How can I faster matrix multiplication

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Paul
Paul 2020-2-26
编辑： KALYAN ACHARJYA 2020-2-27
Hello, first time here to ask
I have a 3 by 3 matrix, say G. And I also have a row vector, R.
What I need is finding R * G * R.'
but it is running very slow.
It used around 84.5s to have it call 26800 times.
Is that normal? Or how can I speed up since I have to do it inside a nested for loop?
I am currently using matlab R2019b version.
Thank you!
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James Tursa
James Tursa 2020-2-26
So R is 1x3 and changing each iteration?
Paul
Paul 2020-2-26
yes
G = [...; ...; ...]
for a=0 to 5
for b = 0 to 5
for c = 0 to 5
R= [a b c];
R*G*R.'
end
end
end

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2020-2-27
编辑：KALYAN ACHARJYA 2020-2-27
Is it simmilar?
G=[-0.00101584090085100 -0.0373729264800720 0.00786581385357300
-0.0373729264800720 -0.284509289498308 0.0752540345065320
0.00786581385357300 0.0752540345065320 -0.0158385837800100];
tic
result=cell(1,26800);
for i=1:26800
R=randi(10,[1,3]); % or Call the R here
result{i}=R*G*R';
end
toc
#
Elapsed time is 0.194492 seconds. (Measuring Elapsed Time Using tic and toc)

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