Star (*) sign in optimization result

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WayneZhou2009
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Star (*) sign in optimization result

Post by WayneZhou2009 »

Hi Tom,

Sometimes the optimization result comes with a star (*) ahead of a parameter being optimized. Something like the following:

Maximum payoff found at:
*Inventory of products = 5e+007

What does the star (*) mean? I remember there are some old posts in which people asked the same question, however I have tried to search those posts but failed to locate them. Vensim Help seems to not explain it, despite that the examples of optimization show star signs, too. (Maybe there is some explanation but I could not find it).

Many thanks for your time.
tomfid
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Re: Star (*) sign in optimization result

Post by tomfid »

I think it just indicates that the value changed on the last pass through the parameters.
WayneZhou2009
Senior Member
Posts: 105
Joined: Wed Oct 25, 2017 3:52 pm
Vensim version: PRO

Re: Star (*) sign in optimization result

Post by WayneZhou2009 »

Hi Tom, thanks, however I cannot understand what you meant by "value changed on the last pass through the parameters". Please could you elaborate a bit further? Many thanks.
tomfid
Administrator
Posts: 3804
Joined: Wed May 24, 2006 4:54 am

Re: Star (*) sign in optimization result

Post by tomfid »

The optimizer makes multiple passes through the vector of parameters (or later, of general search directions). I think the * indicates improvement was found.
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