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annotate scripts/control/system/sysgettype.m @ 7156:77de8319c337 ss-2-9-17

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[project @ 2007-11-10 06:16:59 by jwe]
author jwe
date Sat, 10 Nov 2007 06:17:00 +0000
parents f084ba47812b
children
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1 ## Copyright (C) 1998, 2000, 2002, 2003, 2004, 2005, 2007
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2 ## Auburn University. All rights reserved.
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} sysgettype (@var{sys})
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22 ## return the initial system type of the system
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23 ##
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24 ## @strong{Input}
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25 ## @table @var
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26 ## @item sys
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27 ## System data structure.
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28 ## @end table
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29 ##
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30 ## @strong{Output}
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31 ## @table @var
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32 ## @item systype
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33 ## String indicating how the structure was initially
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34 ## constructed. Values: @code{"ss"}, @code{"zp"}, or @code{"tf"}.
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35 ## @end table
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36 ##
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37 ## @acronym{FIR} initialized systems return @code{systype="tf"}.
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38 ## @end deftypefn
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39
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40 function systype = sysgettype (sys)
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41
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42 if (nargin != 1)
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43 print_usage ();
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44 endif
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45
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46 if (! isstruct (sys))
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47 error ("sysgettype: input sys is not a structure");
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48 endif
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49
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50 typestr = {"tf", "zp", "ss"};
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51 systype = typestr{sys.sys(1) + 1};
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52
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53 endfunction