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Questions about the use of built-in Mathematica functions, including pure functions.

0
votes
3answers
I'm trying to solve : NSolve[3 r Sqrt[x/(1 - x)] + 1/2 r^3 (x/(1 - x))^(3/2) - ( 3 r x Csch[r Sqrt[x/(1 - x)]])/(1 - x) == 0, {x, 0.5, 1}, {r, 0, 5}] My goal is to have a relation r(x), with r …
asked Dec 5 '18 by J.A
5
votes
3answers
So I have this function : Sqrt[-1 + Tanh[#1 - #2]^2] & How can I transform it into f[x_,y_]=Sqrt[-1 + Tanh[x - y]^2] I tried Sqrt[-1 + Tanh[#1 - #2]^2] &/. #1 -> x /. #2 -> y /. & -> 1 But …
asked Aug 3 by J.A
3
votes
2answers
How can you change f[g[x,t],t] to f[g,t] ? I have differential equations Derivative[1,0][f][g[x,t],t]== f[g[x,t],t]*t+Derivative[2,0]f[g[x,t],t] And f'[g[x,t]]== f[g[x,t]]*t+f''[g[x,t]] …
asked Aug 8 by J.A
0
votes
0answers
I have a code for solving a system of 2 differential equations (sol1). Given that what's inside is a bit heavy, I define functions so that I can call them. My issue is that when I write everything … explicitely it works,and when I call functions inside NDSolveValue, it doesn't work anymore. Could you help please ? (I call Numerical Calculus because I thought that in NDsolveValue it can play a role …
asked Jun 14 '18 by J.A
1
vote
0answers
I have a system of differential equation with this structure : $$\left\{\begin{split}&\partial_t n(t,r) + \nabla. \big(n(t,r)v(t,r)\big)=0 \\ & f\Big(n(t,r),v(t,r),\partial_r n(t,r),\partial_r v(t,r) …
asked Jul 11 by J.A
0
votes
1answer
I have an equation that I want to solve, and I'm using DensityPlot, as I was told here NSolve two unknowns $ r, x $ in order to have a curve $ r(x) $ . Meaning I have a relation $f(r,x)=0$, and with …
asked Dec 5 '18 by J.A
0
votes
0answers
So I have a very simple question related to a simple topic, but also directly related to a fitting problem. I see that my question is related to this question but I don't manage to make the bridge be …
asked Jun 19 by J.A