How to find the position of the first non-zero element of my matrix?

For example, if I have a column data like the below:

A = [0; 1; 0; 0; 0];

The answer would be 2.

For the below example:

B = [ 0; 0; 1; 0; 1; 0; 0];

The answer would be 3.

Is there a function to do that quickly?

Answer 1

[Stephen23]

find(yourVector,1,'first')

[Leon]

Many thanks for the tip!