Mercurial > octave
view scripts/elfun/sec.m @ 30249:bc22395f60fa
maint: merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 22 Oct 2021 12:05:59 -0400 |
parents | 7854d5752dd2 |
children | 9ed1cf9e446e 796f54d4ddbf |
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######################################################################## ## ## Copyright (C) 1994-2021 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 {} {} sec (@var{x}) ## Compute the secant for each element of @var{x} in radians. ## @seealso{asec, secd, sech} ## @end deftypefn function y = sec (x) if (nargin < 1) print_usage (); endif y = 1 ./ cos (x); endfunction %!test %! rt2 = sqrt (2); %! rt3 = sqrt (3); %! x = [0, pi/6, pi/4, pi/3, 2*pi/3, 3*pi/4, 5*pi/6, pi]; %! v = [1, 2*rt3/3, rt2, 2, -2, -rt2, -2*rt3/3, -1]; %! assert (sec (x), v, sqrt (eps)); %!error <Invalid call> sec ()