MATLAB: How to multiply two matrices

Question

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

Answer 1

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