Mathematica Questions, Problems & Solutions : TransWikia.com ~ Page 57

DSolve doesn't respond

So I am trying to use DSolve to solve the following system of equations:eqns = {c1'[ t] == -I/ h (H12 c2[t] E^(-I W12 t ) + ...

Asked on 07/13/2021 by Nikolaos Petropoulos

1 answer

Finding periodic cycles of a function

Given a function f[{x,y}] it is rather simple to use, for example, NSolve to find periodic points of period $n$. We simply take something like NSolve[f[f[f[{x, y}]]] == {x,...

Asked on 07/12/2021

0 answer

DSolve fails on initial value problem of 1st order ODE

I've been trying to solve this initial value problem using DSolve[]: $$frac{dy}{dt}=1+tspace sin(tspace y),quad y(0)=0, quad t=[0,2]$$ClearAll[y, t]eq1 := {y'[t] == 1 + t *Sin[t y[t]],...

Asked on 07/12/2021 by Walser

1 answer

Eigenvalue and SparseArray

This the code of Hofstadter spectrum for square lattice using Mathematica matrix[p_, q_] := Module[{sigma}, sigma = p/q; N@SparseArray[{{m_, m_} -> ...

Asked on 07/12/2021 by Yduog chan

1 answer

Mathematica 11 Symmetry Packages

Are there any symmetry finding packages (for differential equations) that work with Mathematica 11.1? I've tried MathLie but from looking at the documentation it had instructions for Windows 95... I...

Asked on 07/12/2021 by Pythonista

2 answer

Art on mathematica with filled circles and straight paths: how can I reproduce minimalist suns?

I would like to know: how can I construct minimalist images like this one? ...

Asked on 07/11/2021

2 answer

Exporting complex exponential float arrays to Python

A question related to a previous question. The answer in the previous question works well for simple complex arrays but not when considering arrays with exponential float coefficients as...

Asked on 07/11/2021

1 answer

A complicated answer to a simple Integral

This simple integration:Integrate[ E^(I q x)/(q + I [Kappa]), {q, -[Infinity], [Infinity]}, Assumptions -> { x [Element] Reals, [Kappa] [Element] Reals, x != 0, [Kappa] != 0 }]gives a...

Asked on 07/11/2021

1 answer

function within function

delFunc[funcform_, lstofparams_,lstoferrs_] := √Total[Table[(D[funcform, lstofparams[[i]]]*lstoferrs[[i]])^2, {i,Length[lstofparams]}]]funcanderr[funcform_, lstofparams_,lstofvals_] := {funcform,delFunc[funcform, lstofparams, #[[2]] & /@ lstofvals]} /.Table[lstofparams[[i]] -> lstofvals[[i, 1]],{i,Length[lstofparams]}]I want to evaluate the numerical value of "funcanderr" with some...

Asked on 07/11/2021

1 answer

3D rigid body physics engine

Is there a package in Mathematica that will allow me to simulate collisions of 3d rigid bodies? If not, what known libraries could I use and how? For example, one...

Asked on 07/11/2021

1 answer

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