how do I multiply two matrices

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Lawrence Lee
Lawrence Lee 2017-12-27
回答： KSSV 2017-12-27
Hi
a = [1,2,3;9,8,7] b = [5,8;8,7;9,4] I can't figure out how a*b = [48,34;172,156]?
thanks
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KSSV
KSSV 2017-12-27
It is basic...multiplying two matrices......are you aware of how to multiply two matrices?

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KSSV
KSSV 2017-12-27
a = [1,2,3;9,8,7] ;
b = [5,8;8,7;9,4] ;
% ab = [48,34;172,156] ;
[n,p] = size(a) ;
[p,m] = size(b) ;
C = zeros(n,m) ;
for i=1:n
for j=1:m
C(i,j)=0.0;
for k=1:p
C(i,j) = C(i,j)+a(i,k)*b(k,j);
end
end
end

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