Mercurial > octave-nkf
view scripts/elfun/cosd.m @ 6239:82185e38eea8
[project @ 2007-01-10 22:53:58 by jwe]
author | jwe |
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date | Wed, 10 Jan 2007 22:53:59 +0000 |
parents | |
children | 98ee80702bca |
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## Copyright (C) 2006 David Bateman <dbateman@free.fr> ## ## This program 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 2 of the License, or ## (at your option) any later version. ## ## This program 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 this program; if not, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## -*- texinfo -*- ## @deftypefn {Function File} {} cosd (@var{x}) ## Compute the cosine of an angle in degrees. Returns zero in elements ## for which @code{(@var{x}-90)/180} is an integer. ## @seealso{cos, sind, tand, acosd, asind, atand} ## @end deftypefn function y = cosd (x) if (nargin != 1) print_usage (); endif I = x / 180; y = cos (I .* pi); I = I + 0.5; y(I == round (I) & finite (I)) = 0; endfunction %!error(cosd()) %!error(cosd(1,2)) %!assert(cosd(0:10:80),cos(pi*[0:10:80]/180),-10*eps) %!assert(cosd([0,180,360]) != 0) %!assert(cosd([90,270]) == 0)