On Thu, Apr 28, 2011 at 11:57 AM, kcrisman <[email protected]> wrote: > > > On Apr 28, 10:49 am, Maarten Derickx <[email protected]> > wrote: >> I think that somewhere the factor with which you multiply is checked >> for being -1,0 or 1 and that that causes the problem. >> Here is at least an easier way to reproduce the problem >> >> sage: var('y') >> y >> sage: (y*(-3.0),y*(-2.0),y*(-1.0),y*0.0,y*1.0,y*2.0,y*3.0,y*4.0) >> (-3.00000000000000*y, -2.00000000000000*y, -y, 0, y, >> 2.00000000000000*y, 3.00000000000000*y, 4.00000000000000*y) >> sage: 1.0==1 >> True > > Yes, but my question is whether it's a bug or a feature? Sorry for > not being clear.
I think it really boils down to the fact that the symbolic ring doesn't understand the notion of exact vs. inexact values. E.g. sage: 3.0*x 3.00000000000000*x sage: 2.0*x 2.00000000000000*x sage: 3.0*x - 2.0*x x - Robert -- To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
