#11888: Sage is missing the lambert_w function
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Reporter: benjaminfjones |
Owner: burcin
Type: defect |
Status: needs_review
Priority: minor |
Milestone: sage-5.1
Component: symbolics |
Resolution:
Keywords: lambert_w symbolics conversion maxima sd35.5 sd40.5 | Work
issues:
Report Upstream: N/A |
Reviewers: Keshav Kini, Karl-Dieter Crisman, Fredrik Johansson, Burcin Erocal
Authors: Benjamin Jones |
Merged in:
Dependencies: |
Stopgaps:
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Comment (by dsm):
After some real-world discussions, I'd prefer to avoid falling into Python
ints for (some of) the special values:
{{{
sage: parent(lambert_w(0))
Integer Ring
sage: parent(lambert_w(e))
<type 'int'>
sage: parent(lambert_w(-1/e))
<type 'int'>
sage: parent(lambert_w(SR(-1/e)))
<type 'int'>
sage: parent(lambert_w(SR(0)))
Integer Ring
}}}
Mysteriously enough, instrumenting it reveals that `_eval_` is actually
returning SR(1) which then in some part of the code I don't understand
becomes int(1) before we get it back. If we explicitly return Integer(1)
then it seems to stay as Integer(1). This isn't the biggest deal in the
world but there have been several bug reports caused by something falling
out of Sagespace into Pythonspace.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11888#comment:52>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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