I am having the same problem as one Rebecca Sela(see bellow).


On 21/12/2007 12:07 AM, Rebecca Sela wrote:
>* I am trying to optimize a likelihood function using NLMINB.  After running without a problem for quite a few iterations (enough that my intermediate output extends further than I can scroll back), it tries a vector of parameter values NaN.  This has happened with multiple Monte Carlo datasets, and a few different (but very similar) likelihood functions.  (They are complicated, but I can send them to someone if desired.)*

Instead I try to use optim() for my optimization needs but it fails
when finding the 0/0:

"

Error in optim(c(phi[, k]), maxphi, lower = 0.01, upper = 0.99, method
= "L-BFGS-B") :
  L-BFGS-B needs finite values of 'fn'
In addition: There were 50 or more warnings (use warnings() to see the first 50)

"


Any suggestions?

Harlan Campbell

McGIll University

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