diff | R Documentation |
Returns suitably lagged and iterated differences.
## S3 method for class 'timeDate'
diff(x, lag = 1, differences = 1, ...)
x |
an object of class |
lag |
an integer indicating which lag to use. |
differences |
an integer indicating the order of the difference. |
... |
arguments passed to other methods. |
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
.
difftimeDate
for the difference of two "timeDate"
objects.
## create character vectors
dts <- c("1989-09-28", "2001-01-15", "2004-08-30", "1990-02-09")
tms <- c( "23:12:55", "10:34:02", "08:30:00", "11:18:23")
## timeDate
GMT <- timeDate(dts, zone = "GMT", FinCenter = "GMT") + 24*3600
GMT
## suitably lagged and iterated differences
diff(GMT)
diff(GMT, lag = 2)
diff(GMT, lag = 1, diff = 2)
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