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[Bug-glpk] Re: Only MPS writer warns about empty columns and other write
[Bug-glpk] Re: Only MPS writer warns about empty columns and other writers don't
Wed, 03 Nov 2010 22:59:58 +0300
> This is a minor inconsistency.
> I tried to write out my problem to various formats. And only MPS writer
> printed this:
> Warning: problem has 27 empty column(s)
> Other writers: MIP,SOL,LPX didn't complain even though this is the same
> Different writers should produce the same warning on the same problem.
No, they shouldn't. The reason is that the mps format, unlike other
formats, is column-oriented, so an empty column cannot be written in an
mps file without introducing a dummy zero coefficient in some row.
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Andrew Makhorin <=