Mercurial > hg > ltpda

annotate m-toolbox/classes/@pzmodel/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 or zero 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 or zero in the
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5 % model.
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6 %
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7 % CALL: f = getlowerFreq(pzm);
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8 %
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9 % <a href="matlab:utils.helper.displayMethodInfo('pzmodel', 'getlowerFreq')">Parameters Description</a>
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10 %
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11 % VERSION: $Id: getlowerFreq.m,v 1.17 2011/04/08 08:56:32 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 pzm = varargin{1};
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24
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25 % Some input checking
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26 if length(pzm) > 1
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27 error('### This method works only with one input.');
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28 end
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29
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30 poles = pzm.poles;
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31 zeros = pzm.zeros;
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32 np = numel(poles);
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33 nz = numel(zeros);
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34 f = realmax;
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35 for j=1:np
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36 pole = poles(j);
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37 fc = pole.f;
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38 if fc < f
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39 f = fc;
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40 end
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41 end
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42
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43 for j=1:nz
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44 zero = zeros(j);
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45 fc = zero.f;
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46 if fc < f
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47 f = fc;
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48 end
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49 end
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50
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51 if np==0 && nz==0
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52 f = realmin;
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53 end
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54
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55 % Set outputs
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56 varargout{1} = f;
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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 % FUNCTION: getInfo
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66 %
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67 % DESCRIPTION: Get Info Object
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68 %
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69 % HISTORY: 11-07-07 M Hewitson
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70 % Creation.
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71 %
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72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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73
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74 function ii = getInfo(varargin)
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75 if nargin == 1 && strcmpi(varargin{1}, 'None')
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76 sets = {};
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77 pl = [];
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78 else
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79 sets = {'Default'};
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80 pl = getDefaultPlist;
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81 end
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82 % Build info object
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83 ii = minfo(mfilename, 'pzmodel', 'ltpda', utils.const.categories.internal, '$Id: getlowerFreq.m,v 1.17 2011/04/08 08:56:32 hewitson Exp $', sets, pl);
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84 ii.setModifier(false);
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85 end
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86
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87 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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88 %
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89 % FUNCTION: getDefaultPlist
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90 %
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91 % DESCRIPTION: Get Default Plist
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92 %
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93 % HISTORY: 11-07-07 M Hewitson
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94 % Creation.
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95 %
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96 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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97
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98 function plout = getDefaultPlist()
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99 persistent pl;
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100 if exist('pl', 'var')==0 || isempty(pl)
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101 pl = buildplist();
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102 end
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103 plout = pl;
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104 end
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105
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106 function pl = buildplist()
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107 pl = plist.EMPTY_PLIST;
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108 end
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109