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] 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 | ||

Line 10: | Line 10: | ||

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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gams/endogenous_-control_operations_not_allowed.txt ยท Last modified: 2007/11/30 05:52 by Franz Nelissen