function auxvar
%AUXVAR  Auxiliary variables for the parameter estimation schemes.
%	MAXITER: The maximum number of iterations to be performed when search-
%	ing for the minimum. Default is MAXITER=10. With MAXITER=0 only a non-
%	iterative initial value estimation procedure is carried out.
%
%	TOL: The iterations are continued until the candidate update vector
%	has a norm less than TOL. Default is TOL=0.01. This norm is measured
%	as the expected improvment of fit, expressed in percent.
%	The iterations are also terminated when MAXITER is reached, or when 
%	the search procedure fails to find a lower value of the criterion 
%	along the candidate direction (first Gauss-Newton, then gradient).
%
%	LIM: The criterion is robustified, so that a residual that is larger
%	than LIM*(estimated standard deviation) carries a linear, rather than
%	quadratic weight. Default is LIM=1.6. LIM=0 means that a non-
%	robustified (truly quadratic) criterion is used.
%
%	MAXSIZE: No matrix with more than MAXSIZE elements is formed by the
%	algorithms. The default value is set by the .m-file idmsize. (On a
%	PC the default value is MAXSIZE = 4096). If you run into
%	memory problems	try lower values of MAXSIZE. See also MEMORY.
%
%	T: The sampling interval. Default is T=1. T is essential to obtain
%	physical frequency scales, and when transforming to continuous time.
%
%	Omitting trailing arguments or entering them as [] gives default.
%	The output argument IT_INF contains information about the iterations
%	when stopped: 
%	IT_INF=[last iter #,last fit improvement,norm of search vector]
%	The norm is measured as explained under TOL above.

%	L. Ljung
%	Copyright (c) 1986-95 by the MathWorks, Inc.
%	$Revision: 1.4 $  $Date: 1995/05/16 09:01:05 $
