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>The Gambit Command Language</TITLE
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>Gambit: Software Tools for Game Theory</TH
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><DIV
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><H1
><A
NAME="AEN524"
>The Gambit Command Language</A
></H1
><P
>This chapter is an introduction to the Gambit Command Language (GCL).
The GCL provides a
method of directing the operation of Gambit that is analagous to that
of a high level general purpose programming language.</P
><P
>The purpose of the GCL is to provide a simple, but powerful and
flexible language by which one can perform complicated or repetitive
operations and procedures on games in extensive or normal form. The
language has facilities for building and editing an extensive or
normal form game, converting back and forth between the extensive and
normal form representations, and solving the resulting games for
various equilibria of interest. Standard arithmetic, logic, text and
input-output operations are provided, as well as vectorizable
functions which support many vector and matrix operations. Flow
control statements allow for repetitive operations (such as
investigating games as one changes various parameters) or conditional
operations. Thus the GCL is also suitable for certain types of
econometric analysis of games.</P
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN528"
>Introduction to the command language</A
></H1
><P
>When the GCL starts, it first looks for the initialization file
<TT
CLASS="FILENAME"
>gclini.gcl</TT
>
which is a file containing GCL functions, including
function to load the standard user defined functions that are
documented in this manual. If the file cannot be found, a warning
will be issued. Control is then turned over to you, and you will
receive the GCL prompt
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>GCL1:= << </PRE
></TD
></TR
></TABLE
>
The interpreter is ready for your input. Note that
your prompt may be different from the above depending on settings in
your <TT
CLASS="FILENAME"
>gclini.gcl</TT
> file. </P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN534"
>Command line editing</A
></H2
><P
>You can edit the command line by using the arrow keys. The left and
right arrow key move the cursor, the back space or delete key can be
used to delete characters, and the typing characters will enter the
characters in insert mode. The up and down arrow keys can be used to
recall previous lines. </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN537"
>Meaning of the prompt</A
></H2
><P
>The GCL prompt is of the form <TT
CLASS="PROMPT"
>GCLnn:= <<</TT
>.
The prompt is
actually a valid part of a GCL expression, and can be deleted or modified by
the command line editor if so desired. The <TT
CLASS="PROMPT"
><<</TT
>
part of the
prompt is the short form of the <TT
CLASS="FUNCTION"
>Print</TT
> function, which causes
its argument to be displayed.
Backspacing over this part of the command will suppress
output. The <TT
CLASS="PROMPT"
>GCLnn:=</TT
> part of the prompt assigns
the evaluation of the expression
to the variable <TT
CLASS="PROMPT"
>GCLnn</TT
>. Backspacing over
this will prevent saving of the output into a variable.</P
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