[R] a nlm question

[Jiang Peng]

  Dear R listers,

     I posted this problem several days ago but it seems nobody  
answered.

     I use nlm to optimize a given function ,but it always generates  
the following warnings
    "
   Error in nlm(foo, theta.start) : non-finite value supplied by 'nlm'
    "
   I don't know why  ,can anybody give me some hints ?? thanks  in  
advance.

   regards .

_______________________

Jiang Peng, Ph.D. Candidate
Department of mathematics &
Antai college of Economics and management
Shanghai Jiao Tong University
Address: Room 127, #3 Building, Xuhui Campus
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