Hi,

	I would greatly appreciate learning of a good paper or manual for "optim."

	More specifically: Often I  get error messages and suggestions - as below "lbfgs" - that are beyond my knowledge and insufficient advice to address the issue.  I have also received "Lapack" messages of the same type. 

Thanks,

Paul
	


Warning message:
In `+.dlm`(mod1, mod2) : the value of mod1$V has been discarded
> fit		<- dlmMLE(y, x, expfunc, control = list(trace = 3, REPORT = 2))
N = 19, M = 5 machine precision = 2.22045e-16
This problem is unconstrained.
At X0, 0 variables are exactly at the bounds
At iterate     0  f=   1.8212e+07  |proj g|=   1.2433e+07
At iterate     2  f =   2.3753e+06  |proj g|=    2.8063e+06
At iterate     4  f =   2.9465e+05  |proj g|=    4.7382e+05
At iterate     6  f =        93564  |proj g|=    1.1105e+05
At iterate     8  f =        51371  |proj g|=         26356

At iterate    64  f =        26612  |proj g|=        29.567
ys=-1.949e+01  -gs= 9.047e+00, BFGS update SKIPPED
At iterate    66  f =        26610  |proj g|=        124.86
At iterate    68  f =        26606  |proj g|=        82.252
Bad direction in the line search;
  refresh the lbfgs memory and restart the iteration.
Error in optim(parm, logLik, method = method, ...) : 
 non-finite finite-difference value [3]
In addition: There were 50 or more warnings (use warnings() to see the first 50)
> 	


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