Mercurial > octave
view scripts/elfun/cosd.m @ 31248:8b75954a4670
delaunayn: adjust node ordering for positive outward normal vectors (bug #53397)
* delaunayn.m: Check sign of simplex volume, flip node order for negative
volumes to ensure positive (outward-pointing) normal vectors. Add BISTs to
check for positive volumes.
* etc/News.8.md: Append function improvement note to delaunayn change
paragraph under General Improvements.
author | Nicholas R. Jankowski <jankowski.nicholas@gmail.com> |
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date | Thu, 29 Sep 2022 23:09:05 -0400 |
parents | 83f9f8bda883 |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 2006-2022 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 {} {@var{y} =} cosd (@var{x}) ## Compute the cosine for each element of @var{x} in degrees. ## ## The function is more accurate than @code{cos} for large values of @var{x} ## and for multiples of 90 degrees (@code{@var{x} = 90 + 180*n} with n an ## integer) where @code{cosd} returns 0 rather than a small value on the order ## of eps. ## @seealso{acosd, cos} ## @end deftypefn function y = cosd (x) if (nargin < 1) print_usage (); endif if (! isnumeric (x)) error ("cosd: X must be numeric"); endif ## Advance phase by 90 degrees to transform sin to cos and use sind(). y = sind (x + 90); endfunction %!assert (cosd (10:20:360), cos ([10:20:360] * pi/180), 5*eps) %!assert (cosd ([-270, -90, 90, 270]) == 0) %!assert (cosd ([-360, -180, 0, 180, 360]), [1, -1, 1, -1, 1]) %!assert (cosd ([-Inf, NaN, +Inf, 0]), [NaN, NaN, NaN, 1]) %!assert (cosd (+23) == cosd (-23)) %!assert (cosd (1e6), 0.17364817766693033, 5*eps) %!assert (cosd (90 + 180i), -i*sinh (pi)) %!assert (cosd (1e6 + 180i), 2.01292156189451577 + 11.3732880565446539i, -eps) %!error <Invalid call> cosd () %!error <X must be numeric> cosd ("abc")