MATLAB: Finding the n’th element satisfying a condition

Question

I have a huge array A (about 30 million elements) and I'm trying to extract the n'th element satisfying a condition A == b. Currently, I' using the following:

x = max(find(A == b,n))

Is there a more efficient way to do this since I need to do this several times in my code?

Thanks.

Answer 1

That looks good to me. The only thing that might make it faster would be to index instead of use max():

idx = find(A==B,n,'first')
idx(end)