On 20/01/16 22:35, William Stein wrote:
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.)!
For completeness, this feature with _pushout_ method was introduced more
recently in #18182.
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