text stringlengths 1 1.11k | source dict |
|---|---|
long would it take for the mass to decay to 40 mg? Exponential Growth and Decay Word Problems ∗ Growth = Decay = Write and d) Write an exponential function to model the situation: e) “Do” the problem: 2. 5% interest rate compounded annually. Exponential+Growthand+DecayWord+Problems+!! 4. Exponential Growth and Decay Ex... | {
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... |
The code uses that the 4 numbers are increasing in size. Starting from the largest possible number to be part of the sequence, and sees if it is possible to find a solution with that. Doing this recursively from 4 to 3 to 2 numbers, stopping whenever it has gone over the threshold or no solution is possible.
Equation ... | {
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"tags":... |
material-science
The typical tension in a spoke is set to at least 80 kg (800 N) according to this article which looks like it knows what it is talking about. Again, using 195 GPa and 2 mm diameter for the spokes, that would result in a strain of
$$\frac{800}{\pi\cdot 0.001^2 \cdot 195\cdot 10^9~0.0013}$$
That is equ... | {
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"tags": "material-science",
"url": null
} |
fft, filters, frequency-spectrum, convolution
So there are clearly infinitely many ideal filters satisfying $(1)$. Just choose a filter with an arbitrary number of passbands with gain $1$ (and arbitrary edge frequencies), and ideal stopbands with gain $0$.
Note that apart from the trivial filters $H(\omega)=0$ and $H(... | {
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"tags": "fft, filters, frequency-spectrum, convolution",
"url": null
} |
c++, reinventing-the-wheel, memory-management
[[nodiscard]] std::size_t get_flags(const Chunk* chunk) const noexcept {
assert(chunk);
return chunk->size_ & CHUNK_FLAG_MASK;
}
void set_flags(Chunk* chunk, std::size_t flags) {
assert(chunk && chunk != top_chunk_);
chunk->size_ &=... | {
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"tags": "c++, reinventing-the-wheel, memory-management",
"url": null
} |
neuroscience, bioinformatics, literature, computational-model, electrical-stimulation
and Measuring and interpreting neural correlations by Cohen and Kohn.
For a review on population codes, see Information processing with population codes by Pouget et al.
This notion is sort of orthogonal to the notion of sparse codin... | {
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"tags": "neuroscience, bioinformatics, literature, computational-model, electrical-stimulati... |
civil-engineering, geotechnical-engineering, rail, tunnels
If you look at the long section of the tunnel there is some high ground on both coasts. The width of the high ground on the French side is about 2 to 3 km, whereas on the English side the width about 7 to 8 km.
For reasons of maintaining a comfortable gradient... | {
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"tags": "civil-engineering, geotechnical-engineering, rail, tunnels",
"url": null
} |
ros, moveit, ros-melodic, ik
Title: Incorrect/unexpected behavior from Trac-IK with calls to moveit::core::RobotState::setFromIK
I just switched to Melodic from Kinetic (yay!) and some of our existing code base started generating infeasible trajectories (nooo!). Upon further inspection it seems that RobotState's set... | {
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"tags": "ros, moveit, ros-melodic, ik",
"url": null
} |
the volume of a sphere. What is the difference between the height of a cone and the slant height of a Solving Real-World Word Problems Involving Volume Overview Number of instructional days: 5 (1 day = 45–60 minutes) Content to be learned Mathematical practices to be integrated • Understand the relationship between a c... | {
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"openwebmath_score": 0.6182653903961182,
... |
quantum-mechanics, double-slit-experiment, quantum-eraser
Here is the answer: https://physics.stackexchange.com/a/214926/101743
To summarise my understanding: the x-position on D0 is really a measurement of the initial phase difference between the two paths. This phase difference is also what is filtered on for the D1... | {
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"tags": "quantum-mechanics, double-slit-experiment, quantum-eraser",
"url": null
} |
this browser for the next time i comment were proved called... Cyclic quadrilaterals - Get Get topics notes, Online test, video lectures.... Locations of point R are on line l a side of OE prove that perpendicular. Intersect each other then it is both tangential and cyclic 3 Geometry Class 10 Maths Chapter... H are tou... | {
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"lm_q2_score": 0.8872045922259089,
"openwebmath_perplexity": 3650.9566282298897,
"openwebmath_score": 0.47614631056785583,
"t... |
visible-light, electromagnetic-radiation
Title: How to interpret the radiant intensity equation? I would like to understand, what radiant intensity means. The equation is:
$$ I_{\mathrm{e},\Omega} = \frac{\partial \phi_\mathrm{e}}{\partial \Omega} $$
Where $ \phi_\mathrm{e} $ is the radiant flux emitted, reflected, tr... | {
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"tags": "visible-light, electromagnetic-radiation",
"url": null
} |
with a fibrous reinforcing dispersed phase. In a broader sense, it is adequate that the former be a subset of the latter. Understand the relationship between matrix products and compositions of matrix transformations. 1 COMPOSITION OF RELATIONS 1 Composition of Relations In this section we will study what is meant by c... | {
"domain": "poulabs.com",
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"openwebmath_score": 0.8502169847488403,
"tags"... |
c, linked-list
return head;
}
node *delete_at(node *head, int pos){
int count=count_node(head);
if(head==NULL){
printf("no head exist");
return 0;
}
while (count<pos)
{
printf("choose %d positions to delete. choose again", count); scanf("%d", &pos);
} | {
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"tags": "c, linked-list",
"url": null
} |
javascript, image
if( cOptions.captions ) {
DietySlider.insertImageCaption(cSettings);
}
},
insertImageCaption: function(cSettings) {
var title_div = slider.querySelector('.deity-title');
var title_text = cSettings.images[cSe... | {
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"openwebmath_score": null,
"tags": "javascript, image",
"url": null
} |
energy, entropy, discrete
With this setup, we could write a simulation where $u_i$ is constant (constant internal energy), and where the number densities evolve from $n_i=[0,0,5,0,0]$ to $n_i=[1,1,1,1,1]$. We have:
$S_{\text{initial}}=S(u,dx,5)=5 dx(\log(u^{1/2}-\log(5)+\xi')$,
$S_{\text{final}}=5S(u,dx,1)=5 dx(\log(u... | {
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"tags": "energy, entropy, discrete",
"url": null
} |
functional-programming, scala, immutability
override protected def getBuilderInstance(): SearchQueryBuilder = this
override def build(): SearchQuery = if (query.isDefined) SearchQuery(query.get, qualifiers.toMap, parameters.toMap)
else throw new IllegalStateException("Query Str... | {
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"tags": "functional-programming, scala, immutability",
"url": null
} |
vba, excel
End Sub | {
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"tags": "vba, excel",
"url": null
} |
here is my problem_
y = x^2 + 4x - 9
----------
...
here some more problems_( i know these will be on a test)
y = x^2 - 6x + 16
y = x^2 - 8x - 1
y = x^2 + 5x + 2
thanks
Hello,
with all your problems you have to do the following steps:
If the factor before x^2 is 1 (as it is with your problems) you can calculate a co... | {
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"openwebmath_score": 0.8848561644554138,
"tags... |
java, strings, regex, io
Now you have the complete poem in a single variable poem.
Now, a paragraph is identified by an empty line (or more) between texts. In Regex terms, this is two or more newlines and other whitespace:
private static final Pattern PARAGRAPH = Pattern.compile("\\s*^\\s*$\\s*", Pattern.MULTILINE);
... | {
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"tags": "java, strings, regex, io",
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} |
object-oriented, design-patterns, typescript, classes
OOP is not necessary here
OOP's goals and purposes certainly are. And SOLID, as a nemonic, certainly does not encapsulate near the entirety of OOP principles and practice.
It is hard to fully appreciate the revolution that is OOP without having experienced a compl... | {
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"tags": "object-oriented, design-patterns, typescript, classes",
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} |
newtonian-mechanics, point-particles
The same is true for charge. When far away from the dimensions of the charge which produces the electric field, the center of mass is a very good approximation. When one works close to the charged bodies one has to integrate over charge distributions. Electromagnetism though is a s... | {
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"tags": "newtonian-mechanics, point-particles",
"url": null
} |
K’s VARIATION
K understood the proof, and then asked a question I hadn’t thought to ask. Why did we have to multiply by r? Could multiplication by $r^2$ also determine the summation formula?
I had three nearly simultaneous thoughts followed quickly by a fourth. First, why hadn’t I ever thought to ask that? Second... | {
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"openwebmath_score": 0.8198376893997192,
"tags":... |
python, javascript, performance, python-3.x
else:
escape = flag + 1
return output
where data is a byte string read in from a file opened in binary mode. My code and the original code both produce the same output, but where the original code takes only a few seconds to execute, mine takes ~10 minutes ... | {
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"tags": "python, javascript, performance, python-3.x",
"url": null
} |
lagrangian-formalism, field-theory, interactions
Title: How do $\phi^4$ terms result in an interacting (classical) field? It was my understanding that a scalar field, $\phi(t;\vec{x})$, varying in time and parametrised by position, was 'non-interacting' if the field evaluated at one point affected the field evaluated ... | {
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"id": 39316,
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"openwebmath_score": null,
"tags": "lagrangian-formalism, field-theory, interactions",
"url": null
} |
earth, measurements, curvature
Naturally, this led to attacks from commenters saying how stupid he is. What was interesting is that, despite it being more rational to believe that that the earth is indeed round from observations such as looking at the curvature of the horizon through a plane window or noticing the di... | {
"domain": "physics.stackexchange",
"id": 42236,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "earth, measurements, curvature",
"url": null
} |
organic-chemistry, reaction-mechanism, amines, regioselectivity
This is important as in your case, if the substituent $\ce{X}$ is $\ce{H}$, then depending on the solvent, as much as 89% of it may exist in the quinoid form ($\bf{2}$).
References:
Satoshi Kishimoto, Shinya Kitahara, Osamu Manabe, Hachiro Hiyama, “Studi... | {
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"tags": "organic-chemistry, reaction-mechanism, amines, regioselectivity",
"url": null
... |
homework-and-exercises, quantum-field-theory, special-relativity, scattering
Title: I do not understand this bra-ket notation equality for BCFW recursion Background:
When learning about BCFW recursion I am shown the deformation equation:
$$\hat{p_1}=p_1 -zq \hspace{5mm}; \hspace{5mm} \hat{p_n} = p_n +zq$$
This deform... | {
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"tags": "homework-and-exercises, quantum-field-theory, special-relativity, scattering",
"... |
rostest, turtlesim
Type: turtlesim/Color
Publishers: * /turtlesim/turtlesim_node (http://jsf-p-desktop:55631/)
Subscribers: * /turtlesim_move_test (http://jsf-p-desktop:34016/)
okey , i checked the hztest.py and they use:
sub = rospy.Subscriber(topic, rospy.AnyMsg, self.callback)
should I look for the use of ... | {
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"id": 5841,
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"openwebmath_score": null,
"tags": "rostest, turtlesim",
"url": null
} |
water, water-treatment
Title: Any idea why tap water goes stale overnight? We have great tap water here in Hungary. My only problem that it goes stale overnight sometimes in some glasses or sometimes even the 2L water boiler has this problem too. But microbes cannot resist 100°C or 20% vinegar, so I thought it might b... | {
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"id": 14813,
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"openwebmath_score": null,
"tags": "water, water-treatment",
"url": null
} |
signal-analysis, convolution, laplace-transform
Title: Transfer function $h(t)$ of a positive feedback system I want to find the transfer function h(t) of the below positive feedback system. I came out till this. | {
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"openwebmath_score": null,
"tags": "signal-analysis, convolution, laplace-transform",
"url": null
} |
cosmology, vacuum, dirac-equation, cosmological-constant
Title: Is the Cosmological constant part of or predicted by or supported by the Dirac Equation? By Cosmological constant here I mean the constant as would be predicted by the vacuum. The one and the same that if compared to the actual expansion of the universe i... | {
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"openwebmath_score": null,
"tags": "cosmology, vacuum, dirac-equation, cosmological-constant",
"url": null
} |
java, minecraft
}
else
{
is_player = false;
}
if (commandLabel.equalsIgnoreCase("nfbm"))
{
if (is_player)
{
if (player.hasPermission("nfbm.admin"))
{
if (args.length == 0)
... | {
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"openwebmath_score": null,
"tags": "java, minecraft",
"url": null
} |
quantum-mechanics, mathematics
One of the approximations for $\pi$ is due to a mathematician called John Wallis in 1655 and is called the Wallis product. There's nothing special about his approximation - it's just one of the many that have been discovered. The recent paper reports that the Wallis product has turned up... | {
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then it can be extended to [−π,π] (as an odd function) by letting f(−x)=−f(x), and then extended periodically with period P =2π. First the Fourier Series representation is derived. In this chapter much of the emphasis is on Fourier Series because an understanding of the Fourier Series decomposition of a signal is impor... | {
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"openwebmath_score": 0.85210150480270... |
quantum-mechanics, heisenberg-uncertainty-principle, wavefunction-collapse
This notion is the root of the problem.
Quantum states which are actually eigenstates of the position operator are mathematically pathological and also completely unphysical.
Some math tools
Consider a one dimensional system.
Suppose $\{|x\rang... | {
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"ur... |
safety
HOWEVER, every country has a clause in their code governing SDS requirements that specifies, essentially, an exemption from listing ingredients that may be regarded as a 'trade secret', or puts at risk an identified Intellectual Property claim. How this is expressed varies; in some countries, a trade name may b... | {
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"tags": "safety",
"url": null
} |
which calls itself. Breadth-first search (BFS) is an algorithm for traversing or searching tree or graph data structures. What follows is the recursive pseudocode for PreOrder, and verification of its correctness by structural induction. 196 Chapter 5. Need pseudo code for a routine that will prompt the user for a numb... | {
"domain": "nauticalsas.it",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9683812327313546,
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"lm_q2_score": 0.8558511506439708,
"openwebmath_perplexity": 815.3644135434384,
"openwebmath_score": 0.4492177963256836,
"ta... |
c++, memory-management, template, c++17, sfinae
// Iterators
inline iterator begin() { return &m_data[0]; }
inline const_iterator begin() const { return &m_data[0]; }
inline iterator end() { return &m_data[m_size]; }
inline const_iterator end() ... | {
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"tags": "c++, memory-management, template, c++17, sfinae",
"url": null
} |
thermodynamics, special-relativity, mass-energy, physical-chemistry, binding-energy
Does this relationship hold? Do the products of an exothermic reaction really weigh ever so slightly less than the reactants?
In a more general sense, does removing energy from a system decrease its mass (or vice versa)? As far as the ... | {
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"tags": "thermodynamics, special-relativity, mass-energy, physical-chemistry, binding-energ... |
python, performance, python-2.x, primes, sieve-of-eratosthenes
Title: Shortest prime number generator we could come up with? I worked with a friend on the following prime number generator. Our goal was to make it as short and as fast as possible. This is what we came up with:
def p(n): # will print out primes between ... | {
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"tags": "python, performance, python-2.x, primes, sieve-of-eratosthenes",
"url": null
... |
javascript, electron
<label> Input : <input type="text" class="configuration-input"/> <button class="configuration-select-input">Select</button> </label>
<label> Output : <input type="text" class="configuration-output"/> <button class="configuration-select-output">Select</button> </label>
<labe... | {
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"openwebmath_score": null,
"tags": "javascript, electron",
"url": null
} |
nlp, lda, distance, similar-documents
Title: Can I use euclidean distance for Latent Dirichlet Allocation document similarity? I have a Latent Dirichlet Allocation (LDA) model with $K$ topics trained on a corpus with $M$ documents. Due to my hyper parameter configurations, the output topic distributions for each docum... | {
"domain": "datascience.stackexchange",
"id": 2226,
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"tags": "nlp, lda, distance, similar-documents",
"url": null
} |
newtonian-mechanics, general-relativity, special-relativity, dimensional-analysis, mass-energy
Therefore, I do not think it would be useful to retire the concept of mass. Mass is a type of energy that tells us several useful things about a particle's intrinsic properties. The total energy of a particle also includes i... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, general-relativity, special-relativity, dimensional-analysis,... |
magnetic-fields
Title: Magnetic field outside a solenoid I couldn't picture the idea behind the zero magnetic flux outside the solenoid properly. My teacher explained it as
"Components of the magnetic field in other directions are cancelled by opposing fields from neighbouring coils. Outside the solenoid the field is... | {
"domain": "physics.stackexchange",
"id": 95994,
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"tags": "magnetic-fields",
"url": null
} |
java, algorithm, object-oriented
Node node;
int min_bound;
int max_bound;
}
public boolean check_if_valid_binary_search_tree(Node node) {
if (node == null) return true;
Deque<Bounds> stack = new ArrayDeque<Bounds>();
Bounds bounds = new Bounds();
bounds.node = node;
bounds.max_bound =... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, algorithm, object-oriented",
"url": null
} |
physical-chemistry, equilibrium
Title: Why is there a sudden drop in the concentration of ammonia in this graph?
So initially they are mixed with the mole ratio of $\ce{H2}$ and $\ce{N2}$ being 3:1 respectively. It seems as the reaction proceeds, both these quantities decrease and the quantity of ammonia increases un... | {
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"id": 4055,
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"tags": "physical-chemistry, equilibrium",
"url": null
} |
ros2, urdf, ros-humble, robot-state-publisher, errors
<link name="boggiesidelegr_1">
<inertial>
<origin xyz="-0.3354348448034716 0.032519338109216644 -0.666434058596638" rpy="0 0 0"/>
<mass value="0.16957453765781244"/>
<inertia ixx="0.000188" iyy="0.000192" izz="6e-06" ixy="0.0" iyz="0.0" ixz="4e-06"/>
... | {
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"openwebmath_score": null,
"tags": "ros2, urdf, ros-humble, robot-state-publisher, errors",
"url": null
} |
special-relativity, metric-tensor, tensor-calculus, conventions, notation
$$(M^T)_{\mu}^{\ \ \nu} := M^{\nu}_{\ \ \mu}$$
References:
Why is not ${(\Lambda^T)^\mu}_\nu = {\Lambda_\nu}^\mu$? , Transpose of (1,1) tensor
3.
$$M^\mu_{\ \ \nu} := g_{\mu \alpha} g^{\nu \beta} M^{\alpha}_{\ \ \beta} $$
Edit:
This reference t... | {
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"url... |
In any pile of randomly flipped coins (they needn’t be all or even part pennies), let N be the number tails. Create your second pile by pulling a random coins from the initial pile. Because the coins are randomly selected, you don’t know how many tails are in the new pile, so let that unknown number of coins be X . ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
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"lm_q2_score": 0.8152324915965392,
"openwebmath_perplexity": 1426.7588658187437,
"openwebmath_score": 0.6211270093917847,
"ta... |
general-relativity, differential-geometry, metric-tensor, coordinate-systems, curvature
degrees of freedom in the coefficients ${b^\mu}_{\rho\sigma\tau}$
$$
x^\mu \to x^\mu + {b^\mu}_{\rho\sigma\tau} x^\rho x^\sigma x^\tau+\ldots
$$
of a local change-of-coordinates expansion that keeps the metric euclidean up to qua... | {
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"tags": "general-relativity, differential-geometry, metric-tensor, coordinate-systems, curv... |
acid-base, analytical-chemistry
http://www.chemicalforums.com/index.php?topic=6140.0 | {
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"openwebmath_score": null,
"tags": "acid-base, analytical-chemistry",
"url": null
} |
quantum-mechanics, measurement-problem, observables
And since which part of the beam when left or right depended on the calibration of the device then it in no way is something intrinsic to the electron it is an interaction between two things, and interaction that changes the electron.
It is best to pretend that the w... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, measurement-problem, observables",
"url": null
} |
c++, performance, recursion, lambda, c++20
// specific case for std::array
template<class ExPo, class T, std::size_t S, class F>
requires (std::is_execution_policy_v<std::remove_cvref_t<ExPo>>)
constexpr auto recursive_transform(ExPo execution_policy, const std::array<T, S>& input, const F& f)
{
using Transformed... | {
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"tags": "c++, performance, recursion, lambda, c++20",
"url": null
} |
neuroscience, central-nervous-system
Title: How a nerve impulse reaches the correct destination? Say your brain wants to retract your right hand.
If there is some information coding playing a major role here, then what is the mechanism to find the correct path to reach the correct muscle?
Or is it every part has a sin... | {
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"tags": "neuroscience, central-nervous-system",
"url": null
} |
terminology, endocrinology, nomenclature
Whereas
-tropic
1 : turning, changing, or tending to turn or change in a (specified) manner or in response to a (specified) stimulus
2 : attracted to or acting upon (something specified)
It seems probable, therefore, that the original form was somatotrophin, but, either ... | {
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"tags": "terminology, endocrinology, nomenclature",
"url": null
} |
general-relativity, spacetime, differential-geometry, metric-tensor, curvature
Title: What is Dirac's reasoning when showing the curvature vanishing implies we can choose rectilinear coordinates? In section 12 of Dirac's book "General Theory of Relativity" he is justifying the name of the curvature tensor, which he ha... | {
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"tags": "general-relativity, spacetime, differential-geometry, metric-tensor, curvature",
... |
ngs, illumina, pacbio
When considering a hybrid approach I was told by someone at a sequencing facility that adding short reads to polish the HiFi reads assembly lowers the quality of the assembly and introduces more errors that corrections. Why is this? I haven't been able to find this statement in the literature. Hi... | {
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"tags": "ngs, illumina, pacbio",
"url": null
} |
c#, .net, multithreading
This must update a total of 19602 objects each tick. Is there any way to speed this up? Threading maybe?
Objects(Ground and buildings) are stored in Layer1 and Layer2 ID Arrays of size 99x99. Most of them do nothing during the update method.
I've only recently began programming, so I apologize... | {
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"tags": "c#, .net, multithreading",
"url": null
} |
human-biology, physiology, cardiology, heart-output
I read about it but didn't understand it very well.
Can you explain it and Which one is mostly used in clinics to measure cardiac output? Drs. Swan and Ganz developed a direct method of measuring cardiac output by thermodilution. They invented a multilumen catheter w... | {
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"tags": "human-biology, physiology, cardiology, heart-output",
"url": null
} |
black-holes, astrophysics, stars
$M_\star\lesssim0.5M_\odot$
unable to produce helium in the core (insufficient temperatures)
expected to continue burning hydrogen for $t_{burn}>t_{age\,of\,universe}$
Thus, not every star produces iron in the core; this only applies to stars with mass $\gtrsim8M_\odot$.
The Chandras... | {
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"tags": "black-holes, astrophysics, stars",
"url": null
} |
statistics, gene-expression, correlation, p-values
Suplementary question
Documentation of the method fdrcorrection from Python Statsmodels library suggests that for negative correlations (that could be frequent in a mRNA x miRNA correlation analysis) Benjamini-Yekutieli would work better; is that right? Or Benjamini-H... | {
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"tags": "statistics, gene-expression, correlation, p-values",
"url": null
} |
cc.complexity-theory, lo.logic, sat, proof-complexity
Lemma 6 of the paper gives a fairly short and intuitive proof that Spoiler cannot win the $n$-pebble game on ${EPHP}_n^{n+1}$, hence ${EPHP}_n^{n+1}$ has no resolution refutation of width at most $n-1$.
The paper has another example in Lemma 9, based on the dense l... | {
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"tags": "cc.complexity-theory, lo.logic, sat, proof-complexity",
"url": null
} |
moveit, ros-kinetic
Title: group is not a chain
Hello,
I’m using panda arm with moveit. I want to create the planning group which will include all the joints in my robot.
Currently i have created two planning groups as suggested in this tutorial.
When i simply add all joints in one planning group i get error of group... | {
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"url": null
} |
electromagnetism, maxwell-equations, electromagnetic-induction
You could, I suppose, introduce an entirely new word to denote the field generated by changing $\mathbf{B}$. Electrodynamics would then involve three fields:
$\mathbf{E}$ fields, produced by electric charges, satisfying $\nabla \cdot \mathbf{E} = \frac{... | {
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} |
Half precision floating-point arithmetic is now readily available in hardware, in both the IEEE binary16 format and the bfloat16 format, and it is increasingly being used in machine learning and in scientific computing more generally. For the computation of the inner product of two $n$-vectors the backward error bound ... | {
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"lm_q2_score": 0.8104789109591832,
"openwebmath_perplexity": 495.1040687882936,
"openwebmath_score": 0.9643710255622864,
"tags": nu... |
operating-systems, concurrency, synchronization, mutual-exclusion
Furthermore, these primitives only provide atomicity. Synchronization is more than that.
Synchronization is atomicity plus events
Synchronization problems broadly fall into two categories:
Avoid certain orders of operations which lead to wrong results ... | {
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"tags": "operating-systems, concurrency, synchronization, mutual-exclusion",
"url": null
} |
java, algorithm, unit-testing, library
/**
* This class implements a sample Gray code demonstration.
*
* @author Rodion "rodde" Efremov
* @version 1.6 (Jan 4, 2018)
*/
public final class GrayCodeDemo {
public static void main(String[] args) {
GrayCode grayCode = GrayCodeGenerator.generate(4);
... | {
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"tags": "java, algorithm, unit-testing, library",
"url": null
} |
quantum-mechanics, quantum-field-theory, quantum-information
in this picture because it looks simpler instead of following anyonic rules. For four Majorana zero modes, if the total topological charge is $1$ there are two states $|0\rangle_{12}0\rangle_{34}$ and $|1\rangle_{12}|1\rangle_{34}$ ($i\gamma_1\gamma_2\cdot i... | {
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"tags": "quantum-mechanics, quantum-field-theory, quantum-information",
"url": null
} |
c#
Title: Refactoring the following methods to make it easier to read Would it be possible to refactor the following methods?
If so - how would I go about best doing it?
public void PlotListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (PlotListView.SelectedItems.Count == 0) r... | {
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} |
cr.crypto-security, homomorphic-encryption
Another Thought:
In case the word "efficiently" in the title was intended to be interpreted as "not FHE," here's an independent observation of mine that might be useful for situations like you ran into just now -- i.e. "I think I need more multiplications than the bilinear ma... | {
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"tags": "cr.crypto-security, homomorphic-encryption",
"url": null
} |
particle-physics, conservation-laws, scattering, vacuum
Title: Can the particle reaction $a+b \rightarrow c+d$ occur in vacuum? In particle physics, can the reaction $a+b \rightarrow c+d$ occur in vaccum from the point of view of energetic balance?
Both $a,b,c,d$ are generic and different particles.
It is true, for ex... | {
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"tags": "particle-physics, conservation-laws, scattering, vacuum",
"url": null
} |
java, event-handling
import java.util.HashMap;
import java.util.Map;
public class EventContainer {
private ButtonState mState;
private Map<ButtonState, EventListener> mEventHandlers = new HashMap<>();
private static ButtonState generateNextState(boolean buttonInput, ButtonState oldState) {
switch (oldState... | {
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"url": null
} |
newtonian-mechanics, classical-mechanics, drag, aerodynamics
$g$: Acceleration due to gravity, equal to 9.81 m/s${^2}$
$\rho$: Density of air, assumed to be 1.225 kg/m$^3$
$A$: Projected surface area, the parameter that seems to be going all wrong
$C_{d}$: Coefficient of drag, assumed to be 1.1 for a chest-first sk... | {
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"tags": "newtonian-mechanics, classical-mechanics, drag, aerodynamics",
"url": null
} |
python, web-scraping
parser.add_argument('-l', '--url', help="The base link to be crawled", required=True)
parser.add_argument('-k', '--keywords', help="Keywords to search", required=True)
args = parser.parse_args()
keywords = (args.keywords).split(',')
mapping = dict()
mapping[args.url] = keywords
logger.info(m... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, web-scraping",
"url": null
} |
### Author Topic: FE Sample--Problem 5 (Read 2613 times)
#### Victor Ivrii
• Elder Member
• Posts: 2563
• Karma: 0
##### FE Sample--Problem 5
« on: November 27, 2018, 03:57:31 AM »
Show that the equation
$$e^{z}=e^2z$$
has a real root in the unit disk $\{z\colon |z|<1\}$.
Are there non-real roots?
« Last Edit: Nove... | {
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"tags": n... |
(Unless I did something wrong) $g$ is the inverse of $f$ so $f$ is an isomorphism.
Now observe that $V(x^{2}-yz) \subseteq \mathbb{A}^{3}$ has only one singular point, namely the origin $(0,0,0)$ thus via the above isomorphism we see that $(0,0,0,0)$ is the only singular point of $X$.
The part I'm not sure is how to ... | {
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"openwebmath_score": 0.9646562337875366,
"tags... |
navigation, robot-pose-ekf
Originally posted by Astronaut on ROS Answers with karma: 330 on 2012-12-23
Post score: 1
The robot pose ekf will not start when it only receives messages on this imu's topic, it also expects messages on either the 'vo' or the 'odom' topic. So you need a odometry topic in order to get it wo... | {
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"tags": "navigation, robot-pose-ekf",
"url": null
} |
human-physiology, nomenclature, etymology
Useful prefixes and suffixes
Word roots for organs
Some general terms
System-specific terms, for example, for circulatory system
The Free Dictionary has a Medical Dictionary, which shows results from various dictionaries with basic etymology included.
Etymonline is a detailed... | {
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"tags": "human-physiology, nomenclature, etymology",
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This is a special case of the general property of sequences that the sum of two convergent series converges to the sum of their limits.
-
Hm... I guess i have to take that, although I'd love to see a proof for that property ;) – iolo Nov 1 '11 at 11:25
@iolo. Suppose $a_n \to a$ and $b_n \to b.$ Then by definition, f... | {
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"openwebmath_score": 0.981260359287262,
"tag... |
python, pyqt
def _setup_interactive_elements(self) -> None:
elements = self._interactive_elements
for key, value in self._settings.items():
if isinstance(elements[key], (QDoubleSpinBox, QSpinBox)):
elements[key].setValue(value)
elif isinstance(elements[key], (QCh... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, pyqt",
"url": null
} |
optimization, performance, sql, mysql
That query will duplicate the count of approved users if there are multiple applications for the same accountId. In the SQLFiddle I have, it returns a count of 4 for only 2 distinct approvaluserjoin records.
It is likely that in your data it is not possible to get that condition t... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "optimization, performance, sql, mysql",
"url": null
} |
electromagnetism, electromagnetic-radiation
Thanks for help.
Here is a similar question, unfortunately without satisfying answer. You've explicitly asked for answers that are simpler than the existing ones, so let me start off with a warning: Maxwell's equations are intrinsically mathematical statements. If you want a... | {
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"tags": "electromagnetism, electromagnetic-radiation",
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java, beginner
Here you create an ATM with a name and balance. If you think about what an ATM does, this does not reflect real life. ATM's have a balance as in how much money they contain but they do not have a first and last name. You may have been thinking of a BankAccount when implementing the code. This is support... | {
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"tags": "java, beginner",
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5. Re: n coin flips
You are about $9.05464714448735\times10^{22}$ times as likely to win the lottery as to flip a coin 100 times and get a predetermined outcome for all 100 flips, but you are about $6.36280810788257\times10^{37}$ times as likely to flip a coin 100 times and get a predetermined outcome for all 100 flip... | {
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"openwebmath_perplexity": 223.12239102309528,
"openwebmath_score": 0.7530325651168823,
"ta... |
c++, c++11, memory-management
Title: Handle-based entity manager (that stores entities contiguously) I've created a generic data structure intended for game development entity management. It has some interesting properties:
Entities are stored contiguously in an std::vector.
Stored entities can be in one of three sta... | {
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"tags": "c++, c++11, memory-management",
"url": null
} |
thermodynamics, energy, acoustics, collision
Greg A bouncing superball is just not that loud and it takes a surprisingly small amount of energy to make a loud sound. On the other hand it takes a fair bit of energy to heat things up so I think that its safe to say that the vast majority of the lost kinetic energy is b... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, energy, acoustics, collision",
"url": null
} |
control, ros-indigo
Title: Ros Control: VelocityJointInterface and PositionJointInterface in one yaml
Hello,
i am currently trying to build a simple car model from scratch.
So far my URDF comes along pretty good and my ROS Node also publishes data to the correct ros Node.
Lately i have tried to swich from all EffortJ... | {
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"openwebmath_score": null,
"tags": "control, ros-indigo",
"url": null
} |
thermodynamics, free-energy
$$\frac{\mathrm{d}\ln{K}}{\mathrm{d}\left(\frac{1}{T}\right)} = -\frac{\Delta H^\circ}{R}$$
is exact. Moreover, the derivation of the van't Hoff equation properly takes into account the fact that, in varying temperature $T$, the initial and final states for $\Delta G^\circ$ are constrained... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "thermodynamics, free-energy",
"url": null
} |
catkin-make
Comment by rnunziata on 2016-03-05:
If libsl_zed.so had a missing dependency should not including the link library as I have done resolve the reference? I was wondering if there was a circular reference somewhere.
Problem determined to be zedlab s issue with the Jetson TK1. | {
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"tags": "catkin-make",
"url": null
} |
Tuberkulosis Seir dengan Terapi pada Individu Terinfeksi The spread of tuberculosis (TB) among individuals in the population can be described by the epidemic model, which is a mathematical model that divides the population into four subpopulations i. Horizontal solid line segments show the time periods that the individ... | {
"domain": "saltotech.it",
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"lm_q1_score": 0.9854964186047326,
"lm_q1q2_score": 0.8080019396751337,
"lm_q2_score": 0.8198933293122507,
"openwebmath_perplexity": 1856.8157294912369,
"openwebmath_score": 0.5575017929077148,
"tag... |
quantum-mechanics, mathematical-physics, operators, hilbert-space, dirac-delta-distributions
Title: Mathematical understanding of Quantum Mechanics Assuming that $\phi(r) = F (\psi(r))$ for some operator $F$ in Quantum Mechanics. Then,
in our lecture today, we said that $$\phi(r) = \langle r|F |\psi\rangle = \int_{\ma... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, mathematical-physics, operators, hilbert-space, dirac-delta-dis... |
object-oriented, design-patterns, generics, kotlin
val accountantDataList = mutableListOf<AccountantData>()
val developerDataList = mutableListOf<DeveloperData>()
employeeRecords.forEach {
if (it.employeeType in EmployeeType.tierOneTypes) {
when (it.employeeType) {
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "object-oriented, design-patterns, generics, kotlin",
"url": null
} |
python, graph
Title: Prim's algorithm for finding the minimum spanning tree So I was coding Prim's algorithm for practice and this is what I wrote. It works for finding the weight of the minimum spanning tree (MST) but I'm wondering if the loop I am doing to add the the edges in the frontier to the minheap is optimal.... | {
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"openwebmath_score": null,
"tags": "python, graph",
"url": null
} |
ros, ros2, urdf, stl
I've tried with different prefixes ( package://, [..]
What URI did you use with package://?
Comment by MAB Jakub on 2020-11-24:
I've tried
package://robot_sim/meshes/base_link.stl
as well as providing full path in there
Comment by MAB Jakub on 2020-11-25:
I've just realised that RViz gave me and... | {
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"tags": "ros, ros2, urdf, stl",
"url": null
} |
newtonian-mechanics, classical-mechanics, forces, energy, history
The historical facts
It was Gottfried Leibniz, as early as 1686 (one year before the publication of the Principia) who first affirmed that kinetic energy is proportional to squared velocity or that velocity is proportional to the square root of energy: ... | {
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"tags": "newtonian-mechanics, classical-mechanics, forces, energy, history",
"url": null
... |
# Find the determinant of the following $4 \times 4$ matrix
Use a cofactor expansion across a row or column to find the determinant of the following matrix
$$B=\begin{pmatrix}1 &c&0&0\\0&1&c&0\\0&0&1&c\\c&0&0&1\end{pmatrix}$$
Clearly indicate the steps you take.
I have tried
$$\det B = 1 \det \begin{pmatrix}1 &c&0... | {
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"lm_q2_score": 0.8438950966654772,
"openwebmath_perplexity": 611.1684636961144,
"openwebmath_score": 0.8920076489448547,
"tag... |
The question has a slight misprint. It should be what Bhagirathi says in the comments.
Nevertheless,
$\small \Bigl | A \cup B \cup C \Bigr | = |A| + |B| + |C| - \Bigl | A \cap B \Bigr | - \Bigl | A \cap C \Bigr | - \Bigl | B \cap C \Bigr | + \Bigl | A \cap B \cap C \Bigr |$
• $A \equiv$ Students who have taken Progr... | {
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"lm_q1_score": 0.970239909496136,
"lm_q1q2_score": 0.8207671175815199,
"lm_q2_score": 0.8459424411924673,
"openwebmath_perplexity": 1848.363556821335,
"openwebmath_score": 0.8385860323905945,
"tags":... |
python, unit-testing
def finish(self):
if not self.completed:
sys.stdout.write("\r|{0:50}|COMPLETE\t\t\n".format("=" * 50))
self.completed = True
def __enter__(self):
sys.stdout.flush()
message = "\r|{:50}|Initialising".format(0)
sys.stdout.write(message)
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, unit-testing",
"url": null
} |
gazebo, urdf, ros-kinetic
<!-- plugin needed to control robot using ros -->
<gazebo>
<plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
<robotNamespace>/antenna_robot</robotNamespace>
</plugin>
</gazebo>
Relevant section of launch file, I have the whole robot under its own namespace sinc... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gazebo, urdf, ros-kinetic",
"url": null
} |
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