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Mathematica : Recent Questions and Answers (Page 62)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

How should I export data with desired precision to output file

I want to control the number of decimal points in the output file.input={33.04177277115046 + 8.9984286747054116/e^4, 1.56875 ...

Asked on 07/05/2021

1 answer

Classify and Predict results that I don't understand

I have a list of rules that has as the left hand side the font size and a letter and for the right hand side the space in pixels between...

Asked on 07/05/2021

0 answer

Possible way to plot the solution density of diophantine equations

Well, I'm trying to investigate the density of solutions to Diophantine equations. What is a general method to describe that density? I've two functions: $$varphileft(text{a},text{b},text{c}right)=thetaleft(text{a},text{b},text{c}right)tag1$$ I will look for...

Asked on 07/05/2021

1 answer

How can I highlight a moving bar in an animation of a bar chart?

I wrote the following code, but I don't know how to highlight the moving bar.bsort[list_] := Module[{A = list, tmp}, tmp = Reap[ ...

Asked on 07/05/2021 by chyanog

3 answer

Approximating step function with Tanh to compute integral

It is easy to compute by hand the following integral. $$ Q(k) = lim limits_{varepsilon to 0} int_2^{infty} frac{e^{-varepsilon r}}{k}sin(kr) mathrm{d}r = frac{cos(2k)}{k^2}$$ I wanted to use smoothened version...

Asked on 07/04/2021

2 answer

How to convert list to cycles?

My code below returns the list: {1, 3, 2, 4}. I want the disjoint cycle representation of this permutation. In other words, I want: Cycles[{{2, 3}}]. I tried...

Asked on 07/04/2021

0 answer

Can Mathematica solve matrix-based parametric (convex or semidefinite) constrained optimization problems?

I have gone through Mathematica's documentation and guides on ConvexOptimization, ParametricConvexOptimization and SemidefiniteOptimization. I am also running the latest version of Mathematica. The kind of matrix-based, parametric, constrained optimization problems...

Asked on 07/04/2021

0 answer

Merge two datasets of different sizes

I have two data tables formatted as DataSets. The first one has five keys: date, origin, destination, type, value (sample below).{<|"date" -> 2008, "origine" -> "Terre-Neuve-et-Labrador", "destination"...

Asked on 07/04/2021 by EBassal

2 answer

ClearAll required twice on a symbol with SyntaxInformation

SyntaxInformation[f] = {"ArgumentsPattern" -> {}};f[] := 0;After one ClearAll[f] or ClearAll["`*"], f remains black. It takes two to turn f blue, and it can't be in the same cell:...

Asked on 07/04/2021

1 answer

fitting an ellipse to a data

I want to fit an ellipse model to a data. This sample data I extracted from a simple parametric plot of 2 Sin[t], Cos[t](Let's say, I don't know that) and...

Asked on 07/04/2021 by Rupesh

2 answer

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