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annotate m-toolbox/classes/@pz/resp.m @ 31:a26669b59d7e database-connection-manager

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Update LTPDAworkbench
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % RESP returns the complex response of the pz object.
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: RESP returns the complex response of the pz object. The
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5 % response is computed assuming that object represents a pole.
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6 % If the object represents a zero, just take the inverse of
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 % the returned response: 1./r.
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8 %
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9 % CALL: [f,r] = resp(p, f); % compute response for vector f
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10 % [f,r] = resp(p, f1, f2, nf); % compute response from f1 to f2
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11 % % in nf steps.
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12 % [f,r] = resp(p, f1, f2, nf, scale); % compute response from f1 to f2
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13 % % in nf steps using scale ['lin' or 'log'].
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14 % [f,r] = resp(p); % compute response
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15 %
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16 % REMARK: This is just a helper function. This function should only be
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17 % called from class functions.
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18 %
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19 % VERSION: $Id: resp.m,v 1.9 2011/02/18 16:48:54 ingo Exp $
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20 %
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21 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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22
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23 function [f,r] = resp(varargin)
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24
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Daniele Nicolodi <nicolodi@science.unitn.it>
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25 %%% Input objects checks
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26 if nargin < 1
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27 error('### incorrect number of inputs.')
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28 end
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29
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30 %%% look at inputs
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31 p = varargin{1};
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32 if ~isa(p, 'pz')
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33 error('### first argument should be a pz object.');
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34 end
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35
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36 %%% decide whether we modify the pz-object, or create a new one.
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37 p = copy(p, nargout);
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38
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Daniele Nicolodi <nicolodi@science.unitn.it>
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39 %%% Now look at the pole
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Daniele Nicolodi <nicolodi@science.unitn.it>
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40 f0 = p.f;
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41 Q = p.q;
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42
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43 %%% Define frequency vector
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44 f = [];
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45
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46 if nargin == 1
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47 f1 = f0/10;
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48 f2 = f0*10;
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49 nf = 1000;
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50 scale = 'lin';
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51 elseif nargin == 2
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52 f = varargin{2};
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53 elseif nargin == 4
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54 f1 = varargin{2};
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55 f2 = varargin{3};
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56 nf = varargin{4};
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57 scale = 'lin';
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58 elseif nargin == 5
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59 f1 = varargin{2};
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60 f2 = varargin{3};
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61 nf = varargin{4};
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62 scale = varargin{5};
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63 else
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64 error('### incorrect number of inputs.');
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65 end
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66
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67 %%% Build f if we need it
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68 if isempty(f)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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69 switch lower(scale)
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70 case 'lin'
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71 f = linspace(f1, f2, nf);
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72 case 'log'
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73 f = logspace(log10(f1), log10(f2), nf);
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74 end
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75 end
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76
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77
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78 %%% Now compute the response
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79 if Q>=0.5
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80 re = 1 - (f.^2./f0^2);
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81 im = f ./ (f0*Q);
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82 r = 1./complex(re, im);
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83 else
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84 re = 1;
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85 im = f./f0;
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86 r = 1./complex(re, im);
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87 end
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88 end
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