[Rd] Error in optim(...) non-finite finite-difference value (PR#9328)

[avbell at ucdavis.edu]

Full_Name: Adrian Bell
Version: 2.2.0
OS: Windows XP Prof
Submission from: (NULL) (169.237.62.194)


Mysterious error that I do not know how to get around.

Error in optim(...) 
non-finite finite-difference value 

For me, this has occurred for methods Nelder-Mead and L-BFGS-B.

What does it mean? Is it a bug? I have tried several things including coercing
the function being optimized to be finite.