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Release Notes System Identification Toolbox 4.0.3
System Identification version 4.0.3 is a MATLAB 5 compliant version. The
functionality is similar to the System ID Toolbox version 4.0
running under MATLAB 4.2c.
Compared to version 3 it has the following enhancements:
The main addition from version 3.0a is that a graphical user
interface, ident, is available. Most of the toolbox's functions
can be accessed through this interface. To start it, type
ident
at the MATLAB command line. There is an interactive demo available
(under the Help menu) that illustrates the use of the interface.
Version 4.0 also includes some new functions:
n4sid: A subspace method to estimate state-space models
idinput: Generates input signals for identification.
idresamp: Resamples data by decimation and interpolation.
idmodred: Model reduction for models given in the theta-format
ss2th: Transformation from an arbitrary state-space model
to a parmetrized model in observer canonical form
Some functions have added features:
idsim: Now allows for the computation of confidence intervals
around the simulated output.
armax, bj, oe, and pem: These iterative estimation procedures
no longer automatically give information to the
MATLAB command window. To obtain that, a last argument
with the value 'trace' must be supplied.
To get more information about the routines use HELP.
Complement to the manual: The input argument TOL (described under
AUXVAR in the manual) has a new interpretation. It
corresponds to the expected relative improvement of
the criterion of fit, measured in percent. See HELP AUXVAR.
List of known bugs or bad behavior.
1) When new lines are added to plots, the plot figure will pop to the
front. This is necessary in MATLAB 4.x which requires that lines
and axes be created in the CurrentFigure only.
2) It is good practice to press the Return key after having filled out
any white edit field in the graphical interface. This will execute
the callback to the edit control. Otherwise you may have to click
twice on any action pushbutton to make it react. This is because
the first click will execute the callback to the edit control.
This "feature" is expected by people with click-to-focus pointer
policy, but is considered "bad behavior" by people who use
a point-to-focus pointer policy.
3) If a command window error occurs when executing a callback, the
cursor may stay in its 'watch' mode. Then just click anywhere in
the main ident window to restore it to 'arrow'.
% Lennart Ljung % Copyright (c) 1986-98 by The MathWorks, Inc. % $Revision: 2.4 $ $Date: 1997/12/02 03:44:17 $