User flags.

  You may change the behaviour of ALGB by clearing or setting some user flags (and the system flag -27). Here are the most important flags of ALGB:

• flag 1: display flag (if set then verbose mode selected)
• flag 12: simplification flag (if set then ALGB calls the gcd algorithm if needed)
• flag 13: complex flag (if cleared, all expressions are assumed to be real and ALGB tries to return only real expressions)
• flag 15: real are integer flag (if set, real are assumed to be integer)
• flag 17: internal flag (if set, all data are assumed to be internal)
• flag 21: recurse flag (if set, the simplification algorithms EXPA and TSIMP will simplify in subexpressions)
• system flag -27: if set, then the user representation of complex numbers is symbolic.

To set a flag (say flag 12), type 12 SF. To clear a flag, type 12 CF. To reset ALGB flag to their defaut values