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4 replies Latest Post - ‏2008-10-28T03:25:22Z by SystemAdmin
SystemAdmin
SystemAdmin
151 Posts
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Pinned topic Inconsistent solution from ODM and OPL

‏2008-10-28T02:14:18Z |

[Boon said:]

Hello,

I am using OPL 6.1 and ODM 3.1.

I build a model in OPL( 1 model file and 1 data file). I generate ODM application from the OPL. I run the ODM and solve the problem. The solutions from running in OPL and running in ODM are different. I did not change any configuration at all. Basically, I have 1 .mod and 1 .dat file, put them in a new project in OPL, then generate the ODM. Did I miss any step in generating the ODM?

Thank you,
Boon
Updated on 2008-10-28T03:25:22Z at 2008-10-28T03:25:22Z by SystemAdmin
  • SystemAdmin
    SystemAdmin
    151 Posts
    ACCEPTED ANSWER

    Re: Inconsistent solution from ODM and OPL

    ‏2008-10-28T02:46:28Z  in response to SystemAdmin

    [thiago.serra said:]

    Are you using any dexpr in your objective function?
    If yes, read the topic I did about it.
    • SystemAdmin
      SystemAdmin
      151 Posts
      ACCEPTED ANSWER

      Re: Inconsistent solution from ODM and OPL

      ‏2008-10-28T03:01:15Z  in response to SystemAdmin

      [Boon said:]

      Thanks for your answer.

      You are right, I did use dexpr!

      I went ahead and read your topic already. Surprised!!

      So...  We cannot use any coefficient (other than 1, 0) in the objective function if we want to use ODM.

      Thanks,
      • SystemAdmin
        SystemAdmin
        151 Posts
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        Re: Inconsistent solution from ODM and OPL

        ‏2008-10-28T03:05:06Z  in response to SystemAdmin

        [thiago.serra said:]

        NO, it's not that.

        You can't use parenthesis and all dexpr's should be multiplied only by number (no variables allowed).
        • SystemAdmin
          SystemAdmin
          151 Posts
          ACCEPTED ANSWER

          Re: Inconsistent solution from ODM and OPL

          ‏2008-10-28T03:25:22Z  in response to SystemAdmin

          [Boon said:]

          Thank you for correction and clearification.

          Best,