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−% GETLOWERFREQ gets the frequency of the lowest pole in the model.
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%
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−% DESCRIPTION: GETLOWERFREQ gets the frequency of the lowest pole in the
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−%              model.
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−%
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−% CALL:        f = getlowerFreq(pf);
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−%
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−% <a href="matlab:utils.helper.displayMethodInfo('rational', 'getlowerFreq')">Parameters Description</a>
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−%
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−% VERSION:     $Id: getlowerFreq.m,v 1.9 2011/04/08 08:56:33 hewitson Exp $
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−%
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
+
−function varargout = getlowerFreq(varargin)
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−
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−  %%% Check if this is a call for parameters
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−  if utils.helper.isinfocall(varargin{:})
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−    varargout{1} = getInfo(varargin{3});
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−    return
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−  end
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−
+
−  pf   = varargin{1};
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−  poles = roots(pf.den);
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−  zeros = roots(pf.num);
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−  
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−  f = inf;
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−  for j=1:numel(poles)
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−    [fp,q] =  utils.math.ri2fq(poles(j));
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−    if fp < f
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−      f = fp;
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−    end
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−  end
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−  for j=1:numel(zeros)
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−    [fp,q] =  utils.math.ri2fq(zeros(j));
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−    if fp < f
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−      f = fp;
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−    end
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−  end
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−
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−  % Set outputs
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−  varargout{1} = f;
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−end
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−
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%                               Local Functions                               %
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%
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−% FUNCTION:    getInfo
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−%
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−% DESCRIPTION: Get Info Object
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−%
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−% HISTORY:     11-07-07 M Hewitson
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−%                Creation.
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−%
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
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−function ii = getInfo(varargin)
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−  if nargin == 1 && strcmpi(varargin{1}, 'None')
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−    sets = {};
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−    pl   = [];
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−  else
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−    sets = {'Default'};
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−    pl   = getDefaultPlist;
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−  end
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−  % Build info object
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−  ii = minfo(mfilename, 'rational', 'ltpda', utils.const.categories.internal, '$Id: getlowerFreq.m,v 1.9 2011/04/08 08:56:33 hewitson Exp $', sets, pl);
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−  ii.setModifier(false);
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−end
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−
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−%
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−% FUNCTION:    getDefaultPlist
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−%
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−% DESCRIPTION: Get Default Plist
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−%
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−% HISTORY:     11-07-07 M Hewitson
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−%                Creation.
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−%
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−%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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−
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−function plout = getDefaultPlist()
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−  persistent pl;  
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−  if exist('pl', 'var')==0 || isempty(pl)
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−    pl = buildplist();
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−  end
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−  plout = pl;  
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−end
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−
+
−function pl = buildplist()
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−  pl = plist.EMPTY_PLIST;
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−end
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−