text stringlengths 1 1.11k | source dict |
|---|---|
x, y of real numbers. In this type of motion, an object is propelled forward in an upward direction forming an angle of θ. are called parametric equations, and generate an ordered pair (x (t), y (t)). Polar equations concern area and the meaning of derivatives. The following set of parametric equations describe x, dist... | {
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"openwebmath_score": 0.6091794371604919,
"tags"... |
beginner, array, rust
if i + 1 >= k {
match deque.front() {
Some(&x) => {
println!("max({:?}) = {}", &a[i+1-k..i+1], a[x]);
if x <= (i + 1 - k) {
deque.pop_front();
}
},
_ =>... | {
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"openwebmath_score": null,
"tags": "beginner, array, rust",
"url": null
} |
rotational-dynamics, reference-frames, rigid-body-dynamics, angular-velocity
We know the instantaneous angular velocity vector of the object written with respect to $P_1$, how do we compute the angular velocity vector respect to $P_2$? Additionally how do we compute the orientation of the object with respect to $P_2$ ... | {
"domain": "physics.stackexchange",
"id": 94459,
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"tags": "rotational-dynamics, reference-frames, rigid-body-dynamics, angular-velocity",
"... |
An equivalence relation is a relation that is reflexive, symmetric, and transitive It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. . CONTENTS v 5.5 Stronginduction. A Computer Science portal fo... | {
"domain": "northernarizonanews.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
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"lm_q1_score": 0.9481545304202039,
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"lm_q2_score": 0.8539127548105611,
"openwebmath_perplexity": 776.0495475125625,
"openwebmath_score": 0.63241159915924... |
quantum-field-theory, special-relativity
Title: A question from Weinberg QFT (Sec. 5.1) I'm studying QFT on Weinberg's book. And I have a question about its notation for Lorentz transformation property of the free fields (Chap.5).
In Sec. 5.1 of Vol. 1, annihilation fields $\psi_{\ell}^{+}(x)$ and creation fields $\ps... | {
"domain": "physics.stackexchange",
"id": 96727,
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"tags": "quantum-field-theory, special-relativity",
"url": null
} |
organic-chemistry, aromatic-compounds, halides
Ben Norris also mentions that the reaction of benzene with tetrachloromethane is used to produce chlorotriphenylmethane, and provided an Organic Synthesis procedure2 that works on the kilogram scale.
References | {
"domain": "chemistry.stackexchange",
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"tags": "organic-chemistry, aromatic-compounds, halides",
"url": null
} |
java, tree, console, library, ascii-art
private int checkPaddingLeft(int padding) {
return checkPadding(padding, "Left padding is invalid");
}
Seems like copy/paste code - could use use enum for Bottom/Left/Right/Top and use as input argument and have same code?
private SubtreeDescriptor printImpl(BinaryTreeNode... | {
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"tags": "java, tree, console, library, ascii-art",
"url": null
} |
quantum-mechanics, heisenberg-uncertainty-principle, signal-processing
His answer was: "It's the other way around, actually. All of signal processing comes from quantum physics."
And this seems like a copout to me. Why do we say that particles have wave properties, and not that waves have quantum properties? Is it fai... | {
"domain": "physics.stackexchange",
"id": 47418,
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"tags": "quantum-mechanics, heisenberg-uncertainty-principle, signal-processing",
"url": ... |
quantum-field-theory, mathematical-physics, dirac-delta-distributions
$$\int \phi(f_1)\ldots\phi(f_n)d\mu(\phi) = \int S_n f_1 \ldots f_n dx$$
where $dx$ is formally the Lebesgue measure.
However the above is only formal since $dx$ does not actually exist (there is no infinite dimensional Lebesgue measure that is coun... | {
"domain": "physics.stackexchange",
"id": 99683,
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"tags": "quantum-field-theory, mathematical-physics, dirac-delta-distributions",
"url": n... |
fourier-transform, homework, z-transform, reference-request, laplace-transform
As you are no doubt aware the Laplace transform gives us a description of a signal from it's moments, similar to how the Fourier transform gives us a description from phase and amplitudes.
Broadly speaking a moment can be considered how a s... | {
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"tags": "fourier-transform, homework, z-transform, reference-request, laplace-transform",
"url... |
evolution, natural-selection, population-dynamics, adaptation
Spread of more recessive alleles
Because recessive alleles can reach a relatively high frequency in the previous environment even if deleterious in the homozygote mutant.
Because recessive alleles represent little to no fitness variance at low frequency an... | {
"domain": "biology.stackexchange",
"id": 5277,
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"tags": "evolution, natural-selection, population-dynamics, adaptation",
"url": null
} |
quantum-mechanics, angular-momentum, symmetry, atomic-physics
\end{equation}
Here, $\phi_\mathrm{He}(\vec{r}_1,\vec{r}_2)$ is a state with a total angular momentum quantum number $L=0$. However, since it is in general not a product of single-electron wavefunctions the angular momenta of the two individual electrons ar... | {
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"tags": "quantum-mechanics, angular-momentum, symmetry, atomic-physics",
"url": null
} |
type-theory, polymorphisms
Title: Relationship between Higher Kinded Polymorphism, type inference, and Currying On Hacker News there is an interesting exchange about the async\await RFC for Rust.
The author of the proposal withoutboats is responding to a comment about the usage of async-await construct vs a monadic im... | {
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"tags": "type-theory, polymorphisms",
"url": null
} |
ros
[rosmake-3] Starting >>> tf [ make ]
[rosmake-3] Finished <<< tf ROS_NOBUILD in package tf
[ rosmake ] All 21 lineseleop_base: 0.2 sec ] ... | {
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random, graphics, asymptote
real mostInnerPopulation = 30;
real innerPopulation = 25;
real outerPopulation = 20;
real mostOuterPopulation = 15;
pair base = (0,0);
pair preMigrationCenter = (150, 125);
Utility functions:
Each point has three properties, collectively known as configuration, all of which have to be set... | {
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"tags": "random, graphics, asymptote",
"url": null
} |
inorganic-chemistry, redox, halides, noble-gases
Title: How does xenon react with O₂F₂? This reaction was asked in my college entrance exam. I searched through the entire Internet, but I couldn't find any papers/sources.
I suspect since O₂F₂ is a strong fluorinating agent, one of the xenon fluorides (XeF₂, XeF₄, or Xe... | {
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"tags": "inorganic-chemistry, redox, halides, noble-gases",
"url": null
} |
swift, ai, neural-network
let feedForward: FeedForwardResult = JPSNeuralNetwork.feedForward(...)
which is currently required to disambiguate between the two methods.
With regard to class functions or not: There are some "values" which
seem to be actually properties of the neural network, such as
activationFunction, c... | {
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"tags": "swift, ai, neural-network",
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} |
aerospace-engineering
Title: Can you change an asteroid's albedo to take it off a collision course? The amount of light that an object reflects is called its albedo; a scale of 0-1, 0 being a black body ad 1 reflecting all light. This question is probably going to be closed [It is "subjective" ?? No idea how] so I may... | {
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"id": 3014,
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"tags": "aerospace-engineering",
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} |
The result that one of the subgroups must be $G$ is correct. What goes wrong with your example is that the irrational numbers together with $0$ are not a subgroup of $\mathbb{R}$. For instance, $\pi$ and $1-\pi$ are both in this set, but their sum $\pi+(1-\pi)=1$ is not.
• so any union of proper subgroups cannot be $G... | {
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"openwebmath_score": 0.817218542098999,
"tag... |
cosmology, beyond-the-standard-model, fine-tuning, baryogenesis, leptogenesis
under sensible assumptions for the composition of the baryons in the Universe, you get an average number density of about $N_{\rm bar} = 0.11\,{\rm m}^{-3}$. Taking the ratio of the two number densities, you find that for every baryon, there... | {
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"tags": "cosmology, beyond-the-standard-model, fine-tuning, baryogenesis, leptogenesis",
... |
fluid-dynamics, pressure, bernoulli-equation
Title: Feeling low pressure fluid with high velocity In Bernoulli theorem physics we say that pressure is low when velocity is high but we feel pressure when fluid hits us why? This shows a misunderstanding of pressure in the Bernoulli relation as well as a misunderstandin... | {
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"tags": "fluid-dynamics, pressure, bernoulli-equation",
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1. $$P(E_4)$$
2. $$P(E_4|E_3)$$
3. $$P(E_4|E_2)$$
4. $$P(E_3|E_4)$$
• Let $$f(x) = \sin^{-1} (\sin (\pi x))$$. Find
1. f(2.7).
2. f'(2.7)
3. integral from 0 to 2.5 of f(x)dx
4. value of x for which f'(x) does not exist
• In some country number plates are formed by 2 digits and 3 vowels. It is called confusing if it has... | {
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"lm_q2_score": 0.822189134878876,
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"openwebmath_score": 0.6893108487129211,
"tags": nul... |
quantum-mechanics, born-rule
Now if there was a magnetic field those different $m$ states might technically have slightly different energy states. But the center of mass of the hydrogen could have some motion too. So when you try to measure the energy precisely you might not be able to tell the hydrogen moving towards... | {
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"tags": "quantum-mechanics, born-rule",
"url": null
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openni-kinect
Title: openni driver installation
I am installing openni drivers for kinect and I successfully performed a 'hg clone https://kforge.ros.org/openni/drivers'. However when I cd into drivers and try to perform a 'make' I get a "git: Command not found". What does this mean and can anyone help me out?
Ori... | {
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machine-learning, training, optimization
Past work avoids the problems you mentioned by optimizing the weights with respect to a held-out validation set. Importantly, the weights learned are for the training set, that way, you can't just set all the weights to zero because then your model wouldn't learn anything and y... | {
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"openwebmath_score": null,
"tags": "machine-learning, training, optimization",
"url": null
} |
quantum-mechanics, angular-momentum, hilbert-space, quantum-spin, orbitals
Title: Atomic Orbitals, Singlets, Triplets Why are singlet states representative of the $s$-orbitals, and similarly why are triplet states representative of $p$-orbitals? I learned about these states as resulting from having a total spin of a t... | {
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"tags": "quantum-mechanics, angular-momentum, hilbert-space, quantum-spin, orbitals",
"ur... |
optics, photons, frequency, non-linear-optics, photonics
The first problems arises when I consider the concepts of frequency chirp and of transform limited pulse. As far as I know, a transform limited pulse is the shortest pulse that can be obtained with a certain spectrum, while in chirped pulses the components at di... | {
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"tags": "optics, photons, frequency, non-linear-optics, photonics",
"url": null
} |
java, performance, android, formatting
public void checkReleaseIn(Vector2f click, int index) {
if (isClickInside(click, index)) {
release(index);
}
}
public void checkReleaseIn(Vector2f click) {
for (int i = 0; i < name.size(); i++) {
checkReleaseIn(click, i);
}
}
publ... | {
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"tags": "java, performance, android, formatting",
"url": null
} |
water, pressure
Submarines have a rigid outer shell which allows the air inside to remain at atmospheric pressure even at great depth. So as long as the poor sailors can hold their breath all the way up, then there is pretty much no risk of the bends. More likely, submarine escapees will require some compressed air so... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "water, pressure",
"url": null
} |
ros
Title: ros add third party library but compilation does not pass
I want to load third party library ，but compilation does not pass .How to solve it.
my cmakefile.txt:
ink_directories(${catkin_LIB_DIRS} lib)
add_executable( testusbcan src/testusbcan.cpp)
target_link_libraries(testusbcan ${catkin_LIBRARIES} contr... | {
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"id": 29101,
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\begin{eqnarray*} \frac{e^{-x}}{1+x} &=&\left(1-x+\frac{x^2}{2}-\frac{x^3}{6}+\cdots \right) (1- x+x^2-x^3+\cdots ) \\ &=& \cdots +x^3 \underbrace{\left( -1-1-\frac{1}{2}-\frac{1}{6}\right)}_{\color{blue}{-\frac{8}{3}}}+ \cdots \end{eqnarray*}
• Can you explain what exactly did you do? – Tanuj Sep 3 '17 at 14:12
• Wow... | {
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"tags... |
navigation, odometry, quaternion, node, subscribe
double vx = 0.1;
double vy = -0.1;
double vth = 0.1;
ros::Time current_time, last_time;
current_time = ros::Time::now();
last_time = ros::Time::now();
ros::Subscriber sub = n.subscribe<nxt_msgs::Compass>("compass", 1000, chatterCallback);
ros::Rate r(3... | {
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"tags": "navigation, odometry, quaternion, node, subscribe",
"url": null
} |
image-processing, discrete-signals, dft
Title: Scaling Property in DFT In below image, we have scaling property of DFT, how the final equation is obtained from the above equation. That is how we are getting the scaling factor , $ \frac{1}{|ab|} $ in the final equation ? Please explain how we are getting $ \frac{1}{|ab... | {
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} |
So I did ##(A+2I)\tilde v_2 = v_2## and found out the generalized eigenvector ##\tilde v_2 =\begin{bmatrix} 0 \\ -1/2 \\ 0 \\ 0 \\ -1 \\ 0 \end{bmatrix}## which according to wolfram alpha ( http://www.wolframalpha.com/input/?i=jordan+form+[{-2%2C-4%2C0%2C4%2C1%2C-1}%2C{0%2C-2%2C0%2C0%2C-1%2C1}%2C{-4%2C4%2C2%2C0%2C-2%2C... | {
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"lm_q2_score": 0.8438951084436077,
"openwebmath_perplexity": 391.4300679072792,
"openwebmath_score": 0.9955664277076721,
"tags... |
electrostatics, electric-fields, potential, potential-energy, conductors
Reason for the first lies in the fact :
$\displaystyle W_{ext} = \int \vec{F_{ext}} \cdot \vec {\mathrm {d}r} \implies W_{ext} = - Q \int \vec{E} \cdot \vec {\mathrm {d}r} $
And we can also derive a covector field $\displaystyle \mathrm {d}\phi =... | {
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"url"... |
Let $$p : A \to T = A/\approx$$ denote the quotient map. Then $$r = p \circ q : I^2 \to T$$ is a quotient map. We claim that $$r(x,y) = r(x',y') \Leftrightarrow (x,y) \sim (x',y')$$.
"$$\Leftarrow$$" We have $$q(x,0) = q(x,1)$$, hence $$r(x,0) = r(x,1)$$, and we have $$q(0,y) = e^{2\pi iy}, q(1,y) = 2e^{2\pi iy} = 2q(... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9793540728763411,
"lm_q1q2_score": 0.8139833352072464,
"lm_q2_score": 0.831143054132195,
"openwebmath_perplexity": 96.31891663768356,
"openwebmath_score": 0.9640833139419556,
"tags... |
homework-and-exercises, forces, waves
If the position of the end of the string is fixed in three dimensions, there's a symmetry argument that says you have to get a reflected pulse with the opposite displacement from the incident pulse: at the fixed point, the incident pulse and the reflected pulse must add up to give... | {
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"tags": "homework-and-exercises, forces, waves",
"url": null
} |
neuroscience, brain, neuroanatomy, imaging, visualization
This is not the case in functional connectivity analysis, or indeed not necessarily the case in any sort of functional neuroimaging analysis. The colormap highlighting in such images as you referred to (see the primary reference for that particular image) refle... | {
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"id": 10496,
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"tags": "neuroscience, brain, neuroanatomy, imaging, visualization",
"url": null
} |
python, python-3.x, homework
Use with open(...) to guarantee closing the file cleanly. | {
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"url": null
} |
python, python-3.x, web-scraping, beautifulsoup
def _get_amazon_category_names_urls(self, section: str, category_class: str, print_progress=False,
cache_contents=True, delimiter='&&&', cleanup_empty=True):
"""
Return a list of pairs [category name, url] if previo... | {
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"tags": "python, python-3.x, web-scraping, beautifulsoup",
"url": null
} |
thermodynamics, convection
$$q^{\prime\prime}_\mathrm{bottom}=-k_\mathrm{air}\left.\frac{dT}{dx}\right|_{x=0}=-k_\mathrm{wall}\frac{T(0)-T_\infty}{t};$$
$$q^{\prime\prime}_\mathrm{top}=-k_\mathrm{air}\left.\frac{dT}{dx}\right|_{x=L}=-\frac{J}{A}+k_\mathrm{wall}\frac{T(L)-T_\infty}{t};$$
with interior box height $L$; t... | {
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"openwebmath_score": null,
"tags": "thermodynamics, convection",
"url": null
} |
electromagnetism, semiconductor-physics, capacitance, electrical-engineering
Title: Capacitance per unit area and CMOS case In a modern 0.35 μm CMOS processor the gate oxide thickness is around 80 Å = 8 nm. This gives us a capacitance per unit area of $430~\mathrm{nF/cm^2}$
I am not getting how one gets this capacitan... | {
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"tags": "electromagnetism, semiconductor-physics, capacitance, electrical-engineering",
"u... |
ros
Title: Finding sphinxbase
Hello,
I am very new to ROS so please excuse me if this is a completely silly question.
I am trying to compile a package given to me by someone. I have an initialized ros_ws folder with the package in the src subdirectory. I type "catkin_make" and get the following error:
-- checking... | {
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"tags": "ros",
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ros, arduino, serial, hardware-interface
Full code of my project in the current state of using messages can be found here:
https://github.com/DeborggraeveR/ampru
the ampru_base package, contains both the firmware and the hardware interface node. | {
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"tags": "ros, arduino, serial, hardware-interface",
"url": null
} |
quantum-mechanics, hilbert-space, hamiltonian
The function $\psi(\mathbf r) = Ce^{i\mathbf p_0\cdot\mathbf r/\hbar}$ is of similar status as the "delta function" $\psi(\mathbf r) = \delta(x-x_0)\delta(y-y_0)\delta(z-z_0)$ is. They are useful as tools to ease the work with the normalizable functions, but they can never... | {
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"tags": "quantum-mechanics, hilbert-space, hamiltonian",
"url": null
} |
roslaunch, openni-launch, openni-camera
Originally posted by dornhege with karma: 31395 on 2012-11-05
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Ola Ringdahl on 2012-11-05:
That seems logical, but how can I call a shell script within a node tag, do I have to add something... | {
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"tags": "roslaunch, openni-launch, openni-camera",
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haskell, lisp, machine-learning
Title: Reinforcement learning example (chap. 1) from Sutton's book I ported the Lisp Tic Tac Toe code from Chapter 1. to Haskell. The original code repo is down for some reason.
I believe I have completely rewritten that in Haskell (Less functional than one would expect ). It is being t... | {
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"tags": "haskell, lisp, machine-learning",
"url": null
} |
c++, unit-testing, template, boost, overloading
}
output.at(x, y) = bicubicPolate(ndata, xMappingToOriginFrac, yMappingToOriginFrac);
}
}
return output;
}
// multiple standard deviations
template<class InputT>
constexpr static Image<InputT> gaussianFigure2D... | {
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ros, driver, openni-kinect
make[2]: Leaving directory `/home/vincent/drivers/ps_engine/build/ps_engine/Platform/Linux-x86/Build'
make[1]: *** [installed] Error 2
make[1]: Leaving directory `/home/vincent/drivers/ps_engine'
make: *** [ps_engine_lib] Error 2
Has someone had the same problems before?
Originally posted ... | {
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"tags": "ros, driver, openni-kinect",
"url": null
} |
context-free, formal-grammars
The proof that this grammar is unambiguous goes along the description above, though the formal proof by induction is somewhat challenging. | {
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"tags": "context-free, formal-grammars",
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} |
# Finding a partition $P'$ over an interval for which $U(f, P')-L(f,P') \lt 2$
If $f:x \to 2x+1$ over the interval $[1,3]$ and $\mathcal P$ be a partition consisting of the points $\{1,\frac32,2,3\}$, how do I find a partition $\mathcal P'$ of $[1,3]$ for which $U(f,\mathcal P')-L(f,\mathcal P') \lt 2 ?$
$U$ and $L$ d... | {
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"openwebmath_score": 0.8744290471076965,
"tag... |
php, dependency-injection, singleton, interface
{
// find a device of the given type
foreach ($this->devices as $device) {
if ($device instanceof $type) {
return $device;
}
} | {
"domain": "codereview.stackexchange",
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"openwebmath_score": null,
"tags": "php, dependency-injection, singleton, interface",
"url": null
} |
ros, audio, audio-common
In practice, if you want to do speech recognition I'd recommend the ROS pocketsphinx package. It's what most ROS users use for speech recognition, and it's reasonably well maintained. The only place where it may not work is if you want to do the audio capture and speech processing on two diffe... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, audio, audio-common",
"url": null
} |
cc.complexity-theory, np-hardness, reductions, parameterized-complexity
Title: Instance of FPT-reductions that is not a polynomial-time reduction In parametrized complexity people use fixed-parameter-tractable (FPT) reduction to prove W[t]-hardness. Theoretically a FPT-reduction is not a polynomial-time reduction, sin... | {
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"id": 563,
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"tags": "cc.complexity-theory, np-hardness, reductions, parameterized-complexity",
"url": ... |
ros-melodic, boost
RoverMoveLib.cpp
#include "rover_move/rover_move.h"
void goal_call_back(geometry_msgs::Twist goal){
// still empty
}
I have input necessary config in CMake file and I got this error:
Can anyone help me why this happened? I just want to try a simple code. Publishing and subscribng to Twist type m... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros-melodic, boost",
"url": null
} |
general-relativity, differential-geometry, metric-tensor, differentiation, notation
Title: What is the difference between $\partial_{\mu}$ and $\partial^{\mu}$? I've seen in many books both expressions $\partial_{\mu}$ and $\partial^{\mu}$, which are the covariant and contravariant partial derivatives, respectively, a... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "general-relativity, differential-geometry, metric-tensor, differentiation, notatio... |
sql, sql-server
As far as I am concerned, this function should be removed entirely, and a simple presentation-layer system should be added that simply appends a <br /> after each bond description from the query:
SELECT uC.Description
FROM Justice.dbo.uCode uC
INNER JOIN Justice.dbo.xBondCondition xBC
ON uC.Cod... | {
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"openwebmath_score": null,
"tags": "sql, sql-server",
"url": null
} |
HELLLPPP MEEEEE FREE POINTS FOR ALLL! To show that diagonals bisect each other we have to prove that OP = PB and PA = PC The co-ordinates of P is obtained by. [00:03:47] S. Login/Register to track your progress. Class 12 Class 11 … Triangle MLO is a right triangle, and MO is its hypotenuse. IF the quadrilateral is a r... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9664104904802132,
"lm_q1q2_score": 0.8543448403047531,
"lm_q2_score": 0.8840392863287585,
"openwebmath_perplexity": 1004.5608794985358,
"openwebmath_score": 0.46363794803619385,
"tags":... |
software-implementation, synchronization
The phase detection with the multiplication method is proven to be accurate and provides a stable phase control loop. It is not clear to me how you are determining your phase error so there may be issues there, and it also looks like you are adding the phase correction to the ... | {
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"tags": "software-implementation, synchronization",
"url": null
} |
c#, locking, cache
Title: Locking during cache population Here I want to lock when populating a particular cache object, without blocking other calls to the same method requesting Foos for other barIds. I realise the MemoryCache will be thread safe, but if two or more concurrent calls come in it seems like it would be... | {
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"tags": "c#, locking, cache",
"url": null
} |
atmosphere, carbon-cycle
I would say you are spot on with the complicating factors.
Local influences are important as $CO_2$ emissions have different radiocarbon signatures depending on their origin. $CO_2$ from fossil fuel burning contains no radiocarbon while the nuclear industry emits low amounts of pure $^{14}C$ ... | {
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"tags": "atmosphere, carbon-cycle",
"url": null
} |
quantum-gravity, ads-cft, holographic-principle
Title: Hilbert space of quantum gravity: bulk $\otimes$ horizon I was reading a paper dealing with the Hilbert space of quantum gravity (or more precisely what should it look like considering what we know from QM and GR) ref: http://arxiv.org/abs/1205.2675 and the author... | {
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"tags": "quantum-gravity, ads-cft, holographic-principle",
"url": null
} |
5 years, 4 months ago
This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of... | {
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"tags":... |
python, beginner, gui, number-guessing-game
Title: Number-guessing game with simple GUI This is my second program in Python. I am aware that globals are a bad idea, but that is what I have learned so far in my course.
Right now the program is doing what it's supposed to do, my only concern is that it might be too long... | {
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"openwebmath_score": null,
"tags": "python, beginner, gui, number-guessing-game",
"url": null
} |
home-experiment, experimental-chemistry
Title: How would one go about making a cheap freeze spray? I'm interested in making a liquid freeze spray, for a fun science project. My only experience with this comes in spraying inverting canned air dusters, which spray a -60F mist/liquid (liquid if you spray while the can is... | {
"domain": "chemistry.stackexchange",
"id": 618,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "home-experiment, experimental-chemistry",
"url": null
} |
visible-light, scattering, stars
Title: Sunrise/Sunset on a planet with an A-Class or B-Class Star I'm a sci-fi writer, and I have a question regarding a hypothetical planet that orbits an A-class or B-class Star.
Assuming Rayleigh Scattering occurs roughly the same way on this planet as it does on Earth, what colors ... | {
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"tags": "visible-light, scattering, stars",
"url": null
} |
python, beginner, python-2.x, excel
Create classes based on these units. For example, create a generic File class in which you define general methods such as create_file, read_from_file, write_to_file, etc. and general class variables such as filepath, file_extension, file_directory, etc. that all classes share. You c... | {
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} |
java, beginner, layout
// Create and set up the content pane.
Graph demo = new Graph();
frame.setContentPane(demo.createContentPane(i));
// The other bits and pieces that define how the JFrame will work and what it will look like.
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
... | {
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"tags": "java, beginner, layout",
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} |
wifi, urg-node, hector, network, hokuyo
Original comments
Comment by SQ on 2016-03-29:
Hi i have the exact same issue here. I tried your method but it did not help. I'm using a UST 20LX. Any help? Thanks! :)
Comment by psprox96 on 2016-03-29:
Hi there! Its been quite some time back since I did this project. However, I... | {
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} |
python, object-oriented
def summary(self):
summary = re.sub('<[^<]+?>','', self.html())[0:200]
summary = re.sub('\n',' ',summary)
return summary
def html(self):
md = markdown.Markdown()
converted_text = md.convert(self.file_text).encode('utf-8')
return converted_tex... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, object-oriented",
"url": null
} |
optics, fiber-optics
Title: What is the ratio power in core/ total power in an optical fiber? I need to plot a graph of power_core/total power in optical fiber with respect to $V$ Number: searching on the internet I got this formula:
$$\frac{P_{Core}}{P_{Total}}=1-\exp\left(-2\left(\frac{a}{w}\right)^2\right)$$
and I ... | {
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"tags": "optics, fiber-optics",
"url": null
} |
kinect, pcl, pcl-1.7, pointcloud
}
Originally posted by VahidD on ROS Answers with karma: 72 on 2013-10-23
Post score: 0
my problem is solved, my libraries wasn't match with version of my Ros.
Originally posted by VahidD with karma: 72 on 2013-10-24
This answer was ACCEPTED on the original site
Post score: 1 | {
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"tags": "kinect, pcl, pcl-1.7, pointcloud",
"url": null
} |
beginner, mysql, bash, django
#: Ensure in DB existence
#: Make array from whitespace delimited string of databases
DATABASES_LIST=(
$( mysql -u $DB_USER -p$DB_PASSWORD -h $DB_HOST -e"SHOW DATABASES" 2>/dev/null )
)
#: Perform check
if [[ " ${DATABASES_LIST[@]} " =~ " ${DB_NAME} " ]] ; then
echo "[+] db '$DB_NAME'... | {
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"tags": "beginner, mysql, bash, django",
"url": null
} |
ros, remote-roscore, ros-indigo
Originally posted by luketheduke on ROS Answers with karma: 285 on 2015-03-31
Post score: 1
Original comments
Comment by BennyRe on 2015-04-01:
Have you set ROS_IP to the IP of the interface connected to the other computer?
Comment by luketheduke on 2015-04-01:
So if bot is the comput... | {
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"tags": "ros, remote-roscore, ros-indigo",
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} |
energy, momentum
I'm less versed in the more exotic realms of physics like general relativity, quantum mechanics, and others of the like. Do we ever see a concept that we call "momentum" that can be non-zero when energy is zero, or one where momentum exists but no corresponding concept of energy exists? How about vir... | {
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If you want to choose the positive direction to be inward, towards the center, then both your force and your acceleration will be positive.
3. Aug 6, 2017
### jfnn
Thank you so much, I am going to attempt this again in the morning with that though. Much appreciated!
4. Aug 6, 2017
### rude man
method is fine, nop... | {
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"openwebmath_score": 0.6300817131996155,
"tags... |
thermodynamics, temperature, microwaves, food
However, on more than one occasion I've microwaved a stick of butter, and the inside melts first, then the outside caves in releasing a flood of butter. (It may be relevant that my microwave turntable does not turn - but since I've done it more than once, I would not expec... | {
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"tags": "thermodynamics, temperature, microwaves, food",
"url": null
} |
All groups indistinguishable (call this A)
Two groups indistinguishable, the other distinguishable (call this B)
All groups distinguishable (call this C)
Going back to the 7 possible distributions of 2s and labelling them A, B or C accordingly:
0,0,6 B
0,1,5 C
0,2,4 C
0,3,3 B
1,1,4 B
1,2,3 C
2,2,2 A
So overall we hav... | {
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"openwebmath_score": 0.7371090650558472,
"ta... |
c++, c++11, reinventing-the-wheel, queue
So I tried implementing this way:
#include <vector>
#include <initializer_list>
#include <iterator>
#include <memory>
#include <utility>
#include <unordered_set>
#include <algorithm>
#include <type_traits>
namespace std {
template <class T, class Allocator = allocator<T> > ... | {
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"tags": "c++, c++11, reinventing-the-wheel, queue",
"url": null
} |
molecular-biology, nomenclature, protein-binding, history, immunoglobin
Title: What was Protein G named after? Protein G (the bacterial antibody binding protein) is often used to pulldown antibodies, for example in chromatin immunoprecipitation (ChIP) experiments.
However, I was unable to find a site describing the h... | {
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"tags": "molecular-biology, nomenclature, protein-binding, history, immunoglobin",
"url": ... |
amateur-observing, atmospheric-effects, visible-light
Since they failed, even with binoculars, one wonders if sky conditions were less than optimal (a cirrus layer that isn't even readily visible would broaden the point of a star enough to make it invisible against the general scatter). Star visibility from the ground... | {
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} |
The equation with roots $x,y,z$ is thus $t^3 - 2t^2 + \frac12t - 4 = 0$. (This equation only has one real root, so it's just as well that the question is about complex numbers.)
Now let $\alpha = yz+x$, $\beta = zx+y$ and $\gamma = xy+z$. The next step is to find the symmetric functions $\sum\alpha$, $\sum\beta\gamma$... | {
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"openwebmath_score": 0.8931021094322205,
"t... |
c, array, c99
///
/// @brief Retrieves the element value at the front of the Dynamic Array.
/// @pre There must be at least one element in the Dynamic Array.
/// @note Precondition is not checked so that this macro can be used as a
/// modifiable lvalue.
/// @param [in] DynArray The Dynamic Array.
/// @ret... | {
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"url": null
} |
quantum-mechanics, angular-momentum, heisenberg-uncertainty-principle
One possibility: spin compositions?
The only thing I can think might be a bit of a way to generate nice intuition would perhaps be to use spin-composition rules. So for example it's well-known that given two spin-$1/2$ particles they have four spin ... | {
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"tags": "quantum-mechanics, angular-momentum, heisenberg-uncertainty-principle",
"url": n... |
discrete-signals, linear-systems, z-transform
The CCDE is given, but I was trying to derive it on my own and now I am stuck.
first of all, the reverse y[n] when goes through the delayed system, it turns to y[n-M].
then when it passes through the leaky integrator system,
$y'[n-M] = (1 - \lambda) * y[n-M] + \lambda * y'... | {
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In the math book that I am studying, the reader is asked to show that several statements are "logically equivalent"...and then in parentheses, the author says "[i.e.] any one of them implies the other".
This is where my confusion arises. At first it seems like I need to demonstrate that the truth tables are identical.... | {
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"openwebmath_score": 0.8172138333320618,
"ta... |
pressure, fluid-statics, surface-tension, capillary-action
The value of $R'$ is just trigonometry. Given the contact angle $\theta_E$ on the diagram, it's fairly easy to see that the radius of the circular interface shown on the diagram $R'$ satisfies $\cos\theta_E=\frac{1}{2}H/R'$.
The radius of curvature carries a s... | {
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"tags": "pressure, fluid-statics, surface-tension, capillary-action",
"url": null
} |
homework-and-exercises, special-relativity, spinors
Title: Pauli matrices identities There are some definitions and properties for Pauli matrices and their combinations:
$$
\varepsilon^{\alpha \beta } = \varepsilon^{\dot {\alpha} \dot {\beta} } = \begin{pmatrix} 0 & 1 \\ -1 & 0 \end{pmatrix}_{\alpha \beta }, \quad \va... | {
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"tags": "homework-and-exercises, special-relativity, spinors",
"url": null
} |
you can deduce
$not (\lim\limits_{n\to\infty}a_n=0 ) \rightarrow not (\sum\limits_{n=0}^{\infty}a_n \: converges)$
or in other words
$\lim\limits_{n\to\infty}a_n \not =0 \text{ or the limit doesn't exist} \rightarrow \sum\limits_{n=0}^{\infty}a_n \: diverges$
• Regarding the redundancy in my understanding, although... | {
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"openwebmath_score": 0.9430496096611023,
"tag... |
computational tools. Python offers an alternative way of defining a function using the lambda form. This kind of matrix inversion can become very, very tricky for complex situations. It depends on the differential equation, the initial condition and the interval. These classes are built on routines in numpy and scipy. ... | {
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"lm_q1_score": 0.9871787857334058,
"lm_q1q2_score": 0.8070921808494271,
"lm_q2_score": 0.817574478416099,
"openwebmath_perplexity": 611.0340591978346,
"openwebmath_score": 0.5929720401763916,
... |
My own take on this:
Clear[f]
f[0] = 0;
f[n_] := f[n] = If[Or[MemberQ[Last /@ Most[DownValues[f]], f[n - 1] - n],
f[n - 1] < n], f[n - 1] + n, f[n - 1] - n]
f /@ Range[0, 11]
(* {0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22} *)
We can draw the figure using
With[{list = Table[f[n], {n, 0, 30}]},
Show[Graphics@*Circle @... | {
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"lm_q1_score": 0.9591542794197472,
"lm_q1q2_score": 0.8383749206517636,
"lm_q2_score": 0.8740772351648677,
"openwebmath_perplexity": 5213.820737821472,
"openwebmath_score": 0.18212491273880005,
"ta... |
biochemistry, dna, dna-isolation
Figure 1. Agarose gel electrophoresis of DNA samples extracted from horticultural plants. M, molecular weight marker. Modified from Kasajima et al. (2013)
as well as this gel from ThermoFisher
Genomic DNA purified with the Genomic DNA Purification Kit
Agarose gel (0.7%) electrophores... | {
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"openwebmath_score": null,
"tags": "biochemistry, dna, dna-isolation",
"url": null
} |
gazebo
Title: How can i use mouse to move the robot in gazebo?
I want to make a robot, which will move like a robot in video games. i.e when i move the mouse right side, it should rotate its face to right direction according to how much mouse has rotated, and when some keys in keyboard is pressed it should move forwa... | {
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"tags": "gazebo",
"url": null
} |
c#, asp.net
The other thing is that you could use LiNQ and check for all the objects that do not meet the criteria and then perform some actions on those objects. | {
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ros, ros-melodic, gpu
Then, to install 10.0, carefully follow the instructions at https://docs.nvidia.com/cuda/archive/10.0/cuda-installation-guide-linux/index.html. Do not install the nvidia-cuda-toolkit or nvidia-cuda-dev packages from the Ubuntu repositories - these install CUDA 9.1, which is not compatible with Au... | {
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"tags": "ros, ros-melodic, gpu",
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} |
c#, tpl-dataflow
Typical usage:
fileWatcher.FileChanged += (_, fileName) => uniqueBufferBlock.Post(fileName);
// ...
while (await uniqueBufferBlock.OutputAvailable(cancelToken))
{
var fileName = uniqueBufferBlock.Receive();
await ProcessFile(fileName, cancelToken);
}
What drawbacks could we face with it and... | {
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"tags": "c#, tpl-dataflow",
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For $$\lim_{x\to5} \frac{\sin(x)}{x}$$
taking L'Hopital does not work since we are not at an indeterminate form.
Thus, $$\lim_{x\to5} \frac{\sin(x)}{x} = \frac{\sin(5)}{5}$$
Notice that in the case of $$\lim_{x\to0} \frac{\sin(x)}{x}$$
we have:
$$\frac{0}{0}$$
which is interminate, and so we apply the rule. In th... | {
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"tags"... |
frequency, nyquist
Title: nyquist fequency simple question, but I cant seem to understand how they got the answer.
I have $x(t)$ as a signal, and I'm told that its Nyquist frequency is $\omega_0$
I'm asked - what is the Nyquist frequency of this next signal: $$ x(t)\cos^2(\omega_0t)$$
after playing with it I got the ... | {
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"tags": "frequency, nyquist",
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Two Final Points
1. In the example above, we can see that the hypograph of $$g$$ is the exact same set as the sublevel set (at $$c=0$$) of the function $$h:\mathbb{R}^2\to\mathbb{R}$$ given by $$h(x_1,x_2)=x_2-x_1+1$$. In general, the hypograph of a function $$g:\mathbb{R}^n\to\mathbb{R}$$ equals the sublevel sets for... | {
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"lm_q1q2_score": 0.845462343309694,
"lm_q2_score": 0.8705972717658209,
"openwebmath_perplexity": 230.80191659266956,
"openwebmath_score": 0.9992465972900391,
... |
reinforcement-learning, deep-rl, dqn, experience-replay, bootstrapping
It is worth noting that in the DQN "rainbow" paper, the authors add n-step returns, ignoring the theory regarding truncating with an early bootstrap. They simply store the discounted sum of rewards $r_{t+1}$ to $r_{t+n}$, plus $s_{t+n}$ for e.g. n=... | {
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"openwebmath_score": null,
"tags": "reinforcement-learning, deep-rl, dqn, experience-replay, bootstrapping",
"url": null
} |
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