Hi Florent I am not sure if you mean it is a bug that a + b works or that 2*a doesn't.
The documentation describes a Parent as a set. In these terms the Parent I want is the set of instances of the class G. I don't know how to construct this as a Parent or even if this is allowed. On Sep 2, 12:49 pm, Florent Hivert <florent.hiv...@univ-rouen.fr> wrote: > Hi Bruce, > > > > On Thu, Sep 02, 2010 at 03:33:21AM -0700, Bruce wrote: > > I am trying to construct the fee module on the set of instances of a > > class G. > > I start with > > > M = CombinatorialFreeModule(QQ,G) > > > If f,g are instances of G I then continue with > > > a = M.monomial(f) > > b = M.monomial(g) > > > and I can then form a+a , a+b etc. and a - a is indeed 0. > > > However if I try 2*a I get a TypeError > > > If I try > > > M = CombinatorialFreeModule(QQ,NonNegativeIntegers()) > > > a = M.monomial(3) > > > then 2*a seems to work fine. > > > Can anyone tell me what I am doing wrong and/or explain this? > > I'm in a hurry. so this is only a very short answer. It is maybe a bug but in > the usual usage in > > M = CombinatorialFreeModule(QQ,G) > G is supposed to be an Parent (mathematical object) and ont a class (python > stuff). I'm not sure if this is enforced or not. > > Cheers, > > Florent -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-de...@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
