text stringlengths 1 1.11k | source dict |
|---|---|
ros
sudo apt-get remove ros-fuerte-*
sudo apt-get clean && sudo apt-get update
sudo apt-get install ros-fuerte-desktop-full
However, when I try that, things are still broken. Here is the output from the last command:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packa... | {
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"url": null
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for the same. This is also known as $$L1$$ regularization because the regularization term is the $$L1$$ norm of the coefficients. Ridge regression - introduction¶. Yes simply it is because they are good biased. Important things to know: Rather than accepting a formula and data frame, it requires a vector input and matr... | {
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"lm_q1_score": 0.9898303413461358,
"lm_q1q2_score": 0.8527766581643764,
"lm_q2_score": 0.8615382076534742,
"openwebmath_perplexity": 967.5996990504327,
"openwebmath_score": 0.39270108938217163... |
quantum-mechanics, wavefunction, bells-inequality
They don't have separate wavefunctions. Any two entangled particles have just one wavefunction that describes both of them. And as such there is no sort of orthogonality relation. Take for example the entangled singlet state used in the bell theorem:
$$\frac{1}{\sqrt{2... | {
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"tags": "quantum-mechanics, wavefunction, bells-inequality",
"url": null
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The last expression is proportional to the negative of d and, therefore, is non-positive. We can then write the key expression,
s = ComplexExpand[(r + I Sqrt[-q^3 - r^2])^(1/3), TargetFunctions -> {Re, Im}]
which, after a bit of additional manipulation becomes
(* (c1 + c2^2)^(1/6) Cos[1/3 ArcTan[c2, Sqrt[c1]]] +
I ... | {
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"lm_q1_score": 0.9744347860767305,
"lm_q1q2_score": 0.8011696916375397,
"lm_q2_score": 0.8221891327004132,
"openwebmath_perplexity": 2573.0345299107407,
"openwebmath_score": 0.29087039828300476,
"t... |
c++, programming-challenge, array, vectors
Honestly, it is much easier to understand.
final = 99999999; is very fragile. Consider a ramp-up loop:
final = 0;
for (int j = 0; j < consecutivos[i]; j++) {
total += elementos[j];
}
Your code complexity is \$O(n*k)\$ (k being a width of the window). Notice that... | {
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"tags": "c++, programming-challenge, array, vectors",
"url": null
} |
ros, nao-driver, nao
Title: Multiple NAOs, one roscore
Hello,
I would like to use the nao_driver ros stack to control multiple NAO robots at the same time. Does anyone have any experience with this?
The nao_driver stack is run locally on a computer using a roscore instance on the same computer.
When launching nao_dri... | {
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"tags": "ros, nao-driver, nao",
"url": null
} |
c++, memory-management, pointers, weak-references
weak_ptr.hpp
#pragma once
#include "controlblock.hpp"
#include "shared_ptr.hpp"
template<class T>
class WeakPtr {
#define CHECK assert(Invariant());
template<class Y> friend class SharedPtr;
private:
T* _ptr;
ControlBlock<T>* _ctrl_block;
public:
Weak... | {
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"tags": "c++, memory-management, pointers, weak-references",
"url": null
} |
lkh1986
Oh yeah... They must intercept... I miss out that one. Let me try again one more time.
lkh1986
In that case, a+b= 2a and the third equation becomes 2au= -au so, again, u= 1/3.
Nice explanation, HallsofIvy. Now let me try do solve it and rephrase it in my own understanding.
Let the equation of line 2 be <a, b... | {
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"lm_q2_score": 0.8333245994514084,
"openwebmath_perplexity": 1069.0698882704053,
"openwebmath_score": 0.8202084302902222,
"ta... |
electromagnetism
$$\begin{cases} \nabla \cdot \mathbf{E}=\frac{\rho}{\varepsilon_0} \\ \nabla \times \mathbf{E} = - \frac{\partial \mathbf{B}}{\partial t}\end{cases}.$$
Question Do those equations hold if we have a moving conductor in a stationary magnetic field? I guess not: this would mean $\mathbf{E}=\mathbf{0}$. H... | {
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} |
$\mathcal{C}(W)=\left\{V \in \mathcal{U}_f: \text{there exists a chain from } W \text{ to } V \right\}$
$\mathcal{E}(W)=\bigcup \mathcal{C}(W)$
One observation we make is that for $W_1,W_2 \in \mathcal{U}_f$, if $\mathcal{E}(W_1) \cap \mathcal{E}(W_2) \ne \varnothing$, then $\mathcal{C}(W_1)=\mathcal{C}(W_2)$ and $\m... | {
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"lm_q1_score": 0.982013790564298,
"lm_q1q2_score": 0.8204563532136758,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 579.0447059325933,
"openwebmath_score": 0.9998471736907959,
"tags": n... |
c++, performance, c++17, queue
}
}
else{
for(; first < other.tail; ++first) mS.theArray[first] = other.mS.theArray[first];
}
return *this;
}
constexpr circularQueue& operator=(const circularQueue<T,N>&& other){
std::size_t fir... | {
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"tags": "c++, performance, c++17, queue",
"url": null
} |
c#, set
Title: Set data structure in C# The following data structure is meant for manipulating algebraic/mathematical sets.
I want Set<T> to be compatible and interchangeable with any similar data structure available in .NET. I didn't use HashSet<T> because I don't like the fact that HashSet<T> is unordered.
Kindly re... | {
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"tags": "c#, set",
"url": null
} |
astronomy, telescopes, astrophotography
And, if your telescope design admits it:
Collimation: The alignment of the optical train. | {
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"tags": "astronomy, telescopes, astrophotography",
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} |
homework-and-exercises, rotational-dynamics
$$ \Delta \omega = {I}_C^{-1} c J $$ where ${I}_C = \left( \frac{m_1 m_2}{m_1 + m_2} \right) d^2$ is the mass moment of inertia of the system of two masses. This simplifies to $$ \Delta \omega = \frac{1}{m_2 d} J $$
Now you need to find the impulse $J$ (linear momentum excha... | {
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"tags": "homework-and-exercises, rotational-dynamics",
"url": null
} |
genetics, terminology
Cx3cr1$^{CreER/CreER}$ "homo CreER under the Cx3cr1CreER promoter" or just "the CreER animals"
Cx3cr1$^{CreER/+}$ "the hetero CreER animals"
and for CreER is it correct to say that is a chimeric protein of Cre and mutated hormone-binding domain of the estrogen receptor?
Thank you in advance!
Edit... | {
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} |
algorithms, algorithm-analysis, sorting
One way to use this measure to sort arrays more efficiently is to use the previous algorithm to find all such pairs. Let $L_1$ be the list above after removing the elements from it and $L_2$ the list of all removed elements. Now since we know that $L_1$ is sorted, all we need to... | {
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"openwebmath_score": null,
"tags": "algorithms, algorithm-analysis, sorting",
"url": null
} |
cell-biology, neuroscience, physiology, electrophysiology, action-potential
Title: Why nerve fibre is infatiguable?( is my conjecture correct?) According to this:
A nerve fibre cannot be fatigued, even if it is stimulated for a long time. This property of infatiguability is due to absolute refractory period.
How is ... | {
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"u... |
error-correction, stabilizer-code
We conclude that measuring $(\hat{S}_1, \hat{S}_2, \hat{S}_3, \hat{S}_4, \hat{S}_5, \hat{S}_6, \hat{S}_7, \hat{S}_8)$ on states $|\psi_5\rangle$ and $|\psi_6\rangle$ yields the same syndrome $(+1, +1, +1, +1, +1, +1, -1, -1)$. | {
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"openwebmath_score": null,
"tags": "error-correction, stabilizer-code",
"url": null
} |
quantum-field-theory
$\beta(g^2)=\mu \frac{\partial g^2}{\partial \mu}=\frac{9}{2\pi^2}g^4+O(g^6)$
The solution of this differential equation reads $\frac{1}{g^2_\mu}=\frac{1}{g^2_\Lambda}+\frac{9}{2\pi^2}\ln\frac{\Lambda}{\mu}$ where $\mu$ is the energy scale at which you want to know the value of the coupling and ... | {
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} |
nxt, i2c
For my purposes at the moment I am just flipping it to 0x10 for the prototype board (which oddly enough when connected to my Arduino
shows up as 0x08 but that is another story). I need to modify things so I can use sensors that have differing i2c addresses but for now I am thrilled!
I would love to see someon... | {
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"tags": "nxt, i2c",
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fft, phase, radar, linear-phase
Question-1: Am I right in assuming that a constant velocity results in a LINEAR phase shift of the frequency component across chirps?
Question-2: If the phase shift is linear, how can FFT along a column determine the same? FT/DFT essentially performs decompositions in terms of basis sin... | {
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"tags": "fft, phase, radar, linear-phase",
"url": null
} |
classical-mechanics, harmonic-oscillator, hamiltonian-formalism, action
Title: Help understanding what the Hamiltonian signifies for the action compared with the Euler-Lagrange equations for the Lagrangian? Consider the Lagrangian for a simple harmonic oscillator
\begin{equation}
L (x,\dot{x}) = \frac{1}{2}m\dot{x}^2 ... | {
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kinematics
Getting the result by the formula I get
$v_f^2 = v_i+2a \Delta x$ $\ \ \ $ = $v_f=\sqrt{0^2+10\cdot2\cdot50} = 31.62277$
and now I want to get the same result by intuition
The acceleration is $10m/s^2$, at the first second the velocity is $10m/s$ and the distance travelled is $10m$, after the second second ... | {
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"tags": "kinematics",
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proteins, python, motifs, multi-fasta
Right now, what I want to do is to also get the 6 amino acids after matching this motif, such that I get an output like the one below where the length will now be 15,.
P1 33 47 VTLLPAADLLMAIID
The code that I have tried to get the 6 amino acids after my match is below.
import Bio... | {
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"tags": "proteins, python, motifs, multi-fasta",
"url": null
} |
quantum-mechanics, quantum-interpretations, interference, multiverse, identical-particles
A layperson hearing about quantum mechanics, through all the homely examples like the cat that is dead and alive at the same time, will naturally think that wavefunctions or quantum states naturally consist of a weighted sum of w... | {
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"tags": "quantum-mechanics, quantum-interpretations, interference, multiverse, identical-pa... |
safety, hydrogen, vapor-pressure, pressure
The output pressure I desire would be about 200 psi
An Idea: (I'm an Electrical Engineer, don't laugh!)
Emulate Vapor Pressure
Gasses like CO2, Butane, and Propane have relatively low vapor pressures, allowing them to form a liquid at reasonable pressures. At about 800 psi, C... | {
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"tags": "safety, hydrogen, vapor-pressure, pressure",
"url": null
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ds.algorithms, reference-request, graph-theory, graph-algorithms
Title: References for Modular Decomposition What are good papers/books to better understand the power of Modular Decomposition and its properties?
I'm particularly interested in algorithmic aspects of Modular Decomposition. I have heard that it is possib... | {
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cc.complexity-theory, graph-theory, graph-algorithms, co.combinatorics, bipartite-graphs
The idea is to create a graph $G_L$ (pictured on the left) that consist of two edges per clause and has the only upward pointing edge of all the $G_\bullet$, so any cycle must use that edge.
For each variable $x_i$, create a varia... | {
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"tags": "cc.complexity-theory, graph-theory, graph-algorithms, co.combinatorics, bipartite-... |
python, c++, beginner, performance
1.2 -0.3 0.01 0.01 0.0 0.3 0.3 2.04 100
0.1 -0.3 0.01 0.01 0.0 0.3 0.3 2.01 100
0.5 -0.3 0.01 0.01 0.0 0.3 0.3 3.01 100 The fir... | {
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"tags": "python, c++, beginner, performance",
"url": null
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newtonian-gravity, orbital-motion
Title: Average distance between an object and the body it's orbiting over time I became interested in finding the average distance of an orbiting object over time from its parent, expressed mathematically as $\frac{\int_{0}^{T}r\left(t\right)dt}{T}$, where $T$ is the orbital period an... | {
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"tags": "newtonian-gravity, orbital-motion",
"url": null
} |
python, performance, algorithm, python-2.x, robotframework
@staticmethod
def _deliminator_search(start, keyword, *keywords):
index = 0
while keyword != '\\' and keyword != '\\\\':
keyword = keywords[int(start) + index]
index = index + 1
return index
@staticmetho... | {
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-
thanks for your detailed reply. You are right. I think the inequality would be true if we restrict the distributions further to only symmetric distributions, i.e., in above mentioned example, $f(x) = e^{-x} f(-x)$. Could you please comment on this or should I ask a separate question ? This symmetry condition is avail... | {
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"openwebmath_score": 0.9975676536560059,
"tag... |
magic-states
Note, moreover, that there are no $\pm i$ phases - an easy way to see why this cannot be is that if $\sigma_{i}$ is Hermitian (which we know they are) then so must be $U \sigma_{i} U^{\dagger}$ - but then the 'output' cannot carry a phase $\pm i$, since any $\pm i \sigma_{j}$ is anti-Hermitian.
The $|T\ra... | {
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Consider the $m\times n$ 0-1 matrix $M$ whose columns are indexed by the elements of $X$ and whose rows are indexed by members of $\mathscr{F}$ and whose $(i,j)$th entry $M_{i,j}$ is 1 if and only if $j\in F_i$. Then every column has at most $k-1$ zeros, or else taking the union of the $F_i$ corresponding to the zeros ... | {
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"lm_q2_score": 0.8175744695262777,
"openwebmath_perplexity": 87.79573050201753,
"openwebmath_score": 0.8934551477432251,
"tags... |
python, statistics, feature-scaling
Title: Sensitivity to scaling of features in a multivariate gaussians I'm using the HMMLearn python package for hidden markov models. That implementation is build on multivariate gaussian distributions.
So I have a string of features. How sensitive are gaussians to vastly differen... | {
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a sequence. Chapter 5 The Integral 209. Unit 4 The Definite Integral 3 weeks 5. Integration Techniques Worksheet Calculate the integrals for the following: Exercise 1 Exercise 2 Exercise 3 Exercise 4 Exercise 5 Exercise 6 Exercise 7 Exercise 8 Exercise 9 Exercise 10 Exercise 11 Exercise 12 Solution of exercise 1 Soluti... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9893474897884492,
"lm_q1q2_score": 0.8156793351532198,
"lm_q2_score": 0.8244619242200082,
"openwebmath_perplexity": 1305.6623628539103,
"openwebmath_score": 0.848722517490387,
"tags... |
# What Is a Trapezoid? More on Inclusive Definitions
A month ago, I wrote about classifying shapes, discussing inclusive and exclusive definitions, and variations in different contexts. I promised to return to the subject, moving on to the specific issue of trapezoids, and some other related topics. Now is the time.
... | {
"domain": "themathdoctors.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9825575129653769,
"lm_q1q2_score": 0.8875385098544801,
"lm_q2_score": 0.9032942073547149,
"openwebmath_perplexity": 622.3495079181878,
"openwebmath_score": 0.683411717414856,
"tag... |
c++, random, reinventing-the-wheel
// Access the underlaying random generator engine (const overload).
const ENGINE & GetRandomEngine() const;
private:
// The pseudo-random generator engine.
ENGINE engine;
// Helper variables used by the normal distribution calculation.
float leftover;
bool ... | {
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"openwebmath_score": null,
"tags": "c++, random, reinventing-the-wheel",
"url": null
} |
linear-systems, non-linear, distortion
Title: Create distortion from basic linear (and non-linear if neccessary) DSP elements I'm studying mechatronics and I'm intrested in DSP basics. My lecturer said that there are four basic linear DSP elements:
Adder (and other mathematical operations)
Amplification (shown on dia... | {
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"id": 4888,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "linear-systems, non-linear, distortion",
"url": null
} |
human-anatomy, neuroanatomy, eyes, neurology
So how do these observations resolve your question? Quite simply, the lateral movement of information from the foveal/macular photoreceptors happens predominantly in the outer plexiform layer. That buys the inner plexiform layer considerably more space to further spread t... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "human-anatomy, neuroanatomy, eyes, neurology",
"url": null
} |
homework-and-exercises, kinematics, velocity, speed
In that case for the acceleration part, until 300 seconds your motion is given by:
$$s(t)=\frac{1}{2}at^2,~~v(t)=at$$
After 300 seconds you reach a distance $s_{300}=\frac{1}{2}a (300~s)^2$ and a maximum velocity of $v_{300}=a(300~s)$
The motion for the second part w... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, kinematics, velocity, speed",
"url": null
} |
python, parsing
In this version of the class, the consume method would become something like:
return self._replace(cur=self.cur + how_many)
which runs in constant time. Of course, the rest of the code would have to be updated to use the new representation, but I suspect there will turn out to be simplifications — for... | {
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"tags": "python, parsing",
"url": null
} |
c++, game, sfml
Our goal is to encapsulate the just mentioned functionality into a class that relieves
us from managing resources again and again. For resource management, the C++
idiom Resource Acquisition Is Initialization (RAII) comes in handy. like following approach
ResourceHolder.h
#ifndef RESOURCEHOLDER_H
#defi... | {
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"tags": "c++, game, sfml",
"url": null
} |
general-relativity, gravity
Title: Shine a beam of light horizontally, drop a stone from same height - would both hit the ground at the same time? If a beam of light was shone horizontally, and simultaneously a stone was dropped from the same height, would they both hit the ground a the same time?
Of course on Earth t... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, gravity",
"url": null
} |
matlab, finite-impulse-response, linear-phase
Is this the correct way of converting an FIR to a linear-phase FIR impulse response?
How would one negate the phase so the FIR becomes linear-phase? Converting an arbitrary FIR filter into a linear-phase FIR with the same magnitude response is generally impossible. As me... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "matlab, finite-impulse-response, linear-phase",
"url": null
} |
urdf, ros-hydro
Title: Loading an urdf model from the parameter server with hydro
Migrating from groovy to hydro, I encountered the following problem:
When I try to load an urdf model from the parameter server with the following code:
urdf::Model urdfModel;
if(!nh.hasParam(urdfName))
{
return;
}
if(!urdfModel.ini... | {
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"id": 18172,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "urdf, ros-hydro",
"url": null
} |
quantum-mechanics, particle-physics, superposition
Title: Can you tell if a particle is in superposition? This may be an easy answer for anybody. Is it possible to detect if a particle A is still in a superposition via the sending a group of particles B through a box containing particle A? Not really.
There is Quantu... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, particle-physics, superposition",
"url": null
} |
c#, html, parsing
HtmlDocument htmlDocument = new HtmlDocument();
htmlDocument.LoadHtml(htmlToParse);
int fieldId = default( int );
Dictionary<int,string> fieldValuesTable =
(
from
htmlNode in htmlDocument.DocumentNode.DescendantNodes()
where
htmlNode.Name.Equals( ElementToParse, StringCompa... | {
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"openwebmath_score": null,
"tags": "c#, html, parsing",
"url": null
} |
black-holes, event-horizon, singularities, tidal-effect
For an object just crossing the event horizon of a black hole of radius $r$, we have $M = c^2 r/2G$, and so this becomes
$$
F_\text{tidal} = \frac{m c^2 d}{2 r^2}
$$
For a black hole of radius $r = 3$ km and an atom ($d = 10^{-10}$ m, $m = 10^{-27}$ kg), this for... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "black-holes, event-horizon, singularities, tidal-effect",
"url": null
} |
machine-learning, deep-learning, data-mining, statistics, logistic-regression
3) Run a logistic regression (Statsmodel logit or Scikit-learn?)
Do we always have to predict the outcome class to know the risk factors that lead to admission/hospitalization?
5) Then identify the significant risk factors based on p-value... | {
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"tags": "machine-learning, deep-learning, data-mining, statistics, logistic-regression",... |
object-oriented, game, objective-c
-(instancetype) init {
self = [super init];
if (self) {
_deck = [[NSMutableArray alloc]init];
_hand = [[NSMutableArray alloc]init];
}
return self;
}
-(void) drawStartingHand {
for (int i = 0; i < kStartingHandSize; i++) {
[self drawCardFro... | {
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"openwebmath_score": null,
"tags": "object-oriented, game, objective-c",
"url": null
} |
c#, json, generics, dynamic-programming, .net-core
dynamicObject["d", "sa"] += 5;
dynamicObject["d", "sa"] = new { dz = "ABA", zz = "WCC", ZXXX = new { Y1 = "1", Y2 = "2" } };
dynamicObject["parent", "node"] = "New field";
dynamicObject["parent-node", "node-lvl1", "node-lvl1.1"] = "P > 1 > 1... | {
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"openwebmath_score": null,
"tags": "c#, json, generics, dynamic-programming, .net-core",
"url": null
} |
ros, navigation, odometry, pose, nav-msgs
Originally posted by pineconetree on ROS Answers with karma: 1 on 2013-07-11
Post score: 0
Original comments
Comment by thebyohazard on 2013-07-11:
Have you tried using the rostopic command line tool to manually publish odom messages? That lets you know if your node works or ... | {
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"tags": "ros, navigation, odometry, pose, nav-msgs",
"url": null
} |
fft, discrete-signals, signal-analysis, fourier-transform, cross-correlation
When you add noise to $x(t)$ and $y(t)$ in your second experiment you're adding "signal content" to the frequencies outside $w=w_1$. Since the noise contributions are drawn independently, they are uncorrelated which means that $P_{xy}(w)$ wil... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fft, discrete-signals, signal-analysis, fourier-transform, cross-correlation",
"url":... |
newtonian-mechanics, drag, aerodynamics, air, free-fall
The answer depends a LOT on the purpose of the parachute and a lot less on fundamental physics.
For cargo chutes, where the rate of deceleration isn't a major issue, the answer is pretty much how long the lines are times about two. The chute pulls out, typically ... | {
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"tags": "newtonian-mechanics, drag, aerodynamics, air, free-fall",
"url": null
} |
quantum-mechanics, quantum-field-theory, statistical-mechanics, symmetry-breaking, thermal-field-theory
Quantum fluctuations can work the same way. For the same particle in a double well potential, the quantum ground state is actually equally distributed between the two wells. The quantum fluctuations, which lead to... | {
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"tags": "quantum-mechanics, quantum-field-theory, statistical-mechanics, symmetry-breaking,... |
homework-and-exercises, electromagnetism, magnetic-fields
Title: Magnetic field intensity in centre of square shaped wire I have 1m($l$) long wire which is bent into square. Through it flows 10A($I$) strong current. I have to calculate magnetic field intensity in centre of square.
Assuming my trig calculations are co... | {
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"tags": "homework-and-exercises, electromagnetism, magnetic-fields",
"url": null
} |
quantum-algorithms, quantum-state, programming, experimental-realization, embedding
$$
| \boldsymbol{x} \rangle \propto \sum_i x_i | i \rangle
$$
There is no equals sign because the state needs to be normalized, but for the understanding this is not important. The special thing about this particular embedding is that ... | {
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"tags": "quantum-algorithms, quantum-state, programming, experimental-realization, ... |
However, you of course cannot do crazy stuff like claiming that $$\lim_{x\to0-} \frac{x\sqrt{x}}{\sqrt{x}} = \lim_{x\to0-} x = 0$$ because here you modify the domain of the function in more than finitely many points. | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.98593637543616,
"lm_q1q2_score": 0.8380175001530411,
"lm_q2_score": 0.849971175657575,
"openwebmath_perplexity": 541.5955277395431,
"openwebmath_score": 0.9756428003311157,
"tags":... |
digital-communications
Title: What is the coherence bandwidth of the channel? I read the following sentence. "In wideband systems, the transmission bandwidth of a single channel is much larger than the coherence bandwidth of the channel." What is 'coherence bandwidth of the channel'? If you have a multipath channel... | {
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"tags": "digital-communications",
"url": null
} |
slam, navigation, rostopic
freenect.launch
https://github.com/ros-drivers/freenect_stack/blob/master/freenect_launch/launch/freenect.launch
<!-- Entry point for using OpenNI devices -->
<launch>
<!-- "camera" should uniquely identify the device. All topics are pushed down
into the "camera" namespace, and it ... | {
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"tags": "slam, navigation, rostopic",
"url": null
} |
quantum-mechanics, operators, linear-algebra, eigenvalue
In turn you have the expression $$
f(x) ={-1} + \sum_{k=1}^n\frac{\chi_k(x)}{\chi_k(c_k)},
$$you can now appreciate the claim that $$
f(c_\ell)
={-1} + \sum_{k=1}^n\delta_{k\ell}={-1} +1=0.$$ | {
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"tags": "quantum-mechanics, operators, linear-algebra, eigenvalue",
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c++, c++11, memory-management, pointers, smart-pointers
// Recycle: call the allocated object's destructor, but do not deallocate memory
// Instead, store the pointer to the allocated memory block for reuse
void recycle(TBase* mPtr) noexcept(noexcept(alloc.destroy(mPtr)))
... | {
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"tags": "c++, c++11, memory-management, pointers, smart-pointers",
"url": null
} |
quantum-mechanics, homework-and-exercises, quantum-chemistry
The equation has solutions x = -2 and 2 and -1 (doubly degenerate) and 1 (doubly degenerate)
As for x = -2 and 2 they correspond to maximum and minimum energy states.
My question rises for x = -1 and +1 states. So, they are doubly degenerate, it means that ... | {
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"url": null
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Now use Goldstine's theorem to approach $$F$$ by $$B(X)$$. For each $$N$$ and $$\epsilon>0$$ fixed. By Goldstine's theorem, there exists $$x=x(N,\epsilon) \in B(X)$$, such that $$|F(f_n)-f_n(x)|< \epsilon, \text{for all n=1,2,...,N}.$$ This implies $$\sum_{n=1}^N |F(f_n)|\leq \sum_{n=1}^N |f_n(x)|+N\epsilon \leq C+N\ep... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759615719876,
"lm_q1q2_score": 0.8317511922651891,
"lm_q2_score": 0.8479677602988601,
"openwebmath_perplexity": 141.18880049336084,
"openwebmath_score": 0.9861900210380554,
"ta... |
Same as we just did in the last case, the sum of the cubes of the first $n$ positive integers is \begin{aligned} \sum_{i=1}^{n} k^3 &=\sum_{i=1}^{n} \binom{k}{3} + 4\sum_{i=1}^{n} \binom{k+1}{3}+\sum_{i=1}^{n} \binom{k+2}{3}\\ &= \binom{n+1}{4}+4\binom{n+2}{4}+\binom{n+3}{4}\\ &=\frac{1}{4}(n^4+2n^3+n^2) \end{aligned}
... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9658995742876885,
"lm_q1q2_score": 0.8170954400681838,
"lm_q2_score": 0.8459424373085146,
"openwebmath_perplexity": 448.53102314873036,
"openwebmath_score": 0.8942179083824158,
"ta... |
ros, ros-kinetic
I would like to know how to fix this. Please advise.
Originally posted by JoshuaSiy on ROS Answers with karma: 23 on 2019-07-22
Post score: 2
It seems that Eigen::internal::real_2x2_jacobi_svd funtion is defined twice.
Please reinstall Eigen.
As shown in the following commit, it seems to move the fu... | {
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"openwebmath_score": null,
"tags": "ros, ros-kinetic",
"url": null
} |
qiskit, programming, ibm-q-experience, hhl-algorithm
matrix_A = np.array([[1.5, 0.5],[0.5, 1.5]])
vector_b = [0.9010, -0.4339]
#x = A^(-1)b = [0.78420, -0.55066] #expected result
processor = Aer.get_backend('statevector_simulator')
no_ancillas = 3 #number of ancilla qubits
no_time_slices = 50 #number of timeslices i... | {
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"tags": "qiskit, programming, ibm-q-experience, hhl-algorithm",
"url": null
} |
localization, imu, navigation, gps, robot-localization
</node>
</launch>
Originally posted by geewhiz on ROS Answers with karma: 1 on 2017-07-05
Post score: 0
Original comments
Comment by Sid05 on 2022-05-09:
Hi.
You mention this in your navsat transform parameter,
<param name="use_odometry_yaw" value="true"/>
is ... | {
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"tags": "localization, imu, navigation, gps, robot-localization",
"url": null
} |
molecular-biology, synthetic-biology
Title: Has anyone tried Gibson Assembly Optimizations? Has anyone tried the chew back-anneal in vitro DNA assembly method (known as Gibson Assembly) for difficult sequences, like GC-rich sequences? How big constructs could you efficiently assemble? Did you use the original protocol... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "molecular-biology, synthetic-biology",
"url": null
} |
human-biology, human-physiology, menstrual-cycle, ovulation
Coagulation & Fibrinolytic Pathway in 5 minutes - Simple and Easy
Fibrinolysis Wikipedia | {
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$\blacksquare$
## Proof by Telescoping Sum
Observe that:
$\displaystyle \sum_{i \mathop = 1}^n \paren {\paren {i + 1}^2 - i^2}$ $=$ $\displaystyle -\sum_{i \mathop = 1}^n \paren {i^2 - \paren {i + 1} ^2}$ $\displaystyle$ $=$ $\displaystyle -\paren {1 - \paren {n + 1}^2}$ Telescoping Series $\displaystyle$ $=$ $\dis... | {
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python, motifs, phylogenetics
Following is a subset of "MotifSeqAligned.fasta" containing the aligned sequences used to build the trees:
>ProfileCluster0.meme
---SSNDTTTCCAGGAAD-
>ProfileCluster1.meme
YBNRD---TTCYYGGAAT-
>ProfileCluster10.meme
---VDKDWTTCTYGGAAT-
With the 3 corresponding logos:
The full "MotifSeqAli... | {
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# How to follow matrix operations in proofs?
I'm a software engineer trying to learn linear algebra and feel like I'm having a hard time following matrix computations.
For example, this is a part of the least squared method for linear model:
$$\sum\limits_{i=1}^n ||\mathbf\theta^T\mathbf x_i-y_i||^2=(\mathbf{X\theta... | {
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java, performance, trie
if(current.getTerminal() && current.getOutDegree() == 0){
System.out.println(word);
}
// Our child is not a word yet, we iterate though again
else {
// Iterate through all potential letters, looking for the next child
for(int i = 0; i < 26; ... | {
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If n = 5, your formula gives 20 + 20 + 5 = 45, while there are in fact 17 nonzero elements.
Here's a formula that does work: n + (n - 2) + (n - 4) + ... + 3 + 1 + 3 + ... + (n - 4) + (n - 2) + n.
That's the same as 2[n + (n - 2) + (n - 4) + ... + 3] + 1. You might be able to rearrange that to a closed form summation.... | {
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"openwebmath_score": 0.6681009531021118,
... |
python, python-3.x, parsing
def _validate_params(line: str) -> Tuple[int, List[float]]:
"""
Check if given line is valid param line, which are
an integer followed by one or more floats seperated by whitespace
"""
split = line.split()
id_ = split[0]
coeffs = split[1:]
if not id_.isdecima... | {
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"tags": "python, python-3.x, parsing",
"url": null
} |
enum, rust
match self {
Scanning(mut pid_to_query, mut csv_writer) => {
match analyze_line(&line) {
Ignore => Scanning(pid_to_query, csv_writer),
QueryStart(pid, query_begin) => {
let query_parts = vec![query_begin];
... | {
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"openwebmath_score": null,
"tags": "enum, rust",
"url": null
} |
5) Stephanie rearranged the letters in the word # TOGETHER# and formed new words beginning with R and ending with T. In how many ways can this be accomplished? 3. How many ways can 5 paintings be line up on a wall? 3. As the number of things (letters) increases, their permutations grow astronomically. Selecting a 4-dig... | {
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"lm_q2_score": 0.8596637451167997,
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"openwebmath_score": 0.5433921813964844,
"tags":... |
gauss-law
In introductory physics texts only the field along the axis going through the center, if not just in the center, is treated as an example. For of-axis points the integrals require a lot more work and are left for advanced treatements. But this does not mean that the field does not exist outside the plane or ... | {
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"tags": "gauss-law",
"url": null
} |
If $d$ divides $a+b$ and $d$ divides $ab$, then $d$ divides $a(a+b)-ab = a^2$. Similarly, $d$ divides $b^2$. Thus $d$ divides $(a^2,b^2$). But $(a^2,b^2) = (a,b)^2 = 1$, so $d=1$.
Yet another approach: it's straightforward to show that $(i, jk) | (i,j)\cdot(i, k)$. It's also a classic theorem of the GCD that $(m, n) =... | {
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"openwebmath_score": 0.9396748542785645,
"tags... |
homework-and-exercises
If the balloon is bigger, the time that the toy can hover will increase - by a surprisingly large amount. Using the result from my other answer that pressure (and thus flow rate) scales with $1/r^2$, and volume scales with $r^3$, then time (which is the time it takes for the balloon to deflate) ... | {
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lab-techniques
$$\begin{array}{|l|c|c|} \text{Condition} & \text{Temp (°C)} & \text{Time (approx.)} \\ \hline
\text{Super-cooled freezer} & \text{-80} & \text{1 - 10 years} \\
\end{array}$$
For ATCC, the shelf life is even shorter : | {
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general-relativity, differential-geometry
Title: Isometry between Minkowski space and Tangent space In this notes Geometric Wave Equations by Stefan Waldmann at page 70 they have
Having a fixed Lorentz metric $g$ on a spacetime manifold $M$ we can
now transfer the notions of special relativity, see e.g. 50 , to $... | {
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mars, impact, weather
Initial atmospheric effects: When the asteroid entered the Earth's atmosphere, it pressurized the atmosphere and caused faster than 1000 km/hr super-heated winds - https://www.lpi.usra.edu/science/kring/Chicxulub/regional-effects/ that blasted out in a 1500km radius. Since Mars's atmosphere at t... | {
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c++, algorithm, c++14, combinatorics
Here, I used the ForwardIterable concept which represents types that have forward iterators. You could then use std::size to compute the size of the container; for std::list, you would have a size in \$O(1)\$ for example while it does not have random-access iterators.
However, we'r... | {
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"url": null
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algorithms, optimization, permutations
For each $i$, we require that exactly one of the $x_{i,\tau}$ is 1.
We require that the product of the transpositions yields $\pi$, i.e., $y_{\ell,j,\pi(j)}=1$ for all $j$.
We require that the $x$'s and $y$'s are consistent, e.g.,
$$y_{i+1,j,k} = \bigvee_{\tau} y_{i,j,\tau^{-1}(k... | {
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organic-chemistry, acid-base, hydrocarbons, halogenation
waxes are the cause of undesirable processes of oxidation, resin
formation, and decomposition. Apart from free sulfuric acid,
derivatives such as sulfonic acids and acid esters may be present in
paraffin. These are equivalent to the mineral acid in chemica... | {
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mfb
Mentor
But this is only true for positive $x<1$.
Your logarithm is not defined otherwise, a vf where the logarithm is not defined cannot be a solution.
But does that have a solution at all?
Let $c=\frac{g}{\alpha}$, and using the inequality for the denominator, I get
$$v_0 + v_f \leq c \ln(1+v_0/c) + c \ln(1+v_f/... | {
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"openwebmath_score": 0.9385164380073547,
"... |
c#
class CommandButtonPropMask {
public bool HasForeColor { get; }
public bool HasBackColor { get; }
public bool HasVariousPropertyBits { get; }
public bool HasCaption { get; }
public bool HasPicturePosition { get; }
public bool HasSize { get; }
public bool HasMousePointer { get; }
publ... | {
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"url": null
} |
## Binomial Theorem
$$(a+b)^n = \sum_{i=0}^{n} \binom{n}{i} a^i b^{n-i}$$ where $\binom{n}{i}$ denotes the total number of different combinations of $i$ items chosen from within $n$ items. $$\binom{n}{i} = \frac{n!}{i!(n-i)!}$$
See wikipedia: binomial expansion visualization for geometry interpretation of binomial ex... | {
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"openwebmath_score": 0.9768717885017395,
"tags... |
virus
The size of animal cells however depends partially on the type of cell and its function. Red blood cells are pretty small in comparison to other animal cells, they don't need to divide (so do not own a nucleus) and need a large surface area in order to diffuse Oxygen efficiently. Egg cells for example serve to s... | {
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A polynomial $q:=q(X_1,\ldots, X_r)$ is a finite sum of monomials of the form $$a\ X_1^{x_1}\ X_2^{x_2}\ \cdots\ X_r^{x_r}\ ,$$ where $a$ and the $x_i$ are natural numbers. It follows that such a monomial can be encoded into the number $y:=\psi(a,x_1,x_2,\ldots, x_r)$. Do this for every monomial occurring in $q$, and y... | {
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"lm_q1_score": 0.9850429169195593,
"lm_q1q2_score": 0.8053459424503397,
"lm_q2_score": 0.817574471748733,
"openwebmath_perplexity": 247.10309310520032,
"openwebmath_score": 0.8898147940635681,
"tag... |
homework-and-exercises, newtonian-mechanics, energy, energy-conservation
Why does the author say that we would need to know the shape of the slide to find the time taken for the child to reach bottom of the slide? Can't we use Newton's first law of motion in uniform acceleration to find the time?
we can find velocity ... | {
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"url"... |
dna, nomenclature
Title: Has the acronym DNA ever been widely understood to stand for deoxyribose nucleic acid? I have a friend familiar with evolutionary biology who was recently bragging about how much he knows. I asked him what DNA stood for, and he answered it stood for 'deoxyribose nucleic acid'. When I claimed... | {
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a. Greater than 2
b. Between 1 and 2
c. Between 1/2 and 1
d.Between 1/4 and 1/2
e.Less than 1/4
You could learn a formula for such questions (this is an alternating geometric series), but you don't need to. It's almost always a good idea to write out at least the first few terms of a sequence- often you'll notice a pa... | {
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"lm_q2_score": 0.8539127566694178,
"openwebmath_perplexity": 901.0038358520754,
"openwebmath_score": 0.8301273584365845,
"tags": n... |
redox, titration
So the amount of titrant that reacted is always equivalent to the amount of analyte that reacted. At the equivalence point, this is equal to the total amount of analyte and the amount of titrant added. At other stages, there will be excess of analyte or titrant, so the law is valid for the amount that... | {
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} |
ros, buildfarm
Originally posted by gvdhoorn with karma: 86574 on 2022-05-10
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by ipa-hsd on 2022-05-10:
Yes we did use the keyword curlpp-dev. But for debian and ubuntu it gets resolved to libcurlpp-dev
Comment by gvdhoorn on 2022-05... | {
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∆x. it is denoted by r. I Calculating areas in polar coordinates. the basic formulas x = rcos(θ), y=rsin(θ), and r2 = x2 + y2 how to graph simple equations in polar coordinates. For example, x, y and z are the parameters that define a vector r in Cartesian coordinates: r =ˆıx+ ˆy + ˆkz (1) Similarly a vector in cylindri... | {
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"lm_q2_score": 0.8459424334245618,
"openwebmath_perplexity": 598.200690655468,
"openwebmath_score": 0.9244123101234436,
"tag... |
algorithms
Title: Infix to postfix by stack Convert in postfix
(((P+Q)(R+S))/T) +(A(B+C))
note : there is * between (P+Q) (R+s)
My attempt in image and size of stack = 15 given, but iam getting size =13 I don't know which way you are following to solve the problem. After seeing your problem I tried on the paper wi... | {
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} |
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