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 <javascript:>> > 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 <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.
