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MixedIntegerLinearProgram: New generator method 'variables' #31749

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mkoeppe opened this issue Apr 28, 2021 · 3 comments
Open

MixedIntegerLinearProgram: New generator method 'variables' #31749

mkoeppe opened this issue Apr 28, 2021 · 3 comments
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c: linear programming p: major / 3 t: enhancement

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mkoeppe commented Apr 28, 2021

We modify MixedIntegerLinearProgram.new_variable so that it remembers the variables.

To avoid reintroducing reference loops eliminated in #12616, we modify MIPVariable so that it no longer stores a reference to the MIP but rather to the backend, the base_ring, and the linear_functions_parent.

A new method M.variables() yields all MIPVariable instances that have been created using M.new_variable() in the order of their creation.

Depends on #20656

CC: @yuan-zhou @sagetrac-tmonteil @tscrim

Component: linear programming

Branch: u/mkoeppe/mixedintegerlinearprogram__new_generator_method__variables_

Issue created by migration from https://trac.sagemath.org/ticket/31749
@mkoeppe mkoeppe added this to the sage-9.4 milestone Apr 28, 2021
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mkoeppe commented Apr 29, 2021

Dependencies: #20656

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mkoeppe commented Apr 29, 2021

Branch: u/mkoeppe/mixedintegerlinearprogram__new_generator_method__variables_

@mkoeppe mkoeppe modified the milestones: sage-9.4, sage-9.5 Jul 19, 2021
@mkoeppe mkoeppe modified the milestones: sage-9.5, sage-9.6 Dec 14, 2021
@mkoeppe mkoeppe modified the milestones: sage-9.6, sage-9.7 Mar 5, 2022
@mkoeppe mkoeppe modified the milestones: sage-9.7, sage-9.8 Aug 31, 2022
@mkoeppe mkoeppe modified the milestones: sage-9.8, sage-9.9 Jan 7, 2023
@mkoeppe mkoeppe removed this from the sage-10.0 milestone Mar 16, 2023
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