reference-frames, coordinate-systems, ... |
this formula has been estimated? Complete … The maximum number of edges in a bipartite graph with n vertices is [n 2 / 4] If n=10, k5, 5= ⌊ n 2 / 4 ⌋ = ⌊ 10 2 / 4 ⌋ = 25. This graph is the line graph, L(G). Such a drawing (with no edge crossings) is called a plane graph. In a complete graph, every pair of vertices is c... | {
"domain": "com.au",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9850429129677614,
"lm_q1q2_score": 0.8187115627752205,
"lm_q2_score": 0.8311430415844385,
"openwebmath_perplexity": 1003.8854289814757,
"openwebmath_score": 0.4934229850769043,
"tags": null,
... |
object-oriented, swift, http, ios, bluetooth
extension Request where Self: HTTPRequest {
func execute() {
// Again, same thing, we have all vars we need
provider.performRequest(data: data, token: accessToken, method: method, params: params)
}
}
Then, when you are implementing a new Request, al... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "object-oriented, swift, http, ios, bluetooth",
"url": null
} |
classical-mechanics, angular-momentum, momentum, collision, angular-velocity
$$ \begin{pmatrix} x_p \\ y_p \end{pmatrix}= \begin{pmatrix} x + \frac{a}{2}\cos\theta-\frac{b}{2}\sin\theta \\ y + \frac{a}{2}\sin\theta + \frac{b}{2} \cos\theta \end{pmatrix}$$
The constraint is if the form of a line (plane in 3D) $n_x x ... | {
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"tags": "classical-mechanics, angular-momentum, momentum, collision, angular-velocity",
"... |
acid-base, equilibrium, aqueous-solution, ph
Further reactions involving B(OH)4- (aq) introduce species such as H2B4O7, HB4O7- and B4O72-. What is very curious is that the K of the reaction of B(OH)3 (aq) and H2O is said to equal 7.3 x 10-10 in a Wikipedia article
(https://en.wikipedia.org/wiki/Boric_acid#Properties... | {
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"openwebmath_score": null,
"tags": "acid-base, equilibrium, aqueous-solution, ph",
"url": null
} |
neural-network, keras, batch-normalization, keras-rl
actor = Sequential([
Dense(600, input_shape = your_input_shape, activation = 'relu', use_bias = False),
BatchNormalization(),
Dense(300, activation = 'relu', use_bias = False),
BatchNormalization(),
Dense(actNum, activation = 'tanh')
])
Ple... | {
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"openwebmath_score": null,
"tags": "neural-network, keras, batch-normalization, keras-rl",
"url": null
} |
c, game, console, tic-tac-toe
return 0;
}
int checkVerticalVictory(char* board[8][8])
{
int counterX;
int counterO;
for(int j=1; j<=5; j+=2)
{
counterX = 0;
counterO = 0;
for(int i=1; i<=5; i+=2)
{
if(board[i][j] == ' ')
{
break... | {
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"openwebmath_score": null,
"tags": "c, game, console, tic-tac-toe",
"url": null
} |
gazebo, simulation, rviz, ros-kinetic, scan
All of the parameter yaml files for configuring costmaps and stuff are exactly the same as the example in the book which can be found here https://github.com/osrf/rosbook/tree/master/code/tortoisebot.
if you need any other files please let me know im still pretty new to this... | {
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"tags": "gazebo, simulation, rviz, ros-kinetic, scan",
"url": null
} |
python, combinatorics, complexity
is effectively the same as:
sol_matrices = (list(zip(*[iter(matrix)]*width)) for matrix
in product((False, True), repeat=width**2))
and so would benefit from having its own function (which would have a name and docstring that would explain what it does).
The algorithm... | {
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"openwebmath_score": null,
"tags": "python, combinatorics, complexity",
"url": null
} |
gravity, roche-limit
I'm curious as to how the debris will spread out, though, once the moon is ripped apart. Can I calculate the inner and outer radii of the newly formed ring, based on what I know? Or is there not a direct relationship between these radii and the initial conditions? I think there are two key aspects... | {
"domain": "astronomy.stackexchange",
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"tags": "gravity, roche-limit",
"url": null
} |
• Thank you very much. The step by step explanation is great. There is one last thing confusing me. You say "paddle wheel turn and the axis of rotation points in the direction of the curl". If the paddle wheel was on the very peak of the wave, isn't its curl zero? Therefore isn't the derivative of the tangent to that s... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9780517450056273,
"lm_q1q2_score": 0.8085669148954329,
"lm_q2_score": 0.8267117962054049,
"openwebmath_perplexity": 221.76884355684732,
"openwebmath_score": 0.7587857246398926,
"ta... |
orbit, light, space-time
Title: If an exoplanet transit we are seeing is 13000 light years away, are we seeing a 13000-year-old orbit? If a star is 13000 light years away, doesn't that mean we are seeing 13000-year-old light? If it does, then does that mean when we discover a planet with dimming star light, we are se... | {
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"openwebmath_score": null,
"tags": "orbit, light, space-time",
"url": null
} |
c++, file, search, stream, c++98
std::string line;
std::string s1(av[2]);
std::string s2(av[3]);
size_t pos;
while (std::getline(infile, line)) {
if (!infile.eof())
line += '\n';
do {
pos = line.find(s1);
if (pos == std::string::npos)
... | {
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"openwebmath_score": null,
"tags": "c++, file, search, stream, c++98",
"url": null
} |
star, planet, exoplanet, classification
The difference between a gas giant planet and a brown dwarf remains hotly debated among astronomers, but one rule of thumb that astronomers use is the mass below which deuterium fusion ceases, known as the “deuterium-burning limit”, around 13 Jupiter masses. | {
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"tags": "star, planet, exoplanet, classification",
"url": null
} |
javascript, react.js, jsx
This should be changed to:
this.setState(prevState => ({
number: prevState.number - 1
}));
For more info on prevState see the first answer here.
lifecycle event state and prevState in react.js | {
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"tags": "javascript, react.js, jsx",
"url": null
} |
java, beginner, primes, homework
*/
public class PrimalityTest {
public static void main(String[] args) {
// We only test one number, so no other arguments are allowed.
if (args.length > 1) {
System.out.println("Too many arguments. Please enter a positive integer prime canidate.");
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, beginner, primes, homework",
"url": null
} |
c, socket, tcp
int connect_to(char *host, int port) {
int sd;
struct sockaddr_in addr;
fd_set sfds;
struct timeval tv;
sd = socket(AF_INET, SOCK_STREAM, 0);
if (sd == -1) return e_socket;
if (fcntl(sd, F_SETFL, O_NONBLOCK) == -1) return e_sockopt;
memset(&addr, 0, sizeof (addr));
a... | {
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"openwebmath_score": null,
"tags": "c, socket, tcp",
"url": null
} |
2.30 Exercise. Let be an associative binary operation on a set , and let be elements of .
a)
Show that there are five different ways to sensibly put parentheses in the expression
and that all five ways produce the same result. (Each way will use two sets of parentheses, e.g. is one way. If you arrange things correc... | {
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"lm_q1_score": 0.9941800397259856,
"lm_q1q2_score": 0.8219003642711229,
"lm_q2_score": 0.8267117940706734,
"openwebmath_perplexity": 470.27099079024754,
"openwebmath_score": 0.9145391583442688,
"tags": null... |
c++, parsing
if(AWI_REMOVE_DATA_ON_ERROR){
clearAll();
return;
}
lineNumber++;
continue;
}
/* ENSURE THE NAME IS ALREADY TAKEN! */
if(findDuplicateKeyName((curGroup-1), key))
{
m_error_line = lineNumber;
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, parsing",
"url": null
} |
gazebo-11
Title: Does Gazebo have a topic to which we can publish models to be spawned into the world?
I remember few years back when I was learning Gazebo I saw something about some factory topic to which you would publish when you wanted to spawn or delete a model to/from your world. But now I am unable to find any... | {
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"tags": "gazebo-11",
"url": null
} |
homework-and-exercises, waves, acoustics, waveguide
A wave which is guided has different properties than a freely propagating wave. In particular, one can show that a guided wave has a larger speed (please note that a guided wave propagates with one single speed throughout the waveguide, it is incorrect to imagine it ... | {
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"tags": "homework-and-exercises, waves, acoustics, waveguide",
"url": null
} |
# Does an inline algebra expression with multiplication in the dividend imply a quantity?
Here's a trivial one. Given the inline algebra expression (2a + b) / 3c imply that the 3c is a quantity, and that the order of operations should be equivalent to (2a + b) / (3c) ? Or should it be understood as ((2a + b) / 3) c ?
... | {
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"lm_q2_score": 0.85776809953619,
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"openwebmath_score": 0.8028761744499207,
"tags":... |
performance, vba, excel
i_FirstRow = Sheets(1).Range("_FilterDatabase").Row
i_LastColumn = Last(2, Sheets(1).Cells)
Sheets(1).Activate
Call Sort_Em(i_LastRow)
Da_Array = Range(Cells(i_FirstRow, 1), Cells(i_LastRow, i_LastColumn))
'i_FirstRow
s_rows = ""
For ictr = LBound(Da_Array) To UBound(Da_Array) - 1
If ictr ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, vba, excel",
"url": null
} |
keras, time-series, forecasting
You used time, index_1 and index_2 to predict label. Then you would simply need a dataset like this to predict 01/04/2018:
time | index_1 | index_2
01/04/2018 | 60 | 75
Using your model on this data set should predict the label-value.
Now in a time series this can be m... | {
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"tags": "keras, time-series, forecasting",
"url": null
} |
php, optimization, mysql, pagination
Third, if you want to do something every three rows, all you have to do is save an iterator variable to count for you. You can use the modulus operator (%) to find out if it is multiples of 3 or not.
Fourth, it's pointless to have two copies of the same HTML one right after anothe... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, optimization, mysql, pagination",
"url": null
} |
electromagnetic-radiation, mathematical-physics, acoustics, imaging, image-processing
Title: Why are $L^2$ spaces preferred over $L^1$ spaces in some applications? In various applications where we are dealing with electromagnetic or acoustic waves, such as medical imaging, we use the space $L^2$ or the related Sobolev... | {
"domain": "physics.stackexchange",
"id": 33331,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetic-radiation, mathematical-physics, acoustics, imaging, image-process... |
c#, asp.net, api
Title: Async await multiple API calls I have an application that needs to contact a remote API many times to request information about various products. It was taking around a minute with synchronous programming. I adjusted all my methods to be async and I still do not see a performance enhancement. I... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, asp.net, api",
"url": null
} |
conservation-laws, standard-model, feynman-diagrams, strong-force, mesons
Annihilation through a photon is electromagnetic rather than strong, so this is a suppression.
Annihilation through a single gluon can't happen because the gluon has a colour+anticolour charge, whereas the initial meson is colourless. The gluon ... | {
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"tags": "conservation-laws, standard-model, feynman-diagrams, strong-force, mesons",
"url... |
beginner, f#, pathfinding, a-star
member this.H
with public get() = this.h
and public set value = this.h <- value
member this.G
with public get() = this.g
and public set value = this.g <- value
member this.Position
with public get() = this.position
and publi... | {
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"openwebmath_score": null,
"tags": "beginner, f#, pathfinding, a-star",
"url": null
} |
special-relativity, speed-of-light, velocity
And for the P3:
The speed in the P1 reference frame is $v_3=1.8 c/1.81 $ and the distance is $l_{13}=3.6c*\gamma$ in the P1 system. Thus, the P3 signal will reach point P1 in $3.62\gamma$ of P1s time. The difference $1.62\gamma$ seconds is "lost" in the relativity of simult... | {
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"id": 61841,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, speed-of-light, velocity",
"url": null
} |
c
printf("decoded u64 value: %u\n", decode_msg->u64val);
free_encode(&outputmsg);
free_decode(&decode_msg);
}
void testbinary(){
tlv_msg msgstr;
msgstr.datatype = DTYPE_BINARY; /* ie binary data type */
unsigned char binmsg[] = { 'a', 'b', 'c', '\0', 'a', 'b', 'c', '\0' };
printf("testing binary ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c",
"url": null
} |
star, gravity
We do not know the oblateness values for more than one or two exoplanets and even these are somewhat uncertain, but are thought to be lower than Saturn's value. For example http://adsabs.harvard.edu/abs/2010ApJ...709.1219C
The oblateness of a star depends on the ratio of it gravitational acceleration to ... | {
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"openwebmath_score": null,
"tags": "star, gravity",
"url": null
} |
ros
Title: constraint_aware_simple_arm_server hanging on waitForService environment server at startup
Hello,
I have been using the simple_arm_server on my TurtleBot arm with great success. Just now I tried the constraint aware version using the command:
$ roslaunch turtlebot_arm_bringup constraint_aware_simple_arm_s... | {
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"tags": "ros",
"url": null
} |
general-relativity, gravity, potential-energy, mass-energy, stress-energy-momentum-tensor
q_{x}/c^{2} & \sigma_{xx} & \sigma_{xy} & \sigma_{xz} \\\\
q_{y}/c^{2} & \sigma_{xy} & \sigma_{yy} & \sigma_{yz} \\\\
q_{z}/c^{2} & \sigma_{xz} & \sigma_{yz} & \sigma_{zz}
\end{bmatrix}
$$
Here, $\rho$ is (by definition) the rest... | {
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"openwebmath_score": null,
"tags": "general-relativity, gravity, potential-energy, mass-energy, stress-energy-momentum... |
polymers, plastics
Epoxy has a glass transition due to a loss of crystallinity but is not usually shapeable unless formulated to or poorly prepared. PVA is a thermoplastic that melts around $\pu{200^\circ C}$ which is also the temperature that it starts to pyrolyze and char. With careful temperature control you can ... | {
"domain": "chemistry.stackexchange",
"id": 10418,
"lm_label": null,
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"openwebmath_score": null,
"tags": "polymers, plastics",
"url": null
} |
web site and wrote all the mathematical theory, online exercises, formulas and calculators. And a is basically g however a in this case. It includes information about system configuration, database management, user and run registration, configuration of communications links with other BIS systems, and day to day admini... | {
"domain": "freccezena.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9833429590144717,
"lm_q1q2_score": 0.8798849102566718,
"lm_q2_score": 0.894789454880027,
"openwebmath_perplexity": 1900.9799295418693,
"openwebmath_score": 0.6601222157478333,
"tags": ... |
php, beginner, wordpress
Title: Displaying fields in a sidebar of a custom page template I'm beginning with PHP programming and would appreciate a critique on my code and how I could make it more efficient, rather than repeating the if statements.
What I'm basically doing is getting the fields typed in by the user and... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, beginner, wordpress",
"url": null
} |
rviz, moveit
Originally posted by ahendrix with karma: 47576 on 2014-11-17
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by firebird40 on 2014-11-17:
I'm not trying to make it a part of the upstream package. As you said I can consider creating my own package. That is what I am ... | {
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"tags": "rviz, moveit",
"url": null
} |
$$P=\frac{20!}{10! 20^{10}}\approx 0.0655.$$
- | {
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"lm_q1_score": 0.9919380087100573,
"lm_q1q2_score": 0.8370916217465348,
"lm_q2_score": 0.8438950966654772,
"openwebmath_perplexity": 111.62030939366996,
"openwebmath_score": 0.7714359760284424,
"ta... |
python, python-3.x, email, encryption
def read_encrypted(self, uid):
"""Fetches email from given uid and returns clear text."""
_, email_data = self.imap.uid('fetch', uid, '(RFC822)')
msg = email.message_from_bytes(email_data[0][1])
return self.mailcrypt.decrypt_msg(msg.get_payload(), s... | {
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"id": 37917,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, email, encryption",
"url": null
} |
javascript, library, genetic-algorithm
The naming convention used by JavaScript is camelCase. No library will ever be popular if you use snake_case.
Too much noise. You code is full of unneeded comments (I am excluding he function documentation but referring to the many // comments), redundant declarations and assign... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, library, genetic-algorithm",
"url": null
} |
electromagnetism, electromagnetic-radiation, classical-electrodynamics, dipole, multipole-expansion
violate charge conservation as mentioned in the other answer), which would give a fluctuating electric field that is not an electromagnetic wave. The time-dependent current density, however, can give rise to electromagn... | {
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"openwebmath_score": null,
"tags": "electromagnetism, electromagnetic-radiation, classical-electrodynamics, dipole, mu... |
scala, apache-spark
Here is the details about Header and columnsNameArry for Data frame
LineItem.organizationId|^|LineItem.lineItemId|^|StatementTypeCode|^|LineItemName|^|LocalLanguageLabel|^|FinancialConceptLocal|^|FinancialConceptGlobal|^|IsDimensional|^|InstrumentId|^|LineItemSequence|^|PhysicalMeasureId|^|Financi... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "scala, apache-spark",
"url": null
} |
Inasmuch as $$a_n\ge 0$$ monotonically decreases to $$0$$, and $$\sum_{k=1}^n a_n<\infty$$, we have $$\lim_{n\to\infty }na_n=0$$. Hence, using $$(1)$$, we see that
\begin{align} \lim_{N\to \infty }\sum_{n=1}^N n(a_{n+1}-a_n)&=\lim_{N\to\infty}\left(Na_{N+1}-\sum_{k=1}^N a_k\right)\\\\ &=-\sum_{n=1}^\infty a_n \end{ali... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.971992482639258,
"lm_q1q2_score": 0.8299967748920557,
"lm_q2_score": 0.8539127510928476,
"openwebmath_perplexity": 3053.9799935137767,
"openwebmath_score": 0.9997863173484802,
"tag... |
c++, file-system
//fm["2"] = files[1];
fm += add_data("2", files[1]);
for (size_t i = 0; i < rdata.size(); i++) {
cout << rdata[i] << endl;
}
fm["2"].init_read_write_mode(ReadWriteMode::MULTIPLE);
for (size_t i = 0; i < 100; i++) {
fm["2"].write(&i);
}
//f.init_read_write... | {
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"openwebmath_score": null,
"tags": "c++, file-system",
"url": null
} |
Since there are more variables than equations, Theorem HMVEI applies and tells us that the solution set is infinite. From the proof of Theorem HSC we know that the zero vector is one solution.
M52.
A homogeneous system of 8 equations in 7 variables.
Solution.
By Theorem HSC, we know the system is consistent because... | {
"domain": "runestone.academy",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9932024696568574,
"lm_q1q2_score": 0.8025743567400992,
"lm_q2_score": 0.8080672181749422,
"openwebmath_perplexity": 197.62058196810432,
"openwebmath_score": 0.996325671672821,
"tag... |
python, python-3.x, socket
print(f"{func.__name__} took {t} s (Average: {func.mean_time[0]} s)")
return ret
return wrapper
Which you can use like this in general:
@timeit
def f():
time.sleep(0.1)
for _ in range(10):
f()
# f took 0.1002191620063968 s (Average: 0.1002191620063968 s)
# f took 0.1002... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, socket",
"url": null
} |
javascript
<button id="submit-btn" class="btn btn-primary">Submit</button>
</div>
</div>
</form>
</div>
{{!-- Errors --}}
<div id="myModal" class="modal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="m... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript",
"url": null
} |
data. In statistics, skewness and kurtosis are the measures which tell about the shape of the data distribution or simply, both are numerical methods to analyze the shape of data set unlike, plotting graphs and histograms which are graphical methods. Le test utilise la forme de la distribution de X, telle qu'elle est m... | {
"domain": "kstc.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808718926534,
"lm_q1q2_score": 0.8252255794693648,
"lm_q2_score": 0.8418256472515684,
"openwebmath_perplexity": 1569.546396596111,
"openwebmath_score": 0.7885283827781677,
"tags": null,... |
ros
Title: How can I get acceleration ground truth from VICON?
Dear, ROS people.
I have a question about acceleration ground truth.
We have VICON system which can provide position and angles.
In order to obtain linear acceleration, double differentiation is applied to position data. Computed the acceleration, however... | {
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"tags": "ros",
"url": null
} |
# Looking for a simple proof of the independence of the law of excluded middle
I have seen a number of excellent posts on the difference between intuitionist propositional logic (IPL) and classical propositional logic (CPL), all of which state that IPL is agnostic on the law of excluded middle (LEM) or its equivalent ... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9783846650314325,
"lm_q1q2_score": 0.8215828366765197,
"lm_q2_score": 0.8397339676722393,
"openwebmath_perplexity": 293.6862859550084,
"openwebmath_score": 0.8599395155906677,
"tag... |
electrical-engineering, embedded-systems
Since the interrupt envolves interrupting the existing code to execute something else, and the processor must be able to resume the existing code, some state has to be saved as part of the interrupt mechanism. At the very least, this requires saving the PC (program counter). ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electrical-engineering, embedded-systems",
"url": null
} |
ros, gazebo, simulation, uav, simulator-gazebo
Originally posted by Mike Gao with karma: 108 on 2012-03-05
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by hmmm on 2012-03-06:
sorry,this link doesnt exist
Comment by Ivan Dryanovski on 2012-03-06:
I updated the link, should work... | {
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"tags": "ros, gazebo, simulation, uav, simulator-gazebo",
"url": null
} |
neural-networks, convolutional-neural-networks, comparison
Title: How to make a fair comparison of a convolutional neural network (cNN) vs a mutlilayer perceptron (MLP)? I'm working with deep learning on some EEG data for classification, and I was wondering if there's any systematic/mathematical way to define the arch... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-networks, convolutional-neural-networks, comparison",
"url": null
} |
c#, asp.net-mvc-4
using WebMatrix.WebData;
using Appsomniacs.Web.Filters;
namespace Appsomniacs.Web.Handlers
{
public class BasicAuthorizeAttribute : AuthorizeAttribute
{
protected override bool IsAuthorized(HttpActionContext actionContext)
{
var identity = Thread.CurrentPrincipal... | {
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"tags": "c#, asp.net-mvc-4",
"url": null
} |
### Assumptions
In order to apply Big O notation to express the running time of code, we make the following assumptions on the running times of operations in Java. We assume that the following operations are performed in $$O(1)$$ time:
1. reading, writing, creating, and modifying variables that store primitive data t... | {
"domain": "willrosenbaum.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9949396669177082,
"lm_q1q2_score": 0.8396247161552781,
"lm_q2_score": 0.843895106480586,
"openwebmath_perplexity": 257.12529045384997,
"openwebmath_score": 0.9416604042053223,
"tag... |
electromagnetism, plasma-physics, fusion
Does this help address the concerns about using a spherical container to hold and manipulate plasma for fusion reactors? I think you might still have a problem of plasma leaking from the moving opening. Think of the magnetic containment of the plasma sort of like a balloon:
Int... | {
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"tags": "electromagnetism, plasma-physics, fusion",
"url": null
} |
D) is (number of ways to choose quintuple)(ways to place quadruple)=$5*{5\choose 5} = 5$
Total:$905$.
Total 5 numbers: is $5^5=3125$
A) number of ways all different: $5!=120$
B) number of ways where two are the same: (# values of the pair)(# values of remaining 3)(where to put the pair)(where to put the 3 remaining... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9674102571131691,
"lm_q1q2_score": 0.8352538925930376,
"lm_q2_score": 0.8633916029436189,
"openwebmath_perplexity": 491.8358698161808,
"openwebmath_score": 0.7511948347091675,
"tag... |
game, vba, excel, winapi
If TempMasterGuessArray.ColorFour <> rgbNone Then
If GuessArray.ColorOne = TempMasterGuessArray.ColorFour Then
GuessArray.ColorOne = rgbNone
TempMasterGuessArray.ColorOne = rgbNone
DetermineMatches.MatchesColor = DetermineMatches.MatchesColor + 1
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "game, vba, excel, winapi",
"url": null
} |
magnetic-fields, plasma-physics, fusion
The stellarator on the other hand generates the magnetic field only via magnetic field coils, such that there is no necessity for a strong plasma current. This requires, however, field coils which wind around the torus helically (to achieve the twist in the field lines). On modu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "magnetic-fields, plasma-physics, fusion",
"url": null
} |
gazebo, navigation, ros-melodic, costmap, husky
[ WARN] [1593544034.057914201, 1332.460000000]: local_costmap: Parameter "plugins" not provided, loading pre-Hydro parameters
[ INFO] [1593544034.061554747, 1332.460000000]: local_costmap: Using plugin "obstacle_layer"
[ INFO] [1593544034.063402066, 1332.460000000]: ... | {
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"id": 35208,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, navigation, ros-melodic, costmap, husky",
"url": null
} |
c
return false;
}
void record_preferences(int ranks[]){ // Update preferences given one voter's ranks
for(int i = 0; i < candidate_count; i++){ //Cycle through candidates
for(int j = 0; j < candidate_count; j++){ //Cycle through rank l... | {
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"id": 38847,
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"tags": "c",
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} |
c#, tree
Also, it's usually better not to shorten names to things like nav, those few additional characters will make the code more readable.
if (node == null || navigation.Count == 0)
return node;
I think reaching null node should throw a descriptive exception, not just return null.
if (navigation.Dequeue())
{... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, tree",
"url": null
} |
electromagnetism, magnetic-fields
Title: Why does the µ-H curve of look like this? If we consider a solenoid consisting of a wire coiled around a ferromagnetic core and observe the relationship between $B$ and $H$, we see that as the current through the coil increases, the material enters the saturation at a point whe... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, magnetic-fields",
"url": null
} |
rotational-kinematics, rigid-body-dynamics
Consider the following framework: | {
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"tags": "rotational-kinematics, rigid-body-dynamics",
"url": null
} |
python, security, email, configuration
server = smtplib.SMTP()
def send_email(email_subject, notification_msg, email_recipients):
'''
This functions sends a notification using Email
Args:
email_subject (str) : Email Subject.
notification_msg (str) : Email Body.
... | {
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"id": 22226,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, security, email, configuration",
"url": null
} |
# Ranking a Word Among Its Permutations
#### (A new question of the week)
There are some topics that appear to be standard in certain parts of the world, but far less familiar in our own. Sometimes it takes two of us to recognize what a student is asking, due to language issues and different past experience with such... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9793540734789343,
"lm_q1q2_score": 0.8074401523612984,
"lm_q2_score": 0.824461932846258,
"openwebmath_perplexity": 654.3239127562628,
"openwebmath_score": 0.7690836787223816,
"tag... |
quantum-mechanics, wavefunction, potential, schroedinger-equation, parity
$$H\Psi(x)=E\Psi(x)$$
$$-\frac{\hbar^2}{2m}\frac{d^2\Psi(x)}{dx^2}+V(x) = E\Psi(x)$$
we can do $x\to-x$ in the equation, and so the left hand side remains unchanged (if the potential is an even function of $x$. Therefore, the right hand side sho... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, wavefunction, potential, schroedinger-equation, parity",
"ur... |
Ubuntu
16.10
`ubuntu-16.10`, `latest`
GCC 6.x, Clang 3.9
Ubuntu
16.04
`ubuntu-16.04`
GCC 6.x, Clang 3.8
Debian
sid
`debian-sid`
GCC 6.x, Clang 3.9,4.0
Debian
testing
`debian-testing`
GCC 6.x, Clang 3.9
If you are interested in testing Feel++ in these systems, you can run these flavors.
#### 10.1.5. Con... | {
"domain": "feelpp.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9559813538993888,
"lm_q1q2_score": 0.8163246661246598,
"lm_q2_score": 0.8539127492339909,
"openwebmath_perplexity": 13718.21862802429,
"openwebmath_score": 0.26109886169433594,
"tags": nu... |
programming, qutip
I have tried using different matplotlib backends like TkAgg without any success. I don't know how to fix this problem. I found a solution to my problem here https://github.com/qutip/qutip/issues/1027
Apparently plotting points on the Bloch sphere does not work with Matplotlib v3.1.0.
So I had to dow... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "programming, qutip",
"url": null
} |
image-processing, computer-vision
Since these are the axial images, looking at an individual $(y,x)$ image is like looking through our volume from the top. So, we are looking at $(y,x)$ down through $z$.
To obtain an "X-Ray-like" image of the volume as is, all you have to do is iterate through each $(y,x)$ pixel, get ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "image-processing, computer-vision",
"url": null
} |
classification, feature-selection, correlation, chi-square-test
Title: Chi-Squared test: ok for selecting significant features? I would have a question on the contingency table and its results.
I was performing this analysis on names starting with symbols as a possible feature, getting the following values:
Label ... | {
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"tags": "classification, feature-selection, correlation, chi-square-test",
"url": null... |
c#, fixed-point
while (precision > 0)
{
amount *= 10;
precision--;
}
return (int)Math.Floor(amount);
} Maybe it is intentionally(?):
I would expect CurrencyToInt(234.567m, "USD") to return 23457, but it returns 23456?
Instead of the rather unclear if-statements it ... | {
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ros, mit-ros-pkg
NODES
/
openni_node1 (openni_camera/openni_node)
kinect_base_link (tf/static_transform_publisher)
kinect_base_link1 (tf/static_transform_publisher)
kinect_base_link2 (tf/static_transform_publisher)
kinect_base_link3 (tf/static_transform_publisher)
handdetector (hand_interaction/detectskelhands)
resset... | {
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"id": 8957,
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"openwebmath_score": null,
"tags": "ros, mit-ros-pkg",
"url": null
} |
nice Yeah, but \aleph_n-Lindelöf being useful to Logicians seems to imply something is going on there which I'm not aware of. @AkivaWeinberger Yeah apparently people expected S-spaces and L-spaces to be very symmetric but now it doesn't seem to be the case I think that "least \kappa such that every open cover of X has ... | {
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"lm_q1_score": 0.9833429599907709,
"lm_q1q2_score": 0.839689086749822,
"lm_q2_score": 0.8539127455162773,
"openwebmath_perplexity": 383.8928336469595,
"openwebmath_score": 0.8634619116783142,
"tags... |
ros
As I guess this it not the answer you where hoping for I'd like to suggest another workaround. If you want to publish some data along with the jointstate from one of your nodes to another of your nodes (I guess that's the case as rviz etc. cannot be your target subscriber as they won't "understand" your additional... | {
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"tags": "ros",
"url": null
} |
java, programming-challenge, time-limit-exceeded
return true;
}
I flipped around some of the internal logic. I find an if (false)/else structure confusing. I would rather check truth. And in this case, that also means that we can get rid of the else, as the original else clause finishes with a return (break). ... | {
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"tags": "java, programming-challenge, time-limit-exceeded",
"url": null
} |
acid-base, aqueous-solution, ph
$$
We can see what value this expression approaches as we make the solution more and more dilute by taking the limit as $\Delta V \to \infty$:
$$
\lim_{\Delta V \to \infty} \frac{n_i + (1.0 \cdot 10^{-7}) \cdot \Delta V}{V_i + \Delta V} = 1.0 \cdot 10^{-7}
$$
Therefore, $[\ce{H3O+}]$ te... | {
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"tags": "acid-base, aqueous-solution, ph",
"url": null
} |
black-holes, mass, density, event-horizon, singularities
Title: Why aren't all black holes the same "size"? The center of a black hole is a singularity. By definition, a singularity has infinite density. So how can a black hole with a different mass or density be described? Although we don't have a quantum theory of... | {
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"tags": "black-holes, mass, density, event-horizon, singularities",
"url": null
} |
contrapositive, switch and negate both p and q. Now is a good time to introduce a new definition that occurs in many branches of mathematics and will surely play a role in some of your later courses. Definition of contrapositive. Let's look at another example. English: If there is no traffic on the road then we will ar... | {
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"id": null,
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"lm_q1_score": 0.9390248225478306,
"lm_q1q2_score": 0.8072456058376478,
"lm_q2_score": 0.8596637559030338,
"openwebmath_perplexity": 960.5791287081403,
"openwebmath_score": 0.6792235970497131,
"tags": null... |
python, algorithm, python-2.x, sorting, reinventing-the-wheel
@timeit
def run():
custom_sort()
run()
I have made a function called run() specifically so that @timeit only prints out one line stating how long it took to finish. custom_sort() sorts the numbers in the list for the first four bullets. check_results(... | {
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"tags": "python, algorithm, python-2.x, sorting, reinventing-the-wheel",
"url": null
} |
# Matrix vector form. Is this in the correct form?
I have this question:
Write the linear system $$\begin{array}{rcr}-2x_1+x_2-4x_3 & = & 1 \\ x_1-2x_2 & = & -3 \\ x_1+x_2-4x_3 & = & 0 \end{array}$$ in the matrix-vector form $A\mathbf{x}=\mathbf{b}$.
Is this what they want?
$$x_1* \begin{bmatrix} -2 \\ 1 \\ 1 \end{... | {
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"lm_q2_score": 0.8519528057272543,
"openwebmath_perplexity": 671.318802173384,
"openwebmath_score": 0.756199061870575,
"tags"... |
the-moon, gravity, black-hole, tidal-forces, gravitational-waves
This difference in force tends to pull the Earth into a oval shape with its long axis pointing towards the moon.
But the Earth is also spinning, and this spinning moves the axis of the oval forward, so the oval doesn't point towards the moon, but a littl... | {
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"tags": "the-moon, gravity, black-hole, tidal-forces, gravitational-waves",
"url": null
... |
zoology, taxonomy, phylogenetics
In terms of which tree type is more accepted, it's genetic data by a landslide. Genetic data by and large is much less affected by homologous structures and convergent evolution. In addition, it works on species that all look pretty much identical (imagine trying to code hundreds of ba... | {
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"openwebmath_score": null,
"tags": "zoology, taxonomy, phylogenetics",
"url": null
} |
python, performance, numpy, numba
# Uncomment this line during development to always get the same random
# numbers.
# np.random.seed(1234)
def lsmput(T, r, sigma, K, S0, TimeSteps, paths, k):
dt = T/TimeSteps
t = np.arange(0, T+dt, dt).tolist()
z = np.random.standard_normal(paths)
w = (r-sigma**2/2)*... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, numpy, numba",
"url": null
} |
reinforcement-learning, exploration-exploitation-tradeoff
What is the value of exploitation during training? Intuitively, I would think you would only want to explore during "training" and only exploit in "testing". An algorithm that chooses to always explore during training is unlikely to find an optimal policy becau... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reinforcement-learning, exploration-exploitation-tradeoff",
"url": null
} |
c, linked-list
Is this code looks ok in terms of sort of common C style? Is the behavior of the code undefined? I created a live example of usage here:
LIVE DEMO Style
POSIX reserves type names ending with _t. This means that in the future, standard c may create standardized types with the same name as string_list_no... | {
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"tags": "c, linked-list",
"url": null
} |
moveit
does am i doing right?
it will be great if you suggest me the process of the same in fewer lines.
Comment by Humpelstilzchen on 2016-01-01:
Sorry not sure if I fully understood you. There should be no need to change any of the launch files created by moveit. For real hardware I just use move_group.launch instea... | {
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"tags": "moveit",
"url": null
} |
python, python-3.x, game, rock-paper-scissors
GAME_OPTIONS = ["Rock", "Paper", "Scissors"]
class Game:
def __init__(self, max_score, human_name):
self.max_score = max_score
self.human_name = human_name
self.human_score = 0
self.computer_score = 0
self.running = False
... | {
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"tags": "python, python-3.x, game, rock-paper-scissors",
"url": null
} |
ros-control
read()
2.update()
3.write()
Unfortunately the process crashes soon after the 2.update() command. And only the joint_state_controller gets loaded.
Started ['joint_state_controller'] successfully
Traceback (most recent call last):
File "/opt/ros/indigo/lib/controller_manager/controller_manager", line 65, ... | {
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"tags": "ros-control",
"url": null
} |
rosjava
How to solve it?
Thank you~
Originally posted by sam on ROS Answers with karma: 2570 on 2012-08-15
Post score: 0
Original comments
Comment by KruseT on 2012-08-17:
Please ask only one question at a time, and do not change the question. You need to run gradlew install in rosjava_core first, not rosmake. Never... | {
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Integrating about the contour, we have\begin{align*}\oint\limits_{\mathrm C}\mathrm dz\, f(z) & =\int\limits_0^R\mathrm dx\, f(x)+\int\limits_{\Gamma_R}\mathrm dz\, f(z)+\int\limits_R^0\mathrm dz\, f(z)e^{\pi i/n}\\ & =(1-e^{\pi i/n})\int\limits_0^R\mathrm dx\, f(x)+\int\limits_{\Gamma_R}\mathrm dz\, f(z)\end{align*}
... | {
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"lm_q1q2_score": 0.802439983755971,
"lm_q2_score": 0.8198933381139645,
"openwebmath_perplexity": 744.4927710824176,
"openwebmath_score": 0.976030170917511,
"tags"... |
electromagnetism, water
heating. The heat is provided by the electromagnetic energy flux of
the waves. Thus the Poynting vector of the wave decays as it travels through the
conducting medium; the missing power (per unit volume) is equal to $\sigma E^2$. | {
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"tags": "electromagnetism, water",
"url": null
} |
genetics, human-genetics, population-genetics
QUESTION 1: Are there any systematic reviews about this atypical phenomena? (about "heterozygotic expection")
QUESTION 2: Is there a standard scientific term for this phenomena? You question is a bit unclear, and I think there might be a couple of mistakes in your inequali... | {
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"openwebmath_perplexity": null,
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"tags": "genetics, human-genetics, population-genetics",
"url": null
} |
homework-and-exercises, electrostatics, charge, dielectric
conductive metal sheet between the dielectric 1 and 2. You would have equal and opposite surface charges on the upper and lower surface of the thin metal sheet. Also, the capacitor would have the same capacitance with or without the thin metal sheet. | {
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"tags": "homework-and-exercises, electrostatics, charge, dielectric",
"url": null
} |
# I want to show $E(X)=\sum_{n=1}^\infty P(X\ge n)$
Let $$X:\Omega \to \mathbb N$$ be a random variable on probability space $$(\Omega,\mathcal B,P)$$ .show that $$E(X)=\sum_{n=1}^\infty P(X\ge n).$$
my definition from $$E(X)$$ is equal $$E(X)=\int_\Omega X \, dP.$$
Thanks.
• Hmmm, maybe you want to add that $X\geq... | {
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"lm_q1q2_score": 0.8080666203098715,
"lm_q2_score": 0.8221891261650248,
"openwebmath_perplexity": 483.84613623780353,
"openwebmath_score": 0.986177384853363,
"tag... |
ichthyology, light, aquatic-biology
Additional light can increase growth of algae, which would in turn influence the (very little) ecosystem in an aquarium. On the other hand, I don't think the short bursts of light from photographic flashes introduce enough light to have an impact. Or do they? | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ichthyology, light, aquatic-biology",
"url": null
} |
topology
Title: Are edge states always topological? Hey am new to this forum but I have a question regarding topologically protected states.. Lets suppose we have a 1D gapped system divided two to distinct regions that have different periodicity or different properties and that at the centre, where the two regions 'me... | {
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"openwebmath_score": null,
"tags": "topology",
"url": null
} |
javascript, ecmascript-6, vue.js, jquery-datatables
<body class="dta">
<div id="datatables-admin">
<h1>Datatables admin</h1> | {
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"tags": "javascript, ecmascript-6, vue.js, jquery-datatables",
"url": null
} |
Stephen Tashi
There are no breaks in the graph at the origin so therefore it is continuous there.
The function ##\frac{\sin(x^3 + y^3)}{x + y^2}## is not continuous at ##(0,0)##. Have you studied the definition of "##f(x,y) ## is continuous at ##(a,b)##" ?
i don't understand the "*. *". Comment. This site is not abou... | {
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"lm_q1_score": 0.9603611643025386,
"lm_q1q2_score": 0.8143553018818557,
"lm_q2_score": 0.8479677564567913,
"openwebmath_perplexity": 718.7319749660205,
"openwebmath_score": 0.9307522177696228,
"tag... |
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