/usr/share/calc/help/indices is in apcalc-common 2.12.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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indices - indices for specified matrix or association element
SYNOPSIS
indices(V, index)
TYPES
V matrix or association
index integer
return list with up to 4 elements
DESCRIPTION
For 0 <= index < size(V), indices(V, index) returns list(i_0, i_1, ...)
for which V[i_0, i_1, ...] is the same lvalue as V[[index]].
For other values of index, a null value is returned.
This function can be useful for determining those elements for which
the indices satisfy some condition. This is particularly so for
associations since these have no simple relation between the
double-bracket index and the single-bracket indices, which may be
non-integer numbers or strings or other types of value. The
information provided by indices() is often required after the use
of search() or rsearch() which, when successful, return the
double-bracket index of the item found.
EXAMPLE
; mat M[2,3,1:5]
; indices(M, 11)
list (3 elements, 2 nonzero):
[[0]] = 0
[[1]] = 2
[[2]] = 2
; A = assoc();
; A["cat", "dog"] = "fight";
; A[2,3,5,7] = "primes";
; A["square", 3] = 9
; indices(A, search(A, "primes"))
list (4 elements, 4 nonzero):
[[0]] = 2
[[1]] = 3
[[2]] = 5
[[3]] = 7
LIMITS
abs(index) < 2^31
LINK LIBRARY
LIST* associndices(ASSOC *ap, long index)
LIST* matindices(MATRIX *mp, long index)
SEE ALSO
assoc, mat
## Copyright (C) 1999-2006 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: indices,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/indices,v $
##
## Under source code control: 1999/11/16 08:02:03
## File existed as early as: 1999
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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