[R] Laplace Approximation

[zerfetzen]

Does anyone have any R code that shows how to do a Laplace Approximation?  I
know there are a variety of these numerical approximation algorithms and I'm
pretty open at this point, I'm just curious how it's approximated in R code. 
I have seen some functions in packages, but I think they all call C code,
and am looking for an example in R only.  Thanks.
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