octave: scripts/linear-algebra/issymmetric.m annotate

annotate scripts/linear-algebra/issymmetric.m @ 25224:1f1aef87e136

issymmetric.m: Fix calculation of skew matrices (bug in 0f98040552de). * issymmetric.m: Reshape comparison matrix into column vector before using any().

author	Rik <rik@octave.org>
date	Wed, 11 Apr 2018 21:50:38 -0700
parents	0f98040552de
children	a937ffe7dfd9

rev	line source
25054 6652d3823428 maint: Update copyright dates in all source files. John W. Eaton <jwe@octave.org> parents: 24534 diff changeset	1 ## Copyright (C) 1996-2018 John W. Eaton
9869 ecd750d1eabd move issymmetric & isdefinite to linear-algebra, create ishermitian Jaroslav Hajek <highegg@gmail.com> parents: 8920 diff changeset	2 ## Copyright (C) 2009 VZLU Prague
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	3 ##
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	4 ## This file is part of Octave.
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	5 ##
24534 194eb4bd202b maint: Update punctuation for GPL v3 license text. Rik <rik@octave.org> parents: 23220 diff changeset	6 ## Octave is free software: you can redistribute it and/or modify it
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	7 ## under the terms of the GNU General Public License as published by
24534 194eb4bd202b maint: Update punctuation for GPL v3 license text. Rik <rik@octave.org> parents: 23220 diff changeset	8 ## the Free Software Foundation, either version 3 of the License, or
22755 3a2b891d0b33 maint: Standardize Copyright formatting. Rik <rik@octave.org> parents: 22323 diff changeset	9 ## (at your option) any later version.
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	10 ##
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	11 ## Octave is distributed in the hope that it will be useful, but
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
22755 3a2b891d0b33 maint: Standardize Copyright formatting. Rik <rik@octave.org> parents: 22323 diff changeset	13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
3a2b891d0b33 maint: Standardize Copyright formatting. Rik <rik@octave.org> parents: 22323 diff changeset	14 ## GNU General Public License for more details.
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	15 ##
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	16 ## You should have received a copy of the GNU General Public License
7016 93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 6046 diff changeset	17 ## along with Octave; see the file COPYING. If not, see
24534 194eb4bd202b maint: Update punctuation for GPL v3 license text. Rik <rik@octave.org> parents: 23220 diff changeset	18 ## <https://www.gnu.org/licenses/>.
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	19
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	20 ## -- texinfo --
20852 516bb87ea72e 2015 Code Sprint: remove class of function from docstring for all m-files. Rik <rik@octave.org> parents: 20160 diff changeset	21 ## @deftypefn {} {} issymmetric (@var{A})
516bb87ea72e 2015 Code Sprint: remove class of function from docstring for all m-files. Rik <rik@octave.org> parents: 20160 diff changeset	22 ## @deftypefnx {} {} issymmetric (@var{A}, @var{tol})
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	23 ## @deftypefnx {} {} issymmetric (@var{A}, @qcode{"skew"})
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	24 ## @deftypefnx {} {} issymmetric (@var{A}, @qcode{"skew"}, @var{tol})
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	25 ## Return true if @var{A} is a symmetric or skew-symmetric matrix within the
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	26 ## tolerance specified by @var{tol}.
18921 d0d0858cfab1 doc: Match docstring variable names to function variable names for linear-algebra m-files. Rik <rik@octave.org> parents: 18799 diff changeset	27 ##
d0d0858cfab1 doc: Match docstring variable names to function variable names for linear-algebra m-files. Rik <rik@octave.org> parents: 18799 diff changeset	28 ## The default tolerance is zero (uses faster code).
20160 03b9d17a2d95 doc: Update more docstrings to have one sentence summary as first line. Rik <rik@octave.org> parents: 19697 diff changeset	29 ##
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	30 ## The type of symmetry to check may be specified with the additional input
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	31 ## @qcode{"nonskew"} (default) for regular symmetry or @qcode{"skew"} for
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	32 ## skew-symmetry.
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	33 ##
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	34 ## Background: A matrix is symmetric if the transpose of the matrix is equal
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	35 ## to the original matrix: @w{@acode{@var{A} == @var{A}.'}}. If a tolerance
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	36 ## is given then symmetry is determined by
18921 d0d0858cfab1 doc: Match docstring variable names to function variable names for linear-algebra m-files. Rik <rik@octave.org> parents: 18799 diff changeset	37 ## @code{norm (@var{A} - @var{A}.', Inf) / norm (@var{A}, Inf) < @var{tol}}.
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	38 ##
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	39 ## A matrix is skew-symmetric if the transpose of the matrix is equal to the
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	40 ## negative of the original matrix: @w{@acode{@var{A} == -@var{A}.'}}. If a
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	41 ## tolerance is given then skew-symmetry is determined by
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	42 ## @code{norm (@var{A} + @var{A}.', Inf) / norm (@var{A}, Inf) < @var{tol}}.
11431 0d9640d755b1 Improve docstrings for all isXXX functions. Rik <octave@nomad.inbox5.com> parents: 10711 diff changeset	43 ## @seealso{ishermitian, isdefinite}
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	44 ## @end deftypefn
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	45
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	46 ## Author: A. S. Hodel <scotte@eng.auburn.edu>
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	47 ## Created: August 1993
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	48 ## Adapted-By: jwe
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	49
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	50 function retval = issymmetric (A, skewopt = "nonskew", tol = 0)
9869 ecd750d1eabd move issymmetric & isdefinite to linear-algebra, create ishermitian Jaroslav Hajek <highegg@gmail.com> parents: 8920 diff changeset	51
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	52 if (nargin < 1 \|\| nargin > 3)
9869 ecd750d1eabd move issymmetric & isdefinite to linear-algebra, create ishermitian Jaroslav Hajek <highegg@gmail.com> parents: 8920 diff changeset	53 print_usage ();
ecd750d1eabd move issymmetric & isdefinite to linear-algebra, create ishermitian Jaroslav Hajek <highegg@gmail.com> parents: 8920 diff changeset	54 endif
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	55
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	56 if (nargin == 2)
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	57 ## Decode whether second argument is skewopt or tol
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	58 if (isnumeric (skewopt))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	59 tol = skewopt;
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	60 skewopt = "nonskew";
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	61 elseif (! ischar (skewopt))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	62 error ("issymmetric: second argument must be a non-negative scalar TOL, or one of the strings: 'skew' / 'nonskew'");
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	63 endif
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	64 endif
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	65
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	66 ## Validate inputs
18921 d0d0858cfab1 doc: Match docstring variable names to function variable names for linear-algebra m-files. Rik <rik@octave.org> parents: 18799 diff changeset	67 retval = (isnumeric (A) \|\| islogical (A)) && issquare (A);
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	68 if (! retval)
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	69 return;
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	70 endif
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	71
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	72 if (! (strcmp (skewopt, "skew") \|\| strcmp (skewopt, "nonskew")))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	73 error ("issymmetric: SKEWOPT must be 'skew' or 'nonskew'");
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	74 endif
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	75
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	76 if (! (isnumeric (tol) && isscalar (tol) && tol >= 0))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	77 error ("issymmetric: TOL must be a scalar >= 0");
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	78 endif
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	79
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	80 ## Calculate symmetry
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	81 if (strcmp (skewopt, "nonskew"))
9869 ecd750d1eabd move issymmetric & isdefinite to linear-algebra, create ishermitian Jaroslav Hajek <highegg@gmail.com> parents: 8920 diff changeset	82 if (tol == 0)
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	83 ## check for exact symmetry
25224 1f1aef87e136 issymmetric.m: Fix calculation of skew matrices (bug in 0f98040552de). Rik <rik@octave.org> parents: 25223 diff changeset	84 retval = ! any ((A != A.')(:));
9869 ecd750d1eabd move issymmetric & isdefinite to linear-algebra, create ishermitian Jaroslav Hajek <highegg@gmail.com> parents: 8920 diff changeset	85 else
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	86 norm_x = norm (A, Inf);
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	87 retval = norm_x == 0 \|\| norm (A - A.', Inf) / norm_x <= tol;
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	88 endif
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	89 else
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	90 ## skew symmetry
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	91 if (tol == 0)
25224 1f1aef87e136 issymmetric.m: Fix calculation of skew matrices (bug in 0f98040552de). Rik <rik@octave.org> parents: 25223 diff changeset	92 retval = ! any ((A != -A.')(:));
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	93 else
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	94 norm_x = norm (A, Inf);
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	95 retval = norm_x == 0 \|\| norm (A + A.', Inf) / norm_x <= tol;
4026 8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	96 endif
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	97 endif
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	98
8cb8eff3f44c [project @ 2002-08-09 06:54:46 by jwe] jwe parents: diff changeset	99 endfunction
7265 7da4a5262e2e [project @ 2007-12-06 19:16:47 by jwe] jwe parents: 7017 diff changeset	100
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	101
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	102 %!assert (issymmetric (1))
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	103 %!assert (! issymmetric ([1, 2]))
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	104 %!assert (issymmetric ([]))
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	105 %!assert (issymmetric ([1, 2; 2, 1]))
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	106 %!assert (issymmetric ([1, 2.1; 2, 1.1], 0.2))
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	107 %!assert (issymmetric ([1, 2i; 2i, 1]))
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	108 %!assert (issymmetric (speye (100)))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	109 %!assert (issymmetric (logical (eye (2))))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	110 %!assert (issymmetric ([0, 2; -2, 0], "skew"))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	111 %!assert (! issymmetric ([0, 2; -2, eps], "skew"))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	112 %!assert (issymmetric ([0, 2; -2, eps], "skew", eps))
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	113
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	114 %!assert (! (issymmetric ("test")))
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	115 %!assert (! (issymmetric ("t")))
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	116 %!assert (! (issymmetric (["te"; "et"])))
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	117 %!assert (! issymmetric ({1}))
7265 7da4a5262e2e [project @ 2007-12-06 19:16:47 by jwe] jwe parents: 7017 diff changeset	118 %!test
7da4a5262e2e [project @ 2007-12-06 19:16:47 by jwe] jwe parents: 7017 diff changeset	119 %! s.a = 1;
14868 5d3a684236b0 maint: Use Octave coding conventions for cuddling parentheses in scripts directory Rik <octave@nomad.inbox5.com> parents: 14363 diff changeset	120 %! assert (! issymmetric (s));
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	121
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	122 ## Test input validation
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	123 %!error issymmetric ()
25223 0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	124 %!error issymmetric (1,2,3,4)
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	125 %!error <second argument must be> issymmetric (1, {"skew"})
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	126 %!error <SKEWOPT must be 'skew' or 'nonskew'> issymmetric (1, "foobar")
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	127 %!error <SKEWOPT must be 'skew' or 'nonskew'> issymmetric (1, "foobar")
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	128 %!error <TOL must be a scalar .= 0> issymmetric (1, "skew", {1})
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	129 %!error <TOL must be a scalar .= 0> issymmetric (1, "skew", [1 1])
0f98040552de issymetric.m; Overhaul function and expand to check skew-symmetry (bug #53556). Rik <rik@octave.org> parents: 25054 diff changeset	130 %!error <TOL must be a scalar .= 0> issymmetric (1, -1)

Mercurial > octave

annotate scripts/linear-algebra/issymmetric.m @ 25224:1f1aef87e136