If else log2 statement on matrix

I have a matrix that is about 3000x7, containing either a number or a zero. I'd like to get the log2 value of each number, but if the value was zero, I'd like for it to ignore that value.

What I have tried initally: if matrix>0 log2(matrix); else matrix==0; end

I know I'm most likely no where close to correct, but I'm still very new to Matlab. Any help would be appreciated! Thank you!

Answer 1

[John D'Errico]

If statements don't work that way. They don't allow you to treat each element of the matrix independently.

matrix2 = zeros(size(matrix));
ind = matrix > 0;
matrix2(ind) = log2(matrix(ind));