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## Copyright (C) 1996 John W. Eaton
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: sylvester_matrix (k)
##
## Return the Sylvester matrix of order n = 2^k.
##
## See also: hankel, vander, hilb, invhilb, toeplitz
## Author: jwe
function retval = sylvester_matrix (k)
if (nargin != 1)
usage ("sylvester_matrix (n)");
endif
if (is_scalar (k))
if (k < 1)
retval = 1;
else
tmp = sylvester_matrix (k-1);
retval = [tmp, tmp; tmp, -tmp];
endif
else
error ("sylvester_matrix: expecting scalar argument");
endif
endfunction
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.