#12533: arbitrary precision LP solver backend
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Reporter: dimpase | Owner: ncohen
Type: enhancement | Status: positive_review
Priority: major | Milestone: sage-pending
Component: linear programming | Resolution:
Keywords: arbitrary precision, LP | Work issues:
Report Upstream: N/A | Reviewers: David Coudert,
Nathann Cohen, Dmitrii Pasechnik
Authors: Risan | Merged in:
Dependencies: #12553, #13646 | Stopgaps:
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Comment (by dimpase):
Replying to [comment:76 vbraun]:
> The coefficients are currently only converted to the base ring if the
coercion system is required.
But here RDF is the wrong ring to convert to. With your latest patch I
get:
{{{
sage: p = MixedIntegerLinearProgram(solver='ppl')
sage: x = p.new_variable()
sage: 2 * x[1]
2.0 x_0
sage:
}}}
which breaks the ppl backend, as 2.0 is RDF. How one is supposed to enter
the system without the (wrong) conversion?
It would help a lot if you at least outline the functionality you need in
backends to make this work properly in some detail.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12533#comment:77>
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