On Jan 4, 2008 9:33 AM, bill purvis <[EMAIL PROTECTED]> wrote:
>
> On Friday 04 January 2008, harald schilly wrote:
> > I don't know - looks like rounding errors, but it seems you are more
> > interested in symbolic calculations.
> > try:
> >
> > z = I
> > z^2
> > and
> > z*z
> >
> > also read I? and ComplexField?
> >
> > h
> >
> > On Jan 4, 3:51 pm, mb <[EMAIL PROTECTED]> wrote:
> > > Hi,
> > >
> > > Is the following a bug?
> > >
> > > sage: z=complex(0,1)
> > > sage: z
> > > 1j
> > > sage: z*z
> > > (-1+0j)
> > > sage: z^2
> > > (1+1.967934973691981e-310j)
> > >
> > > --mb
> >
> Pretty gross rounding error to get +1 instead of -1.
>
> Just checked it on my 2.9.0.
This is clearly a serious bug.
I've made it trac #1681:
http://trac.sagemath.org/sage_trac/ticket/1681
William
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