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  ######################################
  
  ###############################################################
  ## Version control history
  ###############################################################
  ## $Id$
  ## $Log$
  ## Revision 1.12  2002/06/11 11:25:25  gawthrop
  ## No longer delay the simulated data.
  ##
  ## Revision 1.11  2002/05/20 13:32:36  gawthrop
  ## Sanity check on y_0
  ##
  ## Revision 1.10  2002/05/13 16:01:09  gawthrop
  ## Addes Q weighting matrix
  ##
  ## Revision 1.9  2002/05/08 10:14:21  gawthrop
  ## Idetification now OK (Moved data range in ppp_optimise by one sample interval)
  ##
  ## Revision 1.8  2002/04/23 17:50:39  gawthrop
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    printf("\n");
  endif
  
  while (abs(reduction)>extras.criterion)&&\
	(abs(err)>extras.criterion)&&\
	(iterations<extras.max_iterations)

    iterations = iterations + 1; # Increment iteration counter
    iterations = iterations + 1 # Increment iteration counter

    [y,y_par,x] = eval(sim_command); # Simulate
    [N_data,N_y] = size(y);
    [N_data,N_y] = size(y)

    if (N_y!=n_y)
      mess = sprintf("n_y (%i) in data not same as n_y (%i) in model", n_y,N_y);
      error(mess);
    endif

    ## Use the last part of the simulation to compare with data
    ## ### Removed #### And shift back by one data point
    if ( (N_data-n_data)<1 )
      error(sprintf("y_0 (%i) must be shorter than y (%i)", n_data, N_data));
    endif
#     if ( (N_data-n_data)<1 )
#       error(sprintf("y_0 (%i) must be shorter than y (%i)", n_data, N_data));
#     endif
    
    ## Use the last part of the simulation to compare with data
    ## And shift back by one data point
    y = y(N_data-n_data:N_data-1,:);
    y_par = y_par(N_data-n_data:N_data-1,:);
    y = y(N_data-n_data+1:N_data,:);
    y_par = y_par(N_data-n_data+1:N_data,:);

    if extras.visual==1
      ## Plot
      title("Optimisation data");
      plot([y y_0])
    endif
    
    ##Evaluate error, cost derivative J and cost second derivative JJ
    err = 0; 
    J = zeros(n_th,1);
    JJ = zeros(n_th,n_th);
   
    for i = 1:n_y
      E = y(:,i) - y_0(:,i);	#  Error in ith output

MTT: Model Transformation Tools
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