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