text stringlengths 1 1.11k | source dict |
|---|---|
matlab, filters
Title: Matlab - Using findpeaks with fvtool Is there any way I could utilise findpeaks in conjunction with fvtool? I would like to know where on the frequency axis the maximum and minimum of my frequency response happens. fvtool is interactive so it doesn't let you recover an data in a script. Fortunat... | {
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"tags": "matlab, filters",
"url": null
} |
mavros
Originally posted by vooon with karma: 404 on 2015-11-04
This answer was ACCEPTED on the original site
Post score: 1 | {
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"tags": "mavros",
"url": null
} |
quantum-mechanics, homework-and-exercises, perturbation-theory
From this we conclude that the exact eigevalues of $AL^2+BL_z+CL_y$ are the ones of $AL^2+NL_z$:
$$Al(l+1)+Nm\:, \quad l=0,1,2,\ldots \quad m = \pm l$$
the same eigenvalues as for $H_0$ with $B$ replaced for $N$. | {
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"url": null
} |
ros
// ... and downsampling the point cloud
const float voxel_grid_size = 0.005f;
pcl::VoxelGrid<pcl::PointXYZ> vox_grid;
vox_grid.setInputCloud (cloud);
vox_grid.setLeafSize (voxel_grid_size, voxel_grid_size, voxel_grid_size);
pcl::PointCloud<pcl::PointXYZ>::Ptr tempCloud (new pcl::PointCloud<pcl::PointXYZ>... | {
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# Integrate $x^2 e^{-x^2/2}$
Is it possible to integrate $$\int_0^{\infty} x^2 e^{-x^2/2}\, \mathrm dx$$ by hand?
The answer is $$\frac{1}{2\sqrt{2}}$$ My apologies if this does not meet the standards of this blog. I will delete it if requested.
• Try to do it by parts twice...or even once. – DonAntonio Sep 30 '16 a... | {
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quantum-field-theory, dimensional-analysis, scattering-cross-section, s-matrix-theory
In particular, the mass dimension certainly does not depend on the loop order that is needed to generate $A_n$, and so one is free to determine $[A_n]$ by reasoning with tree-level amplitudes only, and Huang and Elvang do so.
But le... | {
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quantum-mechanics, gravity, water, surface-tension
Because the force of surface tension is trying to minimize the surface, not the thickness of water, since surface tension acts like a rubber sheet covering it and trying to pull it all together.
In case of the contact angle being $\theta = 180^°$, when the surface doe... | {
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"tags": "quantum-mechanics, gravity, water, surface-tension",
"url": null
} |
ros, message, ros-electric, publisher, roscpp
Originally posted by Ben_S with karma: 2510 on 2013-03-27
This answer was ACCEPTED on the original site
Post score: 3 | {
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"tags": "ros, message, ros-electric, publisher, roscpp",
"url": null
} |
-
Suppose you have $500$ white balls and $500$ black balls, and you are interested in the probability of drawing $P$ white balls from a sample of $100$ taken without replacement. This probability is given by the hypergeometric distribution, and $$\mathbb{P}(P \text{ white balls})=\frac{{{500}\choose{P}}{{500}\choose{1... | {
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"ta... |
Hence, square roots of $$z$$ are $$(1+\sqrt{3}/2i)\frac{7}{\sqrt{1+3/4}} = \sqrt{7}(2+\sqrt{3}i)$$ and $$(1-2/\sqrt{3}i)\frac{7}{\sqrt{1+4/3}} = \sqrt{7}(\sqrt{3}-2i)$$.
That the square roots are $$\pm(\sqrt 3 + 2i)$$ can be seen by elementary algebra and trigonometry as follows. \begin{align} & \left|-1 + i4\sqrt 3\r... | {
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"lm_q2_score": 0.8397339736884711,
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"openwebmath_score": 0.985207736492157,
"tags... |
special-relativity, mass, inertia
Title: What are the "masses"? I know there are three "masses".
"inertial mass", based on Newtonian Mechanics
"rest mass" and "relativistic mass", based on relativity
Anyone can explain three of these in a relatively easy way? I'm confused Newtonian inertial mass is based Newtonian mec... | {
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quantum-mechanics, hilbert-space, vectors, linear-algebra, notation
You understand that kets are vectors in a Hilbert space. You can think of a vector in a Hilbert space like a point in an N-dimensional space, or like an ordered set of N complex numbers.
Obviously, you can create a function of $N$ complex numbers like... | {
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"url": nul... |
In the Windows calculator, your example works fine, but: sin(0.0000000000000001) = tan(0.0000000000000001) = 1.7453292519943295769236907684886e-18
The difference is in the mantissa (the first part), which cannot properly represent such tiny sines and tangents. It needs more digits because that's where the difference b... | {
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homework-and-exercises, newtonian-mechanics, newtonian-gravity, orbital-motion, velocity
Title: Mathematical model for this graph of a simplified binary star system? Unnecessary background for question: I had a school assignment asking us to relate a quadratic equation to a real life example relating to our future dre... | {
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"tags": "homework-and-exercises, newtonian-mechanics, newtonian-gravity, orbital-motion, vel... |
• Cheers, this works. However, I don't see what you mean by "10 sets of samples"? – user1546083 May 6 '13 at 19:53
• It should be "10 samples," I'll edit momentarily to clarify. Each "sample" has 10 flips, so 100 flips = 10 samples of 10 flips each. – xisk May 6 '13 at 19:54
• $100$ corresponds to $91$ samples, since y... | {
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"openwebmath_score": 0.8412942886352539,
"ta... |
discrete-signals
$$\mathrm{SNR} = \frac{2|X_\omega|^2}{\frac{1}{N}\sum_{k=0}^{N-1}x[k]^2 - X_0^2 - 2|X_\omega|^2}$$
Bias correction
With white additive noise, the above coherent sampling SNR estimate will be optimistically biased, because some of the noise power is subtracted from itself by hiding in the three DFT bin... | {
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"tags": "discrete-signals",
"url": null
} |
$$\frac{2x + 4}{3x + 4} = \frac{5}{7}$$
Or, $$14x + 28 = 15x + 20$$
Or, $$x = 8$$
Now, we know $$3x - 2x = x = 8$$
So, The answer must be (A) 8
_________________
Thanks and Regards
Abhishek....
PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS
How to use ... | {
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"openwebmath_score": 0.6929139494895935,
"tags": ... |
quantum-mechanics, particle-physics, wavefunction, antimatter, cpt-symmetry
$C\phi =\phi^{\ast}$
Our 1-particle solutions we developed $\hat\phi$ in all fulfill the K-G-equation, of course they should:
$(\Box + m^2)e^{-ipx} =0$ and $(\Box + m^2)e^{ipx} =0$
In particular we observe $Ce^{-ipx}= (e^{-ipx})^{\ast}= e... | {
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"tags": "quantum-mechanics, particle-physics, wavefunction, antimatter, cpt-symmetry",
"u... |
python, object-oriented, python-3.x, json, tkinter
"priest", "driver", "teacher", "doctor", "grandparents"
]
},
"question2": {
"question": "What is the meaning of 'بنت' in English?",
"arabic": "بنت",
"transliteration": "bint",
"answer": "girl"... | {
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"openwebmath_score": null,
"tags": "python, object-oriented, python-3.x, json, tkinter",
"url": null
} |
inorganic-chemistry, crystal-structure
Can anyone help me out? At Geoff's request I'll make comments into an answer:
Since it is a multi-component system you need to think of a crystal structure with a basis. Not surprisingly, the basis here is $\ce{ABO3}$. In your picture from Wikipedia, start with just the blue atom... | {
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What's the maximum number of (maximal) collinear sets of points in a set of n points in the plane? It can grow quadratically as a function of N. Consider the n points of the form: (x, y) for x = 0, 1, 2, and 3 and y = 0, 1, 2, ..., n / 4. This means that if you store all of the (maximal) collinear sets of points, you w... | {
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"lm_q2_score": 0.9230391595405136,
"openwebmath_perplexity": 669.1917830883792,
"openwebmath_score": 0.464359849691391,
"tags": n... |
gt.game-theory
Title: How to prove the existence of a pure Nash equilibrium? I have a game as given by the table below. I would like to prove that the game has always at least one pure Nash equilibrium (NE). I used a computer program and in fact the game has a pure NE. So, I am claiming the existence of at least one p... | {
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"tags": "gt.game-theory",
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} |
Last edited: Apr 2, 2009
10. Apr 2, 2009
### reb659
Phew! I was scared I had gotten it wrong again for a second. Thanks for all your help!
11. Apr 7, 2009
### reb659
Gah! I actually got the answer from the professor today and it turns out the answer was 1638.79. I could have sworn I did it right....
Anyone see th... | {
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"tag... |
java, serial-port
sw.out.write(b);
} catch (IOException e) {
// Do something to handle the exception
e.printStackTrace();
}
}
});
JButton alarm2Button = new JButton("Alarm 2");
alarm2Button.addActionListener(new java.awt.event.ActionListener(... | {
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c++
If you needed to use new, you would pass the arguments like this:
resource* p = new resource(name,id);
However, I think what you really want here is just a vector<resource>. You don't need to write a container class that stores a dynamically allocated array and its size — there are containers ready available in t... | {
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"tags": "c++",
"url": null
} |
classification, scikit-learn, multiclass-classification, class-imbalance
Title: Balanced Linear SVM wins every class except One vs All I am training a normal and a balanced Linear SVM using imbalance data, and testing both using F1-score.
(By balanced Linear SVM, I mean that each observation has a weight inverse to it... | {
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"tags": "classification, scikit-learn, multiclass-classification, class-imbalance",
"ur... |
c, algorithm, parsing, lookup, c99
continue;
} ... | {
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ros, add-dependencies, packages, dependencies
--include
--src
--CMakeLists.txt
--package.xml
--action2
--include
--src
--CMakeLists.txt
--package.xml
--main_file
--config
--launch
--include
--src
--CMakeLists.txt
--package.xml | {
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3
The set $f(A)$ contains at most $|A|$ elements. If $f(A)=B$ then $|A|\ge |f(A)|=|B|$.
3
It is meaningless to say that "$n$ takes $\pm \infty$" so long as $n\in \mathbb{N}$ simply because $\pm \infty \not \in \mathbb{N}$. So if $n$ is finite then the Induction Principle says that the integer $n$ can be reached star... | {
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"openwebmath_perplexity": 150.32774871007192,
"openwebmath_score": 0.9476624727249146,
"ta... |
optics, spectroscopy, optical-materials
$$\frac{A (\omega)}{R (\omega)}=\frac{D_A (\omega)}{D_R (\omega)}.$$ | {
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"tags": "optics, spectroscopy, optical-materials",
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c++, algorithm
Title: String permutation using iteration and a filter I'm looking to improve my skills as a developer so I recently challenged myself to design a string permutation generator without recursion. To add to the algorithm I also decided that the string should have a filter to it. An example of a filter wou... | {
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"tags": "c++, algorithm",
"url": null
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Somebody should check the argument below because I'm still terribly sleepy but it looks like you can get away with simple dynamic programming. Indeed, let's go from the left and see what's going on. First we are forced to connect the leftmost point with the next point in the other set. That creates certain length and a... | {
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"openwebmath_score": 0.8569661378860474,
"tags"... |
machine-learning, regression, overfitting
Remove features with a correlation >0.9 and remove any features with >50% missing data (this is hard to strengthen, a lot of genetic features simply have missing data for a lot of under studied genes in biology)
Have no imputation to avoid imputation bias, and since xgboost ac... | {
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"tags": "machine-learning, regression, overfitting",
"url": null
} |
classical-mechanics, friction, oscillators, dissipation
&- A \text{ is the initial amplitude} \\
&-\gamma \text{ is the decay rate} \\
&-\omega \text{ is the natural frequency} \\
&-\phi \text{ is the initial phase angle}. \end{split}$$
This makes perfect sense to me and I understand all the variables. However, I h... | {
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quantum-mechanics, homework-and-exercises, angular-momentum, hilbert-space
Also, if it's not asking too much may I have a table of conversions in easy to read summary list format? (I can do this part if it's too much to ask.) There is a pattern. If you fix the eigenbasis of $S_z$ you have for any up $+$ or down $-$ e... | {
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"ur... |
c++, algorithm, object-oriented, stl, machine-learning
/**
* Construct a record from the provided predictor Vector and target outcome.
*/
Record::Record(const Vector& predictor, double target) :
predictor_(predictor), target_(target) {
}
/**
* Construct a record by parsing the provided string. The string must ... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, algorithm, object-oriented, stl, machine-learning",
"url": null
} |
lagrangian-formalism, gauge-theory, quantum-chromodynamics, yang-mills, wick-rotation
Title: How to Perform Wick Rotation in the Lagrangian of a Gauge Theory (like QCD)? I'm studying Lattice QCD and got stuck in understanding the process of going from a Minkowski space-time to an Euclidean space-time. My procedure is ... | {
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"tags": "lagrangian-formalism, gauge-theory, quantum-chromodynamics, yang-mills, wick-rotat... |
python, array, set
def get_unknown_data_relations(expected_data_relations_paths, real_data_relations_paths):
"""
Obtain all those fields which are expected to be data_relations but they are not.
This function does not check afterwards the real_data_relations_paths, if a expected_data_relations_paths
i... | {
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"tags": "python, array, set",
"url": null
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cc.complexity-theory, fl.formal-languages, polynomial-time
(Acknowledgement: The second consequence of these two was pointed out by Yuval Filmus at https://cs.stackexchange.com/questions/69614/) If $\mathrm{P\subseteq CSL}$, then $\mathrm{P\subseteq DSPACE}(n^2)$. By a padding argument, this implies
$$\mathrm{DTIME}(t... | {
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"tags": "cc.complexity-theory, fl.formal-languages, polynomial-time",
"url": null
} |
general-relativity, black-holes, metric-tensor, coordinate-systems, kerr-metric
Title: Schwarzschild and Kerr solution in $(x, y, z, t)$ coordinates? The Schwarzschild solution ('simple' black holes) and the Kerr solution (rotating black holes) are very well known in General Relativity.
The coordinates which are used ... | {
"domain": "physics.stackexchange",
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"tags": "general-relativity, black-holes, metric-tensor, coordinate-systems, kerr-metric",
... |
newtonian-mechanics, newtonian-gravity, mass, drag, speed
You'll notice that the time to fall a given distance always increases with increasing values of $r$. So the larger an object's value of $\frac{CA\rho}{2m}$, the longer it takes to fall. Conversely, an object with a smaller ratio of cross-sectional area to mass ... | {
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"openwebmath_score": null,
"tags": "newtonian-mechanics, newtonian-gravity, mass, drag, speed",
"url": null
} |
algorithms, dynamic-programming
Suppose it’s nearing the end of the semester and you’re taking n courses, each with a final project that still has to be done. Each project will be graded on the following scale: It will be assigned an integer number on a scale of 1 to g > 1, higher numbers being better grades. Your goa... | {
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"openwebmath_score": null,
"tags": "algorithms, dynamic-programming",
"url": null
} |
rviz
Title: Rviz Client md5sum Error
I am running Ubuntu 14.04 and indigo on my host computer. I want to visualize some rviz visualization markers on my remote laptop. However, I cannot install Ubuntu 14.04 on my laptop since some hardware problems (too new?kabylake). So I installed Ubuntu 16.04 and kinetic instead. ... | {
"domain": "robotics.stackexchange",
"id": 27810,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "rviz",
"url": null
} |
machine-learning, hyperparameter, terminology
In machine learning, a hyperparameter is a parameter whose value is
used to control the learning process.
If we go by the definition of parameter in What's the difference between an argument and a parameter?, then a hyperparameter wouldn't be considered a value itself. Ra... | {
"domain": "datascience.stackexchange",
"id": 8068,
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"tags": "machine-learning, hyperparameter, terminology",
"url": null
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# How do I prove this?
1. Feb 26, 2005
### semidevil
find the limit
$$(3n)^{\frac{1}{2n}}$$ as n goes to infinity
just by eyeballing, I know that as the nget sufficiently large, the limit of the exponent will get to 0. and 3n to the 0 will be one....
im' sure on the exam, this wont work, and I dont know how to gi... | {
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"openwebmath_score": 0.7939852476119995,
"ta... |
genetics, human-genetics, population-genetics, fst
The difficulty here is in the phrasings fully representative of the genetic distance and correctly show. There is no correct (true) genetic distance among populations, there is only the statistics of genetic distance that one wants to define and those statistics are a... | {
"domain": "biology.stackexchange",
"id": 8940,
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"openwebmath_score": null,
"tags": "genetics, human-genetics, population-genetics, fst",
"url": null
} |
algorithms, distributed-systems, clocks
I think we could all agree that statement a happens before b but I would not say that "executing the assignment statement (event a) caused the program to execute the print statement (event b)". On the other hand I might say something slightly different: "event a, (assigning the... | {
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"openwebmath_score": null,
"tags": "algorithms, distributed-systems, clocks",
"url": null
} |
group-theory, representation-theory, lie-algebra, beyond-the-standard-model, grand-unification
Here we will argue at the level of Lie algebras $$su(3)\oplus su(2) \oplus u(1)\subseteq su(5).$$
In detail, we identify $su(5)$ with anti-Hermitian traceless $5\times 5$ matrices; $su(3)$ with anti-Hermitian traceless $3\ti... | {
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"openwebmath_score": null,
"tags": "group-theory, representation-theory, lie-algebra, beyond-the-standard-model, grand... |
information-theory, data-compression, entropy
Am I missing something (It would seem that the majority of random data should not be in fact incompressible)? What is the basis on which someone offers such a challenge and presumes it is entirely unwinnable for the player? | {
"domain": "cs.stackexchange",
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"tags": "information-theory, data-compression, entropy",
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} |
So you can't raise it from the dead, so to speak. You can't recover it when there's no A inverse. So we have to think, what shall A inverse do to this space here, where nobody's hitting it? So this would be the null space of A transpose. Because A-- sorry-- yeah, what should the pseudo inverse do? I said what should th... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.987946222968067,
"lm_q1q2_score": 0.8455349135177815,
"lm_q2_score": 0.8558511524823263,
"openwebmath_perplexity": 472.62105521153546,
"openwebmath_score": 0.7132152318954468,
"tags": null,
... |
c#, multithreading, exception-handling
private void WriteLog()
{
string directory = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), @"First Choice Software\Pronet Outlook");
string filePath = Path.Combine(directory, @"ErrorLog.txt");
if (... | {
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"openwebmath_score": null,
"tags": "c#, multithreading, exception-handling",
"url": null
} |
when is equipped with this topology and : → is any function where is a … In this case, every subset of X is open. How to gzip 100 GB files faster with high compression. The power set P(X) of a non empty set X is called the discrete topology on X, and the space (X,P(X)) is called the discrete topological space or simply... | {
"domain": "saiintermediazioniimmobiliari.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9553191309994467,
"lm_q1q2_score": 0.8300068311307583,
"lm_q2_score": 0.8688267660487573,
"openwebmath_perplexity": 841.1277476427841,
"openwebmath_score": 0.6290... |
climate, seasons
Title: Why does winter get colder after the solstice? Intuitively, it makes perfect sense to think that the coldest day of the year would be the day that gets the least sunshine, the winter solstice. In the northern hemisphere, this occurs a few days before Christmas. But as anyone who lives in plac... | {
"domain": "earthscience.stackexchange",
"id": 678,
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"lm_q1q2_score": null,
"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "climate, seasons",
"url": null
} |
java, algorithm, sorting, radix-sort
Entry.java:
package net.coderodde.util;
/**
* The wrapper class holding a satellite datum and the key.
*
* @param <E> the type of a satellite datum.
*/
public final class Entry<E> implements Comparable<Entry<E>> {
/**
* The sorting key.
*/
private final long... | {
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"tags": "java, algorithm, sorting, radix-sort",
"url": null
} |
gravity, speed
$$
p_i = mv + m_p v_p = m(v + 2v_p) + m_p v_p' = p_f
$$
Where $v_p'$ is the final velocity of the planet. We can isolate it:
$$
v_p' = \frac{mv + m_p v_p - m(v + 2v_p)}{m_p}
= \frac{m_p v_p - 2mv_p}{m_p}
= v_p - \frac{2m}{m_p}v_p
$$
Therefore, the variation of planet speed $\Delta v_p = v_p' ... | {
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"tags": "gravity, speed",
"url": null
} |
of a cyclic quadrilateral; it is the equality case of Ptolemy's Inequality.Ptolemy's Theorem frequently shows up as an intermediate step in problems involving inscribed figures. They have a number of interesting properties. A cyclic quadrilateral is a quadrilateral that can be inscribed in a circle. Cyclic Quadrilatera... | {
"domain": "godin44.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513881564147,
"lm_q1q2_score": 0.8342273011918814,
"lm_q2_score": 0.8459424295406088,
"openwebmath_perplexity": 264.72671918501953,
"openwebmath_score": 0.5283277034759521,
"tags": n... |
electric-circuits, electric-current, electrical-resistance, capacitance, signal-processing
Title: What exactly happens in a low and a high pass filter? I know the mathematics and equations behind the circuitry and how they tell us that the resistor blocks high frequency ac signals and allows low frequency ac signals t... | {
"domain": "physics.stackexchange",
"id": 39778,
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"tags": "electric-circuits, electric-current, electrical-resistance, capacitance, signal-pr... |
quantum-mechanics, hilbert-space, operators, observables, quantum-measurements
If it is so then, when and what triggers the $L$ operator to be applied to state $|A\rangle$? To simplify things, consider the Hilbert space $\mathcal H = \mathbb C^3$. Vectors in this space consist of triples of complex numbers, and linea... | {
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"tags": "quantum-mechanics, hilbert-space, operators, observables, quantum-measurements",
... |
javascript, node.js
function process(keywords, categories) {
keywords.forEach(obj =>
categories.forEach(({name, options} =>
obj[name] = options.every(({method, regex}) =>
method === 'include' ? obj.URL.includes(regex) : !obj.URL.includes(regex))
)
);
}
The two inner loops create new string... | {
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"tags": "javascript, node.js",
"url": null
} |
sam, samtools
Title: Potential side effects of replacing read group tags in BAM file I have a set of BAM files where the read group tags have some (default?) values, i.e.:
@RG ID:RG0 LB:LB0 PU:PU0 SM:SM0
This creates issues in my downstream analyses, where multiple BAM files with the same SM tag are used.
Samtools... | {
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"id": 2113,
"lm_label": null,
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"openwebmath_score": null,
"tags": "sam, samtools",
"url": null
} |
c#, performance, algorithm, heap, heap-sort
/// <summary>
/// Gets the index of right child of given index.
/// </summary>
/// <param name="index">Index to found right child index to.</param>
/// <returns> Index of the right child of the element with given index.</returns>
[Met... | {
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"tags": "c#, performance, algorithm, heap, heap-sort",
"url": null
} |
sampling, frequency
In this figure, the continuous curve represents the continuous-time signal $x(t)$ and the red squares represents samples of it at a rate of $F_s = 2.8571$ samples per second, or equivalently a period of $0.35$ seconds between two samples. So when asked to compute the rate of samples you would use t... | {
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"openwebmath_score": null,
"tags": "sampling, frequency",
"url": null
} |
quantum-gravity, loop-quantum-gravity
$$ \mathcal{H}_{eh} = N^a \mathcal{V}_a + N \mathcal{H} $$
where $N^a$ and $N$ are the lapse and shift vectors respectively which determine the choice of foliation for the $3+1$ split. $\mathcal{V}_a$ and $\mathcal{H}$ are referred to as the vector (or diffeomorphism) constraint a... | {
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"openwebmath_score": null,
"tags": "quantum-gravity, loop-quantum-gravity",
"url": null
} |
ros-fuerte, roscpp
Title: Undefined reference for string constant in service
Hi,
when I define a simple service, e.g.
string my_string
string CONST_STRING=some_value
---
I get an undefined reference to ...::CONST_STRING during linking. Looking at the generated header file, I noticed that CONST_STRING gets declared, ... | {
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"tags": "ros-fuerte, roscpp",
"url": null
} |
computability, turing-machines, undecidability, decision-problem, halting-problem
Gödel's incompleteness theorem gives you a specific such machine. Suppose that your proof system is $P$ (for example, ZFC), and consider the machine $M$ that goes over all possible proofs in $P$, searching for a proof of contradiction, a... | {
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"tags": "computability, turing-machines, undecidability, decision-problem, halting-problem",
"u... |
navigation, costmap
Comment by gvdhoorn on 2015-07-02:
Well if there were updates to move_base or any other involved pkgs, then that would be one thing to check. diff(1.12.3; 1.12.4) for move_base fi.
We recently fixed some nasty locking errors (and segfaults) in costmap_2d -- but it required changing the type of mut... | {
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"tags": "navigation, costmap",
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### Byte Strings¶
In order to understand what encode and decode do you need to know about a type of string that I haven’t mentioned yet. The b-string is used to express raw bytes. Raw bytes are a bunch of numbers. They can be converted to strings using an encoding.
Here’s how you specify a b-string. Each hexadecimal ... | {
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"lm_q2_score": 0.8418256452674008,
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"... |
c#, game, comparative-review, state-machine, state
public LogonSession(IPlayerConnection playerConnection, IMudConfiguration configuration, IPlayerRepository playerRepository, ISessionManager sessionManager)
{
_playerConnection = playerConnection;
_playerRepository = playerRepository;
_conf... | {
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"tags": "c#, game, comparative-review, state-machine, state",
"url": null
} |
ros-groovy
Title: How to install groovy-desktop-full on 12.04
Hi all,
I have problems installing groovy on my machine. I currently have fuerte installed. Without fuerte, it is the same situation. Is this a known situation?
sudo apt-get install ros-groovy-desktop-full
Reading package lists... Done
Building dependency... | {
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"tags": "ros-groovy",
"url": null
} |
python, algorithm, functional-programming
sorted_adjacent = sorted(graph.keys(), key=lambda r: -len(graph[r]))
return _paint(0, init(sorted_adjacent), 2)
This is the rest of the code, with an example graph input, which is defined as a simple dictionary with nodes as keys, and a list of nodes (the adjacent regions... | {
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"openwebmath_score": null,
"tags": "python, algorithm, functional-programming",
"url": null
} |
inorganic-chemistry, equilibrium, aqueous-solution, solutions, precipitation
I need to find concentration of $[\ce{PO4^3-}]$ via
$$[\ce{Al^3+}][\ce{PO4^3-}]=K_\mathrm{sp}$$
$$[\ce{Al^3+}]=\frac{\pu{0.002 mol}}{\pu{200 mL}}=0.01M$$
$$[\ce{PO4^3-}]=\frac{9.83\times 10^{-21}}{\pu{0.01M}}=9.83\times 10^{-19}$$
Then I can... | {
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"tags": "inorganic-chemistry, equilibrium, aqueous-solution, solutions, precipitation",
... |
3) That leaves the two $\left( x^2-x+1 \right)$ factors. They could split between the two dice or both could be on one die, leaving none on the other. We’ve already determined that each die already had to have one each of the x, $(x+1)$, and $\left( x^2+x+1 \right)$ factors. To also split the $\left( x^2-x+1 \right)... | {
"domain": "wordpress.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9907319878505035,
"lm_q1q2_score": 0.8962662254973889,
"lm_q2_score": 0.9046505376715775,
"openwebmath_perplexity": 980.6773426566747,
"openwebmath_score": 0.803494930267334,
"tags": n... |
### PeterO
ALL friction forces oppose the motion you are trying to cause - that gives you the direction.
Last edited by a moderator: May 5, 2017
3. Aug 15, 2011
### funoras
Last edited by a moderator: May 5, 2017
4. Aug 15, 2011
### PeterO
Looks like too many arrows to me. The friction in/at each pulley should me... | {
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"openwebmath_score": 0.61222904920578,
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c++, opengl
Node rootNode;
Node node;
Spatial spatial = Spatial(CreateMesh("res/models/Suzy.obj"));
Spatial spatial2 = Spatial(CreateMesh("res/models/Suzy.obj"));
rootNode.AttachChild(&spatial2);
node.AttachChild(&spatial1);
rootNode.AttachChild(node); | {
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"url": null
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orders that describe the ordering in a DAG. Topological Sort Introduction. A topological sort of a graph $$G$$ can be represented as a horizontal line ��� Consider the graph in the following example: This graph has two possible topological sorts: In this article, we have explored how to perform topological sort using B... | {
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"lm_q1_score": 0.9787126494483641,
"lm_q1q2_score": 0.8620472464077757,
"lm_q2_score": 0.8807970826714614,
"openwebmath_perplexity": 629.6850657722558,
"openwebmath_score": 0.3495599031448364,
"t... |
ros, macbook, packages
Title: Installing packages on Mac OS X
How can I install ROS package on Mac OS X?
This is the command used on Ubuntu system:
sudo apt-get install ros-jade-gmapping ros-jade-amcl ros-jade-map-server ros-jade-move-base ros-jade-rviz ros-jade-navigation
How can I install the same packages on my ... | {
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"openwebmath_score": null,
"tags": "ros, macbook, packages",
"url": null
} |
gps
Title: Using mapviz gpsfix vs navsatfix
Mapviz apparently uses GPSFix.It seems like most GPS nodes are still using NavSatFix which is a subset of the items in GPSFix.
Is there a mapping node between these two message types for Indigo?
In general is everything moving to GPSFix over NavSatFix?
Does mapviz somehow ... | {
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"tags": "gps",
"url": null
} |
ros, gps, ros-melodic
Title: How to give goal using robot localization
I've setup the move_base and and robot_localization and I'm getting Datum UTM coordinate is (483236.261047, 6674529.600528) when i launch the localization file.
How to know who's publishing these values and how to publish these values to move_bas... | {
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"tags": "ros, gps, ros-melodic",
"url": null
} |
spacetime, reference-frames, coordinate-systems
He goes on and talks about how theres also no origin for space in $\mathbb{E}$. But I'm also confused about this.
I understand the idea, of course, what I don't get is how you can mathematically model a space with no origin? My guess would be that $\mathbb E^n$ denotes E... | {
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"tags": "spacetime, reference-frames, coordinate-systems",
"url": null
} |
\begin{array}{|c|c|c|c|c|c|} \hline *& e & a & b \\ \hline e& e&a &b\\ \hline a& a& b&e\\ \hline b& b & e&a\\ \hline \end{array}
OK, so what we have now established is that there cannot be more than 1 solution.
But we have not yet established that this actually is a solution!
That is, if you look back at the proof, ... | {
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"lm_q2_score": 0.8519527963298947,
"openwebmath_perplexity": 96.0669347470483,
"openwebmath_score": 0.9977652430534363,
"tags... |
machine-learning, neural-network, deep-learning, dataset, cross-validation
processLevel2:
iterate each modelType:
train3, val3 = splitData(train2)
resultTrain3 = kfoldCV(processLevel3, train3)
...
remark: I'm not 100% sure about the algorithm, maybe I over-complicated it. I think it gives ... | {
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"tags": "machine-learning, neural-network, deep-learning, dataset, cross-validation",
... |
ros, turtlebot, keyboard-teleop
Originally posted by tfoote with karma: 58457 on 2012-04-09
This answer was ACCEPTED on the original site
Post score: 0 | {
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"tags": "ros, turtlebot, keyboard-teleop",
"url": null
} |
earth-history, world-building, natural-conditions
probability over time?
If this question is too hard to answer, I would also be interested in the first time (most distant) that a human could have survived their lifetime on Earth.
Assume that this human is someone like Bear Grylls, who is well trained to survive in na... | {
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"tags": "earth-history, world-building, natural-conditions",
"url": null
} |
experimental-physics, experimental-technique, interferometry
(2) If glass itself can partially reflect light through its index of refraction, what's the exact necessity for using a half-silvered mirror as opposed to a glass plate?
I have possible ideas to some of these questions, but I would like to know what others ... | {
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"tags": "experimental-physics, experimental-technique, interferometry",
"url": null
} |
standard-model, group-theory, group-representations, electroweak, isospin-symmetry
Physicists summarize this composition of irreps by 2 ⊗ 2 = 3 ⊕ 1 , formally identical to adding two spin 1/2s to get a spin 1 and a spin 0. The triplet is the symmetric part of the product, enforced by the symmetry structure of the isos... | {
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"openwebmath_score": null,
"tags": "standard-model, group-theory, group-representations, electroweak, isospin-symmetry... |
ros, kinect, pcl, callback, subscribe
Title: Subscriber not executing callback function to receive point cloud data from kinect
I have written a code to subscribe to the /camera/depth_registered/points topic to receive point cloud data from the kinect and then display it on a pcl::visualization::PCLVisualizer viewer.... | {
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"tags": "ros, kinect, pcl, callback, subscribe",
"url": null
} |
engineering-history, terminology, systems-engineering
Title: Is systems engineer an IT profession or an interdisciplinary field of engineering? The term Systems Engineer has always interested me as it generally involves many different fields of engineering.
Systems Engineer - Interdisciplinary
The definition I'm famil... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "engineering-history, terminology, systems-engineering",
"url": null
} |
meteor-shower
Title: Meteor shower predicted to be best viewed BEFORE midnight (for reasons other than the moon)? Reading that the Leonids meteor shower is almost upon us, I clicked some links (e.g. EarthSky.org and NatGeo) to read more of the prediction; especially the part about when to best view them.
I had a Déjà ... | {
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"tags": "meteor-shower",
"url": null
} |
performance, linux, assembly, x86, bigint
You could take this one step further and take advantage of 64bit-to-128bit multiplication to do it all in base 1018 for another 4x reduction in multiplications, but the resulting 128bit partial products are more complicated to deal with. I don't think you should do it.
There a... | {
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"tags": "performance, linux, assembly, x86, bigint",
"url": null
} |
is equal to 360 divided by the number of sides in the polygon. With respect to polygon, we have four important formulas. Please let me know what you think? Reduce the size of the polygon and see what happens to the angles Drag vertices to create irregular polygons. 30 terms . Now let us take some polygons and we will t... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.953966101527047,
"lm_q1q2_score": 0.8050473210817245,
"lm_q2_score": 0.8438951025545426,
"openwebmath_perplexity": 489.43304851731085,
"openwebmath_score": 0.39836597442626953,
"tags": n... |
cellular-respiration, respiration
Title: Role of ATP and AMP in functioning of Phosphofructokinase I know that when ATP is more then it inhibits PFK and hence regulate the number of ATP. But how does PFK reactivates itself? Is it due to removal of ATP from allosteric site that just reconfigures the enzyme back to norm... | {
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"tags": "cellular-respiration, respiration",
"url": null
} |
newtonian-mechanics, fluid-dynamics, harmonic-oscillator, spring, oscillators
Title: Harmonic oscillators in fluids and driven oscllations If given a normal spring/mass system and letting the mass oscillate in a fluid say water, would it be possible for the motion of the fluid, if the fluid is moving to create a drive... | {
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"tags": "newtonian-mechanics, fluid-dynamics, harmonic-oscillator, spring, oscillators",
... |
beginner, haskell, file-system
can give you more control. Alternatively, add a newtype around the list, e.g.
newtype WithNewlines t a = WithNewlines { unWithNewLines :: t a }
instance (Show a, Foldable t) => Show (WithNewlines t a) where
show = unlines . concatMap (pure . show) . unWithNewLines
and then use
putStr... | {
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"tags": "beginner, haskell, file-system",
"url": null
} |
c++, performance, algorithm, matrix, boost
ostream& operator<<(ostream& os, const Matrix& mx)
{
// a little hack I came up with to my output formatting
vector<int> vec;
for(int i = 0; i < mx.rows_num; ++i)
for(int j = 0; j < mx.cols_num; ++j)
{
int n = static_cast<int>(mx.data[... | {
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"tags": "c++, performance, algorithm, matrix, boost",
"url": null
} |
fluid-dynamics
Title: Mathematical model of a fluid: which viewpoint is the standard one? I've been studying fluid mechanics and I have some doubts on the mathematical model of a fluid. First we let $D\subset \mathbb{R}^3$ be a region in three-space filled with a fluid. This region has as many points as the real line.... | {
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"tags": "fluid-dynamics",
"url": null
} |
c#, linq
Your ParseData method's body could then look like this:
// Extract the information from the excel file
var excelData = file.GetWorksheetData(sheet: 0, rowStart: 2);
var monthlyRows = excelData.Rows.Where(r => (DateTime.FromOADate((double)r[EndDateCol]) - DateTime.FromOADate((double)r[StartDateCol... | {
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of the equations of the model presented in this paper to the equations of the mass spring damper model; both models can be reduced to a second order linear differential equation. The viscous damping force equation is similar to the spring force. equations with constant coefficients is the model of a spring mass system. Q... | {
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"openwebmath_score": 0.6562756896018982,
"tag... |
concrete, strength
I am asking this question because I want to get paid for the job. The control engineer (who signs the documents) is the one who is insisting that we have to wait until the 28-day test. With the exception of anything extremely unusual: the concrete will continue to gain strength until 28 days. In fac... | {
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"tags": "concrete, strength",
"url": null
} |
homework-and-exercises, potential-energy
First of all I want to check if I'm understanding how to get the potential energy when the vertical arms have the same radius $r$. If the tube is filled up to $h$, and adittionaly in one of the arms a block of water of height $y$ is put, then $U=\int_0^ydm\,gy'=\int_0^y\pi r^2d... | {
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"tags": "homework-and-exercises, potential-energy",
"url": null
} |
electromagnetism, potential, plasma-physics, stars, white-dwarfs
By constraining the fermions to have high density (with gravity in this case), you force electrons to occupy states well above zero momentum and kinetic energy, since the Pauli Exclusion Principle forbids more than one electron to occupy the same quantum... | {
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"openwebmath_score": null,
"tags": "electromagnetism, potential, plasma-physics, stars, white-dwarfs",
"url": null
} |
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