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diff --git a/octave_packages/control-2.3.52/@lti/set.m b/octave_packages/control-2.3.52/@lti/set.m
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+## Copyright (C) 2009, 2010, 2012   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} set (@var{sys})
+## @deftypefnx {Function File} set (@var{sys}, @var{"property"}, @var{value}, @dots{})
+## @deftypefnx {Function File} {@var{retsys} =} set (@var{sys}, @var{"property"}, @var{value}, @dots{})
+## Set or modify properties of LTI objects.
+## If no return argument @var{retsys} is specified, the modified LTI object is stored
+## in input argument @var{sys}.  @command{set} can handle multiple properties in one call:
+## @code{set (sys, 'prop1', val1, 'prop2', val2, 'prop3', val3)}.
+## @code{set (sys)} prints a list of the object's property names.
+## @end deftypefn
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2009
+## Version: 0.4
+
+function retsys = set (sys, varargin)
+
+  if (nargin == 1)       # set (sys), sys = set (sys)
+
+    [props, vals] = __property_names__ (sys);
+    nrows = numel (props);
+
+    str = strjust (strvcat (props), "right");
+    str = horzcat (repmat ("   ", nrows, 1), str, repmat (":  ", nrows, 1), strvcat (vals));
+
+    disp (str);
+
+    if (nargout != 0)    # function sys = set (sys, varargin)
+      retsys = sys;      # would lead to unwanted output when using
+    endif                # set (sys)
+
+  else                   # set (sys, "prop1", val1, ...), sys = set (sys, "prop1", val1, ...)
+
+    if (rem (nargin-1, 2))
+      error ("lti: set: properties and values must come in pairs");
+    endif
+
+    [p, m] = size (sys);
+
+    for k = 1 : 2 : (nargin-1)
+      prop = lower (varargin{k});
+      val = varargin{k+1};
+
+      switch (prop)
+        case {"inname", "inputname"}
+          sys.inname = __adjust_labels__ (val, m);
+
+        case {"outname", "outputname"}
+          sys.outname = __adjust_labels__ (val, p);
+
+        case {"tsam", "ts"}
+          if (issample (val, -1))
+            sys.tsam = val;
+            warning ("lti: set: use the editing of property '%s' with caution", prop);
+            warning ("          it may lead to corrupted models");
+          else
+            error ("lti: set: invalid sampling time");
+          endif
+          ## TODO: use of c2d, d2c and d2d if tsam changes?
+
+        case "name"
+          if (ischar (val))
+            sys.name = val;
+          else
+            error ("lti: set: property 'name' requires a string");
+          endif
+
+        case "notes"
+          if (iscellstr (val))
+            sys.notes = val;
+          elseif (ischar (val))
+            sys.notes = {val};
+          else
+            error ("lti: set: property 'notes' requires string or cell of strings");
+          endif
+
+        case "userdata"
+          sys.userdata = val;
+
+        otherwise
+          sys = __set__ (sys, prop, val);
+      endswitch
+    endfor
+
+    if (nargout == 0)    # set (sys, "prop1", val1, ...)
+      assignin ("caller", inputname (1), sys);
+    else                 # sys = set (sys, "prop1", val1, ...)
+      retsys = sys;
+    endif
+
+  endif
+
+endfunction
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