[SCIP] Reduced cost about variables in LP relaxation

[weikaimas at 163.com]

Hi all,

   I have used SCIP to implement a B&P procedure. At leaf nodes, before I implement pricing algorithm I use SCIPgetVarRedcosr()
to check the reduced cost of all variables (SCIPgetLPSolstat() returns 1). I found some variables with negative reduced cost.
  Can you give me the reasons about this phenomenon?  How can I avoid to find the variables with negative reduced cost in my pricing algorithm?

Best regards,

Kai WEI

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