How can solve the explicit equation by using matlab

Dear all How can i find the value of b (a constant greater than zero) in the following equation by using Matlab function

exp(-b^2/2)/b^3=1.39

I am looking forward to your help

With best wishes

zahid khan

Answer 1

[Torsten]

fun=@(x)exp(-x.^2/2)./x.^3-1.39;
sol=fzero(fun,[0.5 1]);

Best wishes

Torsten.