/usr/share/calc/help/mattrans 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.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | NAME
    mattrans - matrix transpose
SYNOPSIS
    matdim(m)
TYPES
    m		2-dimensional matrix
    return	2-dimensional matrix
DESCRIPTION
    Returns the matrix whose [i,j] element is the [j,1] element of m.
EXAMPLE
    ; mat A[2, 1:3] = {1,2,3,4,5,6}
    ; print mattrans(A)
    mat [1:3,2] (6 elements, 6 nonzero):
      [1,0] = 1
      [1,1] = 4
      [2,0] = 2
      [2,1] = 5
      [3,0] = 3
      [3,1] = 6
LIMITS
    none
LINK LIBRARY
    MATRIX *mattrans(MATRIX *m)
SEE ALSO
    mat, ismat, matdim, matmax, matmin, mattrace, matsum, matfill,
    det, inverse, isident, test, config, search, rsearch, reverse, copy,
    blkcpy, dp, cp, randperm, sort
## 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: mattrans,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/mattrans,v $
##
## Under source code control:	1995/10/25 04:03:46
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
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