On Wed, Jan 20, 2016 at 2:02 PM, Vincent Delecroix
<20100.delecr...@gmail.com> wrote:
> Sorry... I found out! We can implement a _pushout_ in the parent. Very
> simple. Sorry for the noise.
For completeness (when somebody finds this via a search) if you follow
the trac ticket, you'll see the nice simple code Vincent just wrote:
def _pushout_(self, other):
r"""
Implement a pushout with real interval fields
TESTS::
sage: c = ComplexIntervalField(128).an_element()
sage: r = RealIntervalField(64).an_element()
sage: c + r
1 + 1*I
sage: r + c
1 + 1*I
sage: parent(c+r)
Complex Interval Field with 64 bits of precision
"""
from sage.rings.real_mpfi import RealIntervalField_class
if isinstance(other, RealIntervalField_class):
prec = min(self.prec(), other.prec())
return ComplexIntervalField(prec)
Indeed, that is very nice, and it's hard to imagine something simpler.
Great job people who designed this (Robert Bradshaw et al.)!
> Vincent
>
>
> On 20/01/16 18:50, Vincent Delecroix wrote:
>>
>> Hello,
>>
>> I would like to make the following works (see #19922)
>> {{{
>> sage: c = ComplexIntervalField(128).an_element()
>> sage: r = RealIntervalField(64).an_element()
>> sage: c + r
>> 1 + 1*I
>> sage: parent(_)
>> Complex Interval Field with 64 bits of precision
>> }}}
>> (currently we got a type error)
>>
>> I am not sure how to proceed with coercions at this point as a new ring
>> needs to be created... any hint?
>>
>> Cheers,
>> Vincent
>
>
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