/usr/share/octave/packages/signal-1.2.2/private/to_real.m is in octave-signal 1.2.2-1build1.
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 | ## Copyright (C) 2007 R.G.H. Eschauzier <reschauzier@yahoo.com>
##
## 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/>.
## Adapted by Carnë Draug on 2011 <carandraug+dev@gmail.com>
## This function is necessary for impinvar and invimpinvar of the signal package
## Round complex number to nearest real number
function p_out = to_real(p_in)
p_out = abs(p_in) .* sign(real(p_in));
endfunction
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