What could be the reason for this kind of message?

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Jubeyer
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What could be the reason for this kind of message?

Post by Jubeyer » 2 months ago

Hi ,

I am getting this kind of message in my log file,

MIP status(101): integer optimal solution
Cplex Time: 148.14sec (det. 115562.34 ticks)
Fixing integer variables, and solving final LP...
Version identifier: 12.10.0.0 | 2019-11-26 | 843d4de
CPXPARAM_Advance 2
CPXPARAM_Threads 1
CPXPARAM_Parallel 1
CPXPARAM_MIP_Display 4
CPXPARAM_MIP_Tolerances_AbsMIPGap 0
CPXPARAM_MIP_Tolerances_MIPGap 0
CPXPARAM_WorkDir "/home/jxr180022/NEw_Gams/225b/"
Infeasible column 'STARTUP_COST('CC NG 28'.19)'.
Presolve time = 0.13 sec. (76.38 ticks)
Fixed MIP status(3): infeasible
Cplex Time: 0.13sec (det. 76.38 ticks)
Rerunning with presolve turned off and solving with LPMETHOD=1
Version identifier: 12.10.0.0 | 2019-11-26 | 843d4de
CPXPARAM_Advance 2
CPXPARAM_Preprocessing_Presolve 0
CPXPARAM_LPMethod 1
CPXPARAM_Threads 1
CPXPARAM_Parallel 1
CPXPARAM_MIP_Display 4
CPXPARAM_MIP_Tolerances_AbsMIPGap 0
CPXPARAM_MIP_Tolerances_MIPGap 0
CPXPARAM_WorkDir "/home/jxr180022/NEw_Gams/225b/"
Using devex.

Iteration log . . .
Iteration: 1 Objective = -235367623.377326
Iteration: 663 Objective = -235367461.243950
Removing shift (7).
Switched to devex.
Iteration: 2586 Infeasibility = 0.000155
Switched to devex.
Fixed MIP status(5): optimal with unscaled infeasibilities
Cplex Time: 1.18sec (det. 868.88 ticks)
Final solve did not return an optimal solution.
Consider setting option 'relaxfixedinfeas' to 1.
Returning a primal only solution to GAMS (marginals all set to NA).

Proven optimal solution.

As per my search this marginals of having 'NA' value is a result of poor scaling. So I have used the cplex options to numericalemphasis=1
scaind=1

But still I am getting this. Can anyone suggest what I should do in this case? or Where to look at? What does infeasible column basically mean and what could be the causes for them?

Regards,
Jubeyer

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