MATLAB: Counting zeros

Question

Hi,

I would like to know how to calculate the number of zeros in an array and stop when the array value is one.

Example: a = [0 0 0 0 1 1 1 0 0 0]

here, there are 4 zeros before it meet array value of one.

then, let say I convert binary to RGB, 0=green and 1=red. The same thing goes here…how I want to calculate green pixel before it meet red pixel.

Anybody can give any idea. Thank you in advanced.

Answer 1

one method you could use is to find the first position where a == 1 and then subtract 1 from it:

    num_zeros = find(a == 1, 1) - 1;