cscd.m

JAVA 数学程序库 提供常规的数值计算程序包

## Copyright (C) 2006 David Bateman <[e-mail]>
##
## This program 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 2 of the License, or
## (at your option) any later version.
##
## This program 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 this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

## -*- texinfo -*-
## @deftypefn {Function File} {} cscd (@var{x})
## Compute the cosecant of an angle in degrees.
## @seealso{csc, secd, sind, cosd}
## @end deftypefn

function y = cscd (x)
  if (nargin != 1)
    print_usage ();
  endif
  y = 1 ./ sind (x);
endfunction

%!error(cscd())
%!error(cscd(1,2))
%!assert(cscd(10:10:90),csc(pi*[10:10:90]/180),-10*eps)
%!assert(cscd([0,180,360]) == Inf)
%!assert(cscd([90,270]) != Inf)

/*
@GROUP
trigonometric
@SYNTAX
angle = cscd(value)
@DOC
.
@EXAMPLES
<programlisting>
</programlisting>
@NOTES
@SEE
cos, acosh, sin, asin, asinh
*/