All Questions

61,567 questions
114 views

How to plot this compound function?

I have a function w1(x1), w2(x2) and w3(x3), u1(x4) and u2(x5). Using these functions, I like to plot the deformed configuration of the structure, below is the undeformed configuration of the ...
42 views

Automatic Manipulation of experimental data and plotting

I have experimental data which looks like this In the high positive and negative x-axis regions, my data is always linear, I want to extract the slope of data in these regions, take average and ...
60 views

NBodySimulation

My question is about new NBodySimulation package in version 12. I figured out how to customize the basic functions "PairwisePotential", "PairwiseForce","ExternalPotetial"... The next unresolved issue ...
26 views

Generating audio from integer list data

I have integer list data which I am outputting to MIDI format, however the list data range of values is much greater than the MIDI note range, so is it possible to use the min and max value in the ...
60 views

How to make a diagram and get the exact intersection points at the same time?

Here is the code. A part of the diagram is not a function. ...
32 views

How to deal with the derivative of an variable upper limit integration by the symbolic form?

I need a rusult with the following form D[Integrate[f[t], {t, low[x], upper[x]}], x] (*Out[]=-f[low[x]] (low^\[Prime])[x]+f[upper[x]] (upper^\[Prime])[x]*) My ...
59 views

Rearranging a list of data

I need help for rearranging my data If I have data for 10 cases depends on L values (from 1 to 10) and every case has 5 columns (the first row has 5 values for L=1, the second row is for L=2, and ...
25 views

Linear Programming using Maximize

I am trying to solve a more complicated version of the following LP problem: I have some constraint amounts a,b,c and two variables made of those amounts. I would like to find the best way to ...
30 views

$2+2+\dots+2$ cycle conjugation classes of the symmetric group $S_n$

Command GroupElements[SymmetricGroup] gives me all cycles of all conjugation classes. But I'm only interested in the 2+2 class ($2+2$ being one of the integer ...
49 views

Problem finding separatrices for ODE system

I have a system of two ODEs for which I would like to plot the separatrices. I tried the very neat method given here by Michael E2. Unfortunately, that code doesn't work for my system since the ...
70 views

Improving identicon graphics

This question has two parts, a technical part about graphics, and a creative part. I'll accept answers primarily re the first part. The application is to come up with graphical identicons to ...
33 views

How can I fix an error when I try to draw a region function in a contour plot?

I am trying to draw a region function in a contour plot. My function has five variables and I want to reduce the number of variables by assuming some appropriate values for three of the variables. ...
77 views

Say you want to plot a horizontal plane using ContourPlot3D[x == 0, {x, 0, 100}, {y, 0, 100}, {z, 0, 100}] How to turn off the shading? I would like to have only ...
40 views

How can I make a scatter plot from a matrix with many y-axis values for each x-axis value?

Consider matrix A = {{0, 2.54343, 3.566, 4.2323, 2.3434}, {0.1, 6.432, 4.6465, 5.656, 1.34}, {0.2, 0.3423, 1.6342, 3.323, 2.04}}; The x-axis values ...
41 views

Separating periodic solutions from list of solutions in NDSolve

I am solving a second order differential equation using the following code ...
35 views

Piecewise function to include SawtoothWave function

I am trying to write a Piecewise function that includes the SawtoothWave function. Can someone indicate how to do this, or if it is possible within mathematica? The piecewise code is here: ...
28 views

How to collect a tensor in an equation?

Is there any way to collect a special tensor (for example the metric tensor) in a tensorial equation? I mean a command like Collect in the non-tensorial ...
188 views

35 views

Replacing a line by a cylinder

How can I replace the line in the following graph by a tiny cylinder? parametricPlot3D[ {CosSqrtt, Sin[Sqrtt](3+ Cos[t]), Sin[t]}, {t, 0, 100}]
104 views

Efficient way to iterate over large list and check conditions

The problem I am trying to solve is how to assign charges to a number of particles based on some conditions on the charges. It is conceptually very simple but requires processing a very large list. ...
29 views

Problem with numerical precision of the N command

I am trying to learn Mathematica. I found some unusual behavior with the N command. Here is my code. ...
53 views

How to add a сolumn from one table to another?

I have a rather naive question. How does one add a column from an already existing table to another already existing table?
39 views

Can't get Animate[] to work consitently

Wave on string from [0,L=10]. Endpoints fixed and initial conditions a double sinc: Ti1(x) = Sinc[3*(x - 7)] + Sinc[3*(x - 3)]. Initial velocity Ti2(x)= 0. Evaluating as expansion and trying to ...
64 views

How to plot that function?

I have a function P which is dependent on x, I tried plotting the function but I am getting nothing in the plot. I am also interested in finding the roots of the equation. ...
100 views

MMa version of $\LaTeX$'s overtilde doesn't look as expected

I am (mis)using Mathematica as a WYSIWYG LaTex editor. I want to put a (long) tilde over an expression. ...
59 views

Apply a transformation to one sublist of a list

Say that I have a list of the form A={1,2,{{3,4},{5,6}}} I want to manipulate the first elements of the last sublist. For example, in the case of multiplication ...
259 views

Operator currying: how to convert f[a,b][c,d] to {a+c,b+d}?

This question is related to this golfing question (but I'm not interested in golfing, only in functional operator composition): How can we convert f[a,b][c,d] to <...
30 views

How to obtain the correct interpolation for the following data?

I have a dataset DistrTemp.dat. It represents a set of data in the form {{x,y,z,f[x,y,z]}}. Here, x defines a system, while ...
31 views

Manipulation of a plot computed in several steps

the following test works for fixed parameter si: ...
91 views

Selecting unique column position of a non-zero value for each row of a matrix

I have a matrix in this case of 3x11, but I want this to work for any dimension matrix. I want per row a column position on a non-zero value in that row, but that this value should be different than a ...
55 views

Animated wrapping line and wrapping cylinder

I am trying to draw the following situation using any graphic program but I couldn't since I don't know how to make the animation. So your help is greatly appreciated. So my picture consists of two ...
30 views

How to get some Gaussian distribution from image areas? [closed]

how to get some Gaussian distribution from some areas of an image. for example, I have a contrast or luminance channel of an image and I divide it into 12 areas, now I should get Gaussian distribution ...
33 views

Deriving a probability density function from data without interpolation

I have a dataset having the form {{x1, y1, z1, f[x1, y1, z1)}, ...}, correspondong to coordinates and values of the probability density of a distribution. I am ...
38 views

Efficient ListConvolve over 3d matrix

I'm trying to find an efficient way of applying list convolve to a 3d matrix of 0 and 1, where about 5% of the matrix are 1, but the 1s may either be randomly placed, or grouped in one large ...