#20303: Fixes for add_variables in CVXOPT, PPL, GLPK MIP backends
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Reporter: mkoeppe | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.2
Component: numerical | Resolution:
Keywords: lp, CVXOPT, PPL, | Merged in:
GLPK | Reviewers:
Authors: Matthias Koeppe | Work issues:
Report Upstream: N/A | Commit:
Branch: | 183ce259998f1a014054045bcad6499f35ac978c
u/mkoeppe/fixes_for_the_cvxopt_mip_backend| Stopgaps:
Dependencies: |
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Changes (by mkoeppe):
* cc: vdelecroix (added)
* keywords: lp, CVXOPT => lp, CVXOPT, PPL, GLPK
* status: needs_work => needs_review
Old description:
> Is anyone using the CVXOPT backend? (See #18572) (Not me.)
>
> While working on other backends, just by looking at the code, I noticed
> some issues, see branch. Clearly more doctests need to be added.
> (Also see #20302 for a discussion regarding doctests for the backends.)
New description:
The `add_variables` method had defects for the CVXOPT, PPL, GLPK.
See new tests.
I first noticed it with the CVXOPT backend. Then, by copying the same
doctests to the other doctests, I found more errors in PPL, GLPK backends.
(See #20302 for a discussion regarding doctests for the backends -- there
should be a better way than relying on copy-paste discipline.)
Note, I have copied the doctests to the CPLEX or Gurobi backends but am
currently not able to run them.
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Ticket URL: <http://trac.sagemath.org/ticket/20303#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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