#20739: Make snappy an optional package
-------------------------------------+-------------------------------------
Reporter: vdelecroix | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.3
Component: packages: | Resolution:
optional | Merged in:
Keywords: days74 | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: public/20739 | be1b40d99510bbbeeacc60b66fd0fcf8e8a3a03f
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
As a first step, Nathan tought us the `sage_link` method
{{{
sage:
sage: import snappy
sage: L = snappy.Link('K10n11')
sage: K = L.sage_link()
sage: K.alexander_polynomial()
-t^-3 + 5*t^-2 - 9*t^-1 + 11 - 9*t + 5*t^2 - t^3
sage: L.alexander_polynomial()
t^6 - 5*t^5 + 9*t^4 - 11*t^3 + 9*t^2 - 5*t + 1
}}}
And there is a nice conversion from Sage link to SnapPy handled
automatically
{{{
sage: B = BraidGroup(8)
sage: K = Link(B([-1, -1, -1, -2, 1, -2, 3, -2, 3]))
sage: L = snappy.Link(K)
}}}
This might already help for:
- double checking the outputs (from both sides)
- comparing the implementations
To enhance it further we could make work the natural conversion the other
way around
{{{
sage: L = snappy.Link('K10n11')
sage: Link(L)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20739#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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