matlaboctave

Matrix Row size comparison with Vector item?

I have matrix [m x n] and vector [m], and I want to compare each row with the corresponding vector number, is there way to do this vectorized method ?

Solution

  • Use bsxfun: 

    % example data
M = rand(5, 3);
V = rand(5,1);

% for equality (==) : 
bsxfun(@eq, V, M);

% for greater-than (>) : 
bsxfun(@gt, V, M);

% for greater-than-or-equals (>=) : 
bsxfun(@ge, V, M);

    etc. The list of available functions is listed in help bsxfun.