Difference: ForumOpsRes0005 (1 vs. 5)

Revision 52019-06-07 - TWikiGuest

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META TOPICPARENT name="ForumOpsRes"

Discussion Forum » OpsRes Web »

Data Fitting Problem

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META FORM name="DiscussionTopicForm"
FORM FIELD Title Title Data Fitting Problem
FORM FIELD Forum Forum ForumOpsRes
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Revision 42008-04-01 - MichaelOSullivan

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META TOPICPARENT name="ForumOpsRes"

Discussion Forum » OpsRes Web »

Data Fitting Problem

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 How do we evaluate a function in AMPL, for the objective function?

-- TWikiGuest - 31 Mar 2008

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-- MichaelOSullivan - 01 Apr 2008

 
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Revision 32008-03-31 - TWikiGuest

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Discussion Forum » OpsRes Web »

Data Fitting Problem

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 For some of the model functions you will need to add constraints to make sure that the solutions stay feasible, e.g., $x - b \geq 0$ (or some small value such as $1^{-10}$).

-- MichaelOSullivan - 30 Mar 2008

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How do we evaluate a function in AMPL, for the objective function?

-- TWikiGuest - 31 Mar 2008

 
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META FORM name="DiscussionTopicForm"

Revision 22008-03-30 - MichaelOSullivan

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META TOPICPARENT name="ForumOpsRes"

Discussion Forum » OpsRes Web »

Data Fitting Problem

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 If I use starting values for a, b and c, how will I know that the solution is a global optimum?

-- TWikiGuest - 29 Mar 2008

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You won't without doing a good investigation of the objective function. However, you should try several different starting points too see if you come up with different local minima.

-- MichaelOSullivan - 30 Mar 2008

For some of the model functions you will need to add constraints to make sure that the solutions stay feasible, e.g., $x - b \geq 0$ (or some small value such as $1^{-10}$).

-- MichaelOSullivan - 30 Mar 2008

 
<--/commentPlugin-->

META FORM name="DiscussionTopicForm"
FORM FIELD Title Title Data Fitting Problem
FORM FIELD Forum Forum ForumOpsRes
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Revision 12008-03-29 - TWikiGuest

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META TOPICPARENT name="ForumOpsRes"

Discussion Forum » OpsRes Web »

Data Fitting Problem

If I use starting values for a, b and c, how will I know that the solution is a global optimum?

-- TWikiGuest - 29 Mar 2008

<--/commentPlugin-->

META FORM name="DiscussionTopicForm"
FORM FIELD Title Title Data Fitting Problem
FORM FIELD Forum Forum ForumOpsRes
 
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