[R] Boundary kernel for kernel density plot?

[Ravi Kulkarni]

Hello,
  Is a kernel called the "boundary" kernel available for kernel density
plots? 
In the help, I can only see the following kernels: "gaussian",
"rectangular", "triangular", "epanechnikov", "biweight", "cosine" or
"optcosine".

The boundary kernel apparently improves the estimate in a neighborhood of
zero. 

Thanks,

  Ravi Kulkarni
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