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comparison 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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-1:000000000000 0:f0afece42f48
1 % ISSTABLE tells if ssm is numerically stable
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 %
4 % DESCRIPTION: ISSTABLE tells if ssm is numerically stable
5 %
6 % val = sys.isStable
7 %
8 % <a href="matlab:utils.helper.displayMethodInfo('ssm', 'isStable')">Parameters Description</a>
9 %
10 % VERSION: $Id: isStable.m,v 1.6 2011/04/08 08:56:23 hewitson Exp $
11 %
12 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
13
14 function varargout = isStable(varargin)
15 %%% Check if this is a call for parameters
16 if utils.helper.isinfocall(varargin{:})
17 varargout{1} = getInfo(varargin{3});
18 return
19 end
20 objs = utils.helper.collect_objects(varargin(:), 'ssm');
21
22 utils.helper.msg(utils.const.msg.MNAME, ['running ', mfilename]);
23
24 for i=1:numel(objs)
25 if ~objs(i).isnumerical % checking system is numeric
26 error(['error in double : system named ' objs(i).name ' is not numeric']);
27 end
28 A = ssm.blockMatFusion(objs(i).amats, objs(i).sssizes, objs(i).sssizes);
29 Ts = objs(i).timestep;
30 if Ts == 0
31 vp = eig(A);
32 f = find(real(vp)>5e-15);
33 f2 = find(real(vp)>0);
34 display((vp(f)));
35 else
36 try
37 vp = eig(A^1024);
38 catch ME
39 vp = eig(A);
40 end
41 f = find(abs(vp)>1+5e-12);
42 f2 = find(abs(vp)>1);
43 display((vp(f)));
44 end
45 ninst = numel(f);
46 ninst2 = numel(f2);
47 isst(i) = ninst==0;
48 if ninst>0;
49 display(['warning, system named "' objs(i).name '" is not stable'])
50 elseif ninst2>0;
51 display(['warning, system named "' objs(i).name '" might be numerically unstable'])
52 else
53 display(['System named "' objs(i).name '" is stable'])
54 end
55 end
56 varargout ={isst};
57 end
58
59 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
60 % Local Functions %
61 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
62
63
64 %--------------------------------------------------------------------------
65 % Get Info Object
66 %--------------------------------------------------------------------------
67 function ii = getInfo(varargin)
68
69 if nargin == 1 && strcmpi(varargin{1}, 'None')
70 sets = {};
71 pl = [];
72 else
73 sets = {'Default'};
74 pl = getDefaultPlist;
75 end
76 % Build info object
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);
78 end
79
80 %--------------------------------------------------------------------------
81 % Get Default Plist
82 %--------------------------------------------------------------------------
83 function pl = getDefaultPlist()
84 pl = plist();
85 end
86