text stringlengths 1 1.11k | source dict |
|---|---|
c++, performance, integer
HugeInt& HugeInt::radixComplementSelf() {
if (!isZero()) {
uint64_t sum{0};
uint32_t carry{1};
for (int i = 0; i < numDigits; ++i) {
sum = static_cast<uint64_t>(twoPow32 - 1)
- static_cast<uint64_t>(digits[i])
+ ... | {
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"tags": "c++, performance, integer",
"url": null
} |
general-relativity, differential-geometry, vectors, terminology, linear-algebra
Title: Hawking & Ellis: typo on page 16? On page 16 of The Large Scale Structure of Space-Time (1973) by Hawking and Ellis, they describe the basics of tangent spaces. This line appears near the top of the page:
Thus the tangent vectors a... | {
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... |
Here is the work for these two calculations. First, using A = 47°: $$\sin(B) = \frac{b\sin(A)}{a} = \frac{12.8\sin(47)}{9.4} = 0.99588589…$$ so $$B = \arcsin(0.99588589) = 84.80°$$
Next, using A = 47.166°: $$\sin(B) = \frac{b\sin(A)}{a} = \frac{12.8\sin(47.166)}{9.4} = 0.99857231…$$ so $$B = \arcsin(0.99857231) = 86.9... | {
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"lm_q2_score": 0.8104789063814617,
"openwebmath_perplexity": 496.34388816698294,
"openwebmath_score": 0.7821502685546875,
"t... |
c#, linq, fizzbuzz
public static void Main()
{
foreach(var val in Enumerable.Range(1, 100).Select(n => FizzBuzz(n)))
Console.WriteLine(val);
}
Note, I have also undone the slow, and unnecessary conversion of the Enumerable to the ToList().ForEach() operation. Converting it to the list befo... | {
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"tags": "c#, linq, fizzbuzz",
"url": null
} |
imbalanced-datasets, multiclass-classification, k-fold-cv
First, apply the balance-restoration technique to your training data. Then parametrize a model using k-fold cross-validation on the re-balanced training data. In Scikit learn, I believe you can even bundle these actions together into a single 'pipeline' object ... | {
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"tags": "imbalanced-datasets, multiclass-classification, k-fold-cv",
"url": null
} |
triangles and circles proofs. 33(28) = 42(NO) Cross multiply. 1) 28 18 GF 98? B A C 2) 168 154 182 DC B? 33 39 N M State if the triangles in each pair are similar. Find the length y of BC' and the length x of A'A. Similar and Congruent Triangles Quiz 1. Prove that the tangents to the circumcircle at the three vertices ... | {
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"lm_q1_score": 0.9790357616286122,
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"lm_q2_score": 0.8289388083214156,
"openwebmath_perplexity": 1141.6006547980094,
"openwebmath_score": 0.520653247833252,
"tags": n... |
differential-geometry, group-theory, topology
Now, taking a step back, we can see that this is kind of like your situation. Imagine we wonder why $S^1 \times S^1$ is not the same as $S^2$. Well, you can map $S^1 \times S^1$ onto $S^2$ as follows. $S^1 \times S^1$ is a torus. Squeeze the walls of the torus in on ea... | {
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"tags": "differential-geometry, group-theory, topology",
"url": null
} |
c#, programming-challenge
while (Q.Count > 0)
{
List<Cell> tempList = new List<Cell>();
int count = Q.Count;
for (int i = 0; i < count; i++)
{
var curr = Q.Dequeue();
tempList.Add(curr);
... | {
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"tags": "c#, programming-challenge",
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} |
javascript, jquery, game, html, css
Which can be rewritten to avoid inverting the condition: (the original condition in collision_node checked if there was no collision)
function testCollision(bb1, bb2) {
return (bb1.bottom >= bb2.top && bb1.top <= bb2.bottom && bb1.right >= bb2.left && bb1.left <= bb2.right)
}
N... | {
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"tags": "javascript, jquery, game, html, css",
"url": null
} |
general-relativity, black-holes, reference-frames, observers, free-body-diagram
Title: Watching something fall into a black hole from far away I am observing (theoretically) an object falling into a black hole from a safe distance away. My understanding is that from far away it appears as if the body will asymptotical... | {
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"tags": "general-relativity, black-holes, reference-frames, observers, free-body-diagram",
... |
verilog
For debugging purposes, it is helpful to display the simulation time as well: $time.
Also for debugging, it is better to dump signals throughout the hierarchy. Currently, you just dump the testbench signals. If you call $dumpvars without arguments, you will also get the design variables dumped to your VCD fi... | {
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"tags": "verilog",
"url": null
} |
Now that we have generated a formula (a well-known one at that), we can proceed with this problem. I have proved this sum.
We know that the sum must be equal to 666, so let's plug that in and solve.
$$666=\frac{n(n+1)}{2}$$ Let's eliminate the fraction immediately by multiplying by 2 on both sides.
$$1332=n(n+1)$$ Ex... | {
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"lm_q2_score": 0.8354835289107309,
"openwebmath_perplexity": 359.881566307286,
"openwebmath_score": 0.9160807132720947,
"tags": null,... |
lambda-calculus
Title: Is (λx.FV(A)) and (λx.FV(B)) β-equivalent? Does free variables have some meaning in lambda calculus? If I follow this β-reduction
(λx.λz.y x) y
-> (λz.y x){x/y} (variable FV(y) captured)
-> ((λz.y x){a/y}){x/y} (rename FV(y) -> FV(a)){
-> (λz.a x){x/y}
-> (λz.a y)
Here we... | {
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"tags": "lambda-calculus",
"url": null
} |
c++, multithreading, queue
This is the only use volatile has in C++, it means that writes and writes to volatile memory will always happen and will happen in the order specified. For example the compiler can, and frequently does re-order stores and writes. The compiler can remove memory writes and reads if it can dete... | {
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"tags": "c++, multithreading, queue",
"url": null
} |
ros
Now, I know permissions are set somewhat correctly, because I otherwise get the "Unable to open serial port [/dev/ttyUSB0]. Permission denied." error prior to chown/chmod-ing /dev/ttyUSB0. After that, apparently the device can be opened, but can't be properly accessed.
I've got a USB version of the device ordered... | {
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"tags": "ros",
"url": null
} |
python, performance, numpy, cython
@cython.boundscheck(False)
@cython.wraparound(False)
def ericgtos(basisobject1, basisobject2, basisobject3, basisobject4):
cdef np.ndarray center1 = basisobject1.center
cdef np.ndarray exponents1 = basisobject1.exponents
cdef np.ndarray coefficients1 = ... | {
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"tags": "python, performance, numpy, cython",
"url": null
} |
zoology, taxonomy
Title: If Myxozoa is animal, so what is really animal? I read about the new discovered creature call Myxozoa and it say that Myxozoa is animal because of it possess cnidocysts like other cnidarian. But why doesn't it is a converge evolution ?
Myxozoa doesn't fit one of the most important characterist... | {
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"tags": "zoology, taxonomy",
"url": null
} |
cell-biology, dna
During the primary stages of growth, immediately following the fertilisation of the female gamete, the zygote begins to divide. Most of these initial cells will not be specialised, they will be stem cells and these have the potential to asymmeterically divide. When they do this, each of the daughter ... | {
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"tags": "cell-biology, dna",
"url": null
} |
javascript, html, audio, vue.js
onKeyDown(e) {
switch (e.keyCode) {
case 12:
this.playSound(a);
break;
case 13:
this.playSound(b);
break;
}
... | {
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"tags": "javascript, html, audio, vue.js",
"url": null
} |
ros, frontier-exploration, footprint
Originally posted by paulbovbel with karma: 4518 on 2014-11-28
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by e.mint27 on 2014-12-01:
thanks. we just added the screenshots and the gist. we hope that helps. | {
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Curve and between two Curves can do exactly the same process but itâs. The definite integral in terms of an antiderivative of its integrand is designed to the. Problem of Fundamental Theorem of calc dt, x > 0 itâs really telling you is how to the. We use both of them in ⦠What 's the intuition behind this chain a... | {
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"lm_q2_score": 0.8418256432832333,
"openwebmath_perplexity": 511.59056534953993,
"openwebmath_score": 0.9153153896331787,
... |
organic-chemistry, reaction-mechanism
Title: Is the rate of an SN1 reaction really independent of the type of nucleophile? Suppose we take two reactions
$\ce{(CH3)3CCl + H_2O \rightarrow (CH3)3COH +HCl}$
$\ce{(CH3)3CCl + CH3OH \rightarrow (CH3)3COCH3 +HCl}$
I know in $\mathrm{S_N1}$ reactions the RDS (Rate Determining... | {
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ros, python, ros-hydro, ros-fuerte, roscore
and I got the following error:
Downloading/unpacking pip
Downloading pip-1.5.6.tar.gz (938Kb): 40Kb downloaded
Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 126, in main
self.run(options, args)
File "/usr/lib... | {
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λ r hr, add_le_of_le_sub_left $h1.2$ λ y hy, le_sub.2 $h0.2$ λ x hx, le_sub_iff_add_le.2 $hr ⟨x, y, hx, hy, rfl⟩⟩ end hidden #### Kenny Lau (Aug 08 2020 at 06:35): @Kevin Buzzard deja vu? #### Patrick Thomas (Aug 08 2020 at 07:19): Do you know why I get type mismatch at application for the exists.elim s2? #### Kenny La... | {
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"lm_q1q2_score": 0.8306465399943904,
"lm_q2_score": 0.8577681086260461,
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"openwebmath_score": 0.3846169710159302,
"tags": ... |
atomic-physics, schroedinger-equation, quantum-chemistry
Such a configuration seems asymmetric, but that's not necessarily a problem. Even if we expect the true ground state to have some special symmetry, the optimal Slater determinant does not necessarily need to have that same symmetry. It only needs to belong to a ... | {
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"tags": "atomic-physics, schroedinger-equation, quantum-chemistry",
"url": null
} |
gravity, cosmology, universe, space-expansion, dark-energy
Until recently we expected that this slowing would continue and almost but not quite bring the expansion to a complete stop. However we have since discovered dark energy, which has the opposite effect to matter and causes the expansion to speed up not slow dow... | {
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"tags": "gravity, cosmology, universe, space-expansion, dark-energy",
"url": null
} |
gazebo
I obtain
name: ['ground_plane::link', 'labrob::base_footprint', 'labrob::back_left_wheel', 'labrob::back_right_wheel', 'labrob::front_left_wheel', 'labrob::front_right_wheel', 'labrob::medium_left_wheel', 'labrob::medium_right_wheel']
pose:
-
position:
x: 0.0
y: 0.0
z: 0.0
orienta... | {
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"tags": "gazebo",
"url": null
} |
fluid-dynamics
Title: Why jets entrain mass?
This very beautiful picture shows a jet of fuel in the combustion chamber of a diesel engine. Does anydody could explain me what is the physical reason that the jet entrains air? Why jets and plumes entrain mass from the environment?
Edit. I believe it has to do with the ... | {
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beginner, comparative-review, swift, ios, core-data
/*
Typical reasons for an error here include:
* The parent directory does not exist, cannot be created, or disallows writing.
* The persistent store is not accessible, due to permissions or data protection when the device is loc... | {
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"tags": "beginner, comparative-review, swift, ios, core-data",
"url": null
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fluid-dynamics, computational-physics, history, navier-stokes
$${\partial v_x\over\partial t} + \mathbf v\cdot\nabla v_x - \nu \nabla^2 v_x = - \frac{\partial \lambda}{\partial x} + a_x,$$ and then we can extend the above analysis to the directions $y,z$ too to find,
$$\dot{\mathbf v} + (\mathbf v\cdot\nabla)\mathbf v... | {
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"tags": "fluid-dynamics, computational-physics, history, navier-stokes",
"url": null
} |
x-rays
Title: How do I differentiate $K_\alpha$ from $L_\alpha$ transitions of X-ray emissions? If I shine an electron beam in a sample and it returns, for an example, an X-ray wavelength compatible with both $K_\alpha$ of copper and $L_\alpha$ of hafnium. How can I tell the difference between these elements?
Edit: Us... | {
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"tags": "x-rays",
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electromagnetism, magnetic-fields, electric-circuits, electric-fields, electromagnetic-induction
If for simplicity we take the cross-sectional areas of the windings to be the same, then the constancy of the magnetic flux implies that $I_p N_p = - I_s N_s$. For a step-up transformer, $N_s > N_p$, and so $I_s$ is reduce... | {
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"tags": "electromagnetism, magnetic-fields, electric-circuits, electric-fields, electromagn... |
$a = 4$
$a = 2 c \implies c = \frac{a}{2} \therefore c = 2$
${b}^{2} = 3 {c}^{2} \implies {b}^{2} = 3 \cdot 4 = 12 \therefore b = \sqrt{12} = 2 \sqrt{3}$
Putting all of this together, and using the horizontal ellipse equation, gives us:
${\left(x - 0\right)}^{2} / {\left(4\right)}^{2} + {\left(y - 4\right)}^{2} / {... | {
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"openwebmath_score": 0.9191396832466125,
"tags": nu... |
ros, dependencies
Originally posted by JrManit on ROS Answers with karma: 1 on 2011-10-21
Post score: 0
Original comments
Comment by tfoote on 2011-10-22:
Please provide more information about what architecture and OS you are running.
What OS and repo are you using? Please quote your sources.lists and show the conso... | {
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24 May 2010, 22:35
Ok so if 5 people are to sit at a round table how many ways can they be seated. Why is the answer not 5!
Manager
Joined: 20 Apr 2010
Posts: 153
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Show Tags
25 May 2010, 00:07
Total No. of ways in which n no. of persons could be arranged o... | {
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"lm_q1q2_score": 0.8695319218988772,
"lm_q2_score": 0.9149009642742805,
"openwebmath_perplexity": 3373.8421979203454,
"openwebmath_score": 0.5322432518005371,
"tags": ... |
organic-chemistry, experimental-chemistry, equipment, minerals
(image credit to https://schlenklinesurvivalguide.com/)
The principal advantage is that you evacuate the reaction flasks (round bottom flasks, but not Erlenmeyer flasks) and thus effectively replace the atmosphere in these containers by a dry inert gas e.g... | {
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"tags": "organic-chemistry, experimental-chemistry, equipment, minerals",
"url": null
} |
electromagnetism, electric-fields, potential, dipole, dipole-moment
Title: Why is dipole potential independent of azimuthal angle? In the formula for dipole potential in spherical coordinates, there is no dependence on azimuthal angle. I don't see why this is as by varying the azimuthal angle, i.e changing our positio... | {
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"tags": "electromagnetism, electric-fields, potential, dipole, dipole-moment",
"url": nul... |
waves and sine waves are basically the same shape, we’ll focus on sine waves, but all the concepts in this worksheet apply to both. y = cos 2x − 5 6. w Graphs of Sine and Cosine: Part 1 Graph each function using radians. Timbre--- that character of the note that enables us. Graphs of the Sine and Cosine Functions (Obj.... | {
"domain": "cigibuilding.it",
"id": null,
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"lm_q2_score": 0.8152324960856175,
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"openwebmath_score": 0.6676138639450073,
"tags... |
c++, parsing, console, boost
// Xterm Sequences Not implemented, pass through
case ' ':
//ESC SP F 7-bit controls (S7C1T).
//ESC SP G 8-bit controls (S8C1T).
//ESC SP L Set ANSI conformance level 1 (dpANS X3.134.1).
//ESC SP M Set ANSI conformance level 2 (dpANS ... | {
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• I think it's at least order $n^2$ since that is the amount of time it takes for the 1st car to move even one step – zoidberg Dec 9 '18 at 23:10
• See how long it takes for car at $n-1$ to get to its destination and then for car at $n-2$ and see if there is a pattern. – herb steinberg Dec 9 '18 at 23:11
• @norfair: no... | {
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human-biology, prion, human-physiology
Title: How can ingesting a prion "infect" someone? That's something that's been bugging me for a while...
Our gastrointestinal tract produces proteases that degrade proteins. Prions are proteins. Shouldn't they be broken by proteases?
Also, how can a prion pass the gastrointestin... | {
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"tags": "human-biology, prion, human-physiology",
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mechanical-engineering, design
Bottom = min 208 max 215
Top = max 211 min 209
If you take the worst case scenarios, which is the min - max you get 6mm at one end of the tolerances and and 3mm at the other between the 2 holecentres, so the holes can be as much as 6mm offset.
So with 6mm variation on a 6mm hole, i th... | {
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"tags": "mechanical-engineering, design",
"url": null
} |
This is where the paper uses number theory.
It can be shown that, in the case when $$2n + 1 = 3^k$$, the elements at positions $$1$$, $$3, 3^2, \dots, 3^{k-1}$$ are in different cycles and every cycle contains an element at the position $$3^m, m \ge 0$$.
This uses the fact that $$2$$ is a generator of $$(\mathbb{Z}/3... | {
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"tags... |
beginner, statistics, r, data-visualization
plot_prior_post_comparison <- function(
observations,
grid, shapes, rates, colors,
lwd = 2,
...) {
# make a grid for ... | {
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"tags": "beginner, statistics, r, data-visualization",
"url": null
} |
complexity-theory
Title: What will be the Turing machine to show that the function $T(n) = n$ is time constructible? Specifically, we need a Turing machine that on input $1^n$ outputs binary representation of $n$ on output tape in $O(n)$ time. I am not able to get any thing better than trivial $O(n \log n)$ time. Any ... | {
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"tags": "complexity-theory",
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} |
html, html5
Spacing
HTML is easier to read if you make the indentations 2 spaces instead of 4, this helps make it less "accordion" or "arrow" looking, and more compact with less need to scroll from left to right while editing it. Compare:
4 spaces
<body>
<div>
<header>
<h1>NS</h1>
<... | {
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"tags": "html, html5",
"url": null
} |
c#, regex, url
var schemePattern = MakeSchemePattern(scheme);
var hostPattern = MakeHostPattern(host);
var pathPattern = MakePathPattern(path);
SchemeMatch = new Regex(schemePattern, RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
HostMatch = new Regex... | {
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"tags": "c#, regex, url",
"url": null
} |
newtonian-mechanics, rotational-dynamics, energy-conservation, moment-of-inertia
Title: Kinetic Energy of a Body about Instantaneous Axis of Rotation When we write the expression for the kinetic Energy of a rotating body, we write is as
$$E = \frac{I_{\text{CM}}{\omega}^2}{2} + \frac{M{V_{\text{CM}}}^2}{2}$$
So, basic... | {
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"tags": "newtonian-mechanics, rotational-dynamics, energy-conservation, moment-of-inertia",... |
equilibrium, enzyme-kinetics
[OP] I based the kinetics for these reactions on Michaelis-Menten kinetics, so every enzyme has a $V_{max}$ and $K_M$, and has velocity $v=V_{max}x /(K_M+x)$
The product $P$ has a maximum rate of $r_\mathrm{P,max}$, not the enzyme. This value is obtained when the substrate is so abundant ... | {
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"tags": "equilibrium, enzyme-kinetics",
"url": null
} |
python, object-oriented, mathematics
isConstTerm = (term == len(coeffs) - 1)
isUnitary = (abs(c) == 1) # checks if c = 1 or -1
coeff = '' if (isUnitary and not isConstTerm) else abs(c)
if c > 0:
formatted = f' + {coeff:.03}'
elif c < 0:
formatted = f' - {coeff:.03}'
else:
... | {
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"url": null
} |
python, exception
def __str__(self, *args, **kwargs):
return self.email_obj.__str__()
def _is_email(self, possible_email_obj):
is_email = False
if isinstance(possible_email_obj, basestring):
is_email = False
# I struggled a lot with this part - however, I came to the ... | {
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That is answer. Note that it is a fixed number given $$n$$. That is, there is no distinction of best-case, worse-case or average-case.
Or is it? If we ignore over many important details, yes. However, let us take a close look. Does for i:=1 to n do involve assignment only? Mostly like not. We have to produce 1, 2, 3, ... | {
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"openwebmath_score": 0.7031508088111877,
"tag... |
electromagnetism, electric-current, charge
For example, if you want to average the current of this point charge over time, you can select a region of space of length $d_s$ that you care about. If we average over just the time that the charge is in the space, then $I = Q \cdot v / d_s = Q / t_s$, where $t_s$ is the jus... | {
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"tags": "electromagnetism, electric-current, charge",
"url": null
} |
If you do elementary row operations on this matrix until the left $3\times3$ part of it is an identity matrix, then the right $3\times 3$ part will be the inverse of the initial left $3\times 3$ part.
So $$-a\cdot\text{2nd row} + d\cdot\text{1st row} \mapsto \text{new 2nd row};$$ $$-a\cdot\text{3rd row} + g\cdot\text{... | {
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"lm_q2_score": 0.8244619285331332,
"openwebmath_perplexity": 267.73031591753687,
"openwebmath_score": 0.8821556568145752,
"ta... |
friction, harmonic-oscillator, differential-equations
Title: Hyperbolic, parabolic, elliptical PDE related to under-, critical- and overdamped in harmonic osciallation A damped harmonic oscillator has three cases for the damping: underdamped, critically damped and overdamped. With partial differential equations, I kno... | {
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"tags": "friction, harmonic-oscillator, differential-equations",
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} |
cell-biology, cancer, homeostasis
EDIT:
On checking the clinical trial registry, on first glance it looks like some safety and tolerability studies have been completed, but it would take a fair amount to do a full analysis of what has been done and what hasn't. Maybe someone else wants to do it and include it in an an... | {
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"tags": "cell-biology, cancer, homeostasis",
"url": null
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EH �-��c�@�����A�?������ ����=,�gA�3�%��\�������o/����౼B��ALZ8X��p�7B�&&���Y�¸�*�@o�Zh� XW���m�hp�Vê@*�zo#T���|A�t��1�s��&3Q拪=}L��$˧ ���&��F��)��p3i4� �Т)|��q���nӊ7��Ob�$5�J��wkY�m�s�sJx6'��;!����� Ly��&���Lǔ�k'F�L�R �� -t��Z�m)���F�+0�+˺���Q#�N\��n-1O� e̟%6s���.fx�6Z�ɄE��L���@�I���֤�8��ԣT�&^?4ր+�k.��$*��P{nl�j�@W;Jb... | {
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"lm_q2_score": 0.8774767762675405,
"openwebmath_perplexity": 668.7707819299859,
"openwebmath_score": 0.8892807364463806,
"tags": null... |
c++, array, collections, c++14
//
// Constructors / assignment:
//
constexpr array_iterator_base() noexcept
: m_parent_array{ nullptr }
, m_current_index{ 0 }
{ }
constexpr array_iterator_base(parent_type * parent, const difference_type index) noexcept
: m_parent_array{ pa... | {
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Now, for the equivalent epigraph representation of the original problem in standard form, we use the corresponding constraint in inequality form, we have: $$\min ~~t \\ \text{s.t.} ~~ f_0(\mathbf{x}) - t\leq 0 \\ \qquad f_i(\mathbf{x}) \leq 0, i=1,...,m \\~~~~~~~ h_j(\mathbf{x}) = 0, j=1,...,p.$$ Assume the original pr... | {
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"lm_q2_score": 0.8354835452961425,
"openwebmath_perplexity": 365.68024004140636,
"openwebmath_score": 0.8561255931854248,
"ta... |
gravity, pressure, neutron-stars
Title: What is the pressure at the center of the Earth? (Or a neutron star) The center of the Earth has microgravity and is thought to be solid and almost 6000 degrees hot. What is the pressure like there? The confusing thing, for the common man I suppose, is that there's no gravity th... | {
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"tags": "gravity, pressure, neutron-stars",
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ros, package
Originally posted by QAston on ROS Answers with karma: 3 on 2016-03-07
Post score: 0
It depends what a robot-specific package is for you. If that is just the packages necessary for running a specific type of robot, go ahead and release them as .deb. Everyone can use these.
If they are just for one specif... | {
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quantum-mechanics, homework-and-exercises, angular-momentum, wavefunction, hilbert-space
for the $n$'th harmonic. The specific form of the wavefunction is not important, but you can look them up on wikipedia here. What is important is that any state of the system can be written as
$$ \psi = \sum \limits_i c_i \psi_i(... | {
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statistics, matlab, vectorization
Can I vectorize the search through the t vector?
Right now I have a for loop that goes through every value of tand computes the empirical distribution function in that way. It seems that there might be a way to vectorize this operation further and get rid of the for loop. Haven't fig... | {
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pcr, statistics, quantitative-genetics
All publications / software tools etc will compute an average of 8x more B. And I am aware this originated from a log2 scale, however why does this statistically correct method differ in outcome from absolute numbers?
Update
I oversimplified my question therefore below some more ... | {
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urdf, ros-fuerte
Comment by MartinW on 2013-01-24:
Ahh, okay! So I've got the fake joint state publisher to open with my robot, but when I take that part out and try to use the robot drivers I don't get the transformation. Here is my launch file http://i.imgur.com/poxM6eS.png, "H20_player" publishes the encoder data. ... | {
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acoustics
But when you knock on a solid wall, the empty space on the other side may be an entire roomful of emptiness, which tends to dissipate rather than to concentrate sound, and the wall itself has minimal vibrational properties because it is thicker and has more mass per square inch of surface area than the surfa... | {
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"tags": "acoustics",
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c++, memory-management, homework, c++17
Can just be written as:
bool checkRemoval = pool.bitsInPool == 0;
But then the whole call to remove_if can be simplified to:
linkedList.remove_if([](Pool& pool){ return pool.bitsInPool == 0; });
Note that you don't needed to capture anything in the lambda here, so use [] inste... | {
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"tags": "c++, memory-management, homework, c++17",
"url": null
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automata, finite-automata, pushdown-automata, simulation
Title: Can every DFA be simulated by a PDA? Given a Deterministic Finite Automata (DFA) $M_1$, does there always exist a Pushdown Automata (PDA) $M_2$ that accepts the same language as $M_1$? I.e. can any DFA be simulated by a PDA? Intuitively, it makes sense ... | {
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Now all 2s are accounted for. Just add them 5 + 2 + 1 = 8 (Hence Step 4)
These are the number of 2s in 10!.
Similarly, you can find maximum power of any prime number in any factorial.
If the question says 4^m, then just find the number of 2s and half it.
If the question says 6^m, then find the number of 3s and that wil... | {
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"tag... |
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Kudos [?]: 255 [0], given: 11
Re: Three grades of milk are 1 percent, 2 percent and 3 percent [#permalink] 28 Sep 2012, 02:10
1%x + 2%y + 3%z = 1.5% (x+y+z)
2%y - 1.5%y + 3%... | {
"domain": "gmatclub.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 1,
"lm_q1q2_score": 0.8418256432832333,
"lm_q2_score": 0.8418256432832333,
"openwebmath_perplexity": 11091.30434613343,
"openwebmath_score": 0.5872703194618225,
"tags": null,
"url":... |
c#, asynchronous
According to Framework Design Guidelines about naming of types, the name of a type parameter should start with a T, here, that would be TReportedObject.
Also, I think that specifying that it's an object is redundant, so something like TReported should be enough.
public ReportedObject Content { get; p... | {
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"openwebmath_score": null,
"tags": "c#, asynchronous",
"url": null
} |
# Inner Product vs. Integrals with Fourier Series, When to include 1/2pi?
I am confused about when to include a prefactor of $\frac{1}{2\pi}$ when dealing with integrals of functions that are expressed as fourier series. This is what I understand (please correct me if I'm wrong). Assume I have a square integrable func... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.977022632097108,
"lm_q1q2_score": 0.8284836949775761,
"lm_q2_score": 0.8479677622198947,
"openwebmath_perplexity": 170.71484612931366,
"openwebmath_score": 0.9668805003166199,
"tag... |
biochemistry, homework, virology, rna, coronavirus
Title: VPg priming of the replication of RNA viruses I'm doing a presentation on the replication of SARS-CoV-2 for my chemistry class, and I found that to replicate its RNA, the virus uses RNA-dependent RNA polymerase, which is primed by a VPg primer. Since the presen... | {
"domain": "biology.stackexchange",
"id": 10639,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "biochemistry, homework, virology, rna, coronavirus",
"url": null
} |
javascript, php, html, security, sql-injection
//2---ADD INPUT TO DATABASE---
date_default_timezone_set('America/Los_Angeles'); //set timezone
$datetime = date('Ymd-Hi', strtotime('NOW')); //date and time variable
$userIP4 = $_SERVER['REMOTE_ADDR']; //ipv4 address variable
if($_SERVER['REQUEST_METHOD'] == 'POST') {... | {
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, php, html, security, sql-injection",
"url": null
} |
c#, hash-map
Maybe a try/catch block - but this seems less readable. The advantage is that if I ever do decide to log the problem I have a place to do it.
public void AddToDictionaryTryCatch(Dictionary<int, string> myDictionary, int myKey, string myValue)
{
try
{
myDictionary.Add(myKey, myValue);
... | {
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"id": 42816,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, hash-map",
"url": null
} |
ros, parameter
Original comments
Comment by Victor Lopez on 2011-05-03:
I'll have a look at it, but it is marked as unstable so I'm not sure it is resilient enough for what I need.
Comment by Victor Lopez on 2011-05-03:
I'll have a look at it, but it is marked as unstable so I'm not sure it is resilient enough for wha... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, parameter",
"url": null
} |
javascript, parsing, node.js, template, modules
}
if (state.current(/[a-z\d\.\, ]/i)) {
return state.fetch();
}
if (state.current('\\')) {
state.move();
if (state.end() || state.current(/[a-z\d]/i)) {
return '\\';
... | {
"domain": "codereview.stackexchange",
"id": 6446,
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"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, parsing, node.js, template, modules",
"url": null
} |
go
func newRunLength() *runLength {
return &runLength{
enc: func(input string) string {
var result strings.Builder
for len(input) > 0 {
firstLetter := input[0]
inputLength := len(input)
input = strings.TrimLeft(input, string(firstLette... | {
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"id": 37639,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "go",
"url": null
} |
beginner, object-oriented, multithreading, vba, asynchronous
In the comments you asked about hungarian notations. My personal preference is to not use hungarian notation for objects, so I wouldn't have used cls prefix. The concerns about namespace is not going to be helped by whether you prefix or not, mainly because ... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, object-oriented, multithreading, vba, asynchronous",
"url": null
} |
python, beginner, algorithm, matrix, mathematics
[[16, 14, 7, 30, 23],
[24, 17, 10, 8, 31],
[32, 25, 18, 11, 4],
[5, 28, 26, 19, 12],
[13, 6, 29, 22, 20]],
[[1, 14, 4, 15],
[8, 11, 5, 10],
[13, 2, 16, 3],
[12, 7, 9, 6]],
[[8, 1, 6],
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, algorithm, matrix, mathematics",
"url": null
} |
special-relativity, electromagnetic-radiation, visible-light, speed-of-light
Relativistically, the only thing that is invalid in all the above is this simple summation of speeds. You need the formula I used in the main text of this post, which reduces to the simple summation if both $u$ and $v$ are much smaller than $... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity, electromagnetic-radiation, visible-light, speed-of-light",
"u... |
Coordinates Triple integrals in cylindrical coordinates are then evaluated as iterated An Example We nd the If W is the cube, the mass is the triple integral W kz dV = ∫ 0 4 ∫ 0 ∫ 0 4kz dx dy dz = ∫4 0 ∫ 0 4 dy dz = ∫ 0 4 ∫ 0 44kz dy dz = ∫ 0 4 dz = ∫ 0 416kzdz = = 128k If distance is in cm and k = 1 gram per cubic cm ... | {
"domain": "e3p-ltd.org",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713878802044,
"lm_q1q2_score": 0.8294267257756476,
"lm_q2_score": 0.8418256492357359,
"openwebmath_perplexity": 833.9997947007021,
"openwebmath_score": 0.8829783201217651,
"tags"... |
matlab, discrete-signals, signal-analysis, signal-detection
$$
Unfortunately, this measure is affected by the number of points that I take for each curve. So for example if the resolution is half, SRSS will decrease even if I'm comparing the same lines.
Is there any other measures of asymmetry that you can suggest? Id... | {
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"tags": "matlab, discrete-signals, signal-analysis, signal-detection",
"url": null
} |
ubuntu-trusty, ubuntu
Title: Applying generated velodyne calibration file(yaml) on Ubuntu 14.04 with ROS-INDIGO
Hello, I am using 64E_S2 for a year.
I used two commands to get 3d point-clouds from the Lidar throughout ROS.
The two commands are (1) rosrun velodyne_driver velodyne_node _model:=64E_S2 _rpm:=0600 and (2)... | {
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"tags": "ubuntu-trusty, ubuntu",
"url": null
} |
ros, installation, irobot-create-2-1
No Makefile in package rostime
[rosmake-1] Starting >>> roscpp_traits [ make ]
[rosmake-1] Finished <<< roscpp_traits ROS_NOBUILD in package roscpp_traits
No Makefile in package ros... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, installation, irobot-create-2-1",
"url": null
} |
robotic-arm, turtlebot
UPDATE2
Here's the example of the previous link:
<turtlebot_arm parent="plate_top_link" color="White" gripper_color="Black"
pincher_gripper="false" turtlebot_gripper="true">
<origin xyz="0.10914 0.0295 0.0284"/>
</turtlebot_arm> | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "robotic-arm, turtlebot",
"url": null
} |
signal-power, signal-energy, dirac-delta-impulse
Soon after the introduction of his own theory, L. Schwartz published a
paper in which he showed an impossibility result (see [Sch54]) about
the product of two arbitrary distributions.
One result is Schwartz impossibility result. It (somehow) says that if one wants... | {
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"tags": "signal-power, signal-energy, dirac-delta-impulse",
"url": null
} |
php, laravel
// With properties
$color = 'success';
$theme = getTheme('component', 'componentA', [$color]);
// With multiple properties
$color = 'success';
$background = 'dark';
$theme = getTheme('component', 'componentA', [$color, $background]);
Assistance is much appreciated.
Edited:
1st Attempt:
Toby's comment ga... | {
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"tags": "php, laravel",
"url": null
} |
$\notag A = \left[\begin{array}{ccc} 0 & 1 & 0\\ 0 & 0 & 1\\ 1 & 0 & 0\\ \end{array} \right]$
has principal square root
$\notag A^{1/2} = \frac{1}{3} \left[\begin{array}{rrr} 2 & 2 & -1 \\ -1 & 2 & 2 \\ 2 & -1 & 2 \end{array} \right],$
but $A^{1/2}$ is not stochastic because of the negative elements. The square root... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9871787827157819,
"lm_q1q2_score": 0.8138913230048442,
"lm_q2_score": 0.824461928533133,
"openwebmath_perplexity": 232.0640899068836,
"openwebmath_score": 0.9777094125747681,
"tags": nul... |
javascript, cryptography, hash-map
Rewrite
I started from scratch and used typed arrays and a few other methods to speed things up. The rewrite will create a hash in about 1/15th the time and uses a lot less memory.
Rather than use the class syntax to create the tools (which is not secure) I have encapsulated the tool... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, cryptography, hash-map",
"url": null
} |
Separating the Pieces of a Rubiks Cube
I recall coming across this problem in one of my classes senior year of high school. (We only did the first part).
Easy (and probably somewhere on the internet)
Taking a standard 3x3x3 Rubik's Cube, what is the minimum number of cuts needed to separate every piece, from all oth... | {
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"lm_q1q2_score": 0.8041435079657026,
"lm_q2_score": 0.822189123986562,
"openwebmath_perplexity": 644.8536524827205,
"openwebmath_score": 0.5691950917243958,
"tags... |
matlab, audio, convolution, finite-impulse-response
Finally, regarding your expectation that the cut-off frequency of the cascaded system is $\pi/4$, note that the frequency response of the cascaded system is simply the multiplication of the two individual frequency responses, so the cut-off frequency does not change ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "matlab, audio, convolution, finite-impulse-response",
"url": null
} |
homework-and-exercises, electric-circuits, electric-current, electrical-resistance, voltage
400 feet of 24 Gauge copper wire has a resistance of 10 ohms. If you run 1 ampere of current through it then the 400 feet of 24 Gauge copper wire has a resistance of 10 ohms. If you run 2 amperes of current through it then the ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electric-circuits, electric-current, electrical-resistance... |
wavefunction, schroedinger-equation, hamiltonian, quantum-chemistry, identical-particles
So I have to ask: Is there a way to construct a many-body Hamiltonian for the SE that will guarantee a ground-state anti-symmetric wavefunction?
Is there a way to construct a many-body Hamiltonian for the SE that will guarantee a... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "wavefunction, schroedinger-equation, hamiltonian, quantum-chemistry, identical-par... |
java, swing, simulation, gui, awt
public boolean windowContainsPoint(final int x, final int y) {
return this.x <= x
&& x < this.x + width
&& this.y <= y
&& y < this.y + height;
}
public boolean topBorderContainsPoint(final int x, final int y) {
return this.x <= x && x < th... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, swing, simulation, gui, awt",
"url": null
} |
experimental-physics, error-analysis
$$ \tau = \frac{8 \pm 1}{10} = \frac{8}{10} \pm \frac {1}{10} $$
So it is $\tau = 0.8 \pm 0.1$ seconds.
If your professor says that: | {
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"tags": "experimental-physics, error-analysis",
"url": null
} |
What are the Pros and Cons of KNN metric is minkowski and. P=2, it becomes Euclidean distance What are the Pros and Cons of KNN metric as a of... It becomes Manhattan distance and when p=2, it becomes Manhattan distance when... Default 'minkowski ' the distance metric to use for the minkowski distance knn better that m... | {
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"lm_q1_score": 0.9811668701095654,
"lm_q1q2_score": 0.8280019145481794,
"lm_q2_score": 0.8438951005915208,
"openwebmath_perplexity": 851.6311919212238,
"openwebmath_score": 0.8319950103759766,
"t... |
catkin-make
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~ traversing 1 packages in topological order:
-- ~~ - biosentry_crowd_detection
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'biosentry_crowd_detection'
-- ==> add_subdirectory(BioSentry)
-- Using these mes... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "catkin-make",
"url": null
} |
fluid-dynamics
and you look at the red line indicating temperature, you can see that it decreases up to about 11km. As that happens, the water condenses and may form the first layer of clouds. The remaining air may still have some water vapor in it, but it will be below 100% relative humidity.
Above this, for the nex... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fluid-dynamics",
"url": null
} |
black-holes
You'll never actually see the probe reach the event horizon; time on the probe, as seen from an outside vantage point, will come arbitrarily close to the moment it reaches it, but it will never actually get there.
The same thing happens to any matter falling into a black hole. It will quickly reach a poi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "black-holes",
"url": null
} |
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