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
-~----------~----~----~----~------~----~------~--~---
