In R 2.15.2 (and not before), in the definition of function 'diffinv.vector' in
package stats, there is
difference <- as.integer(differences)
I believe
differences <- as.integer(differences)
is intended, because 'difference' is not referenced anywhere. However, without
conversion of 'differences' to integer, 'diffinv.vector' in R 2.15.2 works OK.
Also, to make 'differences' consistently integer,
diffinv.vector(diffinv.vector(x, lag, differences-1,
diff(xi, lag=lag, differences=1)),
lag, 1, xi[1L:lag])
in the end part can be changed to
diffinv.vector(diffinv.vector(x, lag, differences-1L,
diff(xi, lag=lag, differences=1L)),
lag, 1L, xi[1L:lag])
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