Mercurial > octave
view scripts/elfun/asech.m @ 29359:7854d5752dd2
maint: merge stable to default.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Wed, 10 Feb 2021 10:10:40 -0500 |
parents | 90fea9cc9caa 0a5b15007766 |
children | 76269aa97398 |
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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 {} {} asech (@var{x}) ## Compute the inverse hyperbolic secant of each element of @var{x}. ## @seealso{sech} ## @end deftypefn function y = asech (x) if (nargin < 1) print_usage (); endif y = acosh (1 ./ x); endfunction %!testif ; ! ismac () %! v = [0, pi*i]; %! x = [1, -1]; %! assert (asech (x), v, sqrt (eps)); %!xtest <*52627> %! ## Same test code as above, but intended only for test statistics on Mac. %! ## Mac trig/hyperbolic functions have huge tolerances. %! if (! ismac ()), return; endif %! v = [0, pi*i]; %! x = [1, -1]; %! assert (asech (x), v, sqrt (eps)); %!error <Invalid call> asech ()