All Questions
93,887
questions
3
votes
1
answer
58
views
Checkbox alternating between first and third state of appearance
When clicking on the first checkbox its appearance alternate between first and second states.
When clicking on any of the three checkboxes in the row they alternate between three states of appearance.
...
- 24.7k
2
votes
0
answers
28
views
CreateDialog and GraphicsArray
I think I have hit on a true bug in the Mathematica Front End:
If I define
plotFunc[] := Print[GraphicsGrid[{{Plot[x^2, {x, 0, 1}], Plot[x^3, {x, 0, 1}]}}]];
I can ...
- 141
1
vote
0
answers
27
views
Changing mouse over grid behavior
How to achieve that mouse over Grid is always an arrow like we see on first image (when mouse is over an item of the grid) and never the the shape we see in the ...
- 16.7k
5
votes
2
answers
112
views
Converting between currencies using a pair of currency codes
Mathematica can convert currencies using real time data:
CurrencyConvert[Quantity[13.25, "USDollars"], "Euros"]
which gives
€10.8
Can I do ...
- 24.7k
1
vote
1
answer
53
views
Defining a symbolic block matrix
I'm a total beginner in Mathematica and I have been struggling with defining the following symbolic matrix with entries in $\mathbb{Z}_2$
Here, $\mathbb{1}_{m_i}$ and $\mathbb{0}_{m_i}$ stand for the ...
- 51.7k
0
votes
0
answers
37
views
Manipulate not showing despite Plot working fine
Heyhey I am trying to solve a differential equation for the time evolution of a probability distribution. It solves just fine using NDSolveValue and I am able to plot the solution for specific times, ...
- 115
2
votes
1
answer
69
views
Find disjoint subsets and their union is {1...9}
I have such a list
sets = Select[IntegerDigits /@ (Range[Floor@Sqrt@987654321]^2),
DuplicateFreeQ@# && FreeQ[#, 0] &]
I want to pick all subsets of ...
- 16.7k
6
votes
1
answer
141
views
How do I couple an 1D PDE to a 2D Laplace equation?
Recently I've come across the following system governing the spreading of an evaporating droplet. The height of the droplet $h$ is defined by the following equation
$$\frac{\partial h}{\partial t}=-\...
- 44.5k
9
votes
1
answer
280
views
Schrödinger equation for the Morse potential (DEigensystem)
I have tried to solve the Schrödinger equation for the Morse potential using Mathematica. I am using Mathematica 12, and I have written the following code:
...
- 47.5k
0
votes
0
answers
40
views
How to make the AxisLabel move in a 3D plot [duplicate]
I have a question related to the 3DPlot Labels.
I have this way to make a plot and I will want the plot to have rearranging labels when I rotate the plot around to maybe get a better view of it:
...
0
votes
0
answers
68
views
ContourIntegrate not works [closed]
https://reference.wolfram.com/language/ref/ContourIntegrate.html
ContourIntegrate[1/z, z [Element] Circle[]]
Out[174]=ContourIntegrate[1/z, z [Element] Circle[{0, 0}]]
Why doesn't Contourintegrate ...
- 183
0
votes
0
answers
33
views
How to symbolize code for ladder operators
As suggested in this answer, I am considering symbolizing the function "NonCommutativeMultiplyNew" from the following code:
...
- 870
9
votes
3
answers
1k
views
Taxicab Geometry
According to taxicab geometry, there are 1226 possible paths from A(2,5) to B(7,9), all with a distance of 9 units, |2-7|+|9-5|=9. I wanted to write a code where I could be obtaining the plots of some ...
- 5,215
8
votes
5
answers
513
views
Using DeleteCases to delete vectors with particular index as 0
Assume I have a set of vectors
set = {{0,1,1,0,1}, {1,0,1,1,1}, {1,1,1,1,0},{1,0,0,1,0}}.
I want to delete the vectors which have the last entry as 0. In the ...
- 26.3k
8
votes
6
answers
297
views
Split matrix by all-zero columns
Below is my input:
mat = {{0, 0, 0, 0, 0, 1}, {1, 0, 0, 1, 0, 1}, {0, 1, 0, 0, 0, 0}, {0,
0, 0, 0, 0, 1}, {1, 1, 0, 1, 0, 0}, {0, 0, 0, 1, 0, 1}};
$\quad\...
- 53.6k
0
votes
1
answer
33
views
Preserving the font size in exporting images
I am trying to make a video by generating many images of a process, exporting them to the disk by the Export command in the PNG format, and finally making a video with FFmpeg.
My images have a title ...
0
votes
1
answer
48
views
Trying to use NIntegrate and my code works intermittently - Throws one error consistently, but only gives me a partial result [closed]
I'm trying to do some calculations/simulations of pulse autocorrelations of non-integer orders and when I try to use NIntegrate it only works intermittently, and when it does work it only gives me a ...
- 8,606
5
votes
2
answers
91
views
How to most responsively manipulate time intervals in ParametricPlot?
I often met with the case where I want to show the past trajectory of a object. A way of demonstrating this is to plot the trajectory using ParametricPlot, and then ...
- 236k
10
votes
7
answers
2k
views
Filtering elements from a list
Suppose that I have a list
{{{2, 1}, {4, 3}, {2, 4}}, {{2, 1}, {4, 3}, {3, 1}},
{{2, 1}, {2, 4}, {3, 1}}, {{4, 3}, {2, 4}, {1, 2}}}
I want to make a new list ...
- 69.5k
2
votes
5
answers
589
views
Delete sublists containing strings
I have a list with several sublists containing either strings or integers. I'd like to delete all lists with strings.
The following list:
...
- 69.5k
11
votes
6
answers
599
views
How to replace selected elements of a list of rules with another unbalanced list of rules
I have two lists of rules:
...
- 69.5k
8
votes
5
answers
637
views
Colorbar to illustrate the change of a specific parameter
I have plotted a sine function where the period is varied. I have included my code below.
...
- 69.5k
1
vote
2
answers
77
views
How to change the sampling period of discrete time model?
Mathematica Version 14.0 on Win 10.
This is a problem I am having with a much more complicated notebook. I crafted the simple example below for this question.
If I begin with an expression in the s-...
- 4,387
4
votes
1
answer
283
views
How do you ask someone to input the values of a matrix?
I'm trying to set up code that basically asks the user to input the values of a matrix with a certain key size. I want them to first enter the keysize and then ask for all of the entries necessary to ...
CommunityBot
- 1
1
vote
1
answer
90
views
What's the difference between FourierSinCoefficient and FourierSinSeries in in terms of results?
Let's assume having defined a sawtooth:
saw[t_] := 2*(SawtoothWave[t + 0.5] - 0.5)
Now, we'd like to compute sine fourier coefficients for that sawtooth. We may do ...
- 16.7k
1
vote
1
answer
97
views
How to quickly sample from the following distributions
Consider the following distributions:
...
- 158k
2
votes
0
answers
31
views
How can I have a dynamic number of InputForms that grows as I add to it?
I'm trying to write a program where it starts with one input field, and if I fill out that input field, then another input field gets added below the first one and if I fill that one out another ...
- 81
0
votes
1
answer
63
views
Simplification of quantum ladder operators (ideally using Using NCAlgebra)
I want to do math that involves a series of ladder operators. In the past I've tried to get it working with a 20 year old Mathematica package. But my feeling is that this is a very unused package and ...
- 59k
0
votes
1
answer
85
views
Error on RecurrenceTable with two variables [closed]
I am trying to simulate a second order filter unit step response with the RecurrenceTable instruction in Mathematica. There's a problem with the second-order ...
- 26.3k
4
votes
2
answers
108
views
Questions About the FunctionExpand Function
Today, while helping someone solve a problem, I encountered an issue with the Abs function in their expression. I needed to derive the ...
- 158k
3
votes
1
answer
87
views
How to Convert WLSymbolFactory to Python String?
I'm trying to simulate with python and Mathematica, Python need to generate and save some pictures to the directory of current mma notebook, I know the function that ...
- 26.3k
3
votes
1
answer
65
views
Interpretation function not working properly with Graphics [closed]
The Interpretation function does not seem to be working properly with Graphics on my computer (MacOS 14.2.1, Mathematica 14.0.0.0). Instead of returning what it should be interpreted as, it returns ...
- 24.7k
-1
votes
0
answers
30
views
Higher moments dominated by mean and variance [closed]
Let {$X_{k}$} be i.i.d variables, $\mathbb{E}(X_{k})=0$,$Var(X_k)=1$. Fix $u > 0$, denote $\widetilde{X}_{k}=X_{k}\mathbb{I}_{|X_{k}|>u}-m(u)$, where $m(u)=\mathbb{E}(X_{k}\mathbb{I}_{|X_{k}|>...
0
votes
0
answers
34
views
Ising Model Simulation Increase Efficiency
I implemented a 2d simulation of Ising Model for zero external magnetic field. Below you can find the function I wrote to calculate the energy (periodic conditions)
...
2
votes
2
answers
665
views
Set of flat curves with filling in 3D plot
I'm trying to draw 3D plot from my experimental points in the way shown at the figure below:
I tried to use ListPointPlot3D for that, but obviously there is no option Joined as in ListPlot.
...
- 53.6k
0
votes
0
answers
16
views
ParallelTable: an unknown box name (TerminatedEvaluation) was sent as the box form for the expression [duplicate]
This seems to be a bug?
The example code for MMA v.13.0 is:
...
- 347
1
vote
2
answers
80
views
How to find number of integral solutions of the equation $\log _3(x+3 y)+x^2+3 y^2+4 x y-x-y=0$?
I am trying to find number of integral solutions of the equation $\log _3(x+3 y)+x^2+3 y^2+4 x y-x-y=0$ here $x$, $y$ are integer number $x\in [-2024, 2024]$ and $x + y >0$. I tried
...
- 26.3k
2
votes
1
answer
76
views
NIntegrate underestimate the area under the graph [closed]
I want to find the area under this graph,
I used NIntegrate for this purpose and here is my script,
...
- 3,342
6
votes
4
answers
838
views
LabelingFunction won't show all the labels
I am trying to plot a ListPlot where each point has a label. Unfortunately Mathematica seems to decide that is a label is too large, it will not show it. I would ...
- 69.5k
0
votes
0
answers
34
views
(xAct) AllContractions with sum of terms
I'm doing some GR calculations using xAct package. In order to find all dimensional-dependent-identities (DDIs), mathematica has to apply the ...
- 21
2
votes
1
answer
56
views
Solving multivariable equation after setting partial derivative to zero
I have a real-valued function of four variables, namely $L[\phi, m0, m1, m2]$. I am interested in taking the partial derivative $\partial_{\phi}L$ thereof and setting the partial derivative to zero, ...
CommunityBot
- 1
4
votes
4
answers
124
views
Create a new table by deleting some similar rows, provided that their outputs are collected
How to delete duplicate rows, collect their outputs in general, and create a new table.
The figure below shows the idea required to create the new table
The idea is that if the rows are similar in ...
- 53.6k
4
votes
5
answers
228
views
List replacements
Sorry, for the broad title, didn't know how to best describe it. I have a list likes this:
...
- 69.5k
6
votes
5
answers
346
views
Delete special part from a list using Mathematica
I have a list like this:
{{-0.0019,1},{-0.0018,2},...,{0,11},{0.001,6},...}
I need to make a new list that start from zero value. like this:
...
- 69.5k
3
votes
6
answers
1k
views
How to select some sublist in a list of list?
Hopping to be clear, I ask this question after some hour of unsucceeded work
I have this list
...
- 69.5k
16
votes
10
answers
2k
views
What's the foo such that foo[{a, b, c}, 2] produces {a, a, b, b, c, c}?
I can define such a foo like this
foo[list_List, n_Integer] := Join @@ Transpose@ConstantArray[list, n]
foo[{3, {1, 4}, 1}, 3]
...
- 69.5k
5
votes
7
answers
450
views
Flip sign of one variable in list
I have this list of x, y-pairs l={{x1, y1}, {x2, y2}, ...}.
Now I need to flip the sign of the y values only before plotting.
What is the easiest way to do this ...
- 69.5k
6
votes
3
answers
288
views
Plot diagonal lattice path
I'd like to plot lattice paths like RUURUD where R is a step to the right, U is a step above ...
- 72.7k
0
votes
0
answers
54
views
Numeric coefficients of a series/polynomial
In my work, i usually come across expressions of the form: $$\text{L3}=\frac{625 f_5^{30} q^4}{f_1^{31}}+\frac{24458 f_5^{24} q^3}{f_1^{25}}+\frac{25436 f_5^{18} q^2}{f_1^{19}}+\frac{25415 f_5^{12} q}{...
- 23
7
votes
5
answers
179
views
Deleting integers that are sandwiched between symbols
I have a list of symbols and integers:
lis = {a, b, c, 1, d, e, 2, 3, f}
I'd like to delete each integer that is preceded and succeeded by a symbol:
...
- 69.5k