/usr/share/calc/help/log is in apcalc-common 2.12.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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log - base 10 logarithm
SYNOPSIS
log(x [,eps])
TYPES
x nonzero real or complex
eps nonzero real, defaults to epsilon()
return real or complex
DESCRIPTION
Approximate the base 10 logarithm function of x by a multiple of
epsilon, the error having absolute value less than 0.75 * eps.
If n is a positive integer, log(x, 10^-n) will usually be correct
to the n-th decimal place.
EXAMPLE
; print log(10), log(100), log(1e10), log(1e500)
1 2 10 500
; print log(128), log(23209), log(2^17-19)
~2.10720996964786836649 ~4.36565642852838930424 ~5.11744696704937330414
; print log(2+3i, 1e-5)
~0.55696845725899964822+~0.42681936428109216144i
LIMITS
x != 0
eps > 0
LINK LIBRARY
NUMBER *qlog(NUMBER *x, NUMBER *eps)
COMPLEX *c_log(COMPLEX *x, NUMBER *eps)
SEE ALSO
ln
## Copyright (C) 2006 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.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: log,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/log,v $
##
## Under source code control: 2006/05/06 23:56:04
## File existed as early as: 2006
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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