R help - Jun 2007 - besselK- complex number problem any help is welcome

Assistance,
 Im a student  intrested in using R in my learning and research work in option
pricing however i have a problem with besselK function In R.
 Would you assit me in computing the besselK of third kind of a complex number
in R.
 Any code or suggestion will be highly appriceiated
 eg
 besselK(2,10)  works well.. but
 besselK(2,10i) doesnt work !!
 
 im supprised it works in MATLAB but NOT in R.
 rgds
 ivivi mwaniki
 student
school of mathematics   
 nairobi university
 kenya 
       
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