line source
+ − % SSM2RATIONAL converts a statespace model object to a rational frac. object
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ − %
+ − % DESCRIPTION: SSM2RATIONAL converts a statespace model object to
+ − % a rational fraction object.
+ − %
+ − % CALL:
+ − % >> rats = ssm2rational(ssm, pl);
+ − %
+ − % INPUT :
+ − %
+ − % ssm - a ssm object
+ − % pl - a plist with parameters 'inputs', 'states' and
+ − % 'outputs' to indicate which inputs, states and output
+ − % variables are taken in account. This requires proper
+ − % variable naming. If a variable called appears more
+ − % that once it will be used once only.
+ − %
+ − %
+ − % OUTPUT:
+ − %
+ − % rats - an array of rational fraction object
+ − %
+ − % <a href="matlab:utils.helper.displayMethodInfo('ssm', 'ssm2rational')">Parameters Description</a>
+ − %
+ − % VERSION: $Id: ssm2rational.m,v 1.19 2011/04/08 08:56:23 hewitson Exp $
+ − %
+ − % IMPLEMENTATION NOT FINISHED!!!!
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ −
+ − function varargout = ssm2rational(varargin)
+ −
+ − % Check if this is a call for parameters
+ − if utils.helper.isinfocall(varargin{:})
+ − varargout{1} = getInfo(varargin{3});
+ − return
+ − end
+ −
+ − %% starting initial checks
+ − utils.helper.msg(utils.const.msg.MNAME, ['running ', mfilename]);
+ −
+ − % Collect input variable names
+ − in_names = cell(size(varargin));
+ − for ii = 1:nargin,in_names{ii} = inputname(ii);end
+ −
+ − % Collect all SSMs and plists
+ − [sys, ssm_invars, rest] = utils.helper.collect_objects(varargin(:), 'ssm', in_names);
+ − [pl, invars2, rest] = utils.helper.collect_objects(rest(:), 'plist');
+ − if ~isempty(rest)
+ − pl = combine(pl, plist(rest{:}));
+ − end
+ − pl = combine(pl, getDefaultPlist());
+ −
+ − if numel(sys) ~= 1
+ − error('### Input (only) one SSM object.');
+ − end
+ −
+ − %% begin function body
+ −
+ − %% convert to double
+ − % Convert to double arrays
+ − [A,B,C,D,Ts,inputvarnames,ssvarnames,outputvarnames] = double(sys, pl);
+ −
+ − Ninputs_out = numel(inputvarnames);
+ − Noutputs_out = numel(outputvarnames);
+ −
+ − if Ts > 0
+ − error('system should be time continuous. Use ssm2miir instead');
+ − else
+ − %% convert to pzm
+ − rational_out(Noutputs_out, Ninputs_out) = rational();
+ − for ii=1:Ninputs_out
+ − for oo=1:Noutputs_out
+ − sys_loc =ss( A,B(:,ii),C(oo,:),D(oo, ii ),Ts);
+ − sys_loc = minreal(sys_loc);
+ − [A_loc, B_loc, C_loc, D_loc]=ssdata(sys_loc);
+ − [b,a] = ss2tf(A_loc, B_loc, C_loc, D_loc);
+ − name = [ssm_invars{1},' : ',inputvarnames{ii},' -> ',outputvarnames{oo}];
+ − if isequal(b,0) || isequal(a,0)
+ − m = rational();
+ − else
+ − m = rational(real(b), real(a), 1/sys.timestep);
+ − end
+ − m.addHistory(ssm.getInfo(mfilename), pl , ssm_invars, sys.hist);
+ − m.name = name;
+ − rational_out(oo, ii) = m;
+ − end
+ − end
+ − end
+ − if nargout == numel(rational_out)
+ − for ii = 1:numel(rational_out)
+ − varargout{ii} = rational_out(ii);
+ − end
+ − else
+ − varargout{1} = rational_out;
+ − end
+ − end
+ −
+ − %--------------------------------------------------------------------------
+ − % Get Info Object
+ − %--------------------------------------------------------------------------
+ − function ii = getInfo(varargin)
+ −
+ − if nargin == 1 && strcmpi(varargin{1}, 'None')
+ − sets = {};
+ − pl = [];
+ − else
+ − sets = {'Default'};
+ − pl = getDefaultPlist;
+ − end
+ − % Build info object
+ − 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);
+ − end
+ −
+ − %--------------------------------------------------------------------------
+ − % Get Default Plist
+ − %--------------------------------------------------------------------------
+ − function pl = getDefaultPlist()
+ − pl = plist();
+ −
+ − p = param({'inputs', ['Specify the inputs. Give one of:<ul>'...
+ − '<li>A cell-array of input port names.</li>'...
+ − '<li>A cell-array of logical arrays specifying which input ports to use for each input block.</li>'...
+ − '<li>A cell-array of double values specifying which input ports to use for each input block.<li>'...
+ − '<li>The string ''ALL'' to use all inputs.']}, paramValue.STRING_VALUE('ALL'));
+ − pl.append(p);
+ −
+ − p = param({'states', 'Specify the states. Specify the states as for the ''inputs'' parameter.'}, paramValue.STRING_VALUE('ALL'));
+ − pl.append(p);
+ −
+ − p = param({'outputs', 'Specify the outputs. Specify the outputs as for the ''inputs'' parameter.'}, paramValue.STRING_VALUE('ALL'));
+ − pl.append(p);
+ − end
+ −