start {stats} | R Documentation |
Extract and encode the times the first and last observations were taken. Provided only for compatibility with S version 2.
start(x, ...)
end(x, ...)
x |
a univariate or multivariate time-series, or a vector or matrix. |
... |
extra arguments for future methods. |
These are generic functions, which will use the
tsp
attribute of x
if it exists.
Their default methods decode the start time from the original time
units, so that for a monthly series 1995.5
is represented
as c(1995, 7)
. For a series of frequency f
, time
n+i/f
is presented as c(n, i+1)
(even for i = 0
and f = 1
).
The representation used by start
and end
has no
meaning unless the frequency is supplied.