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1 ## Copyright (C) 1993, 1994, 1995 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File } { [@var{retval}, @var{U}] =} is_detectable (@var{a}, @var{c}@{, @var{tol}@}) |
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21 ## @deftypefnx {Function File } { [@var{retval}, @var{U}] =} is_detectable (@var{sys}@{, @var{tol}@}) |
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22 ## Test for detactability (observability of unstable modes) of (@var{a},@var{c}). |
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23 ## |
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24 ## Returns 1 if the system @var{a} or the pair (@var{a},@var{c})is |
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25 ## detectable, 0 if not. |
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26 ## |
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27 ## @strong{See} @code{is_stabilizable} for detailed description of arguments and |
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28 ## computational method. |
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29 ## |
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30 ## Default: tol = 10*norm(a,'fro')*eps |
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31 ## |
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32 ## @end deftypefn |
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33 |
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34 ## See also: size, rows, columns, length, is_matrix, is_scalar, is_vector. |
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35 |
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36 function [retval,U] = is_detectable (a,c,tol) |
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37 |
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38 ## Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993. |
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39 ## Updated by John Ingram (ingraje@eng.auburn.edu) July 1996. |
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40 |
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41 if( nargin < 1) |
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42 usage("[retval,U] = is_detectable(a , c {, tol})"); |
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43 elseif(is_struct(a)) |
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44 ## system form |
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45 if(nargin == 2) |
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46 tol = c; |
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47 elseif(nargin > 2) |
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48 usage("[retval,U] = is_detectable(sys {, tol})"); |
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49 endif |
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50 [a,b,c] = sys2ss(a); |
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51 elseif(nargin > 3) |
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52 usage("[retval,U] = is_detectable(a , c {, tol})"); |
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53 endif |
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54 if(exist("tol")) |
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55 [retval,U] = is_stabilizable (a', c', tol); |
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56 else |
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57 [retval,U] = is_stabilizable (a', c'); |
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58 endif |
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59 |
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60 |
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61 endfunction |
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62 |
