All Questions
84,303
questions
1
vote
0
answers
19
views
How can I remove plot markers at some desired points?
How can I remove plot markers at some data points?
For example, I want to remove plot markers at these circled points leaving only one marker at each point there. I tried deleting the data points ...
- 1,810
3
votes
2
answers
62
views
Solving a Simple 'Sum and Product' Problem
I am trying to solve a simple 'sum and product' problem. Basically, the sum of four prices and the product of those four prices are numerically equal (you must, of course, disregard the units). The ...
- 31
0
votes
0
answers
22
views
Meshing Error on Imported obj file
I am trying to import a .obj file to be used in a static electric field simulation. I am able to successfully run the simulation with certain other aperture geometries (see here: < https://www....
- 23
0
votes
0
answers
28
views
How to mix two styles with some lines with filled and non-filled markers?
How can I mix styles with some lines with filled and non-filled markers? The post here mentioned all cases but I couldn't combine them into one plot.
...
- 1,810
-1
votes
1
answer
29
views
How to apply the style of one set of data to another set of data?
I have a data set that must be plotted using BarChart, and I would like to format the color based on another dataset's style. For Example:
...
- 4,368
1
vote
2
answers
30
views
Multiple columns from a single column of data file
Suppose I have a data file containing one column of 1000 rows having x, y, z and ϕ values. I need to separate them into four distinct columns by selecting every alternative value.
For example, if I ...
- 439
0
votes
0
answers
22
views
Solving a 2d recurrence diagnoal-by-diagnoal
I have a 3d recurrence relation -- which I know can be hard for Mathematica to work with, so that I boiled it down to 2d:
We have two functions, $f_1(i,j)$, $f_2(i,j)$ defined on the state space $\{(i,...
- 165
2
votes
2
answers
56
views
ComplexExpand no longer assumes Derivative[__][__][__] as real
Consider the following sample:
{Re, Im}[u'[t]] // Through // ComplexExpand
In v9.0.1 u'[t] is assumed as real:
But at least ...
- 52.3k
7
votes
1
answer
71
views
protein visualization: display a residue in balls and sticks over the structure
I am trying to visualize a cytochrome c protein and display one of the residues in ball and sticks over it.
I am using the PDB file 1AKK for it (https://www.rcsb.org/structure/1akk). The Import ...
- 93
0
votes
0
answers
21
views
Edit UnicodeCharacters.tr-File
I want to install a new package in Mathematica. If I understand the userguide right, I also have to edit the UnicodeCharacters.tr-File by another *.tr-File for example containing
0x2219 [...
- 1
0
votes
0
answers
22
views
Problem with a DAE and DiscreteVariables (II)
I continue with a DAE problem similar to another one posted here some days ago. @bbgodfrey offered a solution for the DiscreteVariables problem but now I have a different problem.
Equations I put came ...
- 111
4
votes
4
answers
96
views
How to plot smooth region based on data?
Consider some region region, chosen for simplicity as a parallelepiped:
...
- 3,822
5
votes
0
answers
66
views
Coarse mesh of a sphere
I try to mesh a sphere (examplary) in different qualities, using MaxCellMeasure:
...
- 37k
0
votes
0
answers
31
views
How to replace functions with their Fourier transform
I have a function \deltaG given by
...
4
votes
2
answers
99
views
Finding Mesh Cell Normals
I need to find a normal pointing outside for every face / cell of a closed Mesh Region.
How can I do this?
Here's what I have now - mesh + mesh cells centers and I'm stuck and puzzled.
There's ...
- 43
0
votes
0
answers
38
views
Very weird behaviour with AbsoluteTiming[] - any explanation?
So I've stumbled upon something with AbsoluteTiming and computing speed in general which left me dumbfounded. It's the following:
If I run this code (where someOperation is a simple straightforward ...
- 285
1
vote
1
answer
40
views
How to select in the following way?
Consider the following nested list:
fff = {{1, 2, {{1, 2}, {3, 4}, {19, 20}, {21, 22}}}, {2,
8, {{0.5, 3}, {1.4, 2}, {3, 13}, {2, 18}, {0.3, 19}, {20, 21}}}}
...
- 3,822
5
votes
2
answers
206
views
How to speed up loading 20k lines tsv-file with complex numbers?
I have a long (20k lines) file which looks like this:
...
- 898
0
votes
0
answers
41
views
Simulating the Response of Charged Particles to Apertures with Inhomogeneous Electric Fields Passing through them
I have produced a simulation which allows me to observe a static electric field produced by a charged plate as it passes through some complex apertures in a different, oppositely charged metal plate.
...
- 23
0
votes
0
answers
61
views
0
votes
0
answers
41
views
How to define a function that variable with subscript and then plot graphics？ [closed]
How to define a function that variable with subscript and then plot graphics? For example, $\lambda a_H^2 + (1-\lambda)a_L^2$.
But it's has some error:
...
1
vote
0
answers
31
views
0
votes
0
answers
32
views
Is the integration feature of an interpolated plot/function supposed to have a much larger maximum and range values in general?
So, I have imported data from a software called NextNano, plotting electron density. My first step was to define the data within the desired domain data={,},.... ...
7
votes
8
answers
274
views
How to replace anti diagonal elements of a matrix
I want to assign new values to the anti-diagonal elements of a square matrix m with the values of its diagonal elements. For that, I want to make use of ...
- 309
6
votes
1
answer
83
views
Does converting large 3D matrices to VERY large 2D matrices affect speed of operations done on the matix?
Novice question! Does the dimensionality of a matrix affect the speed of operations performed on it (or the speed of retrieval of values from it) IF the total number of elements in the matrices are ...
- 185
0
votes
0
answers
32
views
What is the closest equivalent to SynthesizeMissingValues in Python? [closed]
I need to re-implement a few examples in Python, probably with sklearn.
What (sub)package or functionality is the closest to these two symbols ...
- 3,669
1
vote
0
answers
42
views
In Windows Classic theme the buttons on toolbars have no borders
This is under Mathematica 13.0 and Windows 11:
In Preferences, the situation is even worse:
Since all those windows are Mathematica notebooks, maybe it is possible to fix them?
- 2,751
0
votes
0
answers
41
views
How to Combine 3d Plots
I am trying to analyze data from a high-altitude balloon (HAB) launched in Ohio, and I would like to use Mathematica to do this. Currently, I have used Mathematica to generate a plot of the topography ...
2
votes
1
answer
70
views
A complicated derivative problem
I have some equation，like this
$$
\begin{aligned}
&\hat{t}_{g o}=\frac{R}{V_{m}}\left(1+\frac{(n+2) \sigma^{2}+(n+1)^{2}(n+2) \sigma_{f}^{2}}{2(2 n+3)(2 n+5)}-\frac{(n+1) \sigma \sigma_{f}}{2(2 n+...
- 405
4
votes
2
answers
224
views
How can I move these numbers to the right side of the y axis?
How can I move these numbers to the right side of the y axis?
(preferably not using frame)
Plot[1 + x^2, {x, -5, 0}]
Here is my orginal problem. I tried my best ...
- 1,810
2
votes
1
answer
63
views
How to import the given file?
Consider a file with the following block structure:
Event XX Muon YY:
data
End of event
Event XX' Muon YY':
data'
End of Event
...
where ...
- 3,822
3
votes
3
answers
235
views
1
vote
2
answers
98
views
Solution on nonlinear pde with intial condtion
It produces an error. please suggest an alternative solution to the above-coupled pde problem.
...
- 31
7
votes
1
answer
102
views
Using Compile on Gradient within FindMinimum efficiently
This is an example from the documentation:
...
- 2,160
1
vote
3
answers
98
views
Solution at a particular point
I have an equation
y[a, b, x] = a^2 b x^-2 (Exp[b/x] - 1)^-1
and when I plot, it gives the expected curve as shown in the image attached.
I need to find the value ...
- 85
2
votes
2
answers
145
views
How to plot two functions?
a[x_,y_]:=x^3+y^2;
b[x_,y_]:=x^2+y^3;
I want to plot a[x,y] in x axis and b[x,y] in y axis for different values of x and y say, we fix y=1 and x goes from 1 to 10.
- 115
0
votes
1
answer
40
views
Real valued solution
I want to obtain the critical points or if you like a real solution for the first derivative of the function set to zero, and the second derivative also vanishes of the function :
...
2
votes
1
answer
68
views
Can BarLegend Tricks be set according to the function?
I am using it like this . Now how to set barlegend numbers according to the c[x] value?
...
- 115
6
votes
1
answer
90
views
Exporting results containing Entities to JSON?
I am looking for a straightforward way to export results from functions like ImageContents, FacialFeatures, and WolframAlpha - symbols that return stuff containing knowledgebase content.
Aside from ...
- 30.4k
0
votes
0
answers
13
views
how to find the CDF of double truncated exponetial distribution [duplicate]
tring to find the cdf of double truncated exponetial distribution using the follwing code
...
0
votes
1
answer
53
views
Add barlegend colored by area of circle
I am using the following code where color and color barlegend show the radius of the concentric circles:
...
- 115
6
votes
0
answers
48
views
How can I gracefully stop loading a package based on Mathematica version number?
I recently shared some work with a colleague and realized that his having v12 caused issues, as I used some new-to-13 functions.
How can I put a requirement for a minimum version into my package?
Here'...
- 5,414
1
vote
2
answers
65
views
Defining Dirichlet Boundary Conditions on an Imported 3D Object with Apertures in it
I am trying to simulate a static electric field (in 2d and 3d) as it passes through a couple of apertures in a 3D "metal sheet" (model imported as a .obj file) given here:
https://www....
- 23
-3
votes
0
answers
44
views
prime and integers [closed]
The sum of the squares of the prime numbers from 1 to 200
Print those that are exactly divisible by 7.
Note: Use one of the Do, For, While commands for the solution. count yourself
You can use the ...
8
votes
0
answers
95
views
Kernel crash with RandomChoice
Bug introduced in 8.0.4 and persisting through 13.0.1 or later (case: 4948255)
I use Mathematica 12.3.1 for Microsoft Windows (64 bit). While playing with some code inspired by this recent question, ...
- 60.1k
2
votes
0
answers
33
views
Converting between mean time between failures and survival probabilities
This is more of a math question, but I'm hoping some math wizard can help me map these concepts to functions in Mathematica's reliability API.
$f$ of my machines will experience a failure in the first ...
- 5,699
2
votes
0
answers
32
views
Help understanding a bug when FoldList using RandomChoice is Compiled
Preamble: I submitted this bug to support@wolfram.com and it was acknowledged. I assume it will be fixed eventually. In the meantime I'd like to understand what's going on so I can have a better idea ...
- 1,397
0
votes
0
answers
40
views
How to transform this MeijerG function into a modified Bessel function $K_n(z)$
I have this MeijerG function
$$f(n,z)=\frac{z^2 \Gamma \left(n+\frac{3}{2}\right)}{2 \sqrt{\pi } K_2(z)}G_{1,3}^{3,0}\left(\frac{z^2}{4}|
\begin{array}{c}
n \\
-\...
- 601
2
votes
1
answer
36
views
Strange Vertex Size Problem when Moving From 999 to 1000 Verteces
I have a problem with Graph plot scaling of vertex sizes when I go from 999 vertices to 1000 vertices. The following code scales the vertex size properly when the numNodes = 999; but not numNodes = ...
2
votes
1
answer
126
views