MATLAB: Matrix manipulation, maybe repmat

Question

I have a huge matrix, just to make the case simple

Say I have a =

     1     4     7    10
     2     5     8    11

And I would like to get: a =

     1     4     7    10
     1     4     7    10
     2     5     8    11
     2     5     8    11

Is there a smart way of doing that(without loop)?

Thanks in advance!!

Answer 1

Dynamic version of the solution proposed by proecsm:

n = 2;
idx = repmat(1:size(a,1),n,1);
b = a(idx(:),:)

or

kron(A,ones(n,1))

or

http://www.mathworks.com/matlabcentral/fileexchange/24536-expand