Re: Special Matrix
- To: mathgroup at smc.vnet.net
- Subject: [mg28240] Re: Special Matrix
- From: Erich Mueller <emuelle1 at uiuc.edu>
- Date: Fri, 6 Apr 2001 01:52:49 -0400 (EDT)
- Organization: University of Illinois at Urbana-Champaign
- References: <9ah5nq$ps0@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Here is one approach, Its probably not the fastest, but is relatively straightforward: Mat[n_] := (V = Array[1 &, n]; V[[1]] = 0; V[[n]] = 0; Outer[Times, V, V]) Typing Mat[3] returns {{0, 0, 0}, {0, 1, 0}, {0, 0, 0}} Erich On 5 Apr 2001, Yoram Pollack wrote: > Hello > I am trying to create a "n x n" matrix with "1" in every position exept in > first and last row, and first and last coulumn, where "0" is needed. In > other words: sqare matrix full of "1" sorounded by "0". > What will be the fastest and shortest way to do it? > > Thanks > Yoram > > > >