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Results tagged with Search options user 1553

Questions on the analytic and numerical equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).

1
vote
2answers
I am trying to solve the following nonlinear ODE, but Mathematica takes forever to give a result. Any idea why? eq = f''[r] + r^-1 f'[r] - r^-2 f[r] + (1 - r^2) f[r] == 0 g[r_] = f[r] /. NDSolve[{e …
asked Jan 19 '16 by usumdelphini
2
votes
1answer
I have got to solve a second order equation, where the coefficient depend on the parameter $k$: $$(A_k - \omega) (D_k- \omega) - B_kC_k = 0$$ so that also the solution $\omega=\omega(k)$ will depend …
asked Nov 22 '13 by usumdelphini
0
votes
1answer
I need to fit an implicitly defined curve. I thought I could get some data out of Solve, and then using FindFit. Therefore, I would like to find the relation the parametric curve defined by $F(x,y)=0 …
asked Nov 24 '15 by usumdelphini
2
votes
3answers
I have two functions $f(r,\phi)$, and $g(r,\phi)$. What is the best way to find the curve in the plane $(x,y)$ or $(r,\phi)$, over which $f(r,\phi)=g(r,\phi)$? I know how to plot it, using ContourP …
asked Nov 19 '15 by usumdelphini
2
votes
2answers
Setting up the problem I want to study the common zeros of these two functions: r[x_, y_] := Sqrt[x^2 + y^2]; Θ[x_, y_] := ArcTan[x, y]; f[x_, y_, t_] := 1/2 - BesselK[0, r[x, y]]/(2 BesselK[0, 1]) …
asked Aug 10 '16 by usumdelphini