text stringlengths 1 1.11k | source dict |
|---|---|
ros, gazebo, rviz, moveit, planning-scene
I don't understand this... so confusing, but ok
Comment by v4hn on 2017-05-19:
The frame has to be specified. Otherwise MoveIt wouldn't know how to interpret the pose w.r.t. the rest of the setup.
The sleep might be necessary to ensure the scene interface is connected to the m... | {
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"tags": "ros, gazebo, rviz, moveit, planning-scene",
"url": null
} |
Since $l = 4w$, the area $A = lw$ can be expressed as a function of $w$. $$A(w) = (4w)w = 4w^2$$ Differentiating with respect to time yields $$\frac{dA}{dt} = 8w \frac{dw}{dt}$$ If we work with $\text{cm}$, we obtain $$\frac{dA}{dt} = 8(15~\text{cm})\left(0.2~\frac{\text{cm}}{\text{s}}\right) = 24~\frac{\text{cm}^2}{\t... | {
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"openwebmath_score": 0.9222348928451538,
"tags... |
vba, excel
Private Type THelper
Name As String
Address As String
CityStateZip As String
Zip As String
HomePhone As String
CellPhone As String
Phone As String
BSA As String
TableName As String
ErrNumber As Long
End Type
Private this As THelper
Public Property Get Name() As Stri... | {
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} |
homework-and-exercises, newtonian-mechanics, rotational-dynamics, reference-frames
Title: How can this hinge point be at rest?
The given situation is shown in figure, my doubt is that point O must be accelerating but it is not possible.
Where am I going wrong in my method?
Please help Unfortunately, it is a mistake t... | {
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"tags": "homework-and-exercises, newtonian-mechanics, rotational-dynamics, reference-frames... |
mobile-robot
We believe SMA meets the first two constraints well, but need some guidance on achieving constraint 3, i.e. different levels of pressure of the gripper controlled electronically.
My questions:
Can PWM of a current above the activation threshold (320 mA for 0.005 inch Flexinol HT) provide variable, repeat... | {
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"tags": "mobile-robot",
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} |
1. Let total distance=X.
1st distance =30x/100.Speed=20kmph
2nd distance=60x/100 Speed=40kmph
3rd distance=10x/100Speed=10kmph
T1=1/20*30x/100 = 3x/200
T2=1/40*60x/100 =3x/200
T3=1/10*10x/100 =X/100
Applying S=D/T Formula
30x/100+60x/100+10x/100
______________________________
3x/200+ 3x/200+ X/100.
=100x*200/8x*100
=25... | {
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"tags": ... |
This theorem helps to explain part of our interest in nonsingular matrices. If a matrix is nonsingular, then no matter what vector of constants we pair it with, using the matrix as the coefficient matrix will always yield a linear system of equations with a solution, and the solution is unique. To determine if a matrix... | {
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"lm_q1_score": 0.9891815494335754,
"lm_q1q2_score": 0.8285582151713394,
"lm_q2_score": 0.8376199653600372,
"openwebmath_perplexity": 239.03364663626417,
"openwebmath_score": 0.7948904037475586,
"tags": nu... |
ros2, ubuntu-precise, ubuntu
With the caveat that robufast.urdf above has already been expanded by xacro.
Originally posted by jacobperron with karma: 1870 on 2020-03-17
This answer was ACCEPTED on the original site
Post score: 1 | {
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"tags": "ros2, ubuntu-precise, ubuntu",
"url": null
} |
special-relativity, inertial-frames, observers, time-dilation, causality
My question is really motivated from simultaneity being frame dependent, so that one person saying they saw something is a bit subjective : A person could say they saw 2 light sources light up at the same time, but other could say they light up a... | {
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"tags": "special-relativity, inertial-frames, observers, time-dilation, causality",
"url"... |
forces, energy-conservation, friction, work
In general, the work done by a force is path independent if and only if the work done on any closed curve vanishes. Note that friction is always opposite to the motion so its work will be negative for any curve, in particular, for any closed curve. | {
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"tags": "forces, energy-conservation, friction, work",
"url": null
} |
$$\begin{array}{cc} 0: &100, \\ 1: &200, \\ 4: &200, \\ 5: &100, \\ 6: &200, \\ 9: &200 \end{array}$$
So, why does this happen? What is the property that all integers have?
• This is called the set of quadratic residues modulo $10$. May 24 '18 at 23:42
• For your first question, you’re simply asking what is $x^2 \mod... | {
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"lm_q2_score": 0.8333245932423308,
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"openwebmath_score": 0.6871822476387024,
"ta... |
python, beginner, quiz
This can be shortened further with the standard library. Python gives us operator which defines all of these functions:
choice = {'+': operator.add,
'-': operator.sub,
'*': operator.mul
}
The advantage of avoiding the repetition is how easy it becomes to add new operators. Let's sa... | {
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"tags": "python, beginner, quiz",
"url": null
} |
javascript, jquery, game, dom
Graphically the DOM is optimized for everyone, and thus sadly is not optimized for your need or anyone else.
We use the canvas because the canvas lets us skip the DOM's re-flow and compositing and control the process directly and only with our special needs in mind. This lets us skip a zi... | {
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"tags": "javascript, jquery, game, dom",
"url": null
} |
c#, bloom-filter
Title: Bloom Filter C# Here is a bloom filter I made in C#:
public class BloomFilter
{
private BitArray PosValues = new BitArray(int.MaxValue);
private BitArray NegValues = new BitArray(int.MaxValue);
public void AddValue(int HashCode)
{
if (HashCode > 0)
{
... | {
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} |
electrostatics, renormalization, regularization
Title: Determination of auxiliary scale in dimensional regularization My questions are in italics. In the article [1] a dimensional regularization is presented on an electrostatic example of an infinite wire with constant linear charge density $\lambda$. It is shown that... | {
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"tags": "electrostatics, renormalization, regularization",
"url": null
} |
electromagnetism, electromagnetic-radiation
(1)
From J.D.Jackson's $^{\prime}$Classical Electrodynamics$^{\prime}$, 3rd Edition, equations (14.14) and (14.13) respectively.
(2)
From W.Rindler's $^{\prime}$Relativity-Special, General, and Cosmological$^{\prime}$, 2nd Edition. Equation \eqref{eq04} here is identical to... | {
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"tags": "electromagnetism, electromagnetic-radiation",
"url": null
} |
ros2, robotic-arm, ros-industrial, fanuc
Title: ROS2 Industrial on Physical Hardware I'm trying to use ROS2 to control a Fanuc CRX25ia arm. Following the Industrial Training docs, I got it working in Melodic, which was the latest version of the fanuc driver, and was planning to port my support, moveit, and the releva... | {
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"tags": "ros2, robotic-arm, ros-industrial, fanuc",
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To alleviate the confusion we show an example in R. We construct two 2nd-order polynomials for poly.data.
m1 <- lm(y ~ poly(x, 2), data = poly.data)
m2 <- lm(y ~ x + I(x^2), data = poly.data)
We review the output of both models.
m1
##
## Call:
## lm(formula = y ~ poly(x, 2), data = poly.data)
##
## Coefficients:
## ... | {
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"openwebmath_score": 0.5262314081192017,
"tags": n... |
python, matplotlib, data-visualization
Title: Colored bar plots with confidence intervals I needed to create a bar plot that show:
the mean from some series;
them 95% confidence interval; and,
bars might be colored blue if they are definitely above this value (given the confidence interval), red if they are definit... | {
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"tags": "python, matplotlib, data-visualization",
"url": null
} |
c#, asp.net-mvc-5
In a Controller ActionResult, create a new instance of a custom class that accepts the IEnumerable to be exported along with other string parameters.
var exportIenumerable = new EpplusExcelPackage<ModelToExport>(data.AsEnumerable(),
/* string params for Excel heading */);
byte[] export = exportI... | {
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complexity-theory
Title: Complexity of zero-one loss vs logistic loss functions In Machine Learning: The Basics, Alexander Jung, Spinger, the author states that using the zero-one loss function defined by:$$\mathit{L}((\mathbf{x}, y), h)=
\begin{cases}
1, y \ne \hat{y}\\
0\ otherwise,
\end{cases}\\
(with\ \hat{y}=1\ f... | {
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"tags": "complexity-theory",
"url": null
} |
quantum-mechanics, solid-state-physics, topological-order, topological-field-theory, topological-entropy
Title: Topological phase Can anybody tell me, if generically any system, which is solely described by a topological field theory, resides in a topological phase? I cant find any clear notion of topological phase. O... | {
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"tags": "quantum-mechanics, solid-state-physics, topological-order, topological-field-theory... |
observational-astronomy, telescope, optics, interferometry, angular-resolution
Title: Can the interferometer called "Gravity" measure "a few centimeters on the Moon"? Phys.org's Very Large Telescope sees star dance around supermassive black hole, proves Einstein right links to several ESO videos, including Interview w... | {
"domain": "astronomy.stackexchange",
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"tags": "observational-astronomy, telescope, optics, interferometry, angular-resolution",
... |
1. ## Binomial Expansion
Expanding (2+h)^3
I get 8h+8h^2+2h^3
but...
...What am i doing wrong?
2. ## Re: Binomial Expansion
I can't say how you got it wrong, since all I see is your answer. The stated answer is correct.
The binomial theorem for power 3 is this:
$(a + b)^3 = a^3 + 3 a^2 b + 3 a b^2 + b^3$
To re... | {
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"openwebmath_score": 0.8383194804191589,
"ta... |
navigation, ros2
controller_plugin_types: ["dwb_core::DWBLocalPlanner"]
critics: ["RotateToGoal", "Oscillation", "BaseObstacle", "GoalAlign", "PathAlign", "PathDist", "GoalDist"]
debug_trajectory_details: True
decel_lim_theta: -2
decel_lim_x: -2
decel_lim_y: 0
discretize_by_time: False
goal... | {
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"tags": "navigation, ros2",
"url": null
} |
roslaunch, stere-image-proc
This will help if you do not have hardware triggering/syncing of your image_raw and camera_info topics.
Originally posted by Thomas D with karma: 4347 on 2015-08-28
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by altella on 2015-08-31:
Perfect !!! ... | {
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c#, linq
Based on some condition, I am adding just adding filtering to an existing query and modifying the selected query here. Instead of selecting question_name, I want to select response_label from a data table.
if (criteria.CorporateSummaryExpand == "1")
{
data =
from linq_row in trend_data.AsEnumerable... | {
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optimization, c, synchronization
//Preload counters ...
inline void preload_timer(void) { TMR0H = ...; TMR0L = ...; }
your handling of the RTC values is unsafe. By writing three separate values
from the ISR you guarantee that at some point, application level (ie. non-isr)
code is going to read one of the three value... | {
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"tags": "optimization, c, synchronization",
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kinect, ros-fuerte, ubuntu, ubuntu-precise
Originally posted by georgebrindeiro with karma: 1264 on 2013-01-10
This answer was ACCEPTED on the original site
Post score: 1 | {
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"tags": "kinect, ros-fuerte, ubuntu, ubuntu-precise",
"url": null
} |
quantum-mechanics, harmonic-oscillator
Title: Hermite polynomials and the quantum harmonic oscilator I know that the Hermite differential equation is:
$$y'' − 2x y' + 2ny = 0$$
and the solutions of this differential equations are $H_n(x)$.
However, the quantum harmonic oscillator is of the form:
$$-a y'' +(x^2-\lambda... | {
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"tags": "quantum-mechanics, harmonic-oscillator",
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the probability that we would have observed the measured data if the hypothesis was true. The Theorem. More detailed descriptions of built{in calculator functions are given in the TI{83 Plus Graphing Calculator Guidebook. As a general statement, we can state Baye's theorem as follows\\. my name is Ian ol Azov I'm a gra... | {
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"lm_q2_score": 0.8333246015211008,
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"openwebmath_score": 0.7035920023918152,
"ta... |
Again, the transformed response is a linear combination of the predictors,
$\log(\hat{y}(x)) = \hat{\beta}_0 + \hat{\beta}_1 x = 10.484 + 0.079x.$
But now, if we re-scale the data from a log scale back to the original scale of the data, we now have
$\hat{y}(x) = \exp(\hat{\beta}_0) \exp(\hat{\beta}_1 x) = \exp(10.48... | {
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"lm_q1_score": 0.9817357195106375,
"lm_q1q2_score": 0.8003428500953451,
"lm_q2_score": 0.8152324848629214,
"openwebmath_perplexity": 4317.399344373764,
"openwebmath_score": 0.5933060050010681,
"tags": nu... |
electrostatics, charge, conductors
Please see the details on the bounty The defining property of a conductor is that charge is free to move within it.
Hence, if there existed an electric field within the conducting medium, charge
would move until the field became zero. It follows that $\vec{E} = 0$ inside of a
conduct... | {
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"tags": "electrostatics, charge, conductors",
"url": null
} |
turing-machines, discrete-mathematics, semi-decidability
Loop through all words:
for each word $w$, try every derivation in $G$ of length $2|w|−1$.
If two derivations generate $w$ stop the machine and accept $G$.
There are many ways to loop through all words. For example, we can fix an arbitrary order of all termina... | {
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"tags": "turing-machines, discrete-mathematics, semi-decidability",
"url": null
} |
condensed-matter, solid-state-physics, second-quantization, graphene, tight-binding
I have spent an absurd amount of time trying to calculate this so any recommendations or resources would be greatly appreciated.
The actual low-energy Hamiltonian should be of the following form,
$\Delta_{K + q}- i e^{-i K_x a}\frac{3a... | {
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"tags": "condensed-matter, solid-state-physics, second-quantization, graphene, tight-bindin... |
java, performance, android, formatting
//I'm using arraylists to make it so that I can instance the button.
public ArrayList<Boolean> isPressed = new ArrayList<>();
public ArrayList<Boolean> hasBeenPressed = new ArrayList<>();
public ArrayList<Boolean> isHovering = new ArrayList<>();
public ArrayList<B... | {
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lo.logic, pl.programming-languages, type-theory, proof-assistants, coq
$$
\mathsf{Fmap} : \forall \alpha, \beta.\; (\alpha \to \beta) \to (F(\alpha) \to F(\beta))
$$
See how this corresponds to functoriality? IMO, this would be a very nice option to have in Coq, since it would let you do generic programming much more ... | {
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"url": n... |
c++, c++11, template, coordinate-system
std::cout << euclid_distance(c1, c2) << "\n";
std::cout << euclid_distance(c1, c3) << "\n";
return 0;
}
inch.hpp
#ifndef INCH_HPP_
#define INCH_HPP_
#include "distance.hpp"
struct inch;
template <> double getScaleFactor<inch>()
{
return 0.0254;
}
template <> std::... | {
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"tags": "c++, c++11, template, coordinate-system",
"url": null
} |
rotation, conventions
the fan blowing towards you, hold your right hand in front of you, and curl your fingers so they curl in same direction as the rotation of the blades, your thumb will be pointing towards you. There is nothing physically inherent about this direction: if you reverse the pitch of the blades, you wi... | {
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"tags": "rotation, conventions",
"url": null
} |
c#, framework
Documentation is entirely absent. That makes it even more difficult to tell how this class is meant to be used (or even what its exact purpose is), and various details such as Remove only removing the first matching item are left to the caller to figure out. It also makes it difficult for others to disti... | {
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"openwebmath_score": null,
"tags": "c#, framework",
"url": null
} |
c, tcp, checksum
Title: 16-bit Checksum function in C I was playing with TCP/IP, and came across this 16 bit checksum function:
unsigned short csum(unsigned short *ptr,int nbytes)
{
register long sum;
unsigned short oddbyte;
register short answer;
sum=0;
while(nbytes>1) {
sum+=*ptr++;
... | {
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} |
The probability that you obtain $$14$$ using the $$20$$-sided die on the second role is
$$\frac{10}{20} \cdot \frac{1}{20}$$
The probability you obtain $$14$$ using the $$4$$-sided die on the second role is
$$\frac{3}{20} \cdot \frac{1}{4}$$ | {
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"tag... |
fluid-dynamics, viscosity
Title: Why does the parallel component of the velocity gradient affect viscous force in a fluid? The force density due to viscosity in an incompressible fluid is $-\mu \nabla^2 \mathbf{u}$ where $\mathbf{u}$ is the velocity and $\mu$ is the dynamic viscosity.
Let's suppose some particular sma... | {
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} |
Further we have that: $$\lim_{n\to\infty}\sqrt {\frac{2}{\pi}} \cdot \frac{n}{\sqrt{2n+1}} \le \sum_{n=1}^{\infty} P_{n}$$ that obviously shows us that the series diverges.
Method II
The second way is to resort to the powerful Kummer's Test and firstly proceed with the ratio test: $$\lim_{n\to\infty} \frac{P_{n+1}}{P... | {
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"ta... |
php, pagination
/*
* The 'Last' link
*/
if($this->options['show_links_first_last'] == true)
{
if($this->current_page == $this->total_pages && $this->options['show_links_first_last_if_dead'] == true)
{
$this->links_html .= '<li><span class="'.$th... | {
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"tags": "php, pagination",
"url": null
} |
biodiversity, landscape-ecology
What I do not understand is if this relative abundance relates to all species in a sample, or all found species? | {
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in separate blocks requires a blank line in between blocks. ) 1) psfrag. The GCC style of name mangling, at least for gfortran, is to make the symbol name all lowerc. See also % command used to denote a comment This article is a stub. dvi, which is the file that can be sent to a laserprinter (like valkyr, in Margaret J... | {
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"openwebmath_score": 0.920791745185852,
"tags": nu... |
Mahalanobis Distance. With this measure, the problems of scale and correlation inherent in the Euclidean distance are no longer an issue. Using this weighing scheme with a distance metric, knn would produce better (more relevant) classifications. As can be seen from the figure, in the acid value of soybean model, a sam... | {
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"openwebmath_score": 0.776372492313385,
... |
ros, c++, package, libraries, cmake
Title: How can I create my own ROS C++ library?
Hello All,
This might be a repeat question (although I checked out some of the recommendations that ROS Answers asked me to look at while typing the title of this question, but they didn't seem relevant). Here goes.
So I have a C++ he... | {
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java, android
BTW "https://MyWebsite.com/MyAPI.php/username/password" - passing username and password like this makes me uneasy in terms of security see: https://owasp.org/www-community/vulnerabilities/Information_exposure_through_query_strings_in_url#
Also, I'd strongly recommend using json parsing library instead of... | {
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c#, performance, linq, csv
try
{
string CF1 = values[3];
if (CF1.Length > 50)
{
CF1 = CF1.Substring(0, 50);
}
cl.CF1 = CF1;
}
... | {
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"tags": "c#, performance, linq, csv",
"url": null
} |
np-hardness, tree, hamiltonian-paths
I was not able to find a PTIME divide-and-conquer algorithm, because a distance-$k$ sequence may need to "jump" back and forth, e.g., in this tree if $k$ is 150 and the edges "--100--" have length 100, we need to alternate jumping left and right of the middle element in the followi... | {
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"openwebmath_score": null,
"tags": "np-hardness, tree, hamiltonian-paths",
"url": null
} |
cosmology, astronomy, stars, galaxies, distance
Ly$\alpha$ line center. However, at some redshift the Universe is completely reionized, after which photons bluer than Ly$\alpha$ at this redshift are unaffected and can travel freely. The result is a deep trough of almost zero flux ranging from Lyman$\alpha$ at the reds... | {
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"tags": "cosmology, astronomy, stars, galaxies, distance",
"url": null
} |
general-relativity, conformal-field-theory, klein-gordon-equation
The first term of the equation transforms as:
$$\widetilde\square\widetilde\psi
=e^{(n+2)\omega}\left(
\square\psi
+n\psi\square\omega
+(-D+2n+2)(\partial\omega)(\partial\psi)
+(-D+n+2)n\psi(\partial\omega)^2\right).$$
The term with $\partial\psi$ has t... | {
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"tags": "general-relativity, conformal-field-theory, klein-gordon-equation",
"url": null
... |
quantum-algorithms, entanglement, measurement
Title: Realization of Quantum Shadowgraphy I recently found out about shadowgraphy and was wondering if a technique like this could be used to:
Visually show entanglement
Suffice as a measure (e.g. continous partial trace)
Most useful applications
Resources | {
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"tags": "quantum-algorithms, entanglement, measurement",
"url": null
} |
java, strings, converting
@Override
public String toString() {
return ConvertorToString.buildFor(this)
.withFieldNames("id", "title")
.withFieldValues(id, title)
.toString();
}
} I like the idea of this utility class, but there are a few points I would like to mentio... | {
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"openwebmath_score": null,
"tags": "java, strings, converting",
"url": null
} |
c++, chess
void generateBlockerMasks()
{
for (int square = 0; square < Square::NUMBER_OF_SQUARES; square++)
{
Bitboard squareBitboard(square);
// Calculate the blocker mask for each piece on this square
BISHOP_HASHING_INFORMATION[square].blockerMask = calculateBishopBlockerMask(squareB... | {
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"tags": "c++, chess",
"url": null
} |
organic-chemistry, synthesis, reaction-control
Title: Dimethylene Cyclohexane to Octalin-1,4-Dione | Hydroboration vs. Ozonolysis Pros Cons With regards to the following synthesis, what are some pros and cons of using hydroboration oxidation followed by oxidation of the alcohols compared to ozonolysis.
More specifical... | {
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"tags": "organic-chemistry, synthesis, reaction-control",
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} |
quantum-mechanics, schroedinger-equation
$$\begin{gather}
k_\text{Electron}=\frac{p_\text{Electron}}{\hbar}\\
\omega_\text{Electron}=\frac{E_\text{Electron}}{\hbar}
\end{gather}$$
Given the plane-wave function of an electron, one can then use certain operators to extract momentum and energy from it:
$$\begin{gather}
\... | {
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"tags": "quantum-mechanics, schroedinger-equation",
"url": null
} |
5 sub-branches of this snowflake part turn turtle left 120 degrees loop 5 times:. So this is a recursive algorithm. (Cormen, p. On this post, we are going to learn how to get the big O notation for most recursive algorithms. Programming Concepts: Recursive Techniques. As has already been pointed out, you don't need to ... | {
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"ta... |
For your second question, say, $x$ and $x+1$ has some common factor $d$. Then consider
$$(x+1)-x = 1$$
The left hand side is a multiple of $d$, so the right hand side should also have $d$ as a factor. Then $d$ can only be $1$.
• A Very good and intuitive method. Thanks. – Swapnil Rustagi Dec 2 '14 at 15:06
In gener... | {
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"lm_q2_score": 0.8376199673867852,
"openwebmath_perplexity": 373.65791520038044,
"openwebmath_score": 0.8162268400192261,
"ta... |
photoelectric-effect
Title: Effect of collector plate potential on photoelectric current with varying frequencies?
The above graph is from my physics book which shows the effect of collector plate potential on photoelectric current for different frequencies.
Inference from above graph: | {
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First I would like to fit a sine wave to this data. How to fill an area below sine wave? 3. Of the area shown in the figure determine the area, its 1. All rights reserved. p. You may find it helpful to draw a sketch of the curve for the required range of x-values, in order to see how many separate calculations will be n... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9825575173068325,
"lm_q1q2_score": 0.8250869244446827,
"lm_q2_score": 0.8397339696776499,
"openwebmath_perplexity": 349.75428318802983,
"openwebmath_score": 0.8734630346298218,
... |
homework-and-exercises, newtonian-mechanics, energy, work
However, it is much easier to get to this result by, instead of using an energy balance, constructing the momentum balance, $$m v_0 = (M + m) v,$$which gives you that particular result directly without having to do any of this hard work. | {
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In the second case we deal with a union of disjoint events so the probability can be calculated as$$\Pr(A\cap B\cap T^c)+\Pr(A\cap B^c\cap T)+\Pr(A^c\cap B\cap T)+\Pr(A\cap B\cap T)$$
• Thanks, this is how I ended up doing it. (A∩B)-(A∩B∩T)+(A∩T)-(A∩B∩T)+(B∩T)-(A∩B∩T)+(A∩B∩T). I just realized the last minus (A∩B∩T) wa... | {
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"lm_q2_score": 0.8397339736884711,
"openwebmath_perplexity": 370.52564842781663,
"openwebmath_score": 0.7746531367301941,
"ta... |
diagram of A and B looks something like this: Here are some examples of set operations and their Venn Diagrams: A∪B A∩B A∪B (A∪B) A three-set Venn diagram looks. DIFFERENCE OF SETS. A = { set of even numbers between 0 and 10} 02. Select number of sets and update the venn diagram parameters Venn diagram maker tool is co... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9755769042651874,
"lm_q1q2_score": 0.8576752802971456,
"lm_q2_score": 0.8791467659263148,
"openwebmath_perplexity": 789.4183828942959,
"openwebmath_score": 0.4094984829425812,
"tags": nul... |
vba, error-handling
If vbYes = MsgBox("4. Do you want to raise an error in the ELSE error handler when CatchBlock1_ErrorElse HAS been used? - (PRESS CTRL+BREAK now then try both YES and NO )", vbYesNo) Then
i = 100 / 0
End If
CatchBlock1_ErrorElse:
On Error GoTo HandleError... | {
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} |
homework-and-exercises, charge, potential, capacitance, voltage
Title: Electric potential and voltage A capacitor is connected to a battery with constant voltage. If you approach one of the plate to the other, what happens to electric potential?
I already have an answer to this question but it's different from what my... | {
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• Stefan might be saying this more rigorously (too lazy to figure it out), but: this solution is like assigning to $\mathbb R$ the topology obtained by identifying it with a subspace of $\mathbb R^2$ given by a circle and a tail. The fact that a 1-1 continuous path from $\mathbb R$ onto such a figure should be pretty i... | {
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"lm_q1_score": 0.9861513869353992,
"lm_q1q2_score": 0.8281048188543829,
"lm_q2_score": 0.8397339696776499,
"openwebmath_perplexity": 170.19009498565248,
"openwebmath_score": 0.9498045444488525,
"ta... |
python, dataframe
The first one is simple, it takes a dataframe and the name of a column, and it will extract the column into a new dataframe.
def extract_col_as_df(df, column_name):
data = [datum[0] for datum in df[column_name]]
df = pd.DataFrame(data = data)
return df
df_astronomy = extract_col_as_df(d... | {
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"openwebmath_score": null,
"tags": "python, dataframe",
"url": null
} |
autodesk-inventor
Title: How do I extrude a region in autodesk inventor? I'm a beginner at autodesk inventor.
For some instances when I click a region to extrude it doesn't come alone.
The screenshot below illustrates something even stranger.
What should I do to make this not to happen? In a sketch, you cannot have... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "autodesk-inventor",
"url": null
} |
organic-chemistry, aromatic-compounds, synthesis
Title: How to develop a retrosynthesis plan for 2-[(E)-2-(3-bromophenyl)ethenyl]-1,3-benzoxazole? I need to retro-synthetically design a valid synthesis plan (in two steps, from cheap starting materials available over at Sigma Aldrich) for a target compound, pictured be... | {
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"tags": "organic-chemistry, aromatic-compounds, synthesis",
"url": null
} |
and convergence and divergence of power series. We say that $3$ is the radius of convergence, and we now say that the series is centered at $-2$. Hence the interval of convergence is. For the finite sums series calculator computes the answer quite literally, so if there is a necessity to obtain a short expression we re... | {
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"lm_q2_score": 0.8152324938410784,
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"openwebmath_score": 0.9233711957931519,
... |
homework-and-exercises, rotational-dynamics, moment-of-inertia
---------------------EDIT:--------------------
You did not mention before your edit that the moment of inertia about the center of mass was given.
You seem to be having a problem with the expression of kinetic energy of a rotating body. The total kinetic ... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, rotational-dynamics, moment-of-inertia",
"url": null
} |
performance, console, assembly, memory-optimization, text-editor
Title: Rich Edit Form Input (x86-16)
This procedure is the natural continuation of the Example 4 that I wrote for
How buffered input works, a Stack Overflow Q/A.
Features include:
freely positioning the cursor.
Left Moves cursor left.
Right Moves cur... | {
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"tags": "performance, console, assembly, memory-optimization, text-editor",
"url": nul... |
planet
What is the density profile within the Sun's photosphere? Which one of these is wrong?
At what depth below the Sun's surface does the density reach that of water?
Do stars have "radio photospheres"? Are they different from their optical photospheres?
Do neutron stars have something like a gamma-ray photosphere?... | {
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"id": 6902,
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"url": null
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3. 5 Derivatives and the Shape of a Graph. Related Rates 1: (dA)/dt = 2 \pi r (dr)/dt Worksheet #35: W s #35 Solutions: 1-6, 7-10, 12 review: Related Rates 2: dz/dt = x dx/dt + y dy/dt Worksheet #36: Implicit Differentiation; Implicit Differentiation – Basic Idea and Examples ; Implicit Differentiation …. Limits: An In... | {
"domain": "wm-20-10.de",
"id": null,
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"lm_q1_score": 0.9763105245649665,
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"lm_q2_score": 0.8705972633721708,
"openwebmath_perplexity": 860.0567509387288,
"openwebmath_score": 0.7438331246376038,
"tags": nu... |
fft, convolution, autocorrelation, reference-request, fast-convolution
The second method does not double the length and so will alias the signal. Maybe it is correcting for the aliasing. But also there are different definitions of autocorrelation see and may also be calculating the statistical autocorrelation assuming... | {
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"tags": "fft, convolution, autocorrelation, reference-request, fast-convolution",
"url": null
... |
and the convergents for $251/11$, here explicitly: $$\frac{251}{11} =22+\frac9{11} =22+\frac1{11/9} =22+\frac1{1+\frac 29} =22+\frac1{1+\frac 1{9/2}} =22+\frac1{1+\frac 1{4+\frac12}} =[22;1,4,2] \ .$$ (This is a systematic way to use the repeated euclidean algorithm in one relation.) The "convergents" are fractions tha... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9793540686581883,
"lm_q1q2_score": 0.8139833194126617,
"lm_q2_score": 0.8311430415844385,
"openwebmath_perplexity": 282.3476697558281,
"openwebmath_score": 0.8808892965316772,
"tag... |
According to the FBD that the book has drawn is it not that that the book is finding the coefficient of friction b/w man and the platform not b/w platform and incline.
6. Sep 9, 2016
### haruspex
You are right, so it turns out that the error in the book is that it should have asked for the minimum static friction, n... | {
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"openwebmath_perplexity": 509.4813723646286,
"openwebmath_score": 0.8194578289985657,
"tag... |
c++, performance, factors
for (int i = 2; i <= sqrt_n; i++) {
if (n % i == 0) {
// `i` and `n / i` are divisors of `n`.
count += i;
if (i != n / i) {
count += n / i;
}
}
}
return count;
} | {
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"openwebmath_score": null,
"tags": "c++, performance, factors",
"url": null
} |
general-relativity, differential-geometry, terminology, geodesics
Title: How can an affine geodesic exist on a curved manifold? I'm reading Inverno's "Introducing Einstein's Relativity". I think I understand how the author derives the affine geodesic equation. He considers the tangent vector to any curve as the vector... | {
"domain": "physics.stackexchange",
"id": 49031,
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"tags": "general-relativity, differential-geometry, terminology, geodesics",
"url": null
... |
python, scikit-learn, feature-selection, linear-regression, features
Code
from sklearn.datasets import make_regression
from sklearn.linear_model import LinearRegression
from matplotlib import pyplot
from numpy import loadtxt
# define dataset
x = loadtxt('formatted_data_x.txt')
y = loadtxt('formatted_data_y.txt')
# de... | {
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"tags": "python, scikit-learn, feature-selection, linear-regression, features",
"url":... |
everyday-chemistry, hydrocarbons, temperature, viscosity, mechanical-properties
Title: Does motor oil get more viscous when heated & what is the meaning of the SAE motor oil code? The motor oil in my 2004 Pontiac Vibe is 5W-30.
My (incorrect) understanding of this SAE nomenclature is that 5W means "Viscosity index of... | {
"domain": "chemistry.stackexchange",
"id": 15659,
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"tags": "everyday-chemistry, hydrocarbons, temperature, viscosity, mechanical-properties"... |
signal-detection, software-defined-radio, frequency-modulation
Filtering Now, the design of that filter (1.) might be rather simplistic: I'll take an arbitrary real-valued low-pass filter with a cutoff frequency of 80 kHz; that will let through the 160 kHz between -80 kHz and +80 kHz around its center frequency.
Magni... | {
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"tags": "signal-detection, software-defined-radio, frequency-modulation",
"url": null
} |
When an input voltage v(t)v(t) size 12{v $$t$$ } {} is applied to the system, the circuit current i(t)i(t) size 12{i $$t$$ } {} can be obtained by computing the convolution integral.
Figure 17 shows the block diagram of this linear system and Figure 18 the corresponding front panel. From the front panel, one can contr... | {
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"openwebmath_score": 0.6266806721687317,
"tags": null,
... |
Hint If $\,q(n)\,$ is prime for all $\,n\,$ then $\,q(0) = p\,$ is prime, thus $\, p\mid q(pn)\,$ and $\,q(pn)\,$ is prime, hence $\,q(pn) = p\,$ for all $\,n.\,$ Thus the polynomial $\,q(px)-p\,$ has infinitely many roots so is zero, i.e. $\,q(px) = p\,$ is constant, hence $\,q(x)\,$ is constant.
• "If q(n) is prime... | {
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"lm_q2_score": 0.8479677602988602,
"openwebmath_perplexity": 303.43717121024696,
"openwebmath_score": 0.8195440769195557,
"ta... |
graphs, reference-request, minimum-cuts
The problem is defined as follows. Given an undirected graph $G = (V, E)$ and two integers $k$ and $\ell$, is it possible to delete at most $k$ edges from $G$ such that in the resulting graph, each connected component has at most $\ell$ vertices.
The problem is related to the v... | {
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"tags": "graphs, reference-request, minimum-cuts",
"url": null
} |
gnuradio, pll
Regards,
M. Before I address your questions, you should understand:
a. the integral branch of the loop filter maintains a average phase increment in units of radians/sample. It is not a frequency value, though in the right context it can be converted to a frequency value, using your sample rate as a co... | {
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"tags": "gnuradio, pll",
"url": null
} |
scikit-learn, cross-validation, machine-learning-model
This is a heuristic(!) based on Occam's razor that simpler models tend to generalize better. However, keep in mind that for complicated problems simpler models are probably just that: simpler. They don't have to be more accurate.
Alternatively, instead of 3. you ... | {
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"tags": "scikit-learn, cross-validation, machine-learning-model",
"url": null
} |
# Meaning of linear independence with row vectors
So far I have understood that a set of vectors $$S = {v_1, v_2, . . . , v_k }$$ in a vector space V is linearly independent when the vector equation $$c_1v_1 + c_2v_2 + . . . + c_kv_k = 0$$ has only the trivial solution$$c_1 = 0, c_2 = 0, . . . , c_k = 0.$$
An example... | {
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"lm_q2_score": 0.8175744806385543,
"openwebmath_perplexity": 200.91178349730984,
"openwebmath_score": 0.876210629940033,
"tag... |
supersymmetry, group-theory, lattice-model, poincare-symmetry
According to this answer, the supersymmetry Lie supergroup $G$ corresponding to 3+1D SUSY with $N$ fermionic generators and no additional internal symmetries is Inonu-Wigner contracted $OSP(4/N)$. Does there exist a Hamiltonian, defined on a lattice with s... | {
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"id": 96421,
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"openwebmath_score": null,
"tags": "supersymmetry, group-theory, lattice-model, poincare-symmetry",
"url": null
} |
meteorology, models, weather-forecasting
I know that "chance of rain" is a very specific example, but I am interested more generally where randomness is used in common weather models. E.g. "this model uses the normal distribution to estimate this quantity" etc. Specific information is especially appreciated, e.g. name... | {
"domain": "earthscience.stackexchange",
"id": 2062,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "meteorology, models, weather-forecasting",
"url": null
} |
formal-languages, context-free, formal-grammars, proof-techniques
$$
and now we're stuck, since no production will give us the ) terminal we need on the left without introducing a ( first.
For a slightly different take, consider that $S$ can only derive strings in $D_2$, so to derive ( ] ) ] we must use the producti... | {
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"id": 3485,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "formal-languages, context-free, formal-grammars, proof-techniques",
"url": null
} |
descriptive-statistics, information-theory, mutual-information
Part mutual information: This new measure is based on information theory that accurately quantify nonlinearly direct associations between measured variables. For more information, part mutual information for quantifying direct associations
Calculate mutual... | {
"domain": "datascience.stackexchange",
"id": 9822,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "descriptive-statistics, information-theory, mutual-information",
"url": null
... |
gravity, black-holes, space, celestial-mechanics
It is my opinion that there is still uncertainty regarding the emission of highly spinning black holes, because there is no certainty about what happens to infalling matter. One has reasons to suspect that this matter is emitted from the black hole nonthermally, more or... | {
"domain": "physics.stackexchange",
"id": 4473,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "gravity, black-holes, space, celestial-mechanics",
"url": null
} |
performance, vba, excel, hash-map
Debug.Print Timer - start & " Open client database, determine which account we're on"
''--------------------------------------
''Find Last 4 Dates & Column Header for Orders
''--------------------------------------
Dim dateStart As Long
Dim stationStart As Long
Dim stationEnd As Long
... | {
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"tags": "performance, vba, excel, hash-map",
"url": null
} |
c#, wpf, sqlite
// and so on
// and so on
// and so on
...are all the cells that I bound my SQL View to.
Now, to fill the DataGrid:
public void LoadView()
{
try
{
SQLiteCommand command = new SQLiteCommand(connection);
command.CommandText = MyApk.Properties.Resources.user_datagrid;
... | {
"domain": "codereview.stackexchange",
"id": 15255,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, wpf, sqlite",
"url": null
} |
fluid-dynamics, conventions, flow
Title: Flow term in Reynolds transport theorem The basic form of Reynolds transport theorem for a fixed control volume can be written as
$$\frac{D B_{sys}}{Dt}=\frac{\partial B_{CV}}{\partial t}-\dot{B_{in}}+\dot{B_{out}}$$
Why is the $\dot{B_{in}}$ term negative and the $\dot{B_{out... | {
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"openwebmath_score": null,
"tags": "fluid-dynamics, conventions, flow",
"url": null
} |
aerodynamics, drafting
Title: What shape does a rod bend into when you push the ends together? If I have a uniform rod --
And then I push on each end toward the center >--<
So it bends >^<
What shape does it make? Is it a parabola, a catenary, or something else?
Assume constant stiffness along the rod. I'm using the r... | {
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"openwebmath_score": null,
"tags": "aerodynamics, drafting",
"url": null
} |
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