help to multiply matrices in succession

Hi,

I initialized this objects:

C = vpa(zeros(4, 4, N));
A = vpa(zeros(4,4,N));

where C is:

for i = 1:N

      C(:,:,i) = [(cos(theta(i))) (-sin(theta(i))).*(cos(alpha(i))) (sin(theta(i))).*(sin(alpha(i))) (a(i)).*(cos(theta(i)));

      (sin(theta(i))) (cos(theta(i))).*(cos(alpha(i))) (-cos(theta(i))).*(sin(alpha(i))) (a(i)).*(sin(theta(i)));

      0 sin(alpha(i)) cos(alpha(i)) d(i);
      0 0 0 1];
  end

Well, I need that

A(:,:,1)=C(:,:,1);

but elements:

A(:,:,2) ....... A(:,:,N) must be obtained as

A(:,:,2) = C(:,:,1) * C(:,:,2)
A(:,:,3) = C(:,:,1) * C(:,:,2) * C(:,:,3)
etc

....
A(:,:,N) = C(:,:,1) * C(:,:,2) * C(:,:,3) * ....* C(:,:,N)

some tips ?

Answer 1

[Matt Fig]

% For example:
C = randi(10,2,2,3)
A = cumprod(C,3)

Or perhaps you meant:

A(:,:,1) = C(:,:,1);
for ii = 2:size(C,3)
   A(:,:,ii) = A(:,:,ii-1)*C(:,:,ii);
end

[Matt Fig]

Marco comments:

But cumprod is not for matrix product, is it ?

[Matt Fig]

Hello Marco, did you see the second option?

[Marco]

Yes, thanks!!!