#18092: evaluating symbolic expressions (without conversion to SR, i.e.,
staying in
ring of values)
-------------------------+-------------------------------------------------
Reporter: | Owner:
dkrenn | Status: needs_review
Type: | Milestone: sage-6.6
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
symbolics | Work issues:
Keywords: | Commit:
Authors: | c3696a81f65df6e64c5e2bcbdf8905d4f2d5b796
Daniel Krenn | Stopgaps:
Report Upstream: N/A |
Branch: |
u/dkrenn/SR/eval |
Dependencies: |
-------------------------+-------------------------------------------------
Comment (by rws):
{{{
+ The reason is that :meth:`subs` convert its arguments to the
+ symbolic ring, so we even have::
+
+ sage: x.subs(x=RIF(3.42)).parent()
+ Symbolic Ring
+
+ The :meth:`evaluate`-method prevents this conversion and
}}}
I think you misunderstand. `x` is not converted, it is wrapped in an
expression:
{{{
sage: x.subs(x=RIF(3.42)).pyobject().parent()
Real Interval Field with 53 bits of precision
}}}
I have no idea if your idea is worth the effort, but suspect that not if
it is only based on the necessity to prevent "conversion".
--
Ticket URL: <http://trac.sagemath.org/ticket/18092#comment:4>
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