Dear Mattew, IsBound(q) would do just what you need. Best, Dmitrii 2009/7/31 Matthew Fayers <m.fay...@qmul.ac.uk>: > Dear forum, > > I have a custom package containing lots of functions that I use frequently, > that I usually read into GAP at the start of every session. Since I > frequently use polynomials in one variable, one of the first lines of this > package is > > q:=Indeterminate(Rationals,"q"); > > The trouble is, if I modify the package and then re-read it into the session, > GAP reads the line above again and assigns two indeterminates, both called q. > This causes problems for functions that refer to q. > > Is there a way around this, apart from closing a re-opening GAP every time I > update my package? For example, is there a way to modify the above line so > that it says something like "if q is not already assigned, let it be an > indeterminate"? > > Matt. > > _____________________________________________________________________________________________ > Matthew Fayers > School of Mathematical Sciences > Queen Mary, University of London > Mile End Road > London E1 4NS > 020 7882 5479 > > _______________________________________________ > Forum mailing list > Forum@mail.gap-system.org > http://mail.gap-system.org/mailman/listinfo/forum >
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