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#' tcub
#' to be documented
#' @usage tcub(d,h)
#' @param d a vector of distances
#' @param h a scalar or vector of bandiwdths (lenght(h)=1 or length(h)=length(d))
#' @return a vector of weights.
#' @noRd
tcub <- function(d,h) { #bisquare kernel
x<-abs(d/h)
x[x< 1]<- (70/81)*((1-x[x< 1]^3)^3)
x[x>= 1]<- 0
x
}
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