#20315: Plot knots, build knots documentation when CPLEX is installed
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Reporter: jhpalmieri | Owner:
Type: defect | Status: needs_review
Priority: blocker | Milestone: sage-7.2
Component: documentation | Resolution:
Keywords: | Merged in:
Authors: John Palmieri | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/jhpalmieri | Commit:
/knot-pix | 503211d6593e84c98d4c3a3dd8171d5786df38b6
Dependencies: | Stopgaps:
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Description changed by vdelecroix:
Old description:
> The presence of the solver `CPLEX` breaks plotting of knots and links:
> see [https://groups.google.com/d/msg/sage-devel/ryq2Pmn_lRY/a3twFJNUDwAJ
> sage-devel].
>
> Minimal example
> {{{
> sage: L = Link([[2,1,4,5], [5,6,7,3], [6,4,1,9], [9,2,3,7]])
> sage: L.plot()
> Traceback (most recent call last):
> ...
> MIPSolverException: 'CPLEX: The primal has no feasible solution'
> }}}
> the corresponding LP problem is
> {{{
> Maximization:
> - x_0 - x_1 - x_2 - x_3 - x_4 - x_5 - x_6 - x_7 - x_8 - x_9 - x_10 -
> x_11
> Constraints:
> 2.0 <= x_2 - x_3 - x_8 + x_9 <= 2.0
> 2.0 <= - x_0 + x_1 + x_6 - x_7 <= 2.0
> 2.0 <= - x_4 + x_5 + x_10 - x_11 <= 2.0
> 1.0 <= x_0 - x_1 + x_4 - x_5 + x_8 - x_9 <= 1.0
> }}}
New description:
The presence of the solver `CPLEX` breaks plotting of knots and links: see
[https://groups.google.com/d/msg/sage-devel/ryq2Pmn_lRY/a3twFJNUDwAJ sage-
devel].
Minimal example
{{{
sage: L = Link([[2,1,4,5], [5,6,7,3], [6,4,1,9], [9,2,3,7]])
sage: L.plot()
Traceback (most recent call last):
...
MIPSolverException: 'CPLEX: The primal has no feasible solution'
}}}
the corresponding LP problem is
{{{
- x_0 - x_1 - x_2 - x_3 - x_4 - x_5 - x_6 - x_7 - x_8 - x_9 - x_10 -
x_11 - x_12 - x_13 - x_14 - x_15 - x_16 - x_17 - x_18 - x_19
Constraints:
0.0 <= x_0 - x_4 <= 0.0
0.0 <= x_1 - x_5 <= 0.0
0.0 <= - x_10 + x_12 <= 0.0
0.0 <= - x_3 + x_11 <= 0.0
0.0 <= - x_2 + x_3 <= 0.0
0.0 <= x_6 <= 0.0
0.0 <= x_2 - x_14 <= 0.0
0.0 <= x_1 - x_15 + x_16 <= 0.0
0.0 <= x_0 - x_17 <= 0.0
0.0 <= x_13 - x_16 <= 0.0
0.0 <= x_7 - x_9 <= 0.0
0.0 <= - x_5 + x_8 - x_18 <= 0.0
0.0 <= x_6 - x_18 <= 0.0
0.0 <= - x_4 + x_19 <= 0.0
}}}
--
--
Ticket URL: <http://trac.sagemath.org/ticket/20315#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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