#15583: sage.numerical.linear_functions.LinearConstraint is not a hashable type
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Reporter: cbowen | Owner:
Type: PLEASE | Status: new
CHANGE | Milestone: sage-6.1
Priority: trivial | Keywords: linear constraint, mixed
Component: linear | integer linear program
programming | Authors:
Merged in: | Report Upstream: N/A
Reviewers: | Branch:
Work issues: | Dependencies:
Commit: |
Stopgaps: |
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Hello,
I'd like to have sage.numerical.linear_functions.LinearConstraint to be a
hashable type for the following reasons:
1) When adding constraints to an instance of a MixedIntegerLinearProgram,
it is not necessary to add the same or equivalent constraint multiple
times. A hash could be used to determine distinct linear constraints that
are added into a MILP instance.
2) By having hashable linear constraints, one could allow for linear
constraints to be added into sets
(http://docs.python.org/2/library/sets.html) or used as keys in
dictionaries.
Thanks,
Clinton
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Ticket URL: <http://trac.sagemath.org/ticket/15583>
Sage <http://www.sagemath.org>
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