matrix and vector multiplication without for loop
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Hi, I have 3 matrices "X" is m x n matrix and "Y" is m x 1 column vector, I want to multiply each column of X by the vector Y and calculate the sum of each multiplied column and put them in column vector "G" which is n x 1. Is there any way to do this without using for loops (vectorized solution) ?
回答（2 个）
Azzi Abdelmalek
2013-11-23
编辑：Azzi Abdelmalek
2013-11-23
n=4;
m=3;
X=rand(m,n); % Example
Y=rand(m,1);
G=sum(bsxfun(@times,X,Y))'
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2013-11-23
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