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Monster Media 1994 #1
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MATH
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NONLIN31.ZIP
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WHATSNEW.DOC
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1994-01-29
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Nonlin Version 3
Nonlin version 3 is a major upgrade from the previous version (2.5)
and involved many months of intensive programming effort. Some of
the improvements in version 3 are summarized below:
1. A greatly enhanced language for describing the analysis that
Nonlin is to perform. The syntax is similar to the C
programming language and includes intermediate variables,
arrays, conditional statements (IF, ELSE), and looping (DO,
WHILE, FOR). The new language makes it possible to describe
much more complex models and allows you to express complicated
functions is a more natural style.
2. A #INCLUDE statement that allows you to include external files
in your command file.
3. Significantly improved plotting commands. You can now specify
your own labels for the X and Y axes and the scaling has been
improved. A new SPLOT command allows you to create multiple
scatter plots and you can display one or two sets of points on
the same plot for comparison purposes. You can also optionally
connect the points with line segments.
4. Computation of a correlation matrix. The new CORRELATE command
causes Nonlin to compute and print a correlation matrix of your
input variables. This is useful for diagnosing highly
correlated independent variables that could cause problems for
the model.
5. You may select degrees or radians as the angle units for the
built-in trig library functions.
Because the language syntax has changed you will need to edit any
Nonlin command procedures that you have been using with earlier
versions of Nonlin. The new manual fully explains the language
syntax and all of the supplied example files (*.NLR) use the new
syntax. The following is a summary of the changes that are needed:
1. Each statement must be terminated with a semicolon. Note: in
previous versions the semicolon indicated that a statement was
continued to the next line, now statements may flow across
lines and are terminated by a semicolon.
2. The comment introducer sequence has been changed from '!' to
'//'.
3. The TITLE string must be enclosed in quote marks.
4. File names in OUTPUT and POUTPUT statements must be enclosed in
quote marks.
5. The default measure for angles is degrees rather than radians.
You can use the ANGLETYPE statement to change the default back
to radians if you wish.
6. The DOMAIN statement has been changed to an option on the plot
commands.