Vector Matrix multiplication (Row wise)

2015 9 16
4 个回答
回答已采纳
更新时间：2024 12 17
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0 个投票

Hi, I need to multiply each row of very large matrix with a row of corresponding vector. I don't really want to use for loop for that, i.e.,
N=15000;
L=rand(N,N); V=rand(N,1);
for i=1:1:N
L(i,:)=V(i)*L(i,:);
end
is it possible to do this in vectorized way?
Thank you
Erdem

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更多回答（3 个）

seif seif
seif seif 2018-1-26
编辑：seif seif 2018-1-26

1 个投票

I'd suggest a faster version than the above methods:
L = L .* v(:, ones(N,1));

2 个评论
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Noah Tang
Noah Tang 2019-10-28
Could you explain that why does this indexing trick work?
Sanders
Sanders 2024-12-17
Vladimir Kazei's version was significantly faster on my computer.

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