[R] gradient function in OPTIMX

[Kathie]

Dear R users


When I use OPTIM with BFGS, I've got a significant result without an error
message.  However, when I use OPTIMX with BFGS( or spg), I've got the
following an error message.

----------------------------------------------------------------------------------------------------

>  optimx(par=theta0, fn=obj.fy, gr=gr.fy, method="BFGS",
> control=list(maxit=10000))

Error: Gradient function might be wrong - check it! 

----------------------------------------------------------------------------------------------------

I checked and checked my gradient function line by line. I could not find
anything wrong.

Is it a bug or something?  I prefer OPTIMX, so I'd like to know why.

Thanks a lot in advance

Regards,

Kathryn Lord 

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