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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 the |
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7 ## Free Software Foundation; either version 2, or (at your option) any |
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8 ## later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301 USA. |
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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 (! isstruct (sys)) |
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43 error ("sysgettype: input sys is not a structure"); |
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44 endif |
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45 |
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46 typestr = {"tf", "zp", "ss"}; |
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47 systype = typestr{ sys.sys(1) + 1}; |
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48 |
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49 endfunction |
