MATLAB: Matrix value change with conditions (x=y*(mask==1))

MATLABmatrix manipulation

I have two matrix x,y and mask. 
x = [1,1,1,1;...
     2,2,2,2;...
     3,3,3,3;...
     4,4,4,4];
y = [5,5,5,5;...
     5,5,2,5;...
     5,5,5,5;...
     5,5,5,5];
mask = [0,0,0,0;...
        1,1,1,1;...
        0,0,0,0;...
        1,1,1,1];
When try perform this:
x=y*(mask==1)
Result is:
x =
    10    10    10    10
    10    10    10    10
    10    10    10    10
    10    10    10    10
Why?

Best Answer

(* performs matrix multiplication) perhaps you needed .* element wise multiplication
https://in.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
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