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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