The function for determining the position of a given value in an array.

I have an array storing numerical values, I know the last part of this array are all zero values. How can I find the starting position of this part? In other words, I would like to find the starting position of 0 in this array. Which function should I use?

Answer 1

[Wayne King]

x = ones(1e3,1);
x(750:end) = 0;
index = find(x == 0,1);

If you want to find the first K values.

K = 3;
indices = find(x==0,K,'first');

so

index = find(x == 0,1);

is equivalent to

index = find(x == 0,1,'first');