text stringlengths 1 1.11k | source dict |
|---|---|
ros, navsat-transform-node, navsat-transform
This code returns a nan covariance and the transform doesn't work.
Imu data, gps data and odometry data are ok. Frames are correctly choose, then where is the problem?
Bag file : https://drive.google.com/open?id=0B_1fqLQnQO6obUg0Y3BfekZOdTQ
Message screenshot : https://driv... | {
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"openwebmath_score": null,
"tags": "ros, navsat-transform-node, navsat-transform",
"url": null
} |
python, genomics, public-dataset
Title: How to access yeast-cyc in a programmatic way to extract the GO terms? I am a newbie in Bioinformatics, I want to extract the GO terms from yeast-cyc,
which is items in the Go terms tab of this page https://yeast.biocyc.org/gene?orgid=YEAST&id=G3O-29622#tab=GO , not one page but... | {
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"openwebmath_score": null,
"tags": "python, genomics, public-dataset",
"url": null
} |
python, python-2.x, dice, ascii-art
Further improvements
Having to input twice the number of faces for both print_dice_rolls and dice_rolls might be improve using a try .. except in print_dice_rolls to account for numeric values in rolls instead of a sequence of rolls. Meaning print_dice_rolls(6, 12) would be equival... | {
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"openwebmath_score": null,
"tags": "python, python-2.x, dice, ascii-art",
"url": null
} |
algorithm-analysis, runtime-analysis, knapsack-problems
def __repr__(self):
return "Item(weight={}, value={})".format(self.weight, self.value)
def knapsack(capacity):
if capacity==0: return ([], 0)
max_value = 0
max_contents = []
for item in items:
if item.weight <= capacity:
... | {
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"tags": "algorithm-analysis, runtime-analysis, knapsack-problems",
"url": null
} |
c++, c++11, linked-list
Title: simple forward_list // NODE implementation
template <typename T>
class forward_list_node{
public:
using value_type = T;
using pointer_type = T*;
using reference_type = T&;
forward_list_node(value_type value = 0) : data(value), next(nullptr) {
}
forward_list_no... | {
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"openwebmath_score": null,
"tags": "c++, c++11, linked-list",
"url": null
} |
gazebo-camera
Title: Gazebo camera plugin rendering meshes in wrong order
Trying to load a URDF model in Gazebo, and everything looks good in the Gazebo window. The model includes a Kinect , and when I look at the camera output, it renders the (.STL) meshes in the wrong order. See images here.
I've tried Gazebo 4 and... | {
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"tags": "gazebo-camera",
"url": null
} |
ruby, validation, ruby-on-rails
validates :cogs_photo_toning,
presence: {
if: -> { content_type == ContentType::Print && cogs_photo_toning_dollar.blank? },
message: 'cant be empty or provide COGS Actual Cost matching entry',
}
def content_type=(value)
new_type = ContentType.find(value)
s... | {
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"id": 36333,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ruby, validation, ruby-on-rails",
"url": null
} |
c++, c++11, tree, binary-search
if(node->data < tmp->data)
tmp->leftChild = node;
else tmp->rightChild = node;
node->parent = tmp;
}
}
void insertValue(T&& value)
{
Node* node = new Node(std::move(value));
Node* tmp;
node->leftChild = nullptr;
node->rightChild = nullptr;... | {
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"openwebmath_score": null,
"tags": "c++, c++11, tree, binary-search",
"url": null
} |
c#, performance, concurrency, task-parallel-library
_isTestInProgress = true;
try
{
InitializeBenchmark();
Task.WaitAll(CreateBenchmarkTasks());
}
finally
{
_isTestInProgress = false;
}
}
Now that we're fully using a class we can use instance members instead of local v... | {
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"openwebmath_score": null,
"tags": "c#, performance, concurrency, task-parallel-library",
"url": null
} |
c, recursion, static
res = n;
for (int j=2; j<10; j+=2)
{
res = rem(res, j);
// reset
i=0;
}
printf("%u without even numbers: %u\n", n, res);
return 0;
}
It works but I've read a lot about how a global static variable is not a good solution, so I was thinking if there is ... | {
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"openwebmath_score": null,
"tags": "c, recursion, static",
"url": null
} |
finite-automata, pumping-lemma, check-my-answer
Title: $ADD = {x=y+z}$ with $x, y, z$ binary integers, and $x$ is the sum of $y$ and $z$. Pumping lemma to show that $ADD$ is not regular Consider the alphabet $\Sigma = \{0, 1, +, =\}$ and the language $ADD = \{x=y+z|x,y$ are binary integers $x$ is the sum of $y$ and $z... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "finite-automata, pumping-lemma, check-my-answer",
"url": null
} |
c++, object-oriented, playing-cards
card.h
#pragma once
#include <string>
#include <array>
#include <vector>
#include <map>
namespace UNO
{
const std::array<std::string, 4> COMMON_COLORS =
{"BLUE", "GREEN", "RED", "YELLOW"};
const std::array<std::string, 1> SPECIAL_COLORS =
{"BLACK"};
co... | {
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"tags": "c++, object-oriented, playing-cards",
"url": null
} |
# Difference between f(1.0e-7) & f(1.0e-8)
the limit of the following function at 0 is 1,
yet f(1.0e-8) gives 0 while f(1.0e-7) gives the correct answer, why?
julia> f(x)=2*(1-x*exp(-x)-exp(-x))/(1-exp(-x))^2
f (generic function with 1 method)
julia> f(1.0e-7)
0.9992008230547272
julia> f(1.0e-8)
0.0
The problem ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9399133498259924,
"lm_q1q2_score": 0.8490182794193459,
"lm_q2_score": 0.9032942021480236,
"openwebmath_perplexity": 3790.1935699635287,
"openwebmath_score": 0.6842126846313477,
"tags":... |
We have the letters: .$A,A,B,D,H,I,M,N,U.$
We want: .$\_\,\_\,\_\,\_\,\_\,\_\,\_\,\_\,I$
[COLOR=#be00e]n . . . . . . .[/COLOR]$\uparrow$
. . . . . . $\sim\!M$
[1] The first letter is $A\!:\;A\,\_\,\_\,\_\,\_\,\_\,\_\,\_\,I$
. . .The remaining spaces can be filled in $7!$ ways.
[2] The first letter is not $A$ and not... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9817357211137667,
"lm_q1q2_score": 0.8026420657683131,
"lm_q2_score": 0.8175744739711883,
"openwebmath_perplexity": 487.18008235803336,
"openwebmath_score": 0.9358024597167969,
"t... |
general-relativity, differential-geometry, metric-tensor, warp-drives
Title: How can I understand $\mathrm ds^2 = -c\,\mathrm dt^2 + [\mathrm dx-v_s(t)f(r_s)\mathrm dt]^2 +\mathrm dy^2 +\mathrm dz^2 $ in the simplest way? How can I understand this equation $$\mathrm ds^2 = -c\,\mathrm dt^2 + [\mathrm dx-v_s(t)f(r_s)\m... | {
"domain": "physics.stackexchange",
"id": 28523,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, differential-geometry, metric-tensor, warp-drives",
"url": n... |
special-relativity, group-theory, lie-algebra, poincare-symmetry, invariants
Title: Physical meaning of the Casimir operators of Poincarè algebra If one considers the algebra $su(2)$, it is well known that the Casimir Operator is
$$
C=L_1^2+L_2^2+L_3^2.
$$
It corresponds to the total angular momentum and correctl... | {
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"tags": "special-relativity, group-theory, lie-algebra, poincare-symmetry, invariants",
"... |
## Python 2, 45 - 4 - 4 = 37
a=1;b=0
exec"a,b=b,34*b-a+2;"*input()
print a
Iterates using the reccurence
f(0) = 1
f(1) = 0
f(k) = 34*f(k-1)-f(k-2)+2
In theory, this supports numbers of any size, but runs in exponential time, so it shouldn't qualify for the bonuses. Should work for numbers of any size. For example... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9715639677785087,
"lm_q1q2_score": 0.8053670694467869,
"lm_q2_score": 0.8289387998695209,
"openwebmath_perplexity": 3566.4252355304875,
"openwebmath_score": 0.27517256140708923,
"t... |
gauge-theory, yang-mills, instantons, moduli, algebraic-geometry
The moduli space of framed instantons $M_\text{in}$ is in bijection to the subset $M^\text{reg}_{0,\text{sh}}\subset M_\text{sh}$ of locally free sheaves. | {
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"tags": "gauge-theory, yang-mills, instantons, moduli, algebraic-geometry",
"url": null
} |
inorganic-chemistry, solubility, stability
Title: What is the relation between solubility and thermal stability? The thermal stability of alkaline earth metals increases down the group for hydroxides i-e., Be(OH)2 is less stable than Ba(OH)2.
The solubility also increases down the group for these compounds i-e., Be(OH... | {
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"tags": "inorganic-chemistry, solubility, stability",
"url": null
} |
c++, recursion, reinventing-the-wheel, template, c++20
Image<ElementT>& operator/=(const Image<ElementT>& rhs)
{
assert(rhs.width == this->width);
assert(rhs.height == this->height);
std::transform(image_data.cbegin(), image_data.cend(), rhs.image_data.cbegin(),
... | {
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"openwebmath_score": null,
"tags": "c++, recursion, reinventing-the-wheel, template, c++20",
"url": null
} |
classical-mechanics, collision, terminology
Title: What phrases describe collisions with coefficients of restitution less than zero or greater than one? The coefficient of restitution describes the elasticity of a collision:
1 = perfectly elastic, kinetic energy is conserved
0 = perfectly inelastic, the objects move... | {
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"openwebmath_score": null,
"tags": "classical-mechanics, collision, terminology",
"url": null
} |
experimental-physics, scattering
Title: How do you convert P_lab into Sqrt(s) in scattering experiments? In some scattering experiments, sometimes the energy, sqrt(s) is reported. Sometimes momentum, p_lab is reported for the experiment. How do you convert from p_lab into sqrt(s)?
For example in this in Figure 72 and ... | {
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"openwebmath_score": null,
"tags": "experimental-physics, scattering",
"url": null
} |
optics, geometric-optics, lenses
Is there some other information I am missing?
Thanks in advance! You are correct. You don't have enough information to know the focal length of the mirror (or its radius).
All you do know is the magnification: $m=h_{image}/h_{object}$. This also determines the ratio of the image... | {
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"tags": "optics, geometric-optics, lenses",
"url": null
} |
theoretical-biology, stem-cells
Higher $P_0$ means that occupying half the receptor sites requires a higher concentration, which means you need more drug for the same effect, i.e. the efficacy of the drug is poorer; this is why $P_0$ appears on the denominator: as it increases, the effect of the drug on the cells (giv... | {
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"id": 8781,
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"openwebmath_score": null,
"tags": "theoretical-biology, stem-cells",
"url": null
} |
python, game, curses
colors_enum.py
from enum import Enum
class Color(Enum):
SPRITE = 1
BALL = 2
TILE = 3
directions_enum.py
from enum import Enum
class Direction(Enum):
RIGHT = 1
LEFT = 2 Wow, no import pygame,
this is strictly a colorful curses project.
A bold design move!
The animated demo im... | {
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"openwebmath_score": null,
"tags": "python, game, curses",
"url": null
} |
quantum-mechanics, quantum-information, quantum-teleportation
Title: Why is quantum teleportation needed to transmit a state? Suppose that Alice wants to teleport the state $|\psi \rangle = \alpha |0 \rangle + \beta |1 \rangle$ to Bob. My issue is why quantum teleportation is needed to transmit this state. Why is it n... | {
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"tags": "quantum-mechanics, quantum-information, quantum-teleportation",
"url": null
} |
general-relativity, differential-geometry, differentiation, vector-fields, vortex
$
V_\beta R^\beta \,_{\nu \sigma \rho} = \nabla_{[\rho}\nabla_{\sigma]} V_\nu
$
So my take at it is that you are measuring the component $ r $ (radial distance) of the vector that tells you what the difference is between transporting $ V... | {
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"tags": "general-relativity, differential-geometry, differentiation, vector-fields, vortex"... |
machine-learning, python, keras, cnn, image-classification
data, labels = ReadImages(TRAIN_DIR)
print(data[0])
model.fit(np.array(data), np.array(labels), epochs=10, batch_size=20)
model.save('model.h5')
detail: when I print (data[0]) it return:
[0 0 0]
[0 0 0]
...
[1 0 0]
[2 2 2]
[0 0 0]]
[[3 0 0]
[... | {
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"tags": "machine-learning, python, keras, cnn, image-classification",
"url": null
} |
forces, electrostatics, electricity, charge, everyday-life
Exactly. Air is not a perfect insulator, so electrons "escape" from the surface of the comb and are dissipated in the environment. They just, so to speak, "jump off" (or "on") the comb.
Also, as @AndrewSteane has noted, the comb probably rested on something, a... | {
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"openwebmath_score": null,
"tags": "forces, electrostatics, electricity, charge, everyday-life",
"url": null
} |
c++, recursion, lambda, c++20
The part of the template function recursive_transform which handle the std::variant structure:
template<class T, class _Fn> requires is_iterable<T> && is_element_variant<T>
static T recursive_transform(const T _input, _Fn _Func); // Deal with the iterable case which its element is ... | {
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"url": null
} |
sexact[x_] := Piecewise[{{-0.5*(x^2 - 2), x < Sqrt[2]}, {0, x > 0}}]
but I found the numerical process very interesting and would like to learn how is best performed to get high accuracy. I am unable to retrieve anything close to separatrix motion, just periodic.
This is how I approached it. Start with $$\delta = 0.... | {
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"lm_q2_score": 0.8418256551882382,
"openwebmath_perplexity": 902.0248722421479,
"openwebmath_score": 0.6717526316642761,
"tag... |
c, strings
dest_len = strlen(dest);
src_len = strlen(src);
if (dest_len+src_len>= size) return dest_len+src_len;
memcpy(dest+dest_len, src, src_len+1);
return dest_len+src_len;
} | {
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"id": 793,
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"openwebmath_score": null,
"tags": "c, strings",
"url": null
} |
ros, ros-groovy, dependencies
Depends: ros-groovy-image-common (= 1.9.22-0quantal-20121230-1342-+0000) but it is not going to be installed
Depends: ros-groovy-bond-core (= 1.7.9-0quantal-20121230-1142-+0000) but it is not going to be installed
Depends: ros-groovy-c... | {
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"id": 12239,
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"openwebmath_score": null,
"tags": "ros, ros-groovy, dependencies",
"url": null
} |
computer-architecture, digital-circuits
Title: Conversion from Decimal form to BCD I have seen a way how to convert a decimal number to BCD (packed & unpacked) using 8,4,2,1 weighing forms but how to do it using 4,2,2,1 and 7,4,2,1 ? Any method please.Suggestions If we want to represent 8 base 10 then it will be repre... | {
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"tags": "computer-architecture, digital-circuits",
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} |
python, search, google-app-engine
And put it, along the form.w.choices list (which is actually exactly the same dictionary) outside the class, or as an instance variable. It should probably be read from a file, but that's a different story.
You can turn most of the local variables into instance variables.
The most bas... | {
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electric-circuits, capacitance, batteries, electrochemistry
The electric field of battery doesn't do any work initially since the
capacitor is uncharged in the beginning.
Correct, because the voltage across the uncharged capacitor is zero. The potential difference $V$ between two points is defined as the work require... | {
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Say we know that there are solutions to $$ax+by=\gcd(a,b)$$; then if $$k$$ is an integer, there are obviously solutions to $$ax+by=k\gcd(a,b)$$. Just take a solution to the first equation, and multiply it by $$k$$. In this manner, if $$d\neq \gcd(a,b)$$, the equation can be "reduces" to one in which $$d=\gcd(a,b)$$. In... | {
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"openwebmath_score": 0.8840072751045227,
"tag... |
rotational-dynamics
$$v=\omega R$$
where $R$ is the radius of the sphere.
Does friction play a part in the energy balance? Yes.
Let $T$ be the total energy of the sphere, $U$ be the potential energy of the sphere and $K$ its kinetic energy, then because the friction force does no work and we assume no other external f... | {
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"tags": "rotational-dynamics",
"url": null
} |
newtonian-mechanics, forces, inertial-frames, definition
Scientific method tells that anything that can't be shown by evidence (by collecting data from observations) can be assumed to be non existent since something that no interaction reveals has no physical consequences and thus is indistinguishible from non existen... | {
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"tags": "newtonian-mechanics, forces, inertial-frames, definition",
"url": null
} |
# Does every prime divide some Fibonacci number?
I am tring to show that $\forall a \in \Bbb P\; \exists n\in\Bbb N : a|F_n$, where $F$ is the fibonacci sequence defined as $\{F_n\}:F_0 = 0, F_1 = 1, F_n = F_{n-1} + F_{n-2}$ $(n=2,3,...)$. How can I do this?
Originally, I was trying to show that $\forall a\in\Bbb N\;... | {
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13. Solution: It is false. Let $e_1, \dots, e_n$ be an orthonormal basis of $V$ and define $Se_j = e_1$ for $j = 1, \dots, n$. Then $||Se_j|| = 1$ for each $e_j$, but obviously $S$ is not invertible, therefore $S$ is not an isometry (7.42 requires isometries to be invertible).
14. Solution: In the exercise, $T$ was al... | {
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"lm_q2_score": 0.817574471748733,
"openwebmath_perplexity": 280.0290386114009,
"openwebmath_score": 0.9965819120407104,
"tag... |
companion to "Hitchhiker's Guide to the Galaxy. torus view square lotus flower (awa seed of cop yr. Get an answer for '(x-h)^2+y^2=r^2 , h>r Find the volume of the torus generated by revolving the region bounded by the graph of the circle about the y-axis. Mathworld -- Pappus's Centroid Theorem. SPX1a was localized in ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9895109071934598,
"lm_q1q2_score": 0.8043410793442721,
"lm_q2_score": 0.8128673201042492,
"openwebmath_perplexity": 823.0098102989588,
"openwebmath_score": 0.754847526550293,
"tag... |
php, object-oriented, database, pdo
However, the best solution you can get will question the function's existence itself. Because the best way to protect the field names is to whitelist them, but the best way to whitelist table fields is... to list them explicitly in the query. And if you list them in the query, there... | {
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"url": null
} |
c++, c++11, vectors, raii, sfinae
I believe this shows the intent much more directly, and (thanks to short-circuit evaluation) still avoids evaluating std::equal if the sizes aren't equal.
Some of the names also seem somewhat misleading. For example, I'd rename resizeIfRequire to something like reallocIfRequired, sinc... | {
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Without a graphing utility and short of graphing both functions very accurately to tell this, is there any other way to see that this is what the question was asking for?
#### SuperSonic4
##### Well-known member
MHB Math Helper
I was given a problem with two functions and two x-values for boundaries, so I found the p... | {
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"openwebmath_score": 0.7942792773246765,
... |
electronics, semiconductor-physics
Title: How do Zener diodes survive the breakdown during reverse bias? My highschool textbook states that Zener diodes are a special type of diode which is made of highly doped p and n junctions, and which can survive reverse bias - unlike normal diodes, which get damaged due to the e... | {
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Sent from my iPhone using GMAT Club Forum
Kudos [?]: 0 [0], given: 2
Math Expert
Joined: 02 Aug 2009
Posts: 5365
Kudos [?]: 6151 [0], given: 121
Re: 5 drill machines can drill 15 meters in 5 hours. [#permalink]
### Show Tags
06 Nov 2017, 06:32
ManishKM1 wrote:
5 drill machines can drill 15 meters in 5 hours. Assu... | {
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"openwebmath_score": 0.4197961688041687,
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"url": "... |
javascript, d3.js
var dataSet = d3.csvParse(csvData)
row1(dataSet);
function row1(data) {
var check = false;
update(check);
function update(check) {
var team = d3.selectAll(".select1").property("value")
data.forEach(function(d, i, columns) {
d.male = +(d.male);
d.female = +(d.female);
... | {
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"openwebmath_score": null,
"tags": "javascript, d3.js",
"url": null
} |
keras, nlp, text-classification, gensim, doc2vec
Given such low accuracies, I did not tune the hyperparameters of these classifiers.
I think I should build a model with higher baseline performance first.
New Strategy
I thought that training a Doc2Vec embedding of the input data and using it to train the keras neural n... | {
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"tags": "keras, nlp, text-classification, gensim, doc2vec",
"url": null
} |
c++, object-oriented, hash-map
On to the Tester class....
bool operator()(const Test & LQuery, const Test & RQuery) const {
return LQuery.name.compare(RQuery.name) < 0;
}
Since the compare() method is noexcept, you could make the whole function noexcept.
But is there any real reason to use compare() explicitly? Why... | {
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-
I am not stating what the dot product signifies, in fact that is the essence of this question, I did not know that the dot product has an equivalent geometric definition, or that it could be used to calculate the angle between two vectors that is extremely useful. – Jonn_Underwood Jun 8 '13 at 15:45
I didn't intend ... | {
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"openwebmath_perplexity": 177.29955373726372,
"openwebmath_score": 0.9262725710868835,
"ta... |
keras, tensorflow
Title: Issue replicating AutoKeras StructuredDataClassifier I have a model that I generated using AutoKeras and I want to replicate the model so that I can construct it with keras tuner to do further hyperparameter tuning. But I am running into issues replicating the model. The model summary of the a... | {
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"tags": "keras, tensorflow",
"url": null
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python, python-3.x, calculator, gui, tkinter
It is better to keep this dirty data in a separate module in order not to pollute your class. This will also allow you to add addition buttons in the future if needed.
Here is the GUI class:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import calculator_data
import tk... | {
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"tags": "python, python-3.x, calculator, gui, tkinter",
"url": null
} |
thermodynamics, temperature, entropy, reversibility
Title: How can the temperature of the surroundings be constant during a reversible thermodynamic process? I am having trouble reconciling the following statements I have recently learned about thermodynamics:
The temperature of the surroundings is taken to be consta... | {
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"tags": "thermodynamics, temperature, entropy, reversibility",
"url": null
} |
c++, algorithm
Rethink the algorithm
There are problems with the current algorithm. It produces this result:
...X..X..X..X..X..X..X..X.....X.....X.....X......X
It's not hard to notice that people on the left are closer together than they need to be and people are the right have extra room. Hint: there is a simple m... | {
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"tags": "c++, algorithm",
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} |
ros, 3d-object-recognition
except IndexError:
pass
print("callback1 releases lock")
def callback2(self, msg):
depth_image = self.bridge.imgmsg_to_cv2(msg, desired_encoding='passthrough') #convert to opencv format
self.c2_time_stamp = msg.header.stamp | {
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"tags": "ros, 3d-object-recognition",
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} |
general-relativity, differential-geometry, reference-frames, observers
However! The resulting answer depends on the path you use to connect the two points, and curvature measures precisely the amount that these differ with the choice of two paths. The reason it works in special relativity is because the curvature is 0... | {
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"tags": "general-relativity, differential-geometry, reference-frames, observers",
"url": ... |
quantum-mechanics, heisenberg-uncertainty-principle, particle-physics, nuclear-physics
Title: Uncertainty Principle on System of particles I am new to Quantum Mechanics. I read the uncertainty principle - it says there are pairs of physical quantities which can't both be determined with certainty for a particle.
My qu... | {
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"tags": "quantum-mechanics, heisenberg-uncertainty-principle, particle-physics, nuclear-phys... |
haskell, monads
Title: Implementation of partitionM I needed a monadic version of partition today. I settled on the following version:
partitionM :: Monad m => (a -> m Bool) -> [a] -> m ([a], [a])
partitionM p xs = bimap (map fst) (map fst) . partition snd . zip xs <$> mapM p xs
Then I realized it's already implement... | {
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waves
In your question, 'initial state' should be taken to mean the values of the physical property in the absence of the wave. So, in the case of a water wave, the initial state is the surface level of the water before it was disturbed by the wave.
Waves can be superimposed and interfere with each other. If you drop ... | {
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ros, rviz, base-link, pointcloud
Original comments
Comment by Ben_S on 2013-01-19:
Sounds like a problem with your transforms (what does the red text say?). Please run rosrun tf view_frames and upload the output somewhere.
Comment by Karan on 2013-01-19:
The error says "Message removed because it is too old" could thi... | {
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"tags": "ros, rviz, base-link, pointcloud",
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c++, file, console, windows, quiz
#pragma once
#include <fstream>
#include <sstream>
#include <cstdio>
#include <fcntl.h>
#include <io.h>
#include "Vocabulary.h"
namespace voc {
class File_Vocabulary {
public:
File_Vocabulary(const std::string& in_filename);
void add(const Vocabulary& v);
... | {
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"tags": "c++, file, console, windows, quiz",
"url": null
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python, algorithm, python-2.x, recursion
With these options implemented you'll get the following (untested) code:
def is_bst(node, key_min=None, key_max=None):
"""Checks is the subtree rooted at this node is a BST."""
if node is None:
return True
if (not key_max and node.key >= key_max) \
... | {
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"tags": "python, algorithm, python-2.x, recursion",
"url": null
} |
|Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only ) Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6955 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: If n is the product of 3 consecutive integers, which of the following [#permalink] ### Show Tags 21 Nov 2016, 01:02 ==> The product of 3 consecutive... | {
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"lm_q1_score": 0.9161096090086368,
"lm_q1q2_score": 0.8069066595558794,
"lm_q2_score": 0.8807970701552505,
"openwebmath_perplexity": 3087.6339661688135,
"openwebmath_score": 0.5774070024490356,
"tags": ... |
quantum-field-theory, hilbert-space, fourier-transform, spinors
Title: In which mathematical space do the spinors act on? I'm studying QFT and from what I've learnt so far is that a general quantum field $\widehat{\phi}(x)$ can be decomposed (at least for the fermion case) as
$$\widehat{\phi}(x)=∫\frac{d^{3}p}{(2\pi)^... | {
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"tags": "quantum-field-theory, hilbert-space, fourier-transform, spinors",
"url": null
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java, playing-cards
System.out.println("Your bid amount was less than what p1 bidded, now your bid amount is $" + p1bidAmount + " because of that.");
p2bidAmount = p1bidAmount;
if(p2money >= p2bidAmount)
p2money -= p2bidAmount;
else {
p2money = 0;
... | {
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"tags": "java, playing-cards",
"url": null
} |
reference-request, approximation-algorithms, optimization, metric-spaces, diameter
Title: Finding the size $k$ subset in a metric space that maximizes the min distance between elements I have a metric space $(X,d)$ and I'd like to find a subset of size k of far away elements.
We can cast this as the following optimiz... | {
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"openwebmath_score": null,
"tags": "reference-request, approximation-algorithms, optimization, metric-spaces, diameter... |
quantum-gate, measurement, clifford-group
Title: Applying Clifford Gate before a Pauli Measurment I am reading a paper where they describe different randomised measurement protocols. I am confused about a simple case of this protocol that they discuss.
The link of the paper is here , and I am talking about the subsect... | {
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"tags": "quantum-gate, measurement, clifford-group",
"url": null
} |
c, strings, file, steganography
This code returns the last character read, so that EOF can be used as an indication of error (that is, the file is too short to encode the message).
One can also create the reverse functions in very similar manner.
Be aware of file modes differences
On POSIX compliant operating systems,... | {
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"tags": "c, strings, file, steganography",
"url": null
} |
python, performance, chess
piece_letters = "KkQqRrNnBbPp"
for x in range(64):
sq = str(node.board().piece_at(x))
if sq in piece_letters:
d[sq].append(chess.SQUARE_NAMES[x])
Consider these two (invalid) extremes:
When the board is full of K, the evaluation of sq in piece_letters will terminate... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, chess",
"url": null
} |
electromagnetism, thermodynamics, electromagnetic-radiation, thermal-radiation
Title: Why does the Stefan-Boltzmann Law contain no information about the distance from the radiating body? The Stefan–Boltzmann law states that the power radiated per unit area of a black body is equal to:
$$ \frac{dP}{dA} = \sigma \cdot T... | {
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"tags": "electromagnetism, thermodynamics, electromagnetic-radiation, thermal-radiation",
... |
python, kivy
file_path = file_dialog.GetPathNames()
shutil.copy(self.image_cover_art.source, file_path[0])
def album_art_all_songs(self, album: AnyStr, album_artist: AnyStr) -> None:
"""
Apply album art to all songs of the same album and artist
:param album: the album name whi... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, kivy",
"url": null
} |
error-correction, terminology-and-notation, stabilizer-code, nielsen-and-chuang
'Syndromes' represent information that can actually be obtained about an error by 'coherent measurement' — that is, by measuring operators $P \in \mathscr S$ as observables (a process which is usually simulated by eigenvalue estimation). A... | {
"domain": "quantumcomputing.stackexchange",
"id": 113,
"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": "error-correction, terminology-and-notation, stabilizer-code, nielsen-and-ch... |
python, beginner, python-2.x
Never touching Python until recently and taking a huge interest into it - I want to make sure I am doing it right and would like any pointers from people with more experience. I have tried my best to follow the PEP8 standard and tried to comment (might be too much...) my code so that other... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, python-2.x",
"url": null
} |
oxidation-state, electronegativity
the algebraic sum of oxidation states of all atoms in a neutral molecule must be zero, while in ions the algebraic sum of the oxidation states of the constituent atoms must be equal to the charge on the ion. For example, the oxidation states of sulfur in $\ce{H2S}$, $\ce{S8}$ (elemen... | {
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"id": 2352,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "oxidation-state, electronegativity",
"url": null
} |
Integrals, Sequences and Series. The fundamental theorem of integral calculus is great, but it's not without its limitations. Consider the improper integral ∫ 1 1 1 xp dx: Integrate using the generic parameter p to prove the integral converges for p > 1 and diverges for p ≤ 1 (you will have to distinguish between the c... | {
"domain": "claudiaerografie.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9886682444653242,
"lm_q1q2_score": 0.8151193339077226,
"lm_q2_score": 0.8244619350028204,
"openwebmath_perplexity": 525.4508902781389,
"openwebmath_score": 0.9661898612976074,
... |
# Finding Number of Factors of an integer - question?
Question banks Downloads My Bookmarks Reviews Important topics
Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endor... | {
"domain": "gmatclub.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9489172630429475,
"lm_q1q2_score": 0.8027293859882257,
"lm_q2_score": 0.8459424411924673,
"openwebmath_perplexity": 2557.797955510358,
"openwebmath_score": 0.5062371492385864,
"tags":... |
# excel permutations with repetition
## excel permutations with repetition | {
"domain": "ase.ro",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9609517061554854,
"lm_q1q2_score": 0.8049123328750193,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 883.2959517901801,
"openwebmath_score": 0.7086213827133179,
"tags": nul... |
np-hardness, reductions
Title: Validity of exponentiation in a polynomial time reduction I asked this question 10 days ago on cs.stackexchange here but I didn'y have any answer.
In a very famous paper (in the networking community), Wang & Crowcroft present some $\mathsf{NP}$-completeness results of path computation un... | {
"domain": "cstheory.stackexchange",
"id": 3824,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "np-hardness, reductions",
"url": null
} |
graphs, greedy-algorithms
Title: Time complexity of a greedy approach for Independent Set: the Heaviest-First Algorithm The heaviest-first algorithm is a greedy approximation algorithm that finds an independent set $S$ of nodes in a graph $G=(V,E)$, so that the sum of the weights of the nodes in $S$ is as large as pos... | {
"domain": "cs.stackexchange",
"id": 8055,
"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": "graphs, greedy-algorithms",
"url": null
} |
organic-chemistry, nomenclature, amines
Title: Naming a tri-substituted amine Just came across this couldn't decide how to name it, anyone think they can give it a go?
$\hspace{7cm}$ This is N-ethyl-N-methylpropan-2-amine. The base of this amine is propan-2-amine, and the nitrogen is substituted wit... | {
"domain": "chemistry.stackexchange",
"id": 5689,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, nomenclature, amines",
"url": null
} |
reaction-mechanism
Title: Elimination reaction In this question i understand that we have to break C- N bond. But which one to choose? This is an example of Cope Elimination where the base takes up hydrogen from the least sterically hindered Carbon atom to avoid crowding in the Transition state. Hence, Hoffman Alkene ... | {
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"id": 13510,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reaction-mechanism",
"url": null
} |
homework-and-exercises, electric-circuits, electric-current, electrical-resistance, capacitance
Title: Why doesn't a bird on an electric line get electrocuted? KVPY 2017
A bird sitting on a single high tension wire does not get electrocuted because
A) the circuit is not complete
B) the bird feet has an insulating co... | {
"domain": "physics.stackexchange",
"id": 44758,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electric-circuits, electric-current, electrical-resistance... |
acid-base
Title: Which of the following is the strongest base?
Which of the following is the strongest base?
$\ce{LiOH}$
$\ce{CH3Li}$
$\ce{LiNH2}$
$\ce{LiF}$ | {
"domain": "chemistry.stackexchange",
"id": 2465,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "acid-base",
"url": null
} |
newtonian-mechanics, rotational-dynamics, everyday-life
P = the power required to do a wheelie
m = mass of the motorcycle
v = velocity of the motorcycle
a = acceleration required to do a wheelie
And it's here that it makes no sense to me, and my question is : why would the power required to do a wheelie depend of the... | {
"domain": "physics.stackexchange",
"id": 53679,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, rotational-dynamics, everyday-life",
"url": null
} |
ros, python, rostest
Title: Python rostest succeeds and fails
When i run the unit test using rostest command it fails, when I run it using rosrun it always succeeds.
ROSRUN: ALWAYS SUCCEEDS
I am trying to create simple unit test that does nothing, it always returns the following :
SUMMARY:
* RESULT: SUCCESS
* TESTS... | {
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"id": 29369,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, python, rostest",
"url": null
} |
sampling, filtering, ecg
Question 1) What strategy is needed in terms of subsampling, filtering to preprocess the data to clean get a clean ECG signal (google how it should look).
Why subsample? The signal is already in a bad state, why make it even worse? You could try a bandpass filter between 0.1 - 100Hz. This wou... | {
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"id": 4808,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "sampling, filtering, ecg",
"url": null
} |
c++, email, state-machine, sml
How does all this correspond to the "canons" of state machines?
Not overkill?
Full code on GitHub repo
Thanks! Unnecessary use of std::unique_ptr
You are using std::unique_ptr when there is no need for it. Both pmailio and imapsThread can just be stored by value:
struct Imap { void opera... | {
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"tags": "c++, email, state-machine, sml",
"url": null
} |
is d, then the nth term of the sequence is given by:The sequence is able to be found by using the geometric sequence formula. Loading Unsubscribe from slcmath@pc? Cancel Unsubscribe. In order to work with these application problems you need to make sure you have a basic understanding of arithmetic sequences, arithmetic... | {
"domain": "givelife.ph",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9865717468373085,
"lm_q1q2_score": 0.8443585556551937,
"lm_q2_score": 0.8558511414521922,
"openwebmath_perplexity": 333.5769276148712,
"openwebmath_score": 0.7515195608139038,
"tags": nu... |
javascript, jquery, html, form, jquery-ui
.color-blue {
background-color: #99CEE8;
}
.color-brown {
background-color: #96776B;
}
.color-cream {
background-color: #EAE3D9;
}
.color-green {
background-color: #BED6A4;
}
.color-grey {
background-color: #919191;
}
.color-orange {
background-color: #FF9D78;... | {
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"id": 25493,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, html, form, jquery-ui",
"url": null
} |
ros, octomap, fcl, boost, octree
Title: generating boxes from octomap::octree error
I am using the fcl where I have an octree and I want to generate boxes from an octree function
I used the following code:
octomap::OcTree* st_tree = new octomap::OcTree(0.1);
octomap::Pointcloud st_cld;
// I fill the tree
... | {
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"tags": "ros, octomap, fcl, boost, octree",
"url": null
} |
c#, file, stream
/// <summary>
/// Gets the file name from the current client stream
/// </summary>
/// <returns>Returns the file name as a string</returns>
private static string GetFileName()
{
byte[] fileNameLengthBytes = new byte[sizeof(int)];
clientStream.Read(fileNameLengthByte... | {
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"id": 6685,
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"openwebmath_score": null,
"tags": "c#, file, stream",
"url": null
} |
java, game
public void go() {
frame = new JFrame();
// up = new JButton();
//down = new JButton();
controls = new JTextField();
drawPanel = new MyDrawPanel();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(controls);
controls.requestFocus();
controls.addKeyListener... | {
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"id": 27325,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, game",
"url": null
} |
mathematical-physics, history, mathematics, big-list
4) What are examples that solid mathematical understanding of certain issues from physics came from further developements in physics itself. (In particular, I am interested in cases where mathematical rigorous understanding of issues from classical mechanics require... | {
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"id": 3594,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mathematical-physics, history, mathematics, big-list",
"url": null
} |
conformal-field-theory, commutator, correlation-functions
$$\langle\mathcal{O}(z_2,\bar{z}_2)\mathcal{O}(z_1,\bar{z_1})\rangle=e^{\pm 2\pi i s}\frac{C}{(z_1-z_2)^{2h}(\bar{z}_1-\bar{z}_2)^{2\bar{h}}}$$
where $s=h-\bar{h}$ is the spin of $\mathcal{O}$ and $\pm$ depends on the choice of the branch cut for the power func... | {
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"id": 64929,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "conformal-field-theory, commutator, correlation-functions",
"url": null
} |
python, game, tic-tac-toe, pygame, connect-four
#Absolute coordinates for pygame
chunk_coordinates = [(0, - i * self.chunk_height) for i in range(self.segments)]
self.line_coordinates = [((self.size_x, self.centre - self.size_y),
(self.size_x, self.size_y - self.centr... | {
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"id": 16526,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, game, tic-tac-toe, pygame, connect-four",
"url": null
} |
ros, gazebo, ros-control, ros-kinetic
Title: Could not find resource '[]' in 'hardware_interface::EffortJointInterface'
Hello,
The answers at questions: 1, 2 etc, does not seem to be solving this. I am having trouble setting up basic controllers in Gazebo. Can you please help me out with this please?
When I launch th... | {
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"tags": "ros, gazebo, ros-control, ros-kinetic",
"url": null
} |
backpropagation, policy-gradients
and the total reward for the trajectory was 50
Ignoring the rest of the backprop at the current timestep, $\frac{1}{\pi_{\theta}(a_{t}|s_{t})}$ will give us:
[2, 10, 10, 10, 10, 10] | {
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"openwebmath_score": null,
"tags": "backpropagation, policy-gradients",
"url": null
} |
image-processing, wavelet, 2d
LOW_A0_H1, LOW_A0_V1 and LOW_A0_D1. Finally, in the last scale decomposition, you will split LOW_A0_A1 into its corresponding approximation coefficients LOW_A0_A1_A2 and the final detail coefficient images LOW_A0_A1_H2, LOW_A0_A1_V2 and LOW_A0_A1_D2. | {
"domain": "dsp.stackexchange",
"id": 1091,
"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": "image-processing, wavelet, 2d",
"url": null
} |
rosmake, osx
"class_loader::class_loader_private::getFactoryMapForBaseClass(std::string const&)", referenced from:
std::map<std::string, class_loader::class_loader_private::AbstractMetaObjectBase*, std::less<std::string>, std::allocator<std::pair<std::string const, class_loader::class_loader_private::AbstractM... | {
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"id": 13110,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rosmake, osx",
"url": null
} |
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