Re: Problem with NMaximize
- To: mathgroup at smc.vnet.net
- Subject: [mg68852] Re: Problem with NMaximize
- From: Peter Pein <petsie at dordos.net>
- Date: Mon, 21 Aug 2006 03:28:03 -0400 (EDT)
- References: <ec97qm$4dt$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Lee Newman schrieb: > Dear Group, > > I have function that I want to maximize. The function calls many other > functions, and I have verified that on its own, it works as intended. > However, when I include the function in an NMaximize statement, I get > errors. After including Print statements within the function (and the > functions that calls), it seems the problem is that the variable being > passed to the function by NMaximize is being treated as a undefined > symbol, rather than as the value currently being passed by NMaximize. > > NMaximize[ {bigFunc[a,b,c]}, {{a,0,1},{b,0,2},{c,0,3}}, > Method->"NelderMead"]; > > bigfunc[x_,y_,z_] := Module[{vars here}, large function here; Print[y]]; > > When called directly bigfunc[1,2,3], the print statement prints 2, the > correct value for argument y. > When called within NMaximize (as above), the print statement returns b, > the symbolic value passed by NMaximize, and all the errors generated are > related to the fact that b is being treated as a undefined symbol rather > than a numeric value. > > What am I doing wrong? > > - Lee > > ____________________________________________________ > L E E N E W M A N www.leenewman.org > d o c t o r a l s t u d e n t > c o g n i t i v e p s y c h o l o g y > c o m p u t e r s c i e n c e > u . m i c h i g a n > a n n a r b o r > ____________________________________________________ > > Skylarks singing- > the farmer > makes a pillow of his hoe. > > ISSA > Hi Lee, what happens if you define Nbig[params__?NumericQ]:=bigfun[params] and use Nbig instead of bigfun in the call to NMaximize? It _should_ work. Peter