Nothing
getDtfSparse <- function(n,ord) {
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)) D = D0 %*% D
return(D[Seq(1,n-ord-1),,drop=FALSE])
}
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