#18805: Add didactical implementation of tableau cutting planes to
interactive_simplex_method
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Reporter: mkoeppe | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.8
Component: numerical | Resolution:
Keywords: | Merged in:
Authors: Peijun Xiao | Reviewers: Andrey Novoseltsev
Report Upstream: N/A | Work issues: doc format
Branch: | Commit:
u/mkoeppe/add_didactical_implementation_of_tableau_cutting_planes_to_interactive_simplex_method|
9e079d4bf46cad3d9d60bf1fed8864200b361f4d
Dependencies: #18742, #19097 | Stopgaps:
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Comment (by novoselt):
Separate tickets for separate problems are always better ;-)
The sensitivity analysis methods require some careful thinking for fitting
in into existing framework where:
- problems are thought to be immutable (and I think it is a good decision
in line with how other stuff in Sage works), so adding/removing
constraints to them should return a new problem with augmented matrices
etc;
- dictionaries are mutable, but are supposed to always represent the same
problem;
- regular dictionaries are standalone entities that are not aware of "the
original problem", which makes sense since they carry all the information,
while revised dictionaries do remember the problem, which also makes sense
since they rely on its data for computing necessary stuff.
It probably makes sense to have something like
`problem.add_stuff(stuff_to_add, dictionary=None)` which returns the new
problem and, optionally given a dictionary for the old problem, also a
related dictionary for the new problem.
--
Ticket URL: <http://trac.sagemath.org/ticket/18805#comment:27>
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