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MathGroup Archive 2008

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NMaximize Questions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90940] NMaximize Questions
  • From: "Stuart Nettleton" <stuart.nettleton at optusnet.com.au>
  • Date: Thu, 31 Jul 2008 02:55:22 -0400 (EDT)

Hi, I was wondering if someone might be able to help me with some  
NMaximize issues? Thanks, Stuart
1. Is there any limit to the number of variables in NMaximise. Is it  
possible/sensible to run a model with about 1,300 variables?
2. What is the meaning of the following error?
Error is:
NMaximize::nnum: "The function value 0 is not a number at \
{c[1],c[2],c[3],cem[1],cem[2],cem[3],cpc[1],cpc[2],cpc[3],e[1],<<53>>}\
  = {0.,2.57857*10^-17,-4.69557*10^-17,0.,<<24>>,<<23>>,<<23>>,3.6165*\
10^-21,-6.20768*10^-21,4.81393*10^-13,<<53>>}. "

The error using FindMaximum is:
FindMaximum::nrgnum: "The gradient is not a vector of real numbers at \
{c[1],c[2],c[3],cem[1],cem[2],cem[3],cpc[1],cpc[2],cpc[3],e[1],<<46>>}\
  = {1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,<<46>>}."

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