How to multiply matrices using for loop?

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Reinhardt RADING 2021-1-5

评论： Reinhardt RADING 2021-1-6

Hello there,

i would like to mutiply three matrices.

i have an array which has stored 100 different values of the three matrices. i.e

y1 =x.out(:,:,1); x1=x.db(1); w1=diag(fastexp(x1));

y2=x.out(:,:,2); x2=x.db(2); w2=diag(fastexp(x2));

. . .

y100=x.out(:,:,100); x100=x.db(100) w100=diag(fastexp(x100));

z=y1 * w1* y1' * y2 * w2 * y2' * y3 * w3 * y3' * .........................................* y100 * w100* y100'

Kindly assist.

Thanks in advance.

David Hill 2021-1-5

What are the sizes? What is fastexp()?

fastexp() is for calculating the exponential of x1.

y1 = 1x2

w1 = 2x2

y1' = 2x1

Stephen23 2021-1-5

编辑：Stephen23 2021-1-5

z = 1;
for k = 1:100
    y = x.out(:,:,k);
    w = diag(fastexp(x.db(k)));
    z = z * y * w * y';
end

This worked.

Your assistance was highly appreciated. Thanks

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