Matrix replications and form third matrix

Hi everyone

I have two matrices A with size of (144x40) and B with same size.What I am trying to do is actually I want to take the square of them and add to form another matrix which is just a row or column with size of 1600.

A=144x400 B=144x1600.

D=A.^2+B.^2 .

So this D must be a column or row matrix with size of 1600x1 or 1x1600.

I have made a function

function D = repc(in,M,N)

D = in(repmat(1:size(in,1),M,1),repmat(1:size(in,2),N,1));

end

But when I compute A its size becomes double 20736x1600 and I cannot compute B because of out of memmory error

[Matt J]

Initially, you said that both A and B are 144x40. Later in your post, both matrices change size, to 144x400 for A and 144x1600 for B. In neither case is it clear what operation you would do to produce a length 1600 vector.

Please rephrase more clearly and with consistent information about size(A) and size(B).

[Algorithms Analyst]

I am sorry it is my mistake.......it is 114*40

Answer 1

[Thorsten]

 A = rand(144, 400);
 B = rand(144, 1600);
 A(size(B, 1), size(B, 2)) = 0;

 D = A.^2 + B.^2;
 size(D)