[Cbc] Semi-continuous/SOS/.LP format

[James Howey]

Thanks for your attention to this. One question:

1.	When you say "in trunk" where do I go to pick up the fix?

Looking forward to a test drive.

Thanks,

jkh

-----Original Message-----
From: Cbc [mailto:cbc-bounces at coin-or.org] On Behalf Of John Forrest
Sent: Sunday, January 21, 2018 7:37 AM
To: cbc at list.coin-or.org
Subject: [Cbc] Semi-continuous/SOS/.LP format

1) Reading .lp format (by the way this is Cplex .lp format) has been
improved.  The code throws an error in same cases - this is now trapped and
the error message printed.
2) .lp format allowed Set1 S1:: (with a space) - this failed with Cbc.
3) Semi-continuous hopefully better.
4) SOS - in the failing example given, the continuous relaxation was
(correctly) unbounded - Cbc does not like this.  My simple fix is to
automatically reduce bounds to -1.0e15/+1.0e15 - if your objective is
dollars then this is still serious money.
5) Some bugs in preprocessing with semi-continuous/SOS.

All in trunk - I hope it helps.

John Forrest
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