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gams:endogenous_-control_operations_not_allowed

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gams:endogenous_-control_operations_not_allowed [2007/04/30 14:47]
127.0.0.1 external edit
gams:endogenous_-control_operations_not_allowed [2007/11/30 05:52] (current)
Franz Nelissen
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 ====== Endogenous $-control operations not allowed ====== ====== Endogenous $-control operations not allowed ======
-Q: //I am trying to model a condition like: ''​(x = 2$(y gt 1.5) + 0$(y le 1.5))'',​ but there is an error message+//I am trying to model a condition like: ''​(x = 2$(y gt 1.5) + 0$(y le 1.5))'',​ but there is an error message//
 <​code>​ <​code>​
  ​Endogenous $-control operations not allowed  ​Endogenous $-control operations not allowed
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 data only. data only.
  
-When users try to do this with a NLP, it often means that they have a discrete aspect to +When you try to do this with a NLP, it often means that you have a discrete aspect to 
 their model that will require the introduction of binary variables -- making the  their model that will require the introduction of binary variables -- making the 
 model type an MINLP (mixed integer nonlinear program) that needs to be solved ​ model type an MINLP (mixed integer nonlinear program) that needs to be solved ​
 with a solver like DICOPT or SBB. If you browse our model library, you'll find examples of  with a solver like DICOPT or SBB. If you browse our model library, you'll find examples of 
 MINLP models that might help. MINLP models that might help.
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