matrix and vector multiplication without for loop

13 vues (au cours des 30 derniers jours)
Mohamed
Mohamed le 23 Nov 2013
Commenté : Harry MacDowel le 23 Nov 2013
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) ?

Réponses (2)

Roger Stafford
Roger Stafford le 23 Nov 2013

Azzi Abdelmalek
Azzi Abdelmalek le 23 Nov 2013
Modifié(e) : Azzi Abdelmalek le 23 Nov 2013
n=4;
m=3;
X=rand(m,n); % Example
Y=rand(m,1);
G=sum(bsxfun(@times,X,Y))'

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