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