On Wed, May 13, 2009 at 11:23 PM, Alex Ghitza wrote: > > On Thu, May 14, 2009 at 1:19 PM, Bill Page wrote: >> >> On Wed, May 13, 2009 at 10:46 PM, Mike Hansen wrote: >>> >>> On Wed, May 13, 2009 at 6:58 PM, Bill Page wrote: >>>> >>>> Can someone explain this apparently inconsistent result? >>> >>> It's just operator precedence: >>> >>> sage: -(2.0^(1/3)) >>> -1.25992104989487 >>> sage: (-2.0)^(1/3) >>> 0.629960524947437 + 1.09112363597172*I >>> >> >> Clear. Thanks. Why this particular root? >> > > I believe that it is the real 3rd root of 2 times the "natural" > primitive 6th root of 1, i.e. exp(2*pi*i/6). >
In most cases (e.g. plot) isn't the real root more desirable? --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
