/usr/share/octave/packages/3.2/miscellaneous-1.0.11/units.m is in octave-miscellaneous 1.0.11-1.
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 63 | ## Copyright (C) 2005 Carl Osterwisch
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} units (@var{fromUnit}, @var{toUnit})
## @deftypefnx {Function File} {} units (@var{fromUnit}, @var{toUnit}, @var{x})
## Return the conversion factor from @var{fromUnit} to @var{toUnit} measurements.
##
## This is an octave interface to the @strong{GNU Units} program which comes
## with an annotated, extendable database defining over two thousand
## measurement units. See @code{man units} or
## @url{http://www.gnu.org/software/units} for more information.
## If the optional argument @var{x} is supplied, return that argument
## multiplied by the conversion factor. Nonlinear conversions
## such as Fahrenheit to Celsius are not currently supported. For example, to
## convert three values from miles per hour into meters per second:
##
## @example
## units ("mile/hr", "m/sec", [30, 55, 75])
## ans =
##
## 13.411 24.587 33.528
## @end example
## @end deftypefn
## Author: Carl Osterwisch <osterwischc@asme.org>
function y = units(fromUnit, toUnit, x)
if 2 > nargin || 3 < nargin || !ischar(fromUnit) || !ischar(toUnit)
usage('units(fromUnit, toUnit [, x])')
endif
[status, rawoutput] = system(sprintf('units "%s" "%s"', fromUnit, toUnit), 1);
(0 == status) || error([rawoutput,
'Verify that GNU units is installed in the current path.']);
i = index(rawoutput, "*");
j = index(rawoutput, "\n") - 1;
i && (i < j) || error('parsing units output "%s"', rawoutput);
exist("x", "var") || (x = 1);
eval(['y = x', rawoutput(i:j), ';'])
endfunction
%!demo
%! a.value = 100; a.unit = 'lb';
%! b.value = 50; b.unit = 'oz';
%! c.unit = 'kg';
%! c.value = units(a.unit, c.unit, a.value) + units(b.unit, c.unit, b.value)
%!assert( units("in", "mm"), 25.4 )
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