#16504: Fix the confusion in MILP.new_variable()
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Reporter: jdemeyer | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: linear programming | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: u/ncohen/16504 | Commit:
Dependencies: | Stopgaps:
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Changes (by ncohen):
* status: new => needs_review
* branch: => u/ncohen/16504
Comment:
Hello !
Here is the branch. Took much longer than I thought.
What it does :
- Removes the `is_nonnegative`, `set_nonnegative` functions that were
introduced in #15521 as 'nonnegative' is not meant to be a variable type
but a 'property' of any type. Those functions are renamed to `is_real`
and `set_real`, i.e. their status before #16504
- It was formerly possible to do things like that
{{{
sage: p = MixedIntegerLinearProgram()
sage: v = p.new_variable()
sage: p.set_min(v[0],15)
sage: p.get_min(v[0])
15.0
}}}
but it was NOT possible to do things like that
{{{
sage: p.set_min(v,17)
sage: p.get_min(v[18])
17.0
}}}
i.e. it was possible to define upper/lower bound on a specific variable,
but not to do the same on a dictionary of variables in such a way that the
new variables created fro the dictionary will inherit the bounds. But
that's exactly what we wanted to do here.
Thus I needed to add arguments lower/upper bound to the constructor of
`MIPVariable`, plus set functions where it was needed.
Well... `needs_review` !
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/16504#comment:15>
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