Thanks a lot for checking up on this, Robert!
This is now bug #2604950 in Maxima.
Stan
On Feb 13, 7:04 pm, Robert Dodier <robert.dod...@gmail.com> wrote:
> On Feb 13, 2:09 am, Stan Schymanski <schym...@gmail.com> wrote:
>
> > sage: sage: var('a b c')
> > (a, b, c)
> > sage: ((a*b - 0.5*a*(b - c))/a).simplify_radical()
> > 0
>
> I guess Sage has keepfloat=true somewhere.
> That seems to trigger a bug in Maxima.
>
> (%i7)radcan((a*b - 0.5*a*(b - c))/a), keepfloat=true;
> (%o7) 0
> (%i8)radcan((a*b - 0.5*a*(b - c))/a), keepfloat=false;
>
> `rat' replaced -0.5 by -1/2 = -0.5
> (%o8) (c+b)/2
>
> If you have time please submit a bug
> report.http://sourceforge.net/tracker/?func=add&group_id=4933&atid=104933
>
> Does python have a built-in rational type?
> If so maybe that would obviate keepfloat.
> Maxima would rather work in exact numbers FWIW.
>
> Robert Dodier
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