## File: base-diff.Rd

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r-cran-timedate 3012.100-2
 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475 \name{diff} \title{Lagged 'timeDate' Differences} \alias{diff} \alias{diff.timeDate} \description{ Returns suitably lagged and iterated differences. } \usage{ \method{diff}{timeDate}(x, lag = 1, differences = 1, \dots) } \arguments{ \item{x}{ an object of class \code{timeDate}. } \item{lag}{ an integer indicating which lag to use. } \item{differences}{ an integer indicating the order of the difference. } \item{\dots}{ arguments passed to other methods. } } \value{ For the function, \code{diff.timeDate}, if \code{x} is a vector of length \code{n} and \code{differences=1}, then the computed result is equal to the successive differences \code{x[(1+lag):n] - x[1:(n-lag)]}. If \code{difference} is larger than one this algorithm is applied recursively to \code{x}. Note that the returned value is a vector which is shorter than \code{x}. } \examples{ ## Create Character Vectors: dts = c("1989-09-28", "2001-01-15", "2004-08-30", "1990-02-09") dts tms = c( "23:12:55", "10:34:02", "08:30:00", "11:18:23") tms ## timeDate - GMT = timeDate(dts, zone = "GMT", FinCenter = "GMT") + 24*3600 GMT ZUR = timeDate(dts, zone = "GMT", FinCenter = "Europe/Zurich") ZUR ## diff - # Suitably Lagged and Iterated Differences: diff(GMT) diff(GMT, lag = 2) diff(GMT, lag = 1, diff = 2) } \keyword{chron}