Dear Matthew Fayers, 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.
What you can do is to use instead the internal number of the
indeterminate (it just will be your taks to make sure that different
variables have diferent numbers). This will ensure that you get every
time the same object:
q:=Indeterminate(Rationals,1);
Then use `SetName' to assign the name. (This is safe for reloading, as
long as the name being reassigned is the same.)
SetName(q,"q");
The next major release of GAP will contain an option to specify in a
call like your original one whether you want the same variable if
possible.
I hope this helps,
Alexander Hulpke
-- Colorado State University, Department of Mathematics,
Weber Building, 1874 Campus Delivery, Fort Collins, CO 80523-1874, USA
email: hul...@math.colostate.edu, Phone: ++1-970-4914288
http://www.math.colostate.edu/~hulpke
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