On Jul 10, 2009, at 3:01 AM, Dag Sverre Seljebotn wrote: > Robert Bradshaw wrote: >> On Jul 9, 2009, at 3:36 AM, Robert Bradshaw wrote: >> >>> See http://trac.sagemath.org/sage_trac/ticket/5081 . >>> >>> sage: numpy.array([1, 10, 100]).dtype >>> dtype('int64') >> >> Following up on this, I've also posted http://trac.sagemath.org/ >> sage_trac/ticket/6506 . This brings up an interface question, and I >> thought I'd bring it up here. With the latest patch, we have the >> following behavior: >> >> Integer -> long (if it fits), then int64 (if it fits) and object >> otherwise >> Real/Complex -> float64 (if it's less than 57 bits, which is the >> cuttoff for RealNumber(repr(float(x))), and object for greater prec >> Rational -> same as Integer for integral, float64 otherwise >> >> I figured this is mostly for numerical use (whenever I import numpy, >> that's the mode I'm in), and the real advantage of numpy is when >> using native types. If I want exact linear algebra then I'd be using >> Sage types anyways, not numpy. Does this seem reasonable? > > Sounds reasonable to me. > > I must say I disagree rather strongly with your view of NumPy > though. The > real advantage of NumPy (for certain purposes) is the semantics, > which is > not focused around doing linear algebra at all. (I've written about > this > at length earlier though so won't repeat myself.)
That is a good point. I should have said "whenever I use NumPy/ SciPy." It's probably still fair to say that the "average" (whatever that means) NumPy users as a whole is more concentrated around the numerics side of things than the "average" Sage user, but you're right that the power of ndarray is about its broadcasting, slicing, etc. > BTW, thanks a lot for looking at these issues, it looks promising! > Come > autumn I'll make a serious attempt at using Sage proper and report > back > (or even provide a patch) if I still give it up. Good to hear. - Robert --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
