[Coin-discuss] Fixing SOS variables in Cbc

[John J Forrest]

John,

I will fix.  I will send a note when in cvs.

John Forrest



"John Tomlin" <tomlin at yahoo-inc.com> 
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02/09/2006 12:14 PM
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[Coin-discuss] Fixing SOS variables in Cbc






There is an irritating, but avoidable problem with fixing variables in SOS 
of type 2. 
I?ve been finding it useful to fix the variables in SOS which are 
satisfied at the continuous optimum - in the S1 case by setting the lower 
bound on the non-zero variable to 1.0 and/or the upper bounds on the zero 
variables to zero. It turns out that if you set the lower bound on a S2 
set variable to 1.0  Cbc throws an exception. However, if you just set 
upper bounds to zero it works OK.
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