/usr/share/octave/packages/interval-3.1.0/@infsup/private/decimalcompare.m is in octave-interval 3.1.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## 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 3 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 -*-
## @documentencoding UTF-8
## @deffun decimalcompare (@var{X}, @var{Y})
##
## Compare two decimal floating point numbers.
##
## The result is a negative number, if @code{@var{X} < @var{Y}};
## zero, if @code{@var{X} == @var{Y}}; a positive number,
## if @code{@var{X} > @var{Y}}.
##
## @seealso{str2decimal, double2decimal}
## @end deffun
## Author: Oliver Heimlich
## Created: 2014-09-29
function result = decimalcompare (x, y)
## Comparison with zero
if (isempty (x.m) ~= isempty (y.m))
if (y.s || ... # Y < 0
not (x.s || isempty (x.m))) # X > 0
result = 1;
else
result = -1;
endif
return
endif
## Different signs
if (x.s ~= y.s)
result = y.s - x.s;
return
endif
## Different exponents
if (x.e ~= y.e)
result = x.e - y.e;
if (x.s)
result .*= -1;
endif
return
endif
## Compare common mantissa places
for i = 1 : min (length (x.m), length (y.m))
if (x.m(i) ~= y.m(i))
result = x.m(i) - y.m(i);
if (x.s)
result .*= -1;
endif
return
endif
endfor
## Compare mantissa length. There is no need to inspect the digits, because the
## mantissa is normalized (no trailing zeroes).
result = length (x.m) - length (y.m);
if (x.s)
result .*= -1;
endif
endfunction
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