[R] samin and vmmin

[Susan Shortreed]

I am writing code in C and would like to call R's functions samin and
vmmin (optimization routines: simulated annealing and BFGS)

I do not understand how to create and pass in the function (as well as the
extra arguments it needs) I am optimizing.
I have read the R Extensions manual but it is still unclear to me.

Could you give me some pointers and/or direct me to some example code
which calls one of the optimizer functions and includes the definition of
the function to be optimized?

Thank you
Susan