# All Questions

59,967 questions
27 views

### Some bold curves in phase portrait

In the phase portrait plot, how can we bold some curves with different colors? I am trying the solve the system of ODES but failed to get produce any output. ...
54 views

### Mathematica 12.0.0 crashes on second 'Quit[]'

I am trying to develop a module, and run 'Quit[]' from within a cell in a notebook to clear all symbols before reloading the module that I have modified. The second time I do this after starting ...
21 views

### Cell Bracket Clarification

I am running a very simple program that uses NotebookEvaluate to evaluate an open notebook that only has the context of saving and closing, and while it completes that task, the program gets stuck in ...
11 views

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### StarData: proper motion of a star in HelioCoordinates

I am not an astronomer, but am trying to calculate the trajectory of an interstellar space probe, for example to Proxima Centauri. The HelioCoordinates seem appropriate, as typically used within the ...
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### How to make an imported 3D Image look like X-Ray?

I have a human chest data as below:- ...
59 views

### Speeding up the calculations by Reduce and NSolve

I have a non-linear system of equations with numeric parameter values as shown below. I first tried FindRoot with given initial values and it did not converge. Then ...
24 views

### Extract substring: knowing the starting characters and form

I'm trying to extract a specific part of a long string, where the part of interest starts with "testx" and ends with a number before an underscore follows, so e.g., ...
33 views

### Differential equations with recurrence [on hold]

I have a system of differential equations. The equations are coupled in this way: $\qquad f'_n(x) = A f_{n-1}(x) + B f_{n+1}(x) + C f$ I would like to solve the system. I am a beginner in ...
25 views

### Disable Message Windows

Is there any way to disable Mathematica's internal popup windows, such as "Why the beep?" Cannot seem to find any documentation on the ability to turn it off, but need it turned off to write some ...
38 views

### How can I plot a function (unidimensional) in a 3D plot

I would like to plot a figure like that using Mathematica. They figure are three plane wave ( cosine or sin ) all share and have the same coordinate origin. As you observe, the waves propagate along ...
120 views

### Possible bug in ListDensityPlot in Mathematica12

I'm having some problems with ListDensityPlot in Mathematica 12 on MacOS Mojave. Here is the code: ...
36 views

### Function to join variable names

I am trying to define a function that takes any two strings (possibly defined as variables, functions, etc.) and join them in one string. For example, join[f,x] ...
23 views

### Expanding integer compositions

Quick version: I would like Mathematica code that, for instance, turns {3,1,2} into {3,3,3,1,2,2}. More formally, given positive integers $c_1, \ldots, c_t$ which sum to $n$, produce the length $n$ ...
33 views

### WebExecute timeout

There isn't much tuning freedom available in the WebExecute method. If a page takes too long to load you only see a spinner or a blank for CapturePage. Does someone ...
31 views

### Result of BooleanCountingFunction?

Folks, when i use BooleanCountingFunction[{1}, {v1,v2,v3}, "CNF" ] i get a neat output like: ...
22 views

### Mapping the FindMinimum function over a matrix

I'm quite new to Mathematica and so still trying to work out how to use some of its syntax and functions. I have a function for the free energy of a generic system with two order parameters. I am then ...
19 views

### Using a stylesheet to create a footer that prints the directory name of the current file

I am trying to create footer in a stylesheet that will use the directory name of the current file as the footer. For example, consider the following temp.nb file with stored within the CalculusI ...
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### RegisterExternalEvaluator with command line options

I'm trying to register NodeJS as an external evaluator in Mathematica 12.0. This works fine generally speaking. (i.e. following https://reference.wolfram.com/language/workflow/...
34 views

### Calculate plausibility in Dempster-Shafer theory

I want to use Mathematica to show which subsets of a power set are required to calculate the plausibility for a given set in a power set. This has lead me to compute a summation with a ...