mirror of
https://github.com/lcn2/calc.git
synced 2025-08-19 01:13:27 +03:00
57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
NAME
|
|
cosh - hyperbolic cosine
|
|
|
|
SYNOPSIS
|
|
cosh(x [,eps])
|
|
|
|
TYPES
|
|
x real
|
|
eps nonzero real, defaults to epsilon()
|
|
|
|
return real
|
|
|
|
DESCRIPTION
|
|
Calculate the cosh of x to the nearest or next to nearest multiple of
|
|
epsilon, with absolute error less than .75 * abs(eps).
|
|
|
|
cosh(x) = (exp(x) + exp(-x))/2
|
|
|
|
EXAMPLE
|
|
> print cosh(1, 1e-5), cosh(1, 1e-10), cosh(1, 1e-15), cosh(1, 1e-20)
|
|
1.54308 1.5430806348 1.543080634815244 1.54308063481524377848
|
|
|
|
LIMITS
|
|
none
|
|
|
|
LINK LIBRARY
|
|
NUMBER *qcosh(NUMBER *x, NUMBER *eps)
|
|
|
|
SEE ALSO
|
|
sinh, tanh, sech, csch, coth, epsilon
|
|
|
|
## Copyright (C) 1999 Landon Curt Noll
|
|
##
|
|
## Calc is open software; you can redistribute it and/or modify it under
|
|
## the terms of the version 2.1 of the GNU Lesser General Public License
|
|
## as published by the Free Software Foundation.
|
|
##
|
|
## Calc 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 Lesser General
|
|
## Public License for more details.
|
|
##
|
|
## A copy of version 2.1 of the GNU Lesser General Public License is
|
|
## distributed with calc under the filename COPYING-LGPL. You should have
|
|
## received a copy with calc; if not, write to Free Software Foundation, Inc.
|
|
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
|
|
##
|
|
## @(#) $Revision: 29.2 $
|
|
## @(#) $Id: cosh,v 29.2 2000/06/07 14:02:33 chongo Exp $
|
|
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/cosh,v $
|
|
##
|
|
## Under source code control: 1994/03/19 01:40:28
|
|
## File existed as early as: 1994
|
|
##
|
|
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
|
|
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
|