#15521: Deprecations: default LP variables will become real instead of
nonnegative
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Reporter: ncohen | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.1
Component: linear programming | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies: #15482
Stopgaps: |
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Following the discussion on Sage-devel [1], default LP variables will
become "real" instead of nonnegative as it is the case at the moment.
The aim is to have 4 types available through `new_variable()` : binary,
integer, nonnegative, and real. Right now, nonnegative does not exist, and
"real" represents nonnegative variables.
What this ticket does:
- A warning has to be displayed when `new_variable()` is called without
arguments, as the default behaviour will change. Users are advised to add
`nonnegative=True` instead.
- A warning has to be displayed when `new_variable(real=True)` is called,
for it represents nonnegative variables at the moment and will represent
real variables later. Users are advised to switch to `nonnegative=True`
instead.
Nathann
[1] https://groups.google.com/d/msg/sage-devel/3vrPzUqFpM4/hKFp0RjV8poJ
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Ticket URL: <http://trac.sagemath.org/ticket/15521>
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