What should I do if I want to repeat copies of a matrix into a 2-by-2 block arrangement?
For example:
A=1..4$2:2
#0 #1
-- --
1 3
2 4
I need to repeat it n times, the matrix should be
#0 #1 #2 #3
-- -- -- --
1 3 1 3
2 4 2 4
1 3 1 3
2 4 2 4
Any idea how to accomplish this without using loop?