Hi,
On Sun, 1 Nov 2009 03:54:05 -0800 (PST)
Vincent Delecroix <20100.delecr...@gmail.com> wrote:
> I agree that sqrt(2) > 1 ;) the problem is the one Jason has
> developed : the comparison returns a symbolic expression !
>
> Morever, It works well for min and max functions :
> {{{
> sage: max(sqrt(2), 1)
> sqrt(2)
> sage: min(sqrt(2), 1)
> 1
> }}}
I am not sure if it's a coincidence that you get the right answer. I
guess max() uses __richcmp__ and not __cmp__. The implementation of
__richcmp__ for symbolic expressions creates symbolic relations,
whereas __cmp__ calls an internal comparison function in pynac.
sage: cmp(sqrt(2),SR(1))
1
sage: cmp(sqrt(2),SR(2))
1
> Why max(sqrt(2), 1) not a symbolic expression ?
There is a ticket to provide symbolic max and min functions here:
http://trac.sagemath.org/sage_trac/ticket/6949
Cheers,
Burcin
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