Mercurial > octave
view scripts/elfun/sec.m @ 23084:ef4d915df748
maint: Merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 23 Jan 2017 14:27:48 -0500 |
parents | 3a2b891d0b33 e9a0469dedd9 |
children | 092078913d54 |
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## Copyright (C) 1994-2016 John W. Eaton ## ## 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 ## <http://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 ## Author: jwe 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 sec () %!error sec (1, 2)