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annotate scripts/linear-algebra/ishermitian.m @ 17526:05bed3576091

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Fix int16 type comments
author LYH <lyh.kernel@gmail.com>
date Fri, 27 Sep 2013 04:18:59 +0800
parents 5d3a684236b0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1996-2012 John W. Eaton
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2 ## Copyright (C) 2009 VZLU Prague
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} ishermitian (@var{x})
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22 ## @deftypefnx {Function File} {} ishermitian (@var{x}, @var{tol})
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23 ## Return true if @var{x} is Hermitian within the tolerance specified by
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24 ## @var{tol}.
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25 ## The default tolerance is zero (uses faster code).
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26 ## Matrix @var{x} is considered symmetric if
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27 ## @code{norm (@var{x} - @var{x}', Inf) / norm (@var{x}, Inf) < @var{tol}}.
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28 ## @seealso{issymmetric, isdefinite}
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29 ## @end deftypefn
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30
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31 ## Author: A. S. Hodel <scotte@eng.auburn.edu>
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32 ## Created: August 1993
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33 ## Adapted-By: jwe
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34
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35 function retval = ishermitian (x, tol = 0)
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36
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37 if (nargin < 1 || nargin > 2)
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38 print_usage ();
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39 endif
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40
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41 retval = isnumeric (x) && issquare (x);
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42 if (retval)
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43 if (tol == 0)
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44 retval = all ((x == x')(:));
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45 else
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46 norm_x = norm (x, inf);
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47 retval = norm_x == 0 || norm (x - x', inf) / norm_x <= tol;
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48 endif
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49 endif
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50
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51 endfunction
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52
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53
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54 %!assert (ishermitian (1))
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55 %!assert (! ishermitian ([1, 2]))
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56 %!assert (ishermitian ([]))
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57 %!assert (ishermitian ([1, 2; 2, 1]))
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58 %!assert (! ishermitian ("test"))
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59 %!assert (ishermitian ([1, 2.1; 2, 1.1], 0.2))
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60 %!assert (ishermitian ([1, -2i; 2i, 1]))
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61 %!assert (! ishermitian ("t"))
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62 %!assert (! ishermitian (["te"; "et"]))
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63
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64 %!test
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65 %! s.a = 1;
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66 %! assert (! ishermitian (s));
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67
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68 %!error ishermitian ([1, 2; 2, 1], 0, 0)
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69 %!error ishermitian ()
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70