how to multiply matrix 2 * 2 if the elements of the matrix are row vectors.

fre=100:100:1000;

A=[1 9; 9 5]; % matrix 2*2

B=[1 0; cos(2.*pi.*fre) 0]; %matrix 2*2

C=A.*B;    % ?? how ?? or 

%C=A*B;      % ???

% i need know who the elements of C

disp(C);

Answer 1

[Honglei Chen]

B=[1 0; cos(2.*pi.*fre) 0];

will error out since it is not a 2x2 matrix. You will have to use a cell because fre is a vector. You may need to do it with cell arrays if this is what you want

a = rand(2)
b = {1 2;[3 5] 4}
c = cellfun(...
    @times,b,arrayfun(@(x)x,a,'UniformOutput',false),'UniformOutput',false)

Answer 2

[Andrei Bobrov]

fre=100:100:1000;
b = [1 0;0 0];
B = repmat(b,1,1,numel(fre));
B(2,1,:) = cos(2.*pi.*fre);
A=[1 9; 9 5];

C1 = bsxfun(@times,A,B);                                 % times

C2 = reshape(A*reshape(B,2,[]),size(A,1),size(A,2),[]);  % mtimes

Answer 3

[Ed]

thanks .. I will review the information