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MathGroup Archive 2001

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Re: Special Matrix

  • To: mathgroup at
  • Subject: [mg28233] Re: [mg28217] Special Matrix
  • From: Mianlai Zhou <lailai at>
  • Date: Fri, 6 Apr 2001 01:52:44 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Hello, I think the following line is a very short also quite elegant way
to realize it:

Table[ UnitStep[i-2, j-2, n-i-1, n-j-1], {i, n}, {j, n} ]

Good Luck!

On Thu, 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

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