/usr/share/octave/packages/control-3.0.0/options.m is in octave-control 3.0.0-5.
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 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | ## Copyright (C) 2009-2015 Lukas F. Reichlin
##
## This file is part of LTI Syncope.
##
## LTI Syncope 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.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn{Function File} {@var{opt} =} options (@var{'key1'}, @var{value1}, @var{'key2'}, @var{value2}, @dots{})
## Create options struct @var{opt} from a number of key and value pairs.
## For use with order reduction and system identification functions.
## Option structs are a way to avoid typing the same key and value pairs
## over and over again.
##
## @strong{Inputs}
## @table @var
## @item key, property
## The name of the property.
## @item value
## The value of the property.
## @end table
##
## @strong{Outputs}
## @table @var
## @item opt
## Struct with fields for each key.
## @end table
##
## @strong{Example}
## @example
## @group
## octave:1> opt = options ("method", "spa", "tol", 1e-6)
## opt =
##
## scalar structure containing the fields:
##
## method = spa
## tol = 1.0000e-06
##
## @end group
## @end example
## @example
## @group
## octave:2> save filename opt
## octave:3> # save the struct 'opt' to file 'filename' for later use
## octave:4> load filename
## octave:5> # load struct 'opt' from file 'filename'
## @end group
## @end example
##
## @end deftypefn
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: November 2011
## Version: 0.1
function opt = options (varargin)
if (nargin == 0)
print_usage ();
endif
if (rem (nargin, 2))
error ("options: properties and values must come in pairs");
endif
## alternative: opt = struct (varargin{:});
key = reshape (varargin(1:2:end-1), [], 1);
val = reshape (varargin(2:2:end), [], 1);
opt = cell2struct (val, key, 1);
opt = orderfields (opt);
endfunction
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