Originally posted by: YeJunchi

Hello, I invoke cplex by c++ to solve a MIQCP, and set CPX_PARA_DATACHECK as 2. It cause the cplex error 1015: Parameter value too big. I exported the lp file as following:

Minimize
 obj: 0.0001892233 x3 + 0.0001892233 x4 + 0.0001892233 x8 + 0.0001892233 x9
      + 0.02701 x13 - 0.118625 x14 + x19
Subject To
 c1:  0.001 x1 <= 10000000
 c2:  x2 - x3 + x4  = 0
 c3:  0.001 x2 - 68493.1506849315 x5 <= 0
 c4:  0.001 x2 >= 0
 c5:  0.001 x3 <= 68493.1506849315
 c6:  0.001 x3 >= 0
 c7:  0.001 x6 <= 10000000
 c8:  x7 - x8 + x9  = 0
 c9:  0.001 x7 - 68493.1506849315 x10 <= 0
 c10: 0.001 x7 >= 0
 c11: 0.001 x8 <= 68493.1506849315
 c12: 0.001 x8 >= 0
 c13: 0.001 x9 <= 0
 c14: 0.001 x9 >= 0
 c15: x2 + x7 - x11  = 0
 c16: - x2 - x7 - x12  = 0
 c17: x11 - x13  = 0
 c18: x12 + x14  = 0
 c19: x5  = 1
 c20: - x2 + x3  = 0
 c21: x4  = 0
 c22: 0.001 x8 - 68493.1506849315 x10 <= 0
 c23: 0.001 x9 <= 0
 c24: 0.001 x2 - 7937.76866469563 x15  = 0
 c25: 0.001 x7 - 7937.76866469563 x16  = 0
 c26: 0.001 x13 <= 13698.6301369863
 c27: 0.001 x13 >= 0
 c28: 0.001 x14 <= 13698.6301369863
 c29: 0.001 x14 >= 0
 c30: x18 <= 10
 c31: x18 >= 0.2
 c32: x17 <= 7
 c33: x17 >= 4
 c34: x17 <= 9.85
 c35: x17 >= 4
 c36: x18 <= 9.85
 c37: x18 >= 4
 c38: x1 + x2 >= 0
 c39: x1 - x2 >= 0
 c40: x6 + x7 >= 0
 c41: x6 - x7 >= 0
 q1: [ - x15 ^2 + x17 ^2 - 0.957611830464112 x18 ^2 ] >= 0
Bounds
      x2 Free
 0 <= x5 <= 1
      x7 Free
 0 <= x10 <= 1
      x11 Free
      x12 Free
      x15 Free
      x16 Free
 0 <= x17 <= 100
 0 <= x18 <= 100
      x19 = 0
Binaries
 x5  x10 
End

Could you please tell me which parameter in those constraints cause this error?

Thanks!

What version of CPLEX do you use? In older version of CPLEX the parameter value 2 does not exist.

Originally posted by: YeJunchi

My CPLEX version is 12.5. Dose the parameter value 2 exist in this version?

Originally posted by: YeJunchi

And this program has return the error 1015. Could this fact can prove the DATACHECK has worked? 

Thank you very much!

Value 2 for DATACHECK (aka Modeling Assistance) was introduced with version 12.7: https://www.ibm.com/support/knowledgecenter/SSSA5P_12.7.0/ilog.odms.studio.help/CPLEX/ReleaseNotes/topics/releasenotes127/newModelAsst.html

Is there a specific reason why you still use version 12.5, which is now 5 years old? There's been much progress since then!

Originally posted by: YeJunchi

Ok, I understand why the error happens. Thank you very much. Our program chooses 12.5 because of other reasons.