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Mathematica : Recent Questions and Answers (Page 158)

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

Using Mathematica for tensor analysis

Has anybody used tensors in Mathematica? How to properly work with them?I find Mathematica not very friendly in this field, as I am defining my own functions for lowering...

Asked on 02/25/2021

2 answer

Replace symbols with values without evaluation

If I have assigned values to a, b and c:a=7;b=5;c=6;and I select the expression:(a+b)/cand I press cmd + enter in the Mathematica frontend, the expression will be replaced...

Asked on 02/25/2021 by Tyilo

5 answer

Optimization problem over two variables

Given the function fun1[a, b, x] , I want minimize this function over $a$ and $b$ such that $0le a le 2pi$ and $0le ble 2pi$,...

Asked on 02/25/2021

1 answer

Interactive Machine Learning App to make Predictions using Descriptors

I have developed a Machine Learning algorithm that uses 4 chemical descriptors to calculate a chosen chemical property. I would like to create an interactive app on Mathematica (using the...

Asked on 02/25/2021 by Nawn

1 answer

State Space Model in Controllable Canonical Form

Mathematica by default puts state space model realizations in controllable companion form, as seen here:tfsys = TransferFunctionModel[(b1 s^2 + b2 s + b3)/(s^3 + a1 s^2 + ...

Asked on 02/24/2021 by user74620

1 answer

Turing patterns

I am new in learning Turing patterns. Is there any sample code available to generate such patterns in ecology model (Lotka–Volterra model)? ...

Asked on 02/24/2021 by Sankha

2 answer

How to make a smooth highly contrasted image from a Blur, without affecting the sides?

I'm generating a random texture using the code above, by blurring random tiles:randomTiles = Table[{RandomReal[], RandomReal[], RandomInteger[{1, 2}]}, {n, 1, 1500}];Sharpen[Blur[ListDensityPlot[ ...

Asked on 02/24/2021

1 answer

Plotting a Piecewise function that returns implicit equations using ContourPlot

I am using ContourPlot to plot implicit equations. Plotting separate implicit equations seems to work fine, however I can't get ContourPlot to plot a piecewise function that returns implicit equations....

Asked on 02/24/2021

2 answer

Ways to speed up numerical integration

This first code block is just to create the functions I'm considering. Actual problem follows.f[t_, ts_, τ1_, τ2_] := Piecewise[{{Exp[-τ1/(t - ts) - (t - ts)/τ2]/(2 Sqrt[τ1 τ2] BesselK[1,...

Asked on 02/24/2021 by corey979

2 answer

How to explain these results of integration of DiracDelta?

Let us considerClearAll["Global`*"];Integrate[DiracDelta[1 - x^2 - y^2], {x, -1, 1}, {y, -1, 1}](*[Pi]/2*)Let us verify it, making use of approximations of delta-distribution in weak topology (more exactly, making use...

Asked on 02/24/2021

4 answer

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