opposite of partition
- To: mathgroup at smc.vnet.net
- Subject: [mg57539] opposite of partition
- From: Guy Israeli <guyi1 at netvision.net.il>
- Date: Tue, 31 May 2005 05:00:45 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
How do I do the opposite of partition quickly?
for example:
l1= {{a, b, c, d, e}, {f, g, h, i, j}, {k, l, m, n, o}, {p, q, r, s, t}, {u,
v, w,
x, y}}
and then if I partition it to blocks will result in
{{{{a, b}, {f, g}}, {{c, d}, {h, i}}}, {{{k, l}, {p, q}}, {{m, n}, {r, s}}}}
flattening it won't help, and its messy to do it by taking all first lines
of the blocks, then second..
How can I do it quickly?
Thanks,
Guy