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Mathematica : Recent Questions and Answers (Page 41)

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

Integral involving orthogonal functions (quantum harmonic oscillator eigenstates)

I have a question about the capabilities of the Integrate command for general parameters. We know that there is a system of functions:[CurlyPhi][n_, x_] = HermiteH[n, x]/Sqrt[2^n*n!*Sqrt[[Pi]]]*Exp[-0.5...

Asked on 08/05/2021 by Gomboc

1 answer

How to take derivative of a expression with respect to a function?

I want to program the Euler-Lagrange equations for continuous systems.But in this formulation I have to compute the derivative of the Lagrangian with respect to all the derivatives of...

Asked on 08/05/2021 by Gabriel Sandoval

1 answer

Inefficient Manipulate code with plots and integrals

I did this manipulation piece based on Boltzmann distribution but I noticed that is rather slow, any ideas how to improve this code?kb = 1.381*10^-23;Nav = 6.022*10^23;m = 0.032/Nav;Manipulate[...

Asked on 08/05/2021 by DJR

2 answer

Graphics3D: Background object erroneously placed in front of foreground object

I want to plot the trajectory of a particle running on sphere together with the particle sitting on top of the last point of the trajectory. The problem is that...

Asked on 08/05/2021

0 answer

Mathematica shut down when loading codes

Yesterday my mathematica code can ran.However, now whenever I open it in Mathematica, Mathematica shut down immediately...I tried other files, and they can be opened in Mathematica. Is it...

Asked on 08/04/2021

0 answer

Solving $L=frac{3}{2} sqrt{4 pi ^2 A^2+W^2}-frac{sqrt{5 W sqrt{4 pi ^2 A^2+W^2}+6 pi ^2 A^2+3 W^2}}{sqrt{2}}+frac{3 W}{2}$ for $W$

When I solve the aforementioned equation for $W$ or $A$ on Mathematica I get a long and ugly equation in return, namely one of the solutions for $W$ is: (attempt...

Asked on 08/04/2021 by J.D'Almbert

5 answer

Conically shaped pit

I need help with b. I tried to use the find root but it didn't work !...

Asked on 08/04/2021 by Kassidy Moy

1 answer

How to do System Dynamics simulations / diagrams in Mathematica?

System Dynamics is an approach to understanding the behaviour of complex systems over time. It deals with internal feedback loops and time delays that affect the behaviour...

Asked on 08/04/2021 by Luxspes

4 answer

How to make a change of variable $y=x^2$ in the differential operator $frac{d^2}{d y^2}$?

I have this differential operator$$frac{d^2}{d y^2}qquad (1)$$I want to make a change of variable $y=x^2$ in $(1)$ so that I get this differential operator...

Asked on 08/04/2021

2 answer

MMA 12.2 freezes while closing notebooks with many plots

I recently upgraded to 12.2 and revisited some notebooks made last year (presumably in 12.0 or 12.1). It quite often happens for big notebooks (typically larger than or around 200MB)...

Asked on 08/04/2021

0 answer

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