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1 ## Copyright (C) 1999, 2006, 2007 Peter Ekberg |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} rosser () |
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21 ## |
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22 ## Returns the Rosser matrix. This is a difficult test case used to test |
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23 ## eigenvalue algorithms. |
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24 ## |
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25 ## @seealso{hankel, vander, sylvester_matrix, hilb, invhilb, toeplitz |
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26 ## hadamard, wilkinson, compan, pascal} |
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27 ## @end deftypefn |
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28 |
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29 ## Author: Peter Ekberg |
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30 ## (peda) |
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31 |
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32 function retval = rosser () |
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33 |
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34 if (nargin != 0) |
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35 print_usage (); |
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36 endif |
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37 |
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38 retval = [611, 196, -192, 407, -8, -52, -49, 29; |
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39 196, 899, 113, -192, -71, -43, -8, -44; |
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40 -192, 113, 899, 196, 61, 49, 8, 52; |
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41 407, -192, 196, 611, 8, 44, 59, -23; |
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42 -8, -71, 61, 8, 411, -599, 208, 208; |
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43 -52, -43, 49, 44, -599, 411, 208, 208; |
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44 -49, -8, 8, 59, 208, 208, 99, -911; |
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45 29, -44, 52, -23, 208, 208, -911, 99]; |
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46 endfunction |
