MATLAB: Retrieve original index from a masked array

Question

Hi, I am not sure if it is even possible, but suppose I have an array A and a mask m, and I use some function (e.g. min()) to find the index of an element in the masked function, is there a way to backtrack that element back to the original unmasked array?

In other words:

[~,i] = min(A(m)); % A is an array, m is a logical array mask

Now I want to find the index j such that A(j) is the same element as (A(m))(i)

Thanks,

Answer 1

Repalce the other elements in A with NaN other than mask.

B = A ; 
B(~m) = NaN ; 
[~,i] = min(B); % now the index will be of A