Originally posted by: PingLiu

I have 2 .lp files, where there are some fixed variables.
in test1.lp,'x2' and 'x5'are fixed;
in test2.lp, there are 178 fixed variables(including 'x14','x31',...) .
when I run

cplex.readModel(FileName)

for both of them,
why does the matlab show warnings for test2 but not for test1?

Warning, line 3975: Name 'x14' does not exist.
Warning, line 3992: Name 'x31' does not exist.
...........................................
158 name warnings not printed.

#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

In test1.lp, x2, x5 variables are fixed as you say. However you donot see any warnings associated with them since they are present not just in the 'Bounds' section where you fix them to their values, but also atleast in the model's objective function and/or the constraints ('subject to' block).

On the other hand, in test2.lp, x14 (and others like x31) is only present in the 'Bounds' section, but not in the model's objective function or the constraints. A variable that is not present in the objective function or the constraints is not really part of the model and thus the warning indicating the same appears when you read the model in.

Hope this explains.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: PingLiu

thanks for your reply.
could you also see the similar problem in the following?
Link:http://www.ibm.com/developerworks/forums/thread.jspa?threadID=413193&tstart=0
according to your explanation, I still cannot understand this situation.
#CPLEXOptimizers
#DecisionOptimization