--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@pzmodel/tomiir.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,138 @@
+% TOMIIR converts a pzmodel to an IIR filter using a bilinear transform.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% DESCRIPTION: TOMIIR converts a pzmodel to an IIR filter using a bilinear
+%              transform.
+%
+% CALL:        f = tomiir(pzm, fs); % construct for this sample frequency fs
+%              f = tomiir(pzm, pl); % construct from plist
+%
+% <a href="matlab:utils.helper.displayMethodInfo('pzmodel', 'tomiir')">Parameters Description</a>
+%
+% VERSION:     $Id: tomiir.m,v 1.18 2011/04/08 08:56:32 hewitson Exp $
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function varargout = tomiir(varargin)
+  
+  %%% Check if this is a call for parameters
+  if utils.helper.isinfocall(varargin{:})
+    varargout{1} = getInfo(varargin{3});
+    return
+  end
+  
+  % Check output arguments number
+  if nargout == 0
+    error('### pzmodel/tomiir cannot be used as a modifier. Please give an output variable.');
+  end
+  
+  % Collect input variable names
+  in_names = cell(size(varargin));
+  for ii = 1:nargin,in_names{ii} = inputname(ii);end
+  
+  % Collect all AOs
+  [pzms, pzm_invars] = utils.helper.collect_objects(varargin(:), 'pzmodel', in_names);
+  pls  = utils.helper.collect_objects(varargin(:), 'plist');
+  
+  % Store inhists to suppress intermediate history steps
+  inhists = [pzms(:).hist];
+  
+  % Get default parameters
+  pl = parse(pls, getDefaultPlist);
+  
+  % Decide on a deep copy or a modify
+  pzms = copy(pzms, nargout);
+  
+  % Get fs
+  fs = pl.find('fs');
+  if nargin == 2
+    if isnumeric(varargin{2})
+      fs = varargin{2};
+    end
+  end
+  
+  si = size(pzms);
+  f(si(1), si(2)) = miir();
+  for kk = 1:numel(pzms)
+    
+    % get a and b coefficients
+    [a,b] = pzm2ab(pzms(kk), fs);
+    
+    % throws a warning if the model has a delay
+    if(pzms(kk).delay~=0)
+      disp('!!!  PZmodel delay is not used in the discretization')
+    end
+    % make MIIR filter
+    f(kk) = miir(a,b,fs);
+    f(kk).addHistory(getInfo, pl, pzm_invars(kk), inhists(kk));
+  end
+  
+  % Set output
+  if nargout == numel(f)
+    % List of outputs
+    for ii = 1:numel(f)
+      varargout{ii} = f(ii);
+    end
+  else
+    % Single output
+    varargout{1} = f;
+  end
+  
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                               Local Functions                               %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% FUNCTION:    getInfo
+%
+% DESCRIPTION: Get Info Object
+%
+% HISTORY:     11-07-07 M Hewitson
+%                Creation.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+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, 'pzmodel', 'ltpda', utils.const.categories.op, '$Id: tomiir.m,v 1.18 2011/04/08 08:56:32 hewitson Exp $', sets, pl);
+  ii.setModifier(false);
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% FUNCTION:    getDefaultPlist
+%
+% DESCRIPTION: Get Default Plist
+%
+% HISTORY:     11-07-07 M Hewitson
+%                Creation.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function plout = getDefaultPlist()
+  persistent pl;  
+  if exist('pl', 'var')==0 || isempty(pl)
+    pl = buildplist();
+  end
+  plout = pl;  
+end
+
+function plo = buildplist()
+  plo = plist();
+  
+  % FS
+  p = param({'fs', 'Frequency of the iir filter.'}, paramValue.DOUBLE_VALUE(1));
+  plo.append(p);
+  
+end
+