#20447: Wrong result from delsarte_bound_additive_hamming_space with GLPK exact
simplex
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Reporter: mkoeppe | Owner:
Type: defect | Status: needs_info
Priority: major | Milestone: sage-wishlist
Component: coding theory | Resolution:
Keywords: lp | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #20406 | Stopgaps:
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Changes (by mkoeppe):
* upstream: Not yet reported upstream; Will do shortly. => N/A
* milestone: sage-7.2 => sage-wishlist
Comment:
Actually, storing the rational results as doubles is fine, in fact I have
a test in `glpk_backend` for that.
The error is happening when the big coefficients are converted into
doubles, and then reconstructed by GLPK's exact simplex.
So there's no upstream bug to be reported -- except that we still really
want GLPK to make the interface to glpssx.h public (#18765).
Guarding your code against floating-point fuzz is a wishlist item -- I'm
marking this ticket as such.
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Ticket URL: <http://trac.sagemath.org/ticket/20447#comment:11>
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