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\name{diff}
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\name{diff}
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\alias{diff}
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\alias{diff}
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\alias{diff.default}
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\alias{diff.default}
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\alias{diff.POSIXt}
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\alias{diff.POSIXt}
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\alias{diff.Date}
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\title{Lagged Differences}
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\title{Lagged Differences}
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\description{
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\description{
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  Returns suitably lagged and iterated differences.
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  Returns suitably lagged and iterated differences.
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}
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}
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\usage{
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\usage{
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diff(x, \dots)
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diff(x, \dots)
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\method{diff}{default}(x, lag = 1, differences = 1, \dots)
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\method{diff}{default}(x, lag = 1, differences = 1, \dots)
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\method{diff}{POSIXt}(x, lag = 1, differences = 1, \dots)
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\method{diff}{POSIXt}(x, lag = 1, differences = 1, \dots)
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\method{diff}{Date}(x, lag = 1, differences = 1, \dots)
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}
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}
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\arguments{
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\arguments{
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  \item{x}{a numeric vector or matrix containing the values to be
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  \item{x}{a numeric vector or matrix containing the values to be
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    differenced.}
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    differenced.}
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  \item{lag}{an integer indicating which lag to use.}
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  \item{lag}{an integer indicating which lag to use.}
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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}"} and \code{"\link{POSIXt}"}.
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  classes \code{"\link[stats]{ts}"}, \code{"\link{POSIXt}"} and
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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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  If \code{x} is a vector of length \code{n} and \code{differences=1},
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  If \code{x} is a vector of length \code{n} and \code{differences=1},
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  then the computed result is equal to the successive differences
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  then the computed result is equal to the successive differences