For the record, I ran into more or less the same phenomenon a couple of days ago, and again floor() was the culprit.
Kiran On Apr 6, 1:16 pm, mabshoff <[EMAIL PROTECTED] dortmund.de> wrote: > On Apr 6, 7:05 pm, Jaap Spies <[EMAIL PROTECTED]> wrote: > > > > > mabshoff wrote: > > > > On Apr 6, 6:36 pm, Jaap Spies <[EMAIL PROTECTED]> wrote: > > >> In the notebook of sage-2.11: > > > >> time plot(1.0 - x * floor(1/x), (x,0.00001,1.0) > > > >> CPU time: 143.77 s, Wall time: 1660.39 s > > > >> with a correct image. > > > >> Maple is almost immediate. > > > >> Even worse: > > >> time plot(1.0 - x * floor(1/x), (x, 0.0, 1.0), plot_points=1000) > > > >> CPU time: 244.71 s, Wall time: 5155.23 s > > > >> Thoughts? See trac ticket #2831 > > > > Hi Jaap, > > > > The problem is that "floor(1/x)" calls maxima. If you drop it the > > > whole thing takes about a second. > > > Yes, I know. But why should I drop it, if this is what I want to plot! > > This indicates that _fast_eval is not used. I assume it doesn't have a > floor() method or if it has one it isn't used. That is the bug. > > > Jaap > > Cheers. > > Michael --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
