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solver:reliability_of_model_if_changing_rtmaxv [2007/08/08 18:50]
127.0.0.1 external edit
solver:reliability_of_model_if_changing_rtmaxv [2007/10/20 18:18] (current)
Franz Nelissen
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 //Since we consider our model not to be small, and it now works successfully in our Java framework we are happy with the current solution. However we red in the GAMS manual that increasing Rtmaxv leads to reduced reliability (apart from increased solution time). //Since we consider our model not to be small, and it now works successfully in our Java framework we are happy with the current solution. However we red in the GAMS manual that increasing Rtmaxv leads to reduced reliability (apart from increased solution time).
 Our question is therefore: are the results still reliable, if changing Rtmaxv to 5.e+08 ? // Our question is therefore: are the results still reliable, if changing Rtmaxv to 5.e+08 ? //
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 It is useful to remember that the three single most causes for NLP's to fail are: It is useful to remember that the three single most causes for NLP's to fail are:
-  ​bad starting ​point +  ​bad starting ​points 
-  ​poor bounds +  ​poor bounds 
-  ​poor scaling+  ​poor scaling
 (they are a bit related as setting a positive bound will move the default initial value away from zero). (they are a bit related as setting a positive bound will move the default initial value away from zero).
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 A note from [[ADrud@arki.com|Arne Drud]]: ​ There are in my mind two parts to your question: ​ how to do the scaling to avoid the '​infinity'​ message, and how to interpret the message about reliability when you change '​infinity'​. ​ Let me try to answer both: A note from [[ADrud@arki.com|Arne Drud]]: ​ There are in my mind two parts to your question: ​ how to do the scaling to avoid the '​infinity'​ message, and how to interpret the message about reliability when you change '​infinity'​. ​ Let me try to answer both:
IMPRESSUM / LEGAL NOTICEPRIVACY POLICY solver/reliability_of_model_if_changing_rtmaxv.txt · Last modified: 2007/10/20 18:18 by Franz Nelissen