I've asked him in fact, but he is currently not working on it. Bosman's code certainly performs well on the case which has been done by him. This error occurs only on my computation, which seems too cumbersome as far as it goes. Anyway, thanks for all your advice.
On Wednesday, February 27, 2013 6:17:33 PM UTC+1, John Cremona wrote: > > Try asking Bosman directly; I don't know if he reads this list. > > John > > On 27 February 2013 15:23, Peng <tianpen...@gmail.com <javascript:>> > wrote: > > Dear John Cremona, > > Thanks for your reply. > > > > For n=45000 or smaller, it works well and gives an output. Then the next > > number I tried is 50000 and this gave an Error. > > > > In sage 5.7, this doesn't work neither. > > > > I even don't know yet why this happens exactly. > > > > PS: > > I'm trying to compute the modular Galois represtations of Ramanujan tau > > function using the algorithm by Johan Bosman, which requests a huge > > precision for q-expansion of modular forms used inside the code. > Actually, > > this error happens when I ran Bosman's code and sage indicates that > > HeilbronnMere went wrong in this case. > > > > > > > > On Wednesday, February 27, 2013 2:26:55 PM UTC+1, John Cremona wrote: > >> > >> I cannot think of a reason for computing Heilbronn matrices of such > >> large index, so you have one? And how does it perform for smaller n, > >> say 1000, 10000, 20000, ...? > >> > >> Lastly, Sage-5.7 has been released so you should upgrade (but I am not > >> saying if any relevant code has changed between 5.4.1 and 5.7, as I > >> have not checked). > >> > >> John > >> > >> On 27 February 2013 11:32, Peng <tianpen...@gmail.com> wrote: > >> > Dear all, > >> > > >> > I've tried to compute Heilbronn Matrices for n=50000 in sage 5.4.1, > but > >> > the > >> > following Error comes out when I run > >> > > >> > sage: H=HeilbronnMerel(50000) > >> > > >> > -------------------------------------------------------------------- > >> > > >> > RuntimeError Traceback (most recent call last) > >> > > >> > /home/guests/sage-5.4.1/<ipython console=""> in <module>() > >> > > >> > > >> > > /home/guests/sage-5.4.1/local/lib/python2.7/site-packages/sage/modular/modsym/heilbronn.so > > > >> > in sage.modular.modsym.heilbronn.HeilbronnMerel.__init__ > >> > (sage/modular/modsym/heilbronn.c:5185)() > >> > > >> > > >> > > /home/guests/sage-5.4.1/local/lib/python2.7/site-packages/sage/modular/modsym/heilbronn.so > > > >> > in sage.modular.modsym.heilbronn.HeilbronnMerel._initialize_list > >> > (sage/modular/modsym/heilbronn.c:5343)() > >> > > >> > RuntimeError: Floating point exception > >> > > >> > -------------------------------------------------------------------- > >> > > >> > It seems to be a bug in sage when computing Heilbronn Matrices for > large > >> > n. > >> > However, I even couldn't find out why this happens. Anybody can > please > >> > help > >> > me handle with that? Thank you. > >> > > >> > > >> > Best regards! > >> > > >> > -- > >> > You received this message because you are subscribed to the Google > >> > Groups > >> > "sage-devel" group. > >> > To unsubscribe from this group and stop receiving emails from it, > send > >> > an > >> > email to sage-devel+...@googlegroups.com. > >> > To post to this group, send email to sage-...@googlegroups.com. > >> > Visit this group at http://groups.google.com/group/sage-devel?hl=en. > >> > For more options, visit https://groups.google.com/groups/opt_out. > >> > > >> > > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "sage-devel" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to sage-devel+...@googlegroups.com <javascript:>. > > To post to this group, send email to > > sage-...@googlegroups.com<javascript:>. > > > Visit this group at http://groups.google.com/group/sage-devel?hl=en. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
