[R] how to get code of a .Internal() function?

[Alban]

Hello,

I'm working with the function optim() from stats
package,
and inside this function is called the function
.Internal(optim(....)) and I want to get the code of
this function which would help me to understand why
the Nelder-Mead algorithm doesn't converge with my
data.
I'm working under Windows XP.
Could you reply to this adress because I don't belong
to the mailing list
Thank you very much!!!