Nothing
`RCov` <- function(X, na.action=na.fail)
{
X <- na.action(X)
d<-dim(X)
matrix(.C("sum_of_rank_outers", as.double(X),as.integer(d), res=double(d[2]^2),PACKAGE="SpatialNP")$res,ncol=d[2],byrow=T)/d[1]
}
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