/usr/share/calc/help/inverse 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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inverse - inverse of value
SYNOPSIS
inverse(x)
TYPES
If x is an object of type xx, the function xx_inv has to have
been defined; any conditions on x and the nature of the returned
value will depend on the definition of xx_inv.
For non-object x:
x nonzero number (real or complex) or nonsingular matrix
return number or matrix
DESCRIPTION
For real or complex x, inverse(x) returns the value of 1/x.
If x is a nonsingular n x n matrix and its elements are numbers or
objects for which the required arithmetic operations are defined,
inverse(x) returns the matrix m for which m * x = x * m = the unit
n x n matrix. The inverse m will have the same index limits as x.
EXAMPLE
; print inverse(5/4), inverse(-2/7), inverse(3 + 4i)
.8 -3.5 .12-.16i
; mat A[2,2] = {2,3,5,7}
; print inverse(A)
mat [2,2] (4 elements, 4 nonzero):
[0,0] = -7
[0,1] = 3
[1,0] = 5
[1,1] = -2
LIMITS
none
LINK LIBRARY
void invertvalue(VALUE *x, VALUE *vres)
NUMBER *qinv(NUMBER *x)
COMPLEX *c_inv(COMPLEX *x)
MATRIX *matinv(MATRIX *x)
SEE ALSO
## 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.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: inverse,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/inverse,v $
##
## Under source code control: 1996/03/12 23:10:01
## File existed as early as: 1996
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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