RS01145: A DEXPR ARRAY INITIALIZED AS PRODUCT OF A PARAMETER AND PWL FUNCTION CAUSES INCORRECT EVALUATION OF DEXPR IN POST-PROCESSING

APAR status

• Closed as fixed if next.

Error description

• Consider example below that gives incorrect value for "f_[m]" in
  post-processing script. Value of 'hf[m]' as well as obj is
  correct.
  
  range markSel = 0..15;
  float a[m in markSel] = ...;
  
  dvar float+ t_[markSel] in 0.01 .. 0.30;
  dexpr float f_[m in markSel] =
  a[m] * piecewise {
  -1000000 -> 0.01;
  -306.51 -> 0.3;
  1
  } (0.1,100) t_[m];
  dexpr float obj = sum(m in markSel) f_[m];
  
  minimize obj;
  constraints {}
  
  float hf[m in markSel] = f_[m];
  
  execute {
    var m;
    for (m in markSel) {
      writeln("mark "+f_[m]+" "+hf[m]);
    }
    writeln("objective "+cplex.getObjValue());
  }
  

Local fix

• Declare dexpr and obj as below:
  
  dexpr float f_[m in markSel] =
   piecewise {
     -1000000 -> 0.01;
     -306.51 -> 0.3;
     1
    } (0.1,100) t_[m];
  dexpr float obj = sum(m in markSel) a[m]*f_[m];
  

Problem summary

• This issue has been resolved and fix will be available with
  CPLEX Optimization Studio 12.5.0.1
  

Problem conclusion

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels

• RC40 PSN

     UP