#16504: A mandatory 'nonnegative' argument for
MixedIntegerLinearProgram.new_variable() until the standard changes
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.3
Component: linear | Resolution:
programming | Merged in:
Keywords: | Reviewers: Jeroen Demeyer
Authors: Nathann Cohen | Work issues: nonnegative=False
Report Upstream: N/A | doctests, avoid isinstance()
Branch: u/ncohen/16504 | Commit:
Dependencies: | b1f43af754d4ab7e136015519c7fc0cdbe32dd36
| Stopgaps:
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Comment (by ncohen):
> Am I correct that this is a safe change in the sense that the existing
code using `nonnegative=True` as default would either continue to work, or
will refuse to work? I.e. people won't possibly start getting wrong
answers?
It will work, and there should be no wrong answer (unless there is a bug
somewhere). The default behaviour is now "nonnegative + warning", and the
correct way to use this class is to specify a value for nonnegative.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/16504#comment:31>
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