MATLAB: How to multiply two matrices with nested for loops

arraymatrixmultiple

How can I do that with two matrices with any dimensions that can multiply ? Thank you

Best Answer

A=rand(n,p);
B=rand(p,m);
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

Best wishes

Torsten.

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% test data
A = randi(10,3,4) 
B = cumsum(ones(size(A))) 
% engine
C = A(2:end,:) .* B(1:end-1,:)  % C(i,j) = A(i+1,j) * B(i,j)

MATLAB: How to multiply two matrices

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

Best Answer

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