Re: Lists and rules
- To: mathgroup at smc.vnet.net
- Subject: [mg66505] Re: Lists and rules
- From: "Scout" <Scout at nodomain.com>
- Date: Wed, 17 May 2006 03:29:53 -0400 (EDT)
- References: <e4bj1m$1b9$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"Thomas Schmelzer" <thomas.??? at balliol.ox.ac.uk> news:e4bj1m$1b9$1 at smc.vnet.net... > Experts, > I would like to produce a decent piece of code for one of my projects. > I am constructing a list of sets > > S_1, S_2 and S_3 > > where S_j = { m , T[[1,m]] == j, m running from 1 to 100} > > T[[1,*]] is a row vector containing only 1, 2 and 3. > > I could setup a for loop and work with append. I have done that, but I > believe this approach is neither efficient nor elegant. Any hints for a > newbie? > > Best, > Thomas > > > Hi Thomas, a glance at Table[] command in the Help browser could help you. Also make practice with this: Range[i_max] generates the list {1, 2, . , i_max} Table[expr, {i_max}] generates a list of i_max copies of expr Hope this helps, ~Scout~