# Search Results

Results tagged with Search options user 58104
7 results

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

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
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 …
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]] …
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) …
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 …