# All Questions

1answer
47 views

### Constrain Fit to make a fit that remains positive over the range of my independent variable

For example, say I have the following data. ...
1answer
127 views

### Coloring a set of polygons, each polygon to have a specific color

In addition to my previus post, regarding plotting the surface of a Möbius strip, I now realised, that some of the eigenmodes for a Möbius strip are either oscillations of a scalar field OR a vector ...
0answers
122 views

### Plotting multiple curves with multiple axes (>2) on the same plot

I'm attempting to generate a graph that depicts mulitple time series, measured in different units (but with a common time scale) on the same graph. This is a generalization of the familiar ...
2answers
101 views

### What is wrong with combining two programs with event handlers?

I can delete the unwanted nodes of a RandomGraph by double-clicking on them from the first program, and I can change the positions of the nodes by dragging them ...
2answers
59 views

### Enlarging a contour plot

I just started using Mathematica, and when I entered the following: ...
2answers
94 views

### Returning ancillary computation results from a function

Suppose I want to implement a function to solve a very basic Elliptic problem using Finite Element of some degree (It's just an example). Normally the user of my function is only interested to the ...
1answer
126 views

### Piecewise conditions with a parametric PDE

I'm using ParametricNDsolve to check best fit of a model (function Eb1) with some data, and I have four free parameters I want to test. I can easily construct a Parametric solution between the two ...
2answers
80 views

### FindFit is producing a list of imaginary numbers when there is non

I am trying to find the fit of an equation to some data and mathematica thinks there is a list of imaginary values. My data is all real positive number. ...
1answer
48 views

1answer
113 views

### Loading and processing five files at a time from a directory containing many, many files

I have 3000 files (for example: aa101.csv, aa108.csv, aa120.csv, ...) and I need to process them. I need to load five files from a folder, process them, and export them to new list in Excel. Then I ...
0answers
86 views

### puzzled with ColorData

At first let me thank, from this point as well, those that they replied to my previous queries. From a reply I got, I obtained finally the desired graph. ...
0answers
74 views

### Antialiased text in manipulate constantly re-evaluated, ignores TrackedSymbols

I am trying to display antialiased text (using the ImportString[ExportString[]] method shown here) but inside a manipulate so that the text can be changed interactively. I have found a way to do this, ...
1answer
91 views

### How to update Print-out “in place”?

I want to run an exhaustive search algorithm that will take several hours to finish, so I'd like to have it execute Print statement periodically, showing the ...
0answers
62 views

### Pass model parameters to NDSolve'Reinitialize

I am wondering if there is a way to pass parameter values during the NDSolve'Reinitialize step of the NDSolve process? I've read that one way to possibly speed up repeated calls to NDSolve is to ...
1answer
128 views

### Matrix constructed as a function inside a for-loop [closed]

I am trying to construct a matrix A which depends on variables x and y through iteration. My ...
1answer
203 views

### Arranging and combining multiple plots and graphics

I have 4 plots/schematics. They are either created with ArrayPlot[], ParametricPlot3D[] or Graphics[]. As I play with calculation resolutions their absolute sizes will change. I would like a neat way ...
1answer
109 views

### Identifying the color in Image

This has mad me Crazy for a while Can any one please Help me solving this this is the Image that I am working on . Basically this image is made up of 98 different color patches 7 patch on each level ...
2answers
54 views

### Modifying elements of a matrix after construction [closed]

Suppose I have constructed a matrix with all elements as a constant (say 1): N=4; A=ConstantArray[1, {N, N}]; Now I want to make A(2,3)=23 and A(4,3)=43. Can I ...
1answer
76 views

### Density plot of asymptotic behaviour of a linear system

Good morning, I have an ODE linear system $\dot{\vec f} = A \vec f$ depending parametrically to two real parameters, s and p. I'd like to get a density map of the solutions of $f_A/(f_A+f_B)$ at ...
1answer
232 views

### Show Progressbar after pressing a button

I've recently struggling with Buttons. So I understand Buttons have the form Button["text",action]. Now I want the action to be ...
1answer
232 views

### Why Plot3D does not accept Epilog option [closed]

I am trying to visualize 3D points with Plot3D using the option Epilog. If you check the options of Plot3D ( Options[Plot3D] ), it can be seen that Epilog is one of ...
1answer
117 views

### How to preserve In/Out tags like what they did in documentation files

Every evaluation generates a pair of In[n]/Out[n] signs tagged before actual input and output. Like the following: If I save the file, close it and re-open it, that In[n]/Out[n] signs will ...
1answer
101 views

### Plot CPU time vs iteration? [duplicate]

I would like to generate a plot of CPU time vs number of iterations. For example, if I were to calculate the solution of a system of differential equations in state-space form using the summation of ...
1answer
87 views

### Find exact value

I want to know exact x'[t] value where z[t]=0 I know approximate x'[t] value is 107 but I cannot find how to find exact x'[t] value ...
0answers
64 views

### Making sense of output of Assuming/Refine

I have a conditional statement as output: ...
1answer
170 views

### Numerical solution of the hyperbolic equation

I am trying to solve the following hyperbolic equation with given boundary conditions: I choose as initial condition $u=1$, and evolve the above hyperbolic equation until reaching a stationary ...

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