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annotate scripts/elfun/asec.m @ 19830:884e0c55d92c

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Fix complex compare operation for issorted (bug #44071). * Array-C.cc (nan_ascending_compare, nan_descending_compare): Fix typo where comparison was made between x and x rather than between x and y.
author Rik <rik@octave.org>
date Mon, 26 Jan 2015 15:32:49 -0800
parents d63878346099
children 4197fc428c7d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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d63878346099 maint: Update copyright notices for release.
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2013 John W. Eaton
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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 {Mapping Function} {} asec (@var{x})
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21 ## Compute the inverse secant in radians for each element of @var{x}.
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22 ## @seealso{sec, asecd}
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23 ## @end deftypefn
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25 ## Author: jwe
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27 function y = asec (x)
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29 if (nargin != 1)
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30 print_usage ();
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31 endif
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33 y = acos (1 ./ x);
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35 endfunction
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38 %!test
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39 %! rt2 = sqrt (2);
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40 %! rt3 = sqrt (3);
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41 %! v = [0, pi/6, pi/4, pi/3, 2*pi/3, 3*pi/4, 5*pi/6, pi];
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42 %! x = [1, 2*rt3/3, rt2, 2, -2, -rt2, -2*rt3/3, -1];
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43 %! assert (asec (x), v, sqrt (eps));
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45 %!error asec ()
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46 %!error asec (1, 2)
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