#12091: bug in add_constraint to MixedIntegerLinearProgram
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Reporter: dimpase | Owner: ncohen
Type: defect | Status: new
Priority: critical | Milestone: sage-5.0
Component: linear programming | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by dimpase):
Replying to [comment:7 ppurka]:
> Replying to [comment:6 dimpase]:
> > How come? The LP inequalities have LP variables. So one of the tokens
will be such a variable...
>
> My understanding is this:
>
> When you start with `5 <= b[0]` your program will see the ''number'' 5
not an object from the class `LinearConstraint` or `LinearFunction`. So,
`LinearConstraint.__le__` won't be called. This is ok when you have the
opposite `b[0] >= 5`.
OK, this just means that the preparser should keep looking further if he
sees a constant...
IMHO it's some kind of basic compiler/interpreter piece of technology.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12091#comment:8>
Sage <http://www.sagemath.org>
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