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diff --git a/octave_packages/control-2.3.52/__modred_ab09id__.m b/octave_packages/control-2.3.52/__modred_ab09id__.m
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+## Copyright (C) 2011 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 .
+
+## -*- texinfo -*-
+## @deftypefn{Function File} {[@var{Gr}, @var{info}] =} __modred_ab09id__ (@var{method}, @dots{})
+## Backend for btamodred and spamodred.
+## @end deftypefn
+
+## Author: Lukas Reichlin
+## Created: November 2011
+## Version: 0.1
+
+function [Gr, info] = __modred_ab09id__ (method, varargin)
+
+ if (nargin < 2)
+ print_usage ();
+ endif
+
+ if (method != "bta" && method != "spa")
+ error ("modred: invalid method");
+ endif
+
+ G = varargin{1};
+ varargin = varargin(2:end);
+
+ if (! isa (G, "lti"))
+ error ("%smodred: first argument must be an LTI system", method);
+ endif
+
+ if (nargin > 2) # *modred (G, ...)
+ if (is_real_scalar (varargin{1})) # *modred (G, nr)
+ varargin = horzcat (varargin(2:end), {"order"}, varargin(1));
+ endif
+ if (isstruct (varargin{1})) # *modred (G, opt, ...), *modred (G, nr, opt, ...)
+ varargin = horzcat (__opt2cell__ (varargin{1}), varargin(2:end));
+ endif
+ ## order placed at the end such that nr from *modred (G, nr, ...)
+ ## and *modred (G, nr, opt, ...) overrides possible nr's from
+ ## key/value-pairs and inside opt struct (later keys override former keys,
+ ## nr > key/value > opt)
+ endif
+
+ nkv = numel (varargin); # number of keys and values
+
+ if (rem (nkv, 2))
+ error ("%smodred: keys and values must come in pairs", method);
+ endif
+
+ [a, b, c, d, tsam, scaled] = ssdata (G);
+ [p, m] = size (G);
+ dt = isdt (G);
+
+ ## default arguments
+ alpha = __modred_default_alpha__ (dt);
+ av = bv = cv = dv = [];
+ jobv = 0;
+ aw = bw = cw = dw = [];
+ jobw = 0;
+ alphac = alphao = 0.0;
+ tol1 = 0.0;
+ tol2 = 0.0;
+ jobc = jobo = 0;
+ bf = true; # balancing-free
+ weight = 1;
+ equil = 0;
+ ordsel = 1;
+ nr = 0;
+
+ ## handle keys and values
+ for k = 1 : 2 : nkv
+ key = lower (varargin{k});
+ val = varargin{k+1};
+ switch (key)
+ case {"left", "output", "v"}
+ [av, bv, cv, dv, jobv] = __modred_check_weight__ (val, dt, p, []);
+
+ case {"right", "input", "w"}
+ [aw, bw, cw, dw, jobw] = __modred_check_weight__ (val, dt, [], m);
+
+ case {"order", "n", "nr"}
+ [nr, ordsel] = __modred_check_order__ (val, rows (a));
+
+ case "tol1"
+ tol1 = __modred_check_tol__ (val, "tol1");
+
+ case "tol2"
+ tol2 = __modred_check_tol__ (val, "tol2");
+
+ case "alpha"
+ alpha = __modred_check_alpha__ (val, dt);
+
+ case "method"
+ switch (tolower (val))
+ case "sr"
+ bf = false;
+ case "bfsr"
+ bf = true;
+ otherwise
+ error ("modred: '%s' is an invalid approach", val);
+ endswitch
+
+ case {"jobc", "gram-ctrb"}
+ jobc = __modred_check_gram__ (val, "gram-ctrb");
+
+ case {"jobo", "gram-obsv"}
+ jobo = __modred_check_gram__ (val, "gram-obsv");
+
+ case {"alphac", "alpha-ctrb"}
+ alphac = __modred_check_alpha_gram__ (val, "alpha-ctrb");
+
+ case {"alphao", "alpha-obsv"}
+ alphao = __modred_check_alpha_gram__ (val, "alpha-obsv");
+
+ case {"equil", "equilibrate", "equilibration", "scale", "scaling"}
+ scaled = __modred_check_equil__ (val);
+
+ otherwise
+ warning ("%smodred: invalid property name '%s' ignored", method, key);
+ endswitch
+ endfor
+
+ ## handle type of frequency weighting
+ if (jobv && jobw)
+ weight = 3; # 'B': both left and right weightings V and W are used
+ elseif (jobv)
+ weight = 1; # 'L': only left weighting V is used (W = I)
+ elseif (jobw)
+ weight = 2; # 'R': only right weighting W is used (V = I)
+ else
+ weight = 0; # 'N': no weightings are used (V = I, W = I)
+ endif
+
+ ## handle model reduction approach
+ if (method == "bta" && ! bf) # 'B': use the square-root Balance & Truncate method
+ job = 0;
+ elseif (method == "bta" && bf) # 'F': use the balancing-free square-root Balance & Truncate method
+ job = 1;
+ elseif (method == "spa" && ! bf) # 'S': use the square-root Singular Perturbation Approximation method
+ job = 2;
+ elseif (method == "spa" && bf) # 'P': use the balancing-free square-root Singular Perturbation Approximation method
+ job = 3;
+ else
+ error ("modred: invalid job option"); # this should never happen
+ endif
+
+
+ ## perform model order reduction
+ [ar, br, cr, dr, nr, hsv, ns] = slab09id (a, b, c, d, dt, equil, nr, ordsel, alpha, job, \
+ av, bv, cv, dv, \
+ aw, bw, cw, dw, \
+ weight, jobc, jobo, alphac, alphao, \
+ tol1, tol2);
+
+ ## assemble reduced order model
+ Gr = ss (ar, br, cr, dr, tsam);
+
+ ## assemble info struct
+ info = struct ("nr", nr, "ns", ns, "hsv", hsv);
+
+endfunction
+
+
+
+