Find the index of the lowest number greater than zero in a vector

I would like to find the index of the lowest number greater than zero in a vector. ex: [0,0,4,5,0] The answer should be 3 because 4 is the third element.

Answer 1

[Azzi Abdelmalek]

A(A==0)=inf
[~,idx]=min(A)

[Erik Lenstrup]

Works great thank you!