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## Copyright (C) 1994-2015 John W. Eaton
##
## 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
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Mapping Function} {} coth (@var{x})
## Compute the hyperbolic cotangent of each element of @var{x}.
## @seealso{acoth}
## @end deftypefn
## Author: jwe
function y = coth (x)
if (nargin != 1)
print_usage ();
endif
y = 1 ./ tanh (x);
endfunction
%!test
%! x = [pi/2*i, 3*pi/2*i];
%! v = [0, 0];
%! assert (coth (x), v, sqrt (eps));
%!error coth ()
%!error coth (1, 2)
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