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<H1><A NAME="SECTION00510000000000000000"> </A><A NAME="def_ds_parser"> </A><A NAME="1686"> </A><A NAME="1687"> </A>
<BR>
Defining Dynamical Systems Using the Parser Window
</H1>
<P>
The parser allows the user to define a vector field or mapping in a simple
textual format as opposed to C code language.
This may be extended to a full description of the
dynamical system by defining initial conditions
and default ranges for the variables and parameters,
declaring variables periodic on a specified interval,
and defining auxiliary functions.
Once a dynamical system has been defined in a text window,
it may be interpreted and examined within DsTool.
<P>
The capabilities of the parser will be described by considering
a number of examples. These examples are included as text
files in the directory $DSTOOL/data/parser/, and may be loaded into
the parser editor window.
<P>
While the parser is intended to be an easy-to-use general
purpose tool, for extensive and/or more sophisticated calculations with a
vector field or mapping, a full C-code model file should
be compiled into DsTool. See section <A HREF="node52.html#def_ds"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]"
SRC="/usr/lib/latex2html/icons.gif/cross_ref_motif.gif"></A> for more
information on this process. This is primarily because:
<DL COMPACT>
<DT>1.
<DD>Computations with the parsed dynamical system will incur additional
overhead since the code for evaluation of the dynamical system is not compiled.
<DT>2.
<DD>Certain features cannot be defined by the parser. In addition,
they will not be included into the automatically generated C code, and
have to be added by hand. See section <A HREF="node42.html#parser_limitations"><IMG ALIGN="BOTTOM" BORDER="1" ALT="[*]"
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limitations for more details.
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<LI><A NAME="tex2html969"
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<LI><A NAME="tex2html970"
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<ADDRESS>
<I>John Lapeyre</I>
<BR><I>1998-09-04</I>
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