On Sun, Jan 11, 2015 at 5:49 PM, Andrew Russell <andrew.russell...@gmail.com> wrote: > I'm running Sage 6.4.1 on OS X (Yosemite). Creating a finite, connected DAG > with n vertices (for any n that I tried) returned +Infinity. EG: > > sage: digraphs.Path(10).diameter() > +Infinity > > or even > > sage: digraphs.ButterflyGraph(5).diameter() > +Infinity > > However, both of these Path and Butterfly graphs are finite, connected, > directed acyclic graphs so their diameter should always be finite. I need > to be able to compute the largest diameter of the connected components of > any finite DAG, yet the diameter method fails even on these simple cases. >
Seems to me to work as documented (using Gamma.diameter? or Gamma.diameter??): sage: Gamma = digraphs.Path(3) sage: Gamma.diameter() +Infinity sage: Gamma.eccentricity(0) 2 sage: Gamma.eccentricity(1) +Infinity sage: Gamma = digraphs.Circuit(3) sage: Gamma.diameter() 2 sage: Gamma.eccentricity(0) 2 sage: Gamma.eccentricity(1) 2 sage: Gamma.eccentricity(2) 2 > -- > You received this message because you are subscribed to the Google Groups > "sage-support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-support+unsubscr...@googlegroups.com. > To post to this group, send email to sage-support@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-support. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
