diff.mondate: 'diff' for package mondate
In mondate: Keep Track of Dates in Terms of Months

Description Usage Arguments Details Value Author(s) See Also Examples

Returns suitably lagged and iterated differences of an object of class mondate.

1 2	## S3 method for class 'mondate' diff(x, lag = 1L, differences = 1L, ...)

`x`	a mondate vector or matrix containing the values to be differenced.
`lag`	an integer indicating which lag to use.
`differences`	an integer indicating the order of the difference.
`...`	further arguments to be passed to or from methods.

See the diff function in base.

If x is a vector of length n and differences=1, then the computed result is equal to the successive differences x[(1+lag):n] - x[1:(n-lag)].

If difference is larger than one this algorithm is applied recursively to x. Note that the returned value is a vector which is shorter than x.

If x is a matrix then the difference operations are carried out on each column separately.

Dan Murphy

diff

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evalDate<-mondate(c(12+12*1:10))  # year ends 2001, ..., 2010
diff(evalDate)                    # vector of length 9 holding the number 12, 
                                  # with "timeunits" attribute = "months"

Attaching package: 'mondate'

The following object is masked from 'package:base':

    as.difftime

[1] 12 12 12 12 12 12 12 12 12
attr(,"timeunits")
[1] "months"