[ArtemusMaximus]

Originally Posted by Ether

The inverse of a function f(x) is not 1/f(x).

The inverse of f(x) is g(x), such that g(f(x))=x

For example, the inverse of f(x)=x² is g(x)=sqrt(x), not 1/x²

octave-3.6.4.exe:10> erfinv(0.33)
ans =  0.301332146133706
octave-3.6.4.exe:11> 1/erf(0.33)
ans =  2.78335488667249

I knew Ether would show up and clear all this up