ATLAS: BBOX interpreter
An interpreter for the BBOX language
has been written.
GAP version
The GAP version of the interpreter has two commands.
Command: prepareblackbox(filename)
This command loads a BBOX program into memory, transforms it
into an intermediate form ready for executing and
performs a rudimentary syntax check.
If successful, the program returns a structure containing a
BBOX program ready for running.
Command: blackbox(group, program, elements, options)
This command runs a pre-loaded BBOX program on a given group.
The parameters are:
- group
- The group on which the algorithm is to be run;
- program
- The BBOX program (the result of a call to prepareblackbox)
- elements
- A list of elements to become the initial
`numbered' elements. These might be a set of group generators for
example, or it could just be an empty list.
- options
- A record containing various options to control
the execution of the program. No component is mandatory.
The options have the following meanings:
- verbose
- If true, print each instruction before executing.
False by default.
- quiet
- If true, ignore all
echo instructions in
the program. False by default.
- orderfunction
- A function to replace GAP's Order
method. Sometimes useful for large matrix groups, where we substitute
a `vector order' method.
- hardtimeout
- If false, continue after reaching a
timeout instruction (printing a warning). True by default.
- allowbreaks
- If true, allow
break instructions,
otherwise ignore them. True by default.
Magma version
There is currently no Magma version of the interpreter available.
Go to main ATLAS (version 2.0) page.
Version 2.0 created on 31st January 2005 by Simon Nickerson.
Last updated 31.01.05 by SJN.