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Mathematica : Recent Questions and Answers (Page 36)

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

Option value check with suboptions

I am trying to adopt very interesting universal option check method. And I am completely lost since in one case in seems working, while in the other don't. I...

Asked on 08/12/2021

0 answer

Evaluating expected improvement in Mathematica

There is a concept in optimization called expected improvement where you sequentially search for the value of x that optimizes the problem. Here is a screen shot of the general...

Asked on 08/12/2021

1 answer

Can someone please help me in drawing this RegionPlot with high precision?

Can someone who has access to Mathematica, please, help me in drawing this RegionPlot with high precision. (I used the basic plan of WolframCloud which I could not increase the...

Asked on 08/12/2021

1 answer

Follow-up to "Plot, extract data to file"

This is literally a follow-up to part of Mr.Wizard's answer to: Plot, extract data to a file Specifically in reference tomultidat = Cases[First @ gr, Line[data_] :> data,...

Asked on 08/12/2021 by JoutlawPhysics

2 answer

Are there any alternatives for NIntegrate to calculate the area for which $f(x,y)<0$?

I have this two-variable function$$f(x,y)= (8 cos (x+y)+7)cos left(frac{x}{2}right)+cos frac{x-2 y}{2}+2 cos left(frac{3 x}{2}right) $$where $0<x,y<pi$. I want to calculate numerically the area for which the...

Asked on 08/12/2021 by user80186

4 answer

How to set the thickness of plot ticks?

I want to draw a plot with specific ticks. So I added the Ticks property. Now, I also wish to enhance the ticks, so I tried to manipulate that using...

Asked on 08/11/2021 by tamir

0 answer

Using units in NBodySimulation function

I'm trying to use NBodySimulation to run a simulation of objects such as stellar masses.I've tried using the InverseSquare and Newtonian settings on NBodySimulation for this, but InverseSquare doesn't...

Asked on 08/11/2021

0 answer

Coordinate transform of discrete data

let's say I have a set of discrete data of dimension n by n by n, which may represent a scalar field $f(x,y,z), x,y,zin [-1/2,1/2]$ in Cartesian 3D space....

Asked on 08/11/2021 by H. Zhou

1 answer

DSolve not evaluating initial condition

I have a system of 1st order equations (it's overdetermined but well posed) that is solved within an arbitrary constant:f[u_, v_] := Cos[u - v]; DSolve[{D[x[u, v], u] ==...

Asked on 08/11/2021 by Daniel Castro

1 answer

Transforming a full $4times4$ symbolic matrix into a full $3times3$ matrix and an eigenvalue

I have a $4times4$ matrix A=begin{pmatrix} 0.16 (cos (text{kx})+2) & 0.55 cos left(frac{text{kx}}{2}right)+(0., +0.76 i) sin left(frac{text{kx}}{2}right) & 0.55 cos left(frac{text{kx}}{2}right) & 0.55 0.55 cos left(frac{text{kx}}{2}right)-(0.,...

Asked on 08/11/2021

1 answer

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