1######################################################################## 2## 3## Copyright (C) 2006-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {} sind (@var{x}) 28## Compute the sine for each element of @var{x} in degrees. 29## 30## Returns zero for elements where @code{@var{x}/180} is an integer. 31## @seealso{asind, sin} 32## @end deftypefn 33 34function y = sind (x) 35 36 if (nargin != 1) 37 print_usage (); 38 endif 39 40 I = x / 180; 41 y = sin (I .* pi); 42 y(I == fix (I) & isfinite (I)) = 0; 43 44endfunction 45 46 47%!assert (sind (10:10:90), sin (pi*[10:10:90]/180), -10*eps) 48%!assert (sind ([0, 180, 360]) == 0) 49%!assert (sind ([90, 270]) != 0) 50 51%!error sind () 52%!error sind (1, 2) 53