excluding zeros from min of matrix column

[r, c] = find(A==min(A(i:n,i)),1);

this statement is being used to find thelocation of the minimum of a certain column given a for loop incrementing i. Can I edit this statement to exclude zero entries? On matrices without negative values, it is setting the minimum to zero, and I am not sure where or how I could include A~=0 in this statement.

[Stephen23]

Either:

1. use indexing to subsample the data to exclude the zeros, or
2. replace the zeros with +Inf,

then find the minimum.

[Brad Sullivan]

Thank you for this! I devised the following solution to find a way around this that implemented subsampling the data which seems to work:

    tempRow = A(i:n,i);
    [r, c] = find(tempRow==min(tempRow(tempRow~=0)));
    p = r;
    if i > 1
        p = r+i-1;
    end