PROGRAMMING IN MATLAB. Write a function with the header: function [C ] = myMatMa

Question

PROGRAMMING IN MATLAB.

Write a function with the header: function [C ] = myMatMatProd(A, B),

which uses three nested for loops to multiply matrices A and B. If A is pxq and B is rxs, C will be pxs. If A and B are not compatible, the function should return an error code of -1.

Test Cases:

You may check your work against Matlab’s built in matrix multiplication.

For example,

>> A = rand(3,7);

>> B = rand(7,4);

>> C = A*B

C =

0.9509 1.9375 1.5620 1.2809

1.4532 1.2605 1.7815 1.3751

1.0587 1.4412 1.6304 1.1006

Explanation / Answer

function [C] = myMatMatProd(A,B)
[RA,CA] = size(A);
[RB,CB] = size(B);
if CA~=RB
C=-1;
error('Matrices incompatible for multiplication. Error Code : %d',-1);
end
C = zeros(RA,CB);
for row=1:RA
   for col = 1:CB
theSum=0;
for k= 1 : CA
theSum = theSum + A(row,k)*B(k,col);
end
C(row,col)=theSum;
end
end

end

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