matrix and vector multiplication without for loop

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Mohamed
Mohamed 2013-11-23
评论： Harry MacDowel 2013-11-23
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) ?

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回答（2 个）

Roger Stafford
Roger Stafford 2013-11-23
G = X.'*Y;
Azzi Abdelmalek
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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