If else log2 statement on matrix

2017 5 23
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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!

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John D'Errico
John D'Errico 2017-5-23

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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));

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