#20447: Wrong result from delsarte_bound_additive_hamming_space with GLPK exact
simplex
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Reporter: mkoeppe | Owner:
Type: defect | Status:
Priority: major | needs_info
Component: coding theory | Milestone: sage-7.2
Keywords: lp | Resolution:
Authors: | Merged in:
Report Upstream: Not yet reported upstream; | Reviewers:
Will do shortly. | Work issues:
Branch: | Commit:
Dependencies: #20406 | Stopgaps:
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Comment (by mkoeppe):
How come you never run into trouble with the floating-point based solvers
with this kind of code?
It is certainly ironic that the exact solver has more floating-point fuzz
than the floating-point solvers. But your code cannot be correct if solver
is a floating-point solver.
And there is an apparent upstream issue with GLPK. I wouldn't call it a
bug, but given the design decision to return the exact values as double-
floats, it should at least be improved to return all integers that have an
exact representation in double-float as such.
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Ticket URL: <http://trac.sagemath.org/ticket/20447#comment:5>
Sage <http://www.sagemath.org>
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