<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"><style>body { line-height: 1.5; }body { font-size: 10.5pt; font-family: 'Microsoft YaHei UI'; color: rgb(0, 0, 0); line-height: 1.5; }</style></head><body>Hi all,<div><br></div><div> I have used SCIP to implement a B&P procedure. At leaf nodes, before I implement pricing algorithm I use SCIPgetVarRedcosr()</div><div>to check the reduced cost of all variables (<span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">SCIPgetLPSolstat() returns 1</span><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">). I found some variables with negative reduced cost.</span></div><div><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;"> Can you give me the reasons about </span><span style="font-size: 10.5pt; line-height: 1.5; background-color: window;">this phenomenon? How can I avoid to find the variables with negative reduced cost in my pricing algorithm?</span></div><div><br></div><div><span style="font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;">Best regards,</span></div><div><span style="font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;"><br></span></div><div><span style="font-family: 'Microsoft YaHei UI', Tahoma; line-height: normal;">Kai WEI</span></div><div><br></div></body></html>