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...ckage does not work, even for f(x)=sqrt(x), if you do "genD(f,x=0)", warning message comes out. I need the one sided derivatives. Thanks if you could provide some help. -- View this message in context: http://www.nabble.com/Any-numeric-differentiation-routine-in-R-for-boundary-points--tp15110811p15110811.html Sent from the R help mailing list archive at Nabble.com.