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OS/2 Shareware BBS: 10 Tools
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octave
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sech.m
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1999-12-24
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36 lines
## Copyright (C) 1996, 1997 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 2, 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, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## -*- texinfo -*-
## @deftypefn {Mapping Function} {} sech (@var{X})
## sech (X): compute the hyperbolic secant of X for each element of X
## @end deftypefn
## Author: jwe
function w = sech (z)
if (nargin != 1)
usage ("sech (z)");
endif
w = 1 ./ cosh(z);
endfunction