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 > > > >