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annotate m-toolbox/classes/@ssm/ssm2rational.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 % SSM2RATIONAL converts a statespace model object to a rational frac. object
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % DESCRIPTION: SSM2RATIONAL converts a statespace model object to
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5 % a rational fraction object.
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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7 % CALL:
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Daniele Nicolodi <nicolodi@science.unitn.it>
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8 % >> rats = ssm2rational(ssm, pl);
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9 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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10 % INPUT :
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11 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 % ssm - a ssm object
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13 % pl - a plist with parameters 'inputs', 'states' and
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14 % 'outputs' to indicate which inputs, states and output
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15 % variables are taken in account. This requires proper
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16 % variable naming. If a variable called appears more
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17 % that once it will be used once only.
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18 %
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19 %
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20 % OUTPUT:
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21 %
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22 % rats - an array of rational fraction object
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23 %
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24 % <a href="matlab:utils.helper.displayMethodInfo('ssm', 'ssm2rational')">Parameters Description</a>
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25 %
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26 % VERSION: $Id: ssm2rational.m,v 1.19 2011/04/08 08:56:23 hewitson Exp $
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27 %
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28 % IMPLEMENTATION NOT FINISHED!!!!
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29 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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30
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31 function varargout = ssm2rational(varargin)
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32
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33 % Check if this is a call for parameters
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Daniele Nicolodi <nicolodi@science.unitn.it>
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34 if utils.helper.isinfocall(varargin{:})
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Daniele Nicolodi <nicolodi@science.unitn.it>
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35 varargout{1} = getInfo(varargin{3});
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Daniele Nicolodi <nicolodi@science.unitn.it>
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36 return
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37 end
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38
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Daniele Nicolodi <nicolodi@science.unitn.it>
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39 %% starting initial checks
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40 utils.helper.msg(utils.const.msg.MNAME, ['running ', mfilename]);
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41
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42 % Collect input variable names
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Daniele Nicolodi <nicolodi@science.unitn.it>
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43 in_names = cell(size(varargin));
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Daniele Nicolodi <nicolodi@science.unitn.it>
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44 for ii = 1:nargin,in_names{ii} = inputname(ii);end
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45
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Daniele Nicolodi <nicolodi@science.unitn.it>
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46 % Collect all SSMs and plists
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Daniele Nicolodi <nicolodi@science.unitn.it>
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47 [sys, ssm_invars, rest] = utils.helper.collect_objects(varargin(:), 'ssm', in_names);
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48 [pl, invars2, rest] = utils.helper.collect_objects(rest(:), 'plist');
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49 if ~isempty(rest)
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50 pl = combine(pl, plist(rest{:}));
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51 end
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52 pl = combine(pl, getDefaultPlist());
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53
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54 if numel(sys) ~= 1
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55 error('### Input (only) one SSM object.');
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56 end
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57
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58 %% begin function body
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59
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Daniele Nicolodi <nicolodi@science.unitn.it>
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60 %% convert to double
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61 % Convert to double arrays
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Daniele Nicolodi <nicolodi@science.unitn.it>
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62 [A,B,C,D,Ts,inputvarnames,ssvarnames,outputvarnames] = double(sys, pl);
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63
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64 Ninputs_out = numel(inputvarnames);
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65 Noutputs_out = numel(outputvarnames);
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66
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Daniele Nicolodi <nicolodi@science.unitn.it>
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67 if Ts > 0
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68 error('system should be time continuous. Use ssm2miir instead');
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Daniele Nicolodi <nicolodi@science.unitn.it>
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69 else
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Daniele Nicolodi <nicolodi@science.unitn.it>
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70 %% convert to pzm
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Daniele Nicolodi <nicolodi@science.unitn.it>
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71 rational_out(Noutputs_out, Ninputs_out) = rational();
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Daniele Nicolodi <nicolodi@science.unitn.it>
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72 for ii=1:Ninputs_out
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Daniele Nicolodi <nicolodi@science.unitn.it>
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73 for oo=1:Noutputs_out
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Daniele Nicolodi <nicolodi@science.unitn.it>
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74 sys_loc =ss( A,B(:,ii),C(oo,:),D(oo, ii ),Ts);
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75 sys_loc = minreal(sys_loc);
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76 [A_loc, B_loc, C_loc, D_loc]=ssdata(sys_loc);
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77 [b,a] = ss2tf(A_loc, B_loc, C_loc, D_loc);
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78 name = [ssm_invars{1},' : ',inputvarnames{ii},' -> ',outputvarnames{oo}];
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79 if isequal(b,0) || isequal(a,0)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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80 m = rational();
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81 else
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82 m = rational(real(b), real(a), 1/sys.timestep);
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83 end
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84 m.addHistory(ssm.getInfo(mfilename), pl , ssm_invars, sys.hist);
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85 m.name = name;
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86 rational_out(oo, ii) = m;
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87 end
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88 end
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89 end
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90 if nargout == numel(rational_out)
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91 for ii = 1:numel(rational_out)
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92 varargout{ii} = rational_out(ii);
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93 end
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94 else
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95 varargout{1} = rational_out;
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96 end
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97 end
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98
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99 %--------------------------------------------------------------------------
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100 % Get Info Object
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101 %--------------------------------------------------------------------------
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102 function ii = getInfo(varargin)
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103
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Daniele Nicolodi <nicolodi@science.unitn.it>
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104 if nargin == 1 && strcmpi(varargin{1}, 'None')
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Daniele Nicolodi <nicolodi@science.unitn.it>
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105 sets = {};
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106 pl = [];
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107 else
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108 sets = {'Default'};
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109 pl = getDefaultPlist;
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110 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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111 % Build info object
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112 ii = minfo(mfilename, 'ssm', 'ltpda', utils.const.categories.converter, '$Id: ssm2rational.m,v 1.19 2011/04/08 08:56:23 hewitson Exp $', sets, pl);
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113 end
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114
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115 %--------------------------------------------------------------------------
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116 % Get Default Plist
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117 %--------------------------------------------------------------------------
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118 function pl = getDefaultPlist()
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119 pl = plist();
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120
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121 p = param({'inputs', ['Specify the inputs. Give one of:<ul>'...
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122 '<li>A cell-array of input port names.</li>'...
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123 '<li>A cell-array of logical arrays specifying which input ports to use for each input block.</li>'...
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124 '<li>A cell-array of double values specifying which input ports to use for each input block.<li>'...
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125 '<li>The string ''ALL'' to use all inputs.']}, paramValue.STRING_VALUE('ALL'));
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126 pl.append(p);
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127
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128 p = param({'states', 'Specify the states. Specify the states as for the ''inputs'' parameter.'}, paramValue.STRING_VALUE('ALL'));
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129 pl.append(p);
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130
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131 p = param({'outputs', 'Specify the outputs. Specify the outputs as for the ''inputs'' parameter.'}, paramValue.STRING_VALUE('ALL'));
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132 pl.append(p);
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133 end
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Daniele Nicolodi <nicolodi@science.unitn.it>
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134