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author | Markus Mützel <markus.muetzel@gmx.de> |
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date | Fri, 19 Aug 2022 08:54:05 +0200 |
parents | 5d3faba0342e |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 1999-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 3 of the License, 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, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{R} =} rosser () ## Return the @nospell{Rosser} matrix. ## ## This is a difficult test case used to evaluate eigenvalue algorithms. ## @seealso{wilkinson, eig} ## @end deftypefn function R = rosser () R = [611, 196, -192, 407, -8, -52, -49, 29; 196, 899, 113, -192, -71, -43, -8, -44; -192, 113, 899, 196, 61, 49, 8, 52; 407, -192, 196, 611, 8, 44, 59, -23; -8, -71, 61, 8, 411, -599, 208, 208; -52, -43, 49, 44, -599, 411, 208, 208; -49, -8, 8, 59, 208, 208, 99, -911; 29, -44, 52, -23, 208, 208, -911, 99]; endfunction %!assert (size (rosser ()), [8,8]) %!assert (rosser ()([1, end]), [611, 99]) %!error rosser (1)