Nothing
getDtfPosSparse <- function(n,ord,pos) {
D = bandSparse(n, m=n, c(0,1), diagonals=list(rep(-1,n),rep(1,n-1)))
D0 = D
for (i in Seq(1,ord)) {
wts = c(i/(pos[(i+1):n]-pos[1:(n-i)]),rep(1,i))
D = D0 %*% (wts * D)
}
return(D[1:(n-ord-1),,drop=FALSE])
}
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