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Mathematica : Recent Questions and Answers (Page 239)

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

3D plot with constraints

Given the 3D plot Plot3D[Sin[x y], {x, 0, 2 [Pi]}, {y, 0, 2 [Pi]}], how can one highlight the portion with $x+y=1$....

Asked on 08/31/2020

4 answer

Hypothesis testing with LogLikelihood methods in Mathematica

I'm trying to understand Likelihood methods and hypothesis. To this end I am trying to construct small examples that I can play with. Let's say I have some data which...

Asked on 08/31/2020

2 answer

Derivative not evaluating when function defined

I have the following code ExD = Sum[D[y[n, t], t], {n, 0, 1}];ExS = Sum[y[n, t], {n, 0, 1}];σ[0] = 1;σ'[0] = 1;y[0, t_] = σ[0] + t σ'[0]ExDExSNote...

Asked on 08/30/2020 by Decebalus

1 answer

ParametricNDSolve is not returning results when I use list of functions

I am solving DE w/ parameters. It has many functions so I tried to automate using list but it is not working. Specifically, it does not give specific value even...

Asked on 08/30/2020 by khvillegas

0 answer

Contour Integration in Mathematica

I need to solve an integral similar to following for a project: begin{equation} F[p^2_,q^2_]equivint_0^{infty}dk, e^{-k/lambda}, frac{k}{k-b[p^2,q^2]- Iepsilon}ln(k-b[p^2,q^2])end{equation} Here, $lambda$ is a real number, while $b$...

Asked on 08/29/2020 by Bharti Kindra

0 answer

Sensitivity analysis of parameter on eigenvalues of predator-prey model

I am trying to do a sensitivity analysis of the parameter g on the eigenvalues of this simple predator-prey Lotka Volterra model. I know that this code is entirely wrong,...

Asked on 08/29/2020 by Clara

1 answer

How to do Interpolation to this function after given b this values

[Chi][b_] := (Z/k)*NIntegrate[Subscript[f, pp1][q]*Subscript[F, pp1][q]*BesselJ[0, q*b]*q, {q, 0, b}]; bList = Table[b, {b, 0, 5.1 , 0.05}] where:Z = 6;k=1.55246; Subscript[f, pp1][q_]=(6.254736279890945*(1 - 1.4511668475476842))/E^(0.2115*q^2)...

Asked on 08/29/2020 by user69941

1 answer

LieArt --- 3 different 8 dimensional irreducible representation of $mathrm{SO}(8)$ and their decompositions

I am using the LieArt which you can download freely online https://arxiv.org/pdf/1206.6379.pdf There are three different 8 dimensional $mathrm{SO}(8)$ irreducible representations, formally it is written...

Asked on 08/29/2020

1 answer

Why doesn't Mathematica ComplexExpand integrals?

Consider this code example:ComplexExpand[Re[Integrate[f[t], {t, a, b}]]]Mathematica gives me the result asRe[Integrate[f[t], {t, a, b}]]which is obviously not helpful and not what should happen in my understanding. If...

Asked on 08/26/2020

0 answer

Pie chart plot formatting

I have been looking through numerous stack posts to answer 1-4 below.I am trying to generate a pie chart with several very small slices that have long labels.when I...

Asked on 08/23/2020 by wiscoYogi

1 answer

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