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comparison m-toolbox/classes/@rational/getlowerFreq.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 % GETLOWERFREQ gets the frequency of the lowest pole in the model.
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 %
4 % DESCRIPTION: GETLOWERFREQ gets the frequency of the lowest pole in the
5 % model.
6 %
7 % CALL: f = getlowerFreq(pf);
8 %
9 % <a href="matlab:utils.helper.displayMethodInfo('rational', 'getlowerFreq')">Parameters Description</a>
10 %
11 % VERSION: $Id: getlowerFreq.m,v 1.9 2011/04/08 08:56:33 hewitson Exp $
12 %
13 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
14
15 function varargout = getlowerFreq(varargin)
16
17 %%% Check if this is a call for parameters
18 if utils.helper.isinfocall(varargin{:})
19 varargout{1} = getInfo(varargin{3});
20 return
21 end
22
23 pf = varargin{1};
24 poles = roots(pf.den);
25 zeros = roots(pf.num);
26
27 f = inf;
28 for j=1:numel(poles)
29 [fp,q] = utils.math.ri2fq(poles(j));
30 if fp < f
31 f = fp;
32 end
33 end
34 for j=1:numel(zeros)
35 [fp,q] = utils.math.ri2fq(zeros(j));
36 if fp < f
37 f = fp;
38 end
39 end
40
41 % Set outputs
42 varargout{1} = f;
43 end
44
45 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
46 % Local Functions %
47 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
48
49 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
50 %
51 % FUNCTION: getInfo
52 %
53 % DESCRIPTION: Get Info Object
54 %
55 % HISTORY: 11-07-07 M Hewitson
56 % Creation.
57 %
58 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
59
60 function ii = getInfo(varargin)
61 if nargin == 1 && strcmpi(varargin{1}, 'None')
62 sets = {};
63 pl = [];
64 else
65 sets = {'Default'};
66 pl = getDefaultPlist;
67 end
68 % Build info object
69 ii = minfo(mfilename, 'rational', 'ltpda', utils.const.categories.internal, '$Id: getlowerFreq.m,v 1.9 2011/04/08 08:56:33 hewitson Exp $', sets, pl);
70 ii.setModifier(false);
71 end
72
73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
74 %
75 % FUNCTION: getDefaultPlist
76 %
77 % DESCRIPTION: Get Default Plist
78 %
79 % HISTORY: 11-07-07 M Hewitson
80 % Creation.
81 %
82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
83
84 function plout = getDefaultPlist()
85 persistent pl;
86 if exist('pl', 'var')==0 || isempty(pl)
87 pl = buildplist();
88 end
89 plout = pl;
90 end
91
92 function pl = buildplist()
93 pl = plist.EMPTY_PLIST;
94 end
95