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diff --git a/octave_packages/control-2.3.52/@frd/__d2c__.m b/octave_packages/control-2.3.52/@frd/__d2c__.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 <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## Convert the discrete FRD object into its continuous-time equivalent.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: September 2011
+## Version: 0.1
+
+function sys = __d2c__ (sys, tsam, method = "zoh")
+
+  error ("frd: d2c: conversion not possible");
+
+  ## NOTE: changing just the sampling time wouldn't make sense here
+
+endfunction
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