#17130: Coercion after _eval_() in symbolic functions
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by kcrisman):
Just to clarify, you mean that the precision of the less precise input
(`1.0`) is used, but then for some reason this is sent back to the
precision of the first one?
My guess is that
[http://git.sagemath.org/sage.git/tree/src/sage/symbolic/function.pyx#n919
this line] is to blame.
{{{
# we want to convert the result to the original parent if the
input
# is not exact, so we store the parent here
org_parent = parent_c(args[0])
}}}
I don't have time right now to check this out, but I would not be at all
surprised. Or it's the `super` call just above that, I don't myself 100%
understand how the inheritance works, and I keep forgetting when `eval`
versus `call` are called in the functions. You could try other functions
with multiple arguments and see if the same problem happens, or try to
reverse the precisions and see what happens to test this hypothesis.
--
Ticket URL: <http://trac.sagemath.org/ticket/17130#comment:1>
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