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author | alnd |
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date | Thu, 31 Jan 2002 06:11:53 +0000 |
parents | 6b33357c7561 |
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## Copyright (C) 1999 Peter Ekberg ## ## This program is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2, or (at your option) ## any later version. ## ## This program is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with this program; see the file COPYING. If not, write to the Free ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA ## 02111-1307, USA. ## usage: wilkinson (n) ## ## Return the Wilkinson matrix of order n. ## ## See also: hankel, vander, sylvester_matrix, hilb, invhilb, toeplitz ## hadamard, rosser, compan, pascal ## Author: Peter Ekberg ## (peda) function retval = wilkinson (n) if (nargin != 1) usage ("wilkinson (n)"); endif nmax = length (n); if ~(nmax == 1) error ("wilkinson: expecting scalar argument, found something else"); endif side = ones(n-1,1); center = abs(-(n-1)/2:(n-1)/2); retval = diag(side, -1) + diag(center) + diag(side, 1); endfunction