matlab - How can I divide columns of a matrix by elements of a vector, element-wise? -


given matrix , vector

a = [ 1 2; 2 4 ]; v = [ 2 4 ];

how can divide each column of matrix respective element of vector? following matrix should be

[ 1/2 2/4; 2/2 4/4 ]

basically want apply column-wise operation, operands each column stored in separate vector.

you should use combination of rdivide , bsxfun:

a = [ 1 2; 2 4 ]; v = [ 2 4 ]; b = bsxfun(@rdivide, a, v);

rdivide takes care of per element division, while bsxfun makes sure dimensions add up. can achieve same result like

b = ./ repmat(v, size(a,1), 1)

however, using repmat results in increased memory usage, why bsxfun solution preferable.


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