Interesting command, by the way! Here is what I tried: gap> o := function(x,y) return true; end;; gap> a := [3,2,5,4,7,6,9,8,0,1];; Sort(a,o); a; [ 1, 0, 8, 9, 6, 7, 4, 5, 2, 3 ] gap> :D
Igor 15.09.2012, 01:18, "Robert Morse" <r...@evansville.edu>: > The sort command allows for user defined orderings. > > #Here is a user defined ordering > ord := function(x,y) return x[1]<=y[1]; end; > > # A list > lst := [[3,2,1],[2,5,1]];; > > # Sort using the user defined ordering > Sort(lst,ord); > > # See the result > lst; > #[ [ 2, 5, 1 ], [ 3, 2, 1 ] ] > > Sort([[3,2],1,[2,5,1], ord); > > Robert F. Morse > > On Fri, Sep 14, 2012 at 3:45 PM, Ha T. Lam <hat...@gmail.com> wrote: > >> Dear GAP forum, >> >> I have objects which are lists of 3 elements. I want to keep them sorted >> according to the first elements on the lists, which are integers, but I'm >> not sure what to use as the data structure so that I can make use of GAP's >> sorting algorithm. Is there anyway to use nested lists in this case? I >> looked into Hash, but that only accept non-negative integers. >> >> Do you have any advise? >> >> Best regards, >> >> Ha T. Lam >> _______________________________________________ >> 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 _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
