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Mathematica : Recent Questions and Answers (Page 43)

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

Fit, NIntegrate in FindRoot results in non-numerical values

I'm trying to find certain values of q for which the derivative of the following function is equal to zero:ρ[x_, q_] := ((x + Tanh[x/((2/Sqrt[Pi])*q)])/(1 + x))^2αavgfluid[q_, η_] :=...

Asked on 08/02/2021

0 answer

How do you calculate the area of a surface with edges in mathematica

Like the title indicates, how could I achieve this. Normally what I did for a closed surface is as follows:RegionMeasure[RegionBoundary[BoundaryDiscretizeGraphics[a]]]where a is an output from ListContourPlot3D. However, this...

Asked on 08/02/2021

1 answer

Generate 3 dimensional random vectors

How can one generate a random vector $v=[v_1, v_2, v_3]^T$ satisfying $sqrt{v_1v_1^* + v_2 v_2^* + v_3 v_3^*} = 1$, where $T$ and $*$ denote the...

Asked on 08/02/2021

2 answer

Reduce : This system cannot be solved with the methods available to Reduce

I have a few expressions and need to get a final simplified (reduced,solved) results. I am new and tried/searched different ways for my problem but couldn't find the reason. These...

Asked on 08/02/2021

0 answer

Sorting Eigensystem According to Complicated Rule

I have looked for an answer to this but the near duplicates I could find seemed slightly distinct. I have a matrix $A$ which has eigenvalues in pairs ...

Asked on 08/02/2021

1 answer

How to find the regions for which the derivative of my function changes sign?

I have an energy function of the angles of the electrons' spins. th1 is vector with (2l+2) elements and each element represents the angle of an individual electron spin....

Asked on 08/01/2021

0 answer

Map Function with Table on each row

I need help as I am new to Mathematica. I have a table with some nominal bond values: { {, Nominal, Maturity, Coupon }, {Bond 1, 200, 1, 0.05},...

Asked on 08/01/2021 by Smarter Math

1 answer

Removal of radicals to form algebraic expression

FullSimplify[( Sqrt[(x + h)^2 + y^2] - a) - e (Sqrt[(x - h)^2 + y^2] - b) == 0]How to remove the radicals to obtain an algebraic expression of...

Asked on 08/01/2021

2 answer

LinearOptimization duality

I'm solving a linear program using LinearOptimization. I'm curious why "DualityGap" does not return zero (as described in the docs). Here's the code:yb1 = 10;yb2 = 10;pi1 = 10/9;pi2...

Asked on 08/01/2021

1 answer

Rotate 120-Cell Animation

I have seen some code (https://mathematica.stackexchange.com/a/9593) to create an animation of a hypercube rotating, but I'm really struggling to understand how it works. I find it quite complicated. Suppose...

Asked on 08/01/2021

0 answer

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