If you are looking to price standard barrier options under BS assumptions (no stoch/local vol) the analytic approximations in RQuantlib or fOptions (which is from Haug's book) is your best friend.

Now if you must price using MC have a look at this little paper it is simple. (and inaccurate/ big standard error)

http://www.opalconsulting.ch/dataa/245de.pdf

As there is a big discretization error which needs to be addressed by Importance sampling or better still brownian bridge as in Amir Atiya

http://alumnus.caltech.edu/~amir/barrier.pdf


Cheers
Krishna 


On Jun 10, 2013, at 4:37 AM, Raghuraman Ramachandran <optionsraghu@gmail.com> wrote:

> Dear guRus
> 
> Is there any package to price up barrier options using Monte Carlo
> simulations in R please?
> 
> Thx
> Raghu
> 
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