Mercurial > octave
view scripts/special-matrix/vander.m @ 1315:611d403c7f3d
[project @ 1995-06-25 19:56:32 by jwe]
author | jwe |
---|---|
date | Sun, 25 Jun 1995 19:56:32 +0000 |
parents | 3f257ab07921 |
children | 5d29638dd524 |
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# Copyright (C) 1993, 1994, 1995 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. function retval = vander (c) # usage: vander (c) # # Return the Vandermonde matrix whose next to last column is c. # # See also: hankel, hadamard, hilb, invhilb, toeplitz if (nargin != 1) usage ("vander (c)"); endif nr = rows (c); nc = columns (c); if (nr == 1 && nc == 1) retval = 1; elseif (nr == 1 || nc == 1) n = length (c); if (n > 0) retval = zeros (n, n); for i = 1:n tmp = c(i); for j = 1:n retval (i, j) = tmp ^ (n - j); endfor endfor endif else error ("vander: argument must be a vector"); endif endfunction