text stringlengths 1 1.11k | source dict |
|---|---|
c++, serialization, c++14, factory-method, polymorphism
Use override on overridden methods
When you override a method in a subclass, you should mark it as override so the compiler knows your intent and will warn you if the method signature ever changes in the base class or if you spell it wrong in a subclass. So it wo... | {
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"openwebmath_score": null,
"tags": "c++, serialization, c++14, factory-method, polymorphism",
"url": null
} |
electromagnetism, gauge-theory, vector-fields, gauge-invariance, magnetostatics
Title: What is the importance of vector potential not being unique? For a magnetic field we can have different solutions of its vector potential.
What is the physical aspect of this fact?
I mean, why the nature allows us not to have an u... | {
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"tags": "electromagnetism, gauge-theory, vector-fields, gauge-invariance, magnetostatics",
... |
fluid-mechanics, cad, simulation
Title: Steep gradients spontaneously emerge during convection (discrete approximation) I am learning fluid dynamics, and noticing an odd problem in my computations which I understand, but wouldn't expect, so I would like to know what I'm missing. I feel like it's something silly.
At ti... | {
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"openwebmath_score": null,
"tags": "fluid-mechanics, cad, simulation",
"url": null
} |
node.js, typescript, express.js
if (roles && roles.length) {
for (let role of roles) {
if (userRoles.indexOf(role) !== -1) return next();
}
}
can be transformed to:
if (Array.isArray(roles)) {
for (let role of roles) {
if (userRoles.indexOf(role) !== -1) return next();
}
}
Although I think these chec... | {
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"openwebmath_score": null,
"tags": "node.js, typescript, express.js",
"url": null
} |
electromagnetic-induction
The changing current in the first coil induces an EMF in the second coil. Depending on the attached circuit, a changing current will flow in the second coil, inducing an EMF in the first coil.
If the attached circuit is purely resistive, the current in the 2nd coil will be proportional to th... | {
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"openwebmath_score": null,
"tags": "electromagnetic-induction",
"url": null
} |
machine-learning, neural-network, gradient-descent
where $x_1, x_2,\ldots,x_m$ are the input layer, $h_1, h_2$ are the hidden layer and $\hat y_1, \hat y_2,\ldots \hat y_k$ are the output layer. In the $W^h_{im}$ notation, it represents the weight, where $i$ is representing to which node it's pointing to in the hidden... | {
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"tags": "machine-learning, neural-network, gradient-descent",
"url": null
} |
sql, validation, sql-server, t-sql
END Iterating row by row
Assuming that you want to perform the validations on the files row by row, you shouldn't be using a temporary processed column to keep track of your progress. The feature you should be using is cursors.
DECLARE validator_cursor CURSOR FOR
SELECT PROC_NAM... | {
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"tags": "sql, validation, sql-server, t-sql",
"url": null
} |
and parallel its 4 sides as degree. ( c ) all sides equal in length or 4A, where a is the length of one or. Above quadrilateral family tree works just like x length of one side 4A! Some people call it a rhomb or even a diamond, after the Learn! Rhombus a square are equal and parallel x length of one side or 4A, where i... | {
"domain": "cooperadorsdemataro.coop",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9559813463747182,
"lm_q1q2_score": 0.8125565961510485,
"lm_q2_score": 0.8499711832583695,
"openwebmath_perplexity": 880.0020464963833,
"openwebmath_score": 0.6080847382545... |
eyes, human-eye
What the eye observes once it glances at the retina is a physically constant image of the retina.
In order for the optical feedback loop to work however, the retina image 'in' the mirror would need to be affected by what is projected onto the retina of the observing eye. Since the retina image in the m... | {
"domain": "biology.stackexchange",
"id": 1794,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "eyes, human-eye",
"url": null
} |
microbiology, bacteriology, homework
So even the simplified question of longest optimal doubling time cannot be answered because we don't have the data for so, so many bacteria. The question of the maximum time between divisions is even less clear: there are bacteria that live under conditions of extreme nutritional l... | {
"domain": "biology.stackexchange",
"id": 10126,
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"lm_q2_score": null,
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"tags": "microbiology, bacteriology, homework",
"url": null
} |
php, api, rest
public function getTotalWorkotus(Workout $workout, string $override = null)
{
$mapper = $this->retrieveMapper(get_class($workout), $override);
$mapper->total($workout);
}
/*********************************************************************************************/
/***... | {
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"openwebmath_score": null,
"tags": "php, api, rest",
"url": null
} |
2. Oct 14, 2008
### jacobrhcp
Your book probably has a theorem like this in it:
'if A is a nxm matrix, and E is an mxm elementary matrix (a matrix that is obtained from the identity matrix by only one operation), then multiplication on the left by E is the same operation on A as the operation that was used on the id... | {
"domain": "physicsforums.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9532750387190131,
"lm_q1q2_score": 0.8024913745869396,
"lm_q2_score": 0.8418256452674008,
"openwebmath_perplexity": 125.42394413860917,
"openwebmath_score": 0.9988256692886353,
"ta... |
But I'm not a big fan of the "kets are column vectors, bras are row vectors" approach to bra-ket notation. It will give you the right intuition about bras and kets, but it doesn't explain why the notation still works when the vector space is infinite-dimensional. (See the post I linked to instead).
Last edited: Jan 29... | {
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"lm_q1_score": 0.963779941013992,
"lm_q1q2_score": 0.8133291778377766,
"lm_q2_score": 0.8438951084436077,
"openwebmath_perplexity": 541.4058752269038,
"openwebmath_score": 0.9054941534996033,
"tags... |
bash, console, file-system, perl
print DSConstants::OPERATION_MSG . "\n";
my @all_arguments = @_;
for my $tag_name (@all_arguments) {
my $tag_entry = $list->remove_tag_entry($tag_name);
if ($tag_entry) {
print "Removed \"" . $tag_en... | {
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"openwebmath_score": null,
"tags": "bash, console, file-system, perl",
"url": null
} |
ros, setup.bash, raspberrypi, ros-kinetic
Originally posted by malgudi on ROS Answers with karma: 88 on 2017-01-30
Post score: 0
Original comments
Comment by gvdhoorn on 2017-01-30:
Are you sure the earlier commands completed successfully? If you don't have that file, I fear that you haven't installed ROS at all.
Com... | {
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"tags": "ros, setup.bash, raspberrypi, ros-kinetic",
"url": null
} |
This is a very late answer, but I think that especially Dominique's answer is not very satisfying. So, if $S$ is real, symmetric and positive definite, it is trivially self-adjoint (i.e., $A^* = A$). The square root of $S$ is then usually defined to be the unique positive definite self-adjoint matrix $S^{1/2}$ which sa... | {
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"lm_q2_score": 0.8354835391516133,
"openwebmath_perplexity": 152.0680003525417,
"openwebmath_score": 0.9148877263069153,
"tag... |
homework-and-exercises, electric-circuits, electrical-resistance, electronics
Title: Please tell me how to solve star resistance network
Please tell me how to solve star resistance network
I have tried solving it, but the connection between the crossed resistances is confusing me. Your diagram was (probably quite de... | {
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"tags": "homework-and-exercises, electric-circuits, electrical-resistance, electronics",
... |
The theorem of Katetov mentioned earlier provides a great exercise – for any non-metrizable compact space $X$, determine where the hereditary normality fails. Does it fail in $X$, $X^2$ or $X^3$? This previous post examines a small list of compact non-metrizable spaces. In all the examples in this list, the hereditary ... | {
"domain": "wordpress.com",
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"lm_q1_score": 0.9817357195106374,
"lm_q1q2_score": 0.8049185740550521,
"lm_q2_score": 0.8198933359135361,
"openwebmath_perplexity": 100.52160425469535,
"openwebmath_score": 0.9672622084617615,
"tags":... |
and check to see whether any of them are real', but, of course, finding eigenvectors could be difficult because one has to solve some algebraic equations, possibly of high degree, and that might not be very easy to do. Suppose, though, that $C = XY-YX$ has a nontrivial kernel $K_0\subset\mathbb{R}^n$, which can be comp... | {
"domain": "thekandybshow.com",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992932829917,
"lm_q1q2_score": 0.8493091516215903,
"lm_q2_score": 0.8774767762675405,
"openwebmath_perplexity": 326.5004848723243,
"openwebmath_score": 0.852203905582428,
"tags... |
# Understanding why Hall's marriage theorem $\Leftrightarrow$ Dilworth's theorem
Many books say that Hall's marriage theorem is equivalent to Dilworth's theorem. Some use König's theorem to show that, but many just don't prove it at all.
Is there any simple approach to understand and later prove why this applies usin... | {
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"lm_q1_score": 0.9820137913538826,
"lm_q1q2_score": 0.8005695543159265,
"lm_q2_score": 0.8152324960856175,
"openwebmath_perplexity": 350.3522772530204,
"openwebmath_score": 0.822995662689209,
"tags... |
python, object-oriented, python-3.x, inheritance
#Here I create 3 objects, 2 dogs and 1 cat with selected arguments.
#And check for some methods on the objects.
Mickey = Dog('Mickey', 'Male', 'Bulldog')
Flora = Dog('Flora','Female','Pug')
Tina = Cat('Tina','Female','Persian')
Tina.getallinfo()
Tina.speak('soft')
Dog.g... | {
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"tags": "python, object-oriented, python-3.x, inheritance",
"url": null
} |
Unfortunately, I don't think these sorts of equations will help with your robot project, but perhaps the discussion will engender some good ideas. You can take a look at Paul's Online Notes for more discussion about how lines are represented in three dimensions. He doesn't follow exactly the same approach as I have out... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9683812318188366,
"lm_q1q2_score": 0.8324822399279298,
"lm_q2_score": 0.8596637487122111,
"openwebmath_perplexity": 152.26641470391934,
"openwebmath_score": 0.8917195796966553,
"ta... |
fourier-transform, power-spectral-density
Keeping track of all this for different kinds of signal behaviours quickly become tricky. That is why I made a habit of defining a discrete signal not just by giving a sequence of numbers, but also by providing a homomorphism to an infinite dimensional function space that allo... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fourier-transform, power-spectral-density",
"url": null
} |
electromagnetism, waves, electrical-resistance, maxwell-equations, conductors
$$\gamma = \alpha + j \beta = j \omega \sqrt{\mu \epsilon} \sqrt{1 - j \dfrac{\sigma}{\omega \epsilon}}, \tag{1.52}$$
where $\alpha$ is the attenuation constant and $\beta$ is the phase constant. If we again assume an electric field with onl... | {
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"id": 88315,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "electromagnetism, waves, electrical-resistance, maxwell-equations, conductors",
... |
filters, convolution, linear-systems, impulse-response, filtering
Title: Why does convolution give the output of a passing a signal through a filter? I have a rudimentary understanding of Convolution, the Convolution Theorem and why the output z(t) of an LTI system can be found using the convolution of input signal x(... | {
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"tags": "filters, convolution, linear-systems, impulse-response, filtering",
"url": null
} |
php, mysqli
but then it would be the same as a MySQLi base class. I would instead create a database configuration class and use typehints in construct.
public function __construct(XmysqliConfig $config)
If someone passes something different into your database class, he/she will see an error.
Please remove all your gl... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, mysqli",
"url": null
} |
javascript, jquery, html
$('#allRoseItems').html(roseP);
$('#allTulipItems').html(tulipP);
});
$("#intBrand").trigger("input");
});
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/j... | {
"domain": "codereview.stackexchange",
"id": 30438,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, html",
"url": null
} |
neural-network, deep-learning, training
Title: Should you perform feature scaling/mean normalization when predicting with a model? Should you also perform feature scaling/mean normalization when predicting with a model, that was trained and tested on with feature scaling/mean normalization? Yes, testing data should fo... | {
"domain": "datascience.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-network, deep-learning, training",
"url": null
} |
digital-communications, quantization, information-theory, compression, distortion
I am confused because most material on lossy compression only talks about the rate-distortion theory, without explaining how we can do lossy compression with it. After all, the entire point of lossy compression is to shorten the bitstrea... | {
"domain": "dsp.stackexchange",
"id": 12496,
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"openwebmath_score": null,
"tags": "digital-communications, quantization, information-theory, compression, distortion",
... |
}={ \left\{ {\varnothing,\left\{ 0 \right\},\left\{ 1 \right\},\left\{ {0,1} \right\}} \right\}. Ordered pairs are sometimes referred as $$2-$$tuples. Northeastern University . The concept of ordered pair can be extended to more than two elements. DBMS - Safety of Expressions of Domain and Tuple Relational Calculus. }$... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.96323053709097,
"lm_q1q2_score": 0.8316451658877985,
"lm_q2_score": 0.863391611731321,
"openwebmath_perplexity": 1635.044777521244,
"openwebmath_score": 0.6331157684326172,
"tags": n... |
waves, gravity, mass
Examples of extensive quantities are volume, mass, energy, and entropy. All else equal, the bigger the system you look at, the larger an extensive quantity will be. Examples of intensive quantities are pressure, density, temperature, and specific heat capacity. We can have two systems that have th... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "waves, gravity, mass",
"url": null
} |
inorganic-chemistry, coordination-compounds, transition-metals, hsab
Title: Strongest chloride complex as predicted by HSAB theory Why won't $\ce{Ni^2+}$ form a complex with $\ce{Cl-}$, while the ions $\ce{Cu^2+}$ and $\ce{Co^2+}$ form the complexes $\ce{[CuCl4]^2-}$ and $\ce{[CoCl4]^2-}$?
According to the HSAB theo... | {
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"openwebmath_score": null,
"tags": "inorganic-chemistry, coordination-compounds, transition-metals, hsab",
"url": nu... |
python, strings, iterator
def test():
actual = ''.join(
diff(
main_text=(
"2344586749"
"35346547521456"
"76737887847356"
"2561423"
),
text_with_commentary=(
"2344586749"
"2154... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, strings, iterator",
"url": null
} |
programming, qiskit, quantum-gate, ibm-q-experience
Title: Measuring the accuracy of a circuit output? I have created a circuit and got the output which matches the truth table but, I'm not understanding the measuring the circuit output in terms of the probabilities, power or error.
This is the circuit I tried to crea... | {
"domain": "quantumcomputing.stackexchange",
"id": 2934,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "programming, qiskit, quantum-gate, ibm-q-experience",
"url": null
} |
electromagnetism, magnetic-fields, electric-fields, electromagnetic-induction
Similarly you can use a loop antenna as a receiver (converting magnetic energy to electrical) or as a transmitter (converting electrical energy to magnetic). Neither way is easier, they're just different ways to drive the same physical struc... | {
"domain": "physics.stackexchange",
"id": 99839,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, magnetic-fields, electric-fields, electromagnetic-induction",
... |
electromagnetism, classical-electrodynamics, maxwell-equations, magnetic-monopoles, duality
Magnetic charge is conserved.
Magnetic field lines radiate outwards from positive magnetic charges.
The net force between two magnetic charges moving at constant speed along parallel tracks is less than that between two station... | {
"domain": "physics.stackexchange",
"id": 38649,
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"openwebmath_score": null,
"tags": "electromagnetism, classical-electrodynamics, maxwell-equations, magnetic-monopoles... |
java, console, authentication
if(getUsernamesList().contains(username)){
if(password.equals(getPasswordsList().get(getUsernamesList().indexOf(username)))) return username;
return "-1";
}
return "-1";
}
public void login(Scanner scan){
String username = loginName(scan);
if(username.equa... | {
"domain": "codereview.stackexchange",
"id": 15256,
"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": "java, console, authentication",
"url": null
} |
have more than n eigenvectors with different eigenvalues. and the two vectors given are two linearly independent eigenvectors corresponding to the eigenvalue 1. We recall from our previous experience with repeated eigenvalues of a 2 × 2 system that the eigenvalue can have two linearly independent eigenvectors associate... | {
"domain": "primetro.pl",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9637799472560581,
"lm_q1q2_score": 0.8229839808349535,
"lm_q2_score": 0.8539127455162773,
"openwebmath_perplexity": 388.81582986126205,
"openwebmath_score": 0.906234085559845,
"tags"... |
javascript, jquery, form
}
if(value > 999 && edition === "extreme" && $('#checkMaintenance').is(':checked')) {
var cost = extremeMaintenance[9];
var savings = extremeMaintenanceSavings[9];
} | {
"domain": "codereview.stackexchange",
"id": 4513,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, form",
"url": null
} |
c++, gui, qt
void addButton()
{
++nButtons;
QString label = QString(tr("Page %1")).arg(nButtons);
QPushButton *button = new QPushButton(label, this);
layout->addWidget(button);
signalMapper->setMapping(button, nButtons);
connect(button, SIGNAL(clicked()), signalMap... | {
"domain": "codereview.stackexchange",
"id": 25930,
"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": "c++, gui, qt",
"url": null
} |
c, linked-list, memory-management
struct node *delete_node(struct dl_list **list, struct node *to_die){
if(!to_die->next){
//data == (*list)->tail
return delete_tail(list);
}
else if(!to_die->prev){
//data == (*list)->head
... | {
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"id": 5453,
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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, linked-list, memory-management",
"url": null
} |
algorithms, algorithm-analysis, probability-theory, sets, probabilistic-algorithms
Title: Demonstrating that probability for every possible result is uniform at the end of an algorithm I have memory of $k$ elements that you can imagine being represented by an array. One by one, the array receives a value corresponding... | {
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"tags": "algorithms, algorithm-analysis, probability-theory, sets, probabilistic-algorithms",
... |
electric-current, charge
However, if one was to talk about the free charge density of neutral copper, that would be equivalent to the electron charge density, and therefore would be non-zero.
Yet, for a charged piece of copper, the charge density would clearly be non-zero as there is a net charge across the piece of c... | {
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"id": 79352,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electric-current, charge",
"url": null
} |
particle-physics, electricity, leptons
Title: Could you use Muons as electricity (or rather mutricity)? Muons and electrons are both leptons that carry charge, so could you build a circuit that uses muons instead of electrons? Do substances like copper that conduct electrons also conduct muons? For the purposes of thi... | {
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"tags": "particle-physics, electricity, leptons",
"url": null
} |
beginner, vba
Public Property Get Enums() As Variant
Enums = EnumForString.Items
End Property
Public Property Get Strings() As Variant
Strings = EnumForString.Keys
End Property
The converter is created and used as shown below. As shown it will return a value af 1
Dim converter As MonthConverter
Set converter... | {
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"tags": "beginner, vba",
"url": null
} |
c++, state-machine, sfml, entity-component-system, pong
(void) ecs;
player.destroy();
opponent.destroy();
ball.destroy();
border.destroy();
scoreboard.destroy();
};
void update(const Time::Duration& timestep) override {
(void) timestep;
... | {
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"tags": "c++, state-machine, sfml, entity-component-system, pong",
"url": null
} |
c#, winforms, wpf, rubberduck
public FindSymbolViewModel(IEnumerable<Declaration> declarations, SearchResultIconCache cache)
{
_declarations = declarations;
_cache = cache;
var initialResults = _declarations
.Where(declaration => !ExcludedTypes.Contains(decla... | {
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"tags": "c#, winforms, wpf, rubberduck",
"url": null
} |
exoplanet, data-analysis
source
This means that you cannot directly estimate the exoplanet mass from your radial velocity data, only $M \sin i$, as plotted on your histogram. $M \sin i$ is a lower limit to the mass.
The $M_{\rm Jup}$ is there to indicate that the axis is labelled in units of Jupiter masses. | {
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} |
python, parsing, recursion, xml, scrapy
for subsubcontainer in subcontainer.xpath("./div/div"):
subsubcategory = get_category(subsubcontainer)
for subsubsubcontainer in subcontainer.xpath("./div/div"):
subsubsubcategory = get_category(subsubsubcontainer)
subsub... | {
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"id": 43751,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, parsing, recursion, xml, scrapy",
"url": null
} |
quantum-field-theory, path-integral, fermions, grassmann-numbers
I'm not sure how the above only applies to coherent states, I thought that it would work for any set of Grassmann variables.
The book then does a calculation for a Gaussian integral and finds that the generating functional for fermions is
$$ Z\left[ \b... | {
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"tags": "quantum-field-theory, path-integral, fermions, grassmann-numbers",
"url": null
} |
graphs, reference-request, trees
Title: Induced subgraph problem in trees Let $~G~$ be unweighted unordered tree. I have some number of pairs of this tree's vertices $~(u_1, v_1), \dots, (u_n, v_n)$. I need to construct a smallest subgraph of original tree such that for each pair $~(u_i, v_i)~$ there is path connectin... | {
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"openwebmath_score": null,
"tags": "graphs, reference-request, trees",
"url": null
} |
statistical-mechanics
Title: Temperature as measure of average KE of molecules This was asked to me in a Physics PhD interview. We suppose that a river is flowing, with its water in the middle flowing at much higher speed than that of the waters near the banks. If temperature is a measure of average KE of molecules, s... | {
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"tags": "statistical-mechanics",
"url": null
} |
javascript, node.js
function checkInternet(callback) {
var servers = ['a.root-servers.net', 'b.root-servers.net'],
lookup = require('dns').lookup,
complete = false, doneCnt = 0; | {
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"openwebmath_score": null,
"tags": "javascript, node.js",
"url": null
} |
python, tkinter
# Styling the tabs
s = ttk.Style()
s.theme_create('pastel', settings={
".": {
"configure": {
"background": '#ffffff', # All except tabs
"font": 'red'
}
},
"TNotebook": {
... | {
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"openwebmath_score": null,
"tags": "python, tkinter",
"url": null
} |
c#
class MsFormReader : IMsFormReader { ... }
And then use it for parsing:
//split the document into smaller logical blocks
class FormHeader
{
public byte MinorVersion { get; }
public byte MajorVersion { get; }
public uint DataSize { get; }
public void Read(IMsFormReader reader)
{
MinorVe... | {
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"tags": "c#",
"url": null
} |
quantum-field-theory, mathematical-physics, symmetry, group-theory, quantization
Yes, this works for the relativistic spinning particle and the Dirac equation, too. Here the translation symmetry on the worldline is refined to translation supersymmetry (for ordinary spinors even, this has nothing a priori to do with sp... | {
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"tags": "quantum-field-theory, mathematical-physics, symmetry, group-theory, quantization",
... |
ros, ros2, colcon, qt5, ros-crystal
Originally posted by uPrizZ on ROS Answers with karma: 31 on 2019-02-28
Post score: 1
Answer was to make use of Qt5's windeployqt feature. Setup cmd to find windeployqt (i.e. extend PATH by your Qt5 path)
and then do
"windeployqt /install/Lib//.exe"
which will create all necessary ... | {
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"tags": "ros, ros2, colcon, qt5, ros-crystal",
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} |
performance, sql, sql-server, xml, xpath
select C.CaseId,
C.CaseName,
M.X.value('(MaterialName/text())[1]', 'nvarchar(4000)') as PartNumber,
A.X.value('(Name/text())[1]', 'nvarchar(4000)') as NodeName,
A.X.value('(Value/text())[1]', 'nvarchar(4000)') as Value
into #New
from dbo.Cases as C
... | {
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"openwebmath_score": null,
"tags": "performance, sql, sql-server, xml, xpath",
"url": null
} |
turing-machines, automata, finite-automata, undecidability
and transition function δ is as follows:
δ (q1, U) = (q1, U, R)
δ (q1, 0) = (q2, U, R)
δ (q1, 1) = (q2, U, R)
δ (q2, U) = (qaccept, U, R) δ (q2, 0) = (q1, U, R)
δ (q2, 1) = (q1, U, R)
is L Turing - decidable? From what I know, a language L is turing decidable... | {
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"tags": "turing-machines, automata, finite-automata, undecidability",
"url": null
} |
spacetime, satellites
Title: Voyager Golden Record Has there been any subsequent researches or any respond from deep outer space in any type of form with these images and sounds? No. Both Voyager I and II continue to actively transmit data and continue undisturbed on their trajectories. If someone or something found t... | {
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"tags": "spacetime, satellites",
"url": null
} |
on rectangular domains mit18086 navierstokes. Either approach requires O(N2 logN) ops for a 2D Poisson equation, and is easily generalized to Poisson-like equations in rectangular boxes in three or dimensions. This has known solution. I use center difference for the second order derivative. Moreover, the equation appea... | {
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"lm_q1_score": 0.9923043521388583,
"lm_q1q2_score": 0.8225595892508525,
"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 603.9435741108301,
"openwebmath_score": 0.814243495464325,
"tags"... |
python, python-3.x, interview-questions, mathematics, integer
Having been able to successfully prove this, afterwards I then went on to implement, in Python, a program which can express any positive integer in terms of the sum of different charming numbers.
To do this I start by converting the integer into base 3 so t... | {
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"tags": "python, python-3.x, interview-questions, mathematics, integer",
"url": null
} |
gazebo
SUMMARY
========
PARAMETERS
* /bumper2pointcloud/pointcloud_radius: 0.24
* /cmd_vel_mux/yaml_cfg_file: /opt/ros/kinetic/...
* /depthimage_to_laserscan/output_frame_id: /camera_depth_frame
* /depthimage_to_laserscan/range_min: 0.45
* /depthimage_to_laserscan/scan_height: 10
* /robot_description: <?xml ver... | {
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} |
Finite Difference Method Example | {
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"openwebmath_score": 0.5503965616226196,
"tags": nul... |
php, sql, mysql, json, join
"content": "this is some text from post",
"created": "2017-09-24 16:29:53",
"edited": null,
"categories": [{
"id": 5,
"icon": 'www.url.com',
"name": 'category name'
}, {
"id": 3,
"icon": 'www.url1.com',
"name": 'category6 name'
}]
}
... | {
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"openwebmath_score": null,
"tags": "php, sql, mysql, json, join",
"url": null
} |
java, object-oriented
Title: Collision detection implementation I'm working on a clone of Hunter Story. You shoot monsters with your bow. Recently I implemented collision detection, this is all working correctly, and I don't think the code needs any dramatic optimisations. The only thing I'm a bit worried about is how... | {
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"openwebmath_score": null,
"tags": "java, object-oriented",
"url": null
} |
performance, sorting, common-lisp
Title: Sort 3 numbers in Common Lisp with the minimum number of operations I’m wondering is the following function returns a list of three numbers sorted in ascending order with the minimum possible number of operations, or if there is some more efficient or elegant method (a part fro... | {
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"openwebmath_score": null,
"tags": "performance, sorting, common-lisp",
"url": null
} |
python, console
# Extract the subcommand name (convert hyphens/dashes to underscores)
subcommand_name = args.subcommand_name.replace('-', '_')
# Get the corresponding function object
func = self.commands[subcommand_name]
# Get the argument specification object of the function
... | {
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"tags": "python, console",
"url": null
} |
c#, programming-challenge, recursion, reinventing-the-wheel, calculator
My Solution
I have decided to use the hyperoperation (Wikipedia Link). The only arithmic operator used is in the first branch (if (n == 0) -> b + 1).
$$ H_n(a,b) = a[n]b =
\begin{cases}
b + 1 & \text{if } n = 0 \\
... | {
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"tags": "c#, programming-challenge, recursion, reinventing-the-wheel, calculator",
"ur... |
programming-challenge, state-machine, j
Expected Output:
1 3 N
5 1 E
This is my working solution:
dirs =: 'NESW'
input =. _4]\ 2 }. '' cut (' ',LF) charsub fread '~/Desktop/marsrover.txt'
NB. State transitions are the directions rotated forward and backwards
st =. 0,."1~ (] ,. 1 |. ] ,. _2 |. ]) i. # dirs
NB. R =... | {
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electrostatics
Title: Electrostatics - System of parallel plates For a system of $n$ parallel metal plates bearing charges $q_1, q_2,\dots, q_n$, why it is so that the facing surfaces of the plates bear equal and opposite charges?
How do we prove that? This is the direct consequence of gauss law.Consider a cuboidal ga... | {
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"tags": "electrostatics",
"url": null
} |
quantum-mechanics, general-relativity, black-holes, gravitational-waves
Gravitational waves are disturbances in the curvature of spacetime, generated by accelerated masses, that propagate as waves outward from their source at the speed of light.On 11 February 2016, the LIGO and Virgo Scientific Collaboration announced... | {
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"tags": "quantum-mechanics, general-relativity, black-holes, gravitational-waves",
"url":... |
newtonian-mechanics, rotational-dynamics
Title: Dynamics of unscrewing I'm trying to formulate mathematical model of a nut on screw dynamics. Let's consider nut (with inertia $I_n$ and mass $m_n$) on a screw (with inertia $I_s$) - both rotating with constant angular velocity $\omega_0$ about the vertical axis ($y$). T... | {
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"tags": "newtonian-mechanics, rotational-dynamics",
"url": null
} |
which can be rewritten as follows
$$\begin{array}{ll} \text{minimize} & t\\ \text{subject to} & -t 1_m \leq \mathrm A \mathrm x - \mathrm b \leq t 1_m\end{array}$$
where the optimal $\rm x$ and the optimal $t$ are the minimizer and the minimum of the original problem, respectively. | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9780517475646369,
"lm_q1q2_score": 0.8462339158024472,
"lm_q2_score": 0.865224072151174,
"openwebmath_perplexity": 485.1442327678613,
"openwebmath_score": 0.880108654499054,
"tags"... |
ros, beginner
Originally posted by ryanmcintosh5 on ROS Answers with karma: 31 on 2014-01-09
Post score: 3
Any answer you'll get will be highly opinion-based. Also as the question is very open in this format I will focus on the ROS question, i.e.: If I can't program C++, nor program at all yet, is it wise to start wi... | {
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"id": 16622,
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"tags": "ros, beginner",
"url": null
} |
javascript, performance, algorithm, strings, edit-distance
Title: A String.prototype.diff() implementation (text diff) I just had the idea to develop an algorithm to calculate and highlight the difference between two strings. I know that there are already some libraries to do the job but I just tried to make my own. I... | {
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"id": 20769,
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"tags": "javascript, performance, algorithm, strings, edit-distance",
"url": null
} |
memory-management, virtual-memory, memory-allocation
That's not a bad idea. It's been proposed before and studied in considerable depth. It does add some robustness against bugs. It can also make buffer overrun attacks harder, especially if you randomize the location of all heap buffers. It's also relatively easy ... | {
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"id": 7078,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "memory-management, virtual-memory, memory-allocation",
"url": null
} |
c++, functional-programming
Avoid Globals
You have testData as a global. This makes all the functions that access it decidedly non-functional. setPositive and setNegative confused me for a while, as they take a vector<Person> as input but don't actually use it as input. This would make more sense:
std::vector<Person> ... | {
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"tags": "c++, functional-programming",
"url": null
} |
python, performance, python-3.x, gui, pyqt
@classmethod
def fake_rows(cls) -> Iterable['Song']:
return (
cls('Weird Al Yankovic', 'Running with Scissors', 'Pretty Fly for a Rabbi'),
cls('Weird Al Yankovic', 'Running with Scissors', 'Albuquerque'),
cls('Weird Al Yankovic'... | {
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"tags": "python, performance, python-3.x, gui, pyqt",
"url": null
} |
moveit
If this list doesn't include a plugin for SBPL, then you won't be able to get it to work with the rest of MoveIt, no matter what you put in the launch files. | {
"domain": "robotics.stackexchange",
"id": 13919,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "moveit",
"url": null
} |
exercises, formulas and calculators angle! = 7 for their slopes are m, 2 Quiz Solving Absolute value equations Order... Lines are parallel if their slopes this web site and wrote all the mathematical theory, online,... Y axis and a line with a slope of m = - 8 Trinomials Quiz Solving Absolute equations! Is 2x 2 – 7xy +... | {
"domain": "anekdoty.pro",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9597620539235895,
"lm_q1q2_score": 0.8079523160603777,
"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 579.0480748319139,
"openwebmath_score": 0.5522934198379517,
"tags... |
You could also show this manually: let $$\mu_j = \frac{1}{N+1}$$ for each $$j \in \{0,1,\ldots,N\}$$. Then $$(P \mu)_j = p \mu_{j-1} + r \mu_{j} + q \mu_{j+1} = \frac{p + r + q}{N+1} = \frac{1}{N+1} = \mu_j$$
where the indices are $$\mod{N+1}$$.
EDIT: some further comment on the invariance thing; let $$A$$ be the map... | {
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"lm_q1_score": 0.9805806523850542,
"lm_q1q2_score": 0.8171419732900748,
"lm_q2_score": 0.8333245932423309,
"openwebmath_perplexity": 254.98908889874744,
"openwebmath_score": 0.9716159701347351,
"ta... |
electromagnetism, energy-conservation, superconductivity, dissipation, perpetual-motion
In reality, however, there are always losses and in your example induced eddy currents in the metal and radio emissions from the superconductor are two them, even if you are content to watch it oscillate back and forth for all eter... | {
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"tags": "electromagnetism, energy-conservation, superconductivity, dissipation, perpetual-m... |
electrostatics, charge, capacitance, electronics, dielectric
Title: Main cause of self-charging of unshorted capacitors? In the lab, we keep all of the high voltage capacitors shorted when not in use, and rightfully so. They tend to spontaneously charge when left for some time and become extremely dangerous. while the... | {
"domain": "physics.stackexchange",
"id": 91258,
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"openwebmath_score": null,
"tags": "electrostatics, charge, capacitance, electronics, dielectric",
"url": null
} |
$$I^{\prime }(t)=\left( \dfrac{\partial }{\partial t}\displaystyle\int_{u}^{v}f\left( x,t\right) dx\right) \dfrac{dt}{dt}+\left( \dfrac{\partial }{\partial v}\displaystyle\int_{u}^{v}f\left( x,t\right) dx\right) \dfrac{dv\left( t\right) }{dt}+\left( \dfrac{\partial }{\partial u}\displaystyle\int_{u}^{v}f\left( x,t\righ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9891815532606978,
"lm_q1q2_score": 0.8155425332039468,
"lm_q2_score": 0.8244619306896955,
"openwebmath_perplexity": 600.395962371277,
"openwebmath_score": 0.9197989106178284,
"tags... |
neural-networks, comparison, genetic-algorithms, genetic-programming
I am particularly interested in the protein structure prediction problem.
There might be a role for GA or GP algorithms in searching for solutions to this problem. However, trying to frame the entire search as GA or GP is not practical. Instead a GA... | {
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"id": 4128,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-networks, comparison, genetic-algorithms, genetic-programming",
"url": null
} |
java, parsing, state
public static List<MatchReplacePair> readRegexesFromFile(File file) {
List<MatchReplacePair> list = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader(file))) {
String line = br.readLine();
int state = SEPARATOR_EXPECTED;
MatchReplacePair ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, parsing, state",
"url": null
} |
energy, particle-physics, laser
Edit: @QuantumAI, I somehow didn't see your answer when I wrote mine. | {
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"id": 32759,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "energy, particle-physics, laser",
"url": null
} |
With the solution, can the answerer also add what came to his mind when he looked at the integral, in the sense of how did he think to approach this problem?
There must obviously be some features of this expression that more experienced people can see and hence can guess the method which might work. I want to know wha... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9865717432839349,
"lm_q1q2_score": 0.8042853470593003,
"lm_q2_score": 0.8152324983301568,
"openwebmath_perplexity": 441.2090338295384,
"openwebmath_score": 0.9525039196014404,
"tag... |
experimental-physics, vectors, geometry
to the wire; also a resonance frequency. It quickly goes down in an angular fashion both w.r.t. the in-plane angle and the out-of-plane angle. My task is then, with these tools in hand, to align the magnetic field parallel to the wire. | {
"domain": "physics.stackexchange",
"id": 45537,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "experimental-physics, vectors, geometry",
"url": null
} |
using MATLAB: LQR optimal control, H-infinity optimal control and output feedback projective control, so that the aircraft’s. On slide 7, the author says "in binary classification we can map only from the input to the feature space. I remember, it took the little computer the whole night to produce the chart. Search thi... | {
"domain": "eccellent.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759610129463,
"lm_q1q2_score": 0.8042136637923,
"lm_q2_score": 0.819893335913536,
"openwebmath_perplexity": 1483.599632833718,
"openwebmath_score": 0.6984260678291321,
"tags": null,... |
cmake
As for cross platform support it's difficult to say without trying it on multiple platforms. I'm not sure about your find_path call. The use of ${Qt5Core_INCLUDE_DIRS} should be portable enough but it's tough to say.
One other nuance with find modules that I personally find can be troublesome is that on windows... | {
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"id": 34074,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cmake",
"url": null
} |
rule, power of a fraction rule, zero exponent, negative exponent, fractional exponent When using the product rule, different terms with the same bases are … If you can write it with an exponents, you probably can apply the power rule. raising to a power multiplication of the same denominator for example, the positive a... | {
"domain": "com.br",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9643214511730025,
"lm_q1q2_score": 0.8014890720597628,
"lm_q2_score": 0.8311430499496096,
"openwebmath_perplexity": 669.6546270847958,
"openwebmath_score": 0.8276767730712891,
"tags": null,
... |
reinforcement-learning, ai-design, multi-agent-systems
In practice, if you only have a small number of agents and have options that take relatively large amounts of time, you don't have to actually loop through all primitive time-steps. You could, for example, compute the primitive timestamps at which "events" should ... | {
"domain": "ai.stackexchange",
"id": 1407,
"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": "reinforcement-learning, ai-design, multi-agent-systems",
"url": null
} |
python, programming-challenge, graph
Note: Sometimes the single degree vertices may appear in pair like 1-2 then while pop(ping) it has already been removed so no need to update in last.
Code:
Please see Codeforces 192B for input description which is basically n(number of nodes), m(number of edges) and next m lines t... | {
"domain": "codereview.stackexchange",
"id": 21023,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "python, programming-challenge, graph",
"url": null
} |
The answer will depend on what is known of the shape. If you know only the number of faces, or only the number of vertices, then you cannot work out the number of edges. An icosahedron is a polyhedron with 20 faces. The number of vertices and edges is indeterminate because there are many possible configurations.
x is ... | {
"domain": "moethebutcher.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.962673111584966,
"lm_q1q2_score": 0.812395120447999,
"lm_q2_score": 0.8438950986284991,
"openwebmath_perplexity": 308.77009254422484,
"openwebmath_score": 0.552740752696991,
"tags"... |
reference-request, ho.history-overview, online-algorithms
Title: Searching for the original definition of online algorithms I'm currently searching for the original formal definition of online algorithms. The earliest mentions of online algorithms that I found are from the mid 80s. But none of these papers seem to be ... | {
"domain": "cstheory.stackexchange",
"id": 4252,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reference-request, ho.history-overview, online-algorithms",
"url": null
} |
javascript, database, graph, wrapper, rest
getAllRelations: function (callback) {
var connection = this;
this.query("START r=rel(*) RETURN r", function (nodes) {
$.each(nodes['data'], function (i, val) {
callback(new Relation(connection, val[0]));
});
});... | {
"domain": "codereview.stackexchange",
"id": 7635,
"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": "javascript, database, graph, wrapper, rest",
"url": null
} |
nuclear-physics, astrophysics, neutrinos, sun, stellar-physics
Title: Are the muon/tau neutrinos produced in the Sun? If not, then where? I was reading about Solar Neutrinos, and apparently they are all Electron Neutrinos.
However, there are two other types of neutrinos, the Muon and Tau Neutrinos. Does the Sun produc... | {
"domain": "physics.stackexchange",
"id": 63899,
"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": "nuclear-physics, astrophysics, neutrinos, sun, stellar-physics",
"url": null
} |
homework-and-exercises, classical-mechanics, harmonic-oscillator, coupled-oscillators, normal-modes
\begin{align}
&\ddot{r} = -\omega_0^2r - \omega_c \dot{\theta} r\\
&\frac{d}{dt} \left( \frac{-q B_0}{2c} r^2 \right) = 0\\
&\ddot{z} = -\omega_0^2 z
\end{align}
for $\omega_c = \frac{q B_0}{m c}$, where we can clearly ... | {
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"id": 68374,
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"openwebmath_score": null,
"tags": "homework-and-exercises, classical-mechanics, harmonic-oscillator, coupled-oscillat... |
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