increasing spdiags matrix at each iteration

Hi, I was wondering if someone has an idea how to horzcat at each iteration spdiag matrix? Thanks!!!

      ot = ones(N,1);
      N=50;
      for i=1:10
          if i=1
             A2 = spdiags([ot ot -ot -ot],[0 N -1 N-1],N,N*2);
          else
             %%desired result 
             %%for i=2 it should be A2 = horzcat(A2,A2);
             % for i=3 A2 = horzcat(A2,A2,A2) and so on;
          end
      end

Answer 1

[James Tursa]

A2 = repmat(A2,1,i);

But it seems to me that you may be running into memory problems with this, since A2 is recursively using the last A2 with repmat to build the new A2.