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MathGroup Archive 2001

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Re: Special Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28232] Re: Special Matrix
  • From: "Carl K. Woll" <carlw at u.washington.edu>
  • Date: Fri, 6 Apr 2001 01:52:43 -0400 (EDT)
  • Organization: University of Washington
  • References: <9ah5nq$ps0@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Yoram,

How about

PollackMatrix[n_]:=PadLeft[Table[1,{n-2},{n-2}],{n,n},0,{1,1}]

For example

In[4]:=
PollackMatrix[7]

Out[4]=
{{0, 0, 0, 0, 0, 0, 0},

  {0, 1, 1, 1, 1, 1, 0},

  {0, 1, 1, 1, 1, 1, 0},

  {0, 1, 1, 1, 1, 1, 0},

  {0, 1, 1, 1, 1, 1, 0},

  {0, 1, 1, 1, 1, 1, 0},

  {0, 0, 0, 0, 0, 0, 0}}

Carl Woll
Physics Dept
U of Washington

"Yoram Pollack" <syftech at saad.org.il> wrote in message
news:9ah5nq$ps0 at smc.vnet.net...
> 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
>
>
>




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