On Sun, Feb 8, 2009 at 1:27 AM, mabshoff <mabsh...@googlemail.com> wrote: > > > > On Feb 8, 1:18 am, Rob Beezer <goo...@beezer.cotse.net> wrote: >> William, >> >> Thanks for all the helpful advice - that'll get me started. >> >> > So you're saying that when somebody changed from Sage just having >> > "kernel" (the way I implemented it) to having left_kernel and >> > right_kernel methods, they messed things up in such a way that >> > left_kernel is 1000 times slower than right kernel for the above >> > example? >> >> Well, I think maybe the actual mess-up-factor is O(n^2) or O(n^3) or >> something like that. :-) >> >> I'll start at the top in matrix2.pyx and it should be straightforward >> to get the left/right dichotomy straightened out. That should then >> make my grander plans easier. >> >> Regarding a doctest. I know they can be tagged as "random" (can't >> recall the details at the moment), > > Why? No doctest should be tagger #random unless it can be absolutely > avoided. Maybe you meant #long? But it is is quick there is no point > to do so.
I suspect that Rob doesn't know that if one writes a doctest like this: sage: a = random_matrix(ZZ,200) sage: d = a.det() then it is 100% deterministic. In Sage, before every doctest block, the random number generator is reset. >> so it would be appropriate to put >> in a large random example that *should* finish quickly? Is there a >> mechanism to determine if it runs too long? Or do we just assume >> somebody notices the delay? If a doctest -- such as computing that kernel over QQ -- goes from 1 seconds to suddenly taking 1000 seconds, it seems likely somebody would notice the delay. There is no mechanism to specify that a doctest must take less than n seconds. William --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
