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  \item{differences}{an integer indicating the order of the difference.}
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  \item{differences}{an integer indicating the order of the difference.}
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  \item{\dots}{further arguments to be passed to or from methods.}
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  \item{\dots}{further arguments to be passed to or from methods.}
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}
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}
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\details{
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\details{
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  \code{diff} is a generic function with a default method and ones for
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  \code{diff} is a generic function with a default method and ones for
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  classes \code{"\link[stats]{ts}"}, \code{"\link{POSIXt}"} and
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  classes \code{"\link{ts}"}, \code{"\link{POSIXt}"} and
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  \code{"\link{Date}"}.
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  \code{"\link{Date}"}.
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  \code{\link{NA}}'s propagate.
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  \code{\link{NA}}'s propagate.
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}
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}
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\value{
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\value{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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  Wadsworth \& Brooks/Cole.
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}
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}
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\seealso{
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\seealso{
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  \code{\link[stats]{diff.ts}}, \code{\link[stats]{diffinv}}.
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  \code{\link{diff.ts}}, \code{\link{diffinv}}.
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}
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}
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\examples{
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\examples{
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diff(1:10, 2)
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diff(1:10, 2)
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diff(1:10, 2, 2)
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diff(1:10, 2, 2)
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x <- cumsum(cumsum(1:10))
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x <- cumsum(cumsum(1:10))