#20656: MixedIntegerLinearProgram: Remove _variables dictionary
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Reporter: mkoeppe | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.3
Component: numerical | Keywords: lp
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies: #20461, #20462
Stopgaps: |
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The '_variables' attribute dictionary maps a "variable" (an "element" of a
`MIPVariable` "dictionary") to an index in the backend. This is redundant
because these "variables" are elements of type `LinearFunction`, and as
such know their index in the backend already.
{{{
sage: p = MixedIntegerLinearProgram(solver='GLPK')
sage: pv = p.new_variable(nonnegative=True)
sage: pv[0]
x_0
sage: pv[77]
x_1
sage: pv[0].dict().keys()
[0]
sage: pv[77].dict().keys()
[1]
}}}
See also: #20461, #20602
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Ticket URL: <http://trac.sagemath.org/ticket/20656>
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