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Re: Manipulating a matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59237] Re: Manipulating a matrix
  • From: "Nasser Abbasi" <nma at 12000.org>
  • Date: Wed, 3 Aug 2005 01:19:43 -0400 (EDT)
  • References: <dcmuig$glg$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Ramier" <wissam2 at online.fr> wrote in message 
news:dcmuig$glg$1 at smc.vnet.net...
>
>
> Hello everyone,
>
> I think that my question is rather simple and maybe I ought to go
> deeper into Mathematica book:
> I have a n x n matrix and I'd like to remove the first line and the
> first column in order to get the (n-1)x(n-1) matrix with the entries
> remaining. Is there a simple way to do that ?
>
> Perhaps my question is really simple or idiot but I've never used
> Mathematica before.
>
> Thanks a lot,
>
> Wissam

btw, It called a row, not a line.

There are many ways to do this. This is one possible way.

Let A be the matrix in question. type:
A = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}}
{nRow, nCol} = Dimensions[A];
c = A[[  Range[2, nRow] , Range[2, nCol]  ]]

now c contains the part of the matrix you wanted.

Nasser




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