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annotate m-toolbox/classes/@rational/fromPzmodel.m @ 8:2f5c9bd7d95d database-connection-manager

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Clarify ltpda_uo.retrieve parameters handling
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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2 %
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3 % FUNCTION: fromPzmodel
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4 %
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5 % DESCRIPTION: Construct a rational from a pzmodel
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6 %
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7 % CALL: r = fromPzmodel(a, pl)
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8 %
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9 % PARAMETER: pl - plist
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10 %
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11 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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12 function r = fromPzmodel(r, pli)
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13
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14 VERSION = '$Id: fromPzmodel.m,v 1.11 2011/08/15 12:41:45 hewitson Exp $';
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15
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16
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17 % get pzmodel info
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18 ii = rational.getInfo('rational', 'From Pzmodel');
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19
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20 % Set the method version string in the minfo object
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21 ii.setMversion([VERSION '-->' ii.mversion]);
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22
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23 % Combine input plist with default values
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24 pl = applyDefaults(ii.plists, pli);
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25
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26 % Set fields
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27 pzm = find(pl, 'pzmodel');
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28
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29 %--- Convert to rational
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30
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31 % get normalising gains
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32 pg = 1;
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33 for jj=1:numel(pzm.poles)
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34 if pzm.poles(jj).q > 0.5
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35 pg = pg .* 4*pi*pi*pzm.poles(jj).f*pzm.poles(jj).f;
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36 else
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37 pg = pg .* 2*pi*pzm.poles(jj).f;
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38 end
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39 end
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40 zg = 1;
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41 for jj=1:numel(pzm.zeros)
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42 if pzm.zeros(jj).q > 0.5
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43 zg = zg .* 4*pi*pi*pzm.zeros(jj).f*pzm.zeros(jj).f;
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44 else
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45 zg = zg .* 2*pi*pzm.zeros(jj).f;
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46 end
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47 end
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48 % construct rational terms
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49 if isempty(pzm.poles) % in case on no poles
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50 den = 1;
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51 else
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52 den = poly(vertcat(pzm.poles(:).ri))./pg;
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53 end
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54 if isempty(pzm.zeros) % in case on no zeros
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55 num = pzm.gain;
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56 else
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57 num = pzm.gain.*poly(vertcat(pzm.zeros(:).ri))./zg;
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58 end
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59
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60 r.num = num;
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61 r.den = den;
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62
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63 % Override some properties from the input pzmodel
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64 if isempty(pl.find('ounits'))
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65 pl.pset('ounits', pzm.ounits);
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66 end
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67
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68 if isempty(pl.find('iunits'))
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69 pl.pset('iunits', pzm.iunits);
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70 end
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71
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72 if isempty(pl.find('name'))
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73 pl.pset('name', sprintf('rational(%s)', pzm.name));
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74 end
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75
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76 if isempty(pl.find('description'))
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77 pl.pset('description', pzm.description);
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78 end
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79
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80 % Add history
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81 r.addHistory(ii, pl, [], pzm.hist);
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82
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83 % Set object properties
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84 r.setObjectProperties(pl);
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85
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86 end