Hi 26 Sep 2014, +8:00, 14:00-15:00 i will try type return;to continue run the command.and i suddenly have an idea to do combination of index which means using a sequence of number [1..Len(matrixlist)]to calculate the full combination of ideal listi guess it may be possible to run successfully. Regards, Martin
> Subject: Re: [GAP Forum] which function of dictionary can use polynomial or > function as key, how many memory > From: hul...@math.colostate.edu > Date: Thu, 25 Sep 2014 08:52:48 -0600 > CC: fo...@gap-system.org > To: tesl...@hotmail.com > > Dear Lee Martin, > > [I suggest that further discussion on these issues is not sent to the forum@, > mail address, which copies to hundreds of subscribers, but to support@] > > > How to edit the value of dictionary? > > How to append a function to a list which is a value of dictionary? > > The values of a dictionary are immutable and cannot be changed (cleanly), so > this is not possible. > > Concerning the memory problems you reported, did you by any chance get the > error message: > exceeded the permitted memory (`-o' command line option) > > If so, you can find a description under > > http://mail.gap-system.org/pipermail/forum/2010/002986.html > > Regards, > > Alexander Hulpke > > > > > > Regards, > > > > Martin > > > > > Subject: Re: [GAP Forum] which function of dictionary can use polynomial > > > or function as key > > > From: hul...@math.colostate.edu > > > Date: Wed, 24 Sep 2014 09:27:04 -0600 > > > CC: fo...@gap-system.org > > > To: tesl...@hotmail.com > > > > > > Dear Forum, > > > > > > On Sep 24, 2014, at 9/24/14 3:21, Lee Martin CCNP <tesl...@hotmail.com> > > > wrote: > > > > > > > would like to use rational function as key in dictionary like table > > > > function in maple > > > > which function is a dictionary can use function as key and value as > > > > list to store ideals. > > > > > > Lookup dictionaries currently work with rational functions, e.g: > > > > > > gap> > > > R:=PolynomialRing(Rationals,["x","y","z"]);AssignGeneratorVariables(R); > > > Rationals[x,y,z] > > > #I Assigned the global variables [ x, y, z ] > > > > > > gap> d:=NewDictionary(x,true); > > > <object> > > > gap> AddDictionary(d,x,1); > > > gap> AddDictionary(d,y,2); > > > gap> LookupDictionary(d,x); > > > 1 > > > gap> LookupDictionary(d,z); > > > fail > > > gap> AddDictionary(d,x/y,2); > > > gap> LookupDictionary(d,z); > > > fail > > > gap> LookupDictionary(d,x/y); > > > 2 > > > > > > Instead of numbers you should be able to store arbitrary associated > > > information. However internally lists will be made immutable, so if your > > > ideal list is expected to grow you would need to keep a separate > > > (mutable) list of the ideal lists, storing only an index in the > > > dictionary. > > > > > > I note that > > > > > > gap> RepresentationsOfObject(d); > > > [ "IsComponentObjectRep", "IsDictionaryDefaultRep", "IsListDictionary", > > > "IsListLookupDictionary", "IsSortDictionary", "IsSortLookupDictionary" ] > > > > > > this currently uses sorted lists internally and not yet hashing. To > > > enable hashing, one would have to add a method for SparseHashKey for > > > rational functions, which currently is not on the list of features. > > > > > > Best, > > > > > > Alexander Hulpke > > > > > > > > > > Regards, > > > > Martin > > > > _______________________________________________ > > > > Forum mailing list > > > > Forum@mail.gap-system.org > > > > http://mail.gap-system.org/mailman/listinfo/forum > > > > _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
