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annotate m-toolbox/classes/@ssm/isStable.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % ISSTABLE tells if ssm is numerically stable
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: ISSTABLE tells if ssm is numerically stable
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5 %
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6 % val = sys.isStable
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7 %
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8 % <a href="matlab:utils.helper.displayMethodInfo('ssm', 'isStable')">Parameters Description</a>
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9 %
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10 % VERSION: $Id: isStable.m,v 1.6 2011/04/08 08:56:23 hewitson Exp $
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11 %
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12 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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13
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14 function varargout = isStable(varargin)
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15 %%% Check if this is a call for parameters
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16 if utils.helper.isinfocall(varargin{:})
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17 varargout{1} = getInfo(varargin{3});
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18 return
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19 end
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20 objs = utils.helper.collect_objects(varargin(:), 'ssm');
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21
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22 utils.helper.msg(utils.const.msg.MNAME, ['running ', mfilename]);
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23
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24 for i=1:numel(objs)
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25 if ~objs(i).isnumerical % checking system is numeric
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26 error(['error in double : system named ' objs(i).name ' is not numeric']);
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27 end
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28 A = ssm.blockMatFusion(objs(i).amats, objs(i).sssizes, objs(i).sssizes);
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29 Ts = objs(i).timestep;
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30 if Ts == 0
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31 vp = eig(A);
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32 f = find(real(vp)>5e-15);
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33 f2 = find(real(vp)>0);
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34 display((vp(f)));
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35 else
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36 try
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37 vp = eig(A^1024);
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38 catch ME
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39 vp = eig(A);
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40 end
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41 f = find(abs(vp)>1+5e-12);
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42 f2 = find(abs(vp)>1);
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43 display((vp(f)));
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44 end
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45 ninst = numel(f);
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46 ninst2 = numel(f2);
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47 isst(i) = ninst==0;
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48 if ninst>0;
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49 display(['warning, system named "' objs(i).name '" is not stable'])
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50 elseif ninst2>0;
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51 display(['warning, system named "' objs(i).name '" might be numerically unstable'])
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52 else
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53 display(['System named "' objs(i).name '" is stable'])
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54 end
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55 end
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56 varargout ={isst};
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57 end
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58
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59 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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60 % Local Functions %
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61 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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62
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63
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64 %--------------------------------------------------------------------------
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65 % Get Info Object
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66 %--------------------------------------------------------------------------
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67 function ii = getInfo(varargin)
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68
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69 if nargin == 1 && strcmpi(varargin{1}, 'None')
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70 sets = {};
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71 pl = [];
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72 else
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73 sets = {'Default'};
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74 pl = getDefaultPlist;
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75 end
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76 % Build info object
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77 ii = minfo(mfilename, 'ssm', 'ltpda', utils.const.categories.output, '$Id: isStable.m,v 1.6 2011/04/08 08:56:23 hewitson Exp $', sets, pl);
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78 end
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79
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80 %--------------------------------------------------------------------------
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81 % Get Default Plist
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82 %--------------------------------------------------------------------------
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83 function pl = getDefaultPlist()
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84 pl = plist();
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85 end
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86