cell to double problem for loop includes cellarrays.

A=[1 1;2 2;3 3;4 4;5 5;6 6;7 7;8 8;9 9;10 10;11 11;12 12;13 13]
B=[3;4;3;3]
C=[1;2;3;4;5;6;7;8;9;10;11;12;13]
for k = 1 : length(B)
  if k == 1
    row1 = 1
  else
    row1 = 1 + sum(B(1:k-1))
  end
  row2 = sum(B(1:k))
   x{k} = A(row1:row2, :)
        y{k}=  C(row1:row2, 1)
end
%I wanna add (inv(x'*x)*x'*y) for each k into loop. Problem is x and y are cell in the loop.

Answer 1

[Azzi Abdelmalek]

Replace x by x{k}

inv(x{k}'*x{k})*x{k}'*y{k}

Answer 2

[Andrei Bobrov]

xc = mat2cell(A,B,size(A,2));
yc = mat2cell(C,B,size(C,2));
out = cellfun(@(a,b)(a'*a)\a'*b,xc,yc,'un',0);