1######################################################################## 2## 3## Copyright (C) 1995-2021 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 {} {} sinewave (@var{m}, @var{n}, @var{d}) 28## Return an @var{m}-element vector with @var{i}-th element given by 29## @code{sin (2 * pi * (@var{i}+@var{d}-1) / @var{n})}. 30## 31## The default value for @var{d} is 0 and the default value for @var{n} is 32## @var{m}. 33## @seealso{sinetone} 34## @end deftypefn 35 36function x = sinewave (m, n, d) 37 38 if (nargin > 0 && nargin < 4) 39 if (nargin < 3) 40 d = 0; 41 endif 42 if (nargin < 2) 43 n = m; 44 endif 45 x = sin (((1 : m) + d - 1) * 2 * pi / n); 46 else 47 print_usage (); 48 endif 49 50endfunction 51 52 53%!assert (sinewave (1), 0) 54%!assert (sinewave (1, 4, 1), 1) 55%!assert (sinewave (1, 12, 1), 1/2, 1e-6) 56%!assert (sinewave (1, 12, 2), sqrt (3)/2, 1e-6) 57%!assert (sinewave (1, 20, 1), (sqrt (5)-1)/4, 1e-6) 58%!assert (sinewave (1), sinewave (1, 1,0)) 59%!assert (sinewave (3, 4), sinewave (3, 4, 0)) 60 61%!error sinewave () 62