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## -*- texinfo -*-
## @deftypefn {} {} csch (@var{x})
## Compute the hyperbolic cosecant of each element of @var{x}.
## @seealso{acsch}
## @end deftypefn

function y = csch (x)

  if (nargin < 1)
    print_usage ();
  endif

  y = 1 ./ sinh (x);

endfunction


%!test
%! x = [pi/2*i, 3*pi/2*i];
%! v = [-i, i];
%! assert (csch (x), v, sqrt (eps));

%!error <Invalid call> csch ()