function timeresp(this, RespType, r, varargin)
% TIMERESP Updates time response data
%
%  RESPTYPE = {step, impulse, initial}
%  VARARGIN = {Tfinal or time vector, X0 (initial state), U (input data)}.

%  Author(s): Bora Eryilmaz
%  Copyright 1986-2004 The MathWorks, Inc.
%  $Revision: 1.1.6.3 $ $Date: 2004/12/10 19:33:24 $
s = size(this.Model);
if prod(s(3:end))~=length(r.Data)
   return  % number of models does not match number of data objects
end

% Get new data from the @ltisource object.
NormalRefresh = strcmp(r.RefreshMode, 'normal');
Ts = getst(this.Model);
for ct = 1:length(r.Data)
   % Look for visible+cleared responses in response array
   if isempty(r.Data(ct).Amplitude) && strcmp(r.View(ct).Visible,'on')
      sys = this.Model(:,:,ct);
      if isfinite(sys) && iscomputable(sys,RespType,NormalRefresh,varargin{:})
         % Skip if model is NaN or response cannot be computed
         d = r.Data(ct);  
         if NormalRefresh
            % Regenerate data on appropriate grid based on input arguments
            try
                [d.Amplitude,d.Time,d.Focus] = gentresp(sys, RespType, varargin{:});
            catch
                [d.Amplitude,d.Time,d.Focus] = gentresp(sys, RespType, [], varargin{2:end});
            end
         else
             % Reuse the current time vector for maximum speed
             try              
                 d.Amplitude = gentresp(sys, RespType, d.Time, varargin{2:end});
             catch
                 [d.Amplitude,d.Time] = gentresp(sys, RespType, [], varargin{2:end})
             end
         end
         d.Ts = Ts;
      end
   end
end