#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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Description changed by jdemeyer:
Old description:
> This uses coercion correctly:
> {{{
> sage: bessel_Y._eval_(RealField(300)(1), 1.0)
> -0.781212821300289
> }}}
>
> However, it seems that `__call__()` coerces this result back to the first
> parent, giving false precision:
> {{{
> sage: bessel_Y(RealField(300)(1), 1.0)
> -0.781212821300288684511770043172873556613922119140625000000000000000000000000000000000000000
> }}}
New description:
This uses coercion correctly:
{{{
sage: bessel_Y._eval_(RealField(300)(1), 1.0)
-0.781212821300289
}}}
However, it seems that `__call__()` coerces this result back to the first
parent, giving false precision:
{{{
sage: bessel_Y(RealField(300)(1), 1.0)
-0.781212821300288684511770043172873556613922119140625000000000000000000000000000000000000000
}}}
Same issue with functions which are evaluated using Maxima, which does not
support arbitrary precision:
{{{
sage: R=RealField(300); elliptic_eu(R(1/2), R(1/8))
0.495073732023201484864216581627260893583297729492187500000000000000000000000000000000000000
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17130#comment:5>
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