1######################################################################## 2## 3## Copyright (C) 1994-2021 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 {} {} acot (@var{x}) 28## Compute the inverse cotangent in radians for each element of @var{x}. 29## @seealso{cot, acotd} 30## @end deftypefn 31 32function y = acot (x) 33 34 if (nargin != 1) 35 print_usage (); 36 endif 37 38 y = atan (1 ./ x); 39 40endfunction 41 42 43%!test 44%! rt2 = sqrt (2); 45%! rt3 = sqrt (3); 46%! x = [rt3, 1, rt3/3, 0, -rt3/3, -1, -rt3]; 47%! v = [pi/6, pi/4, pi/3, pi/2, -pi/3, -pi/4, -pi/6]; 48%! assert (acot (x), v, sqrt (eps)); 49 50%!error acot () 51%!error acot (1, 2) 52