window(x, start, end, frequency, deltat)
x
| a time-series or other object. |
start
| the start time of the period of interest. |
end
| the end time of the period of interest. |
frequency
| the new sampling frequency, which should be a sub-multiple of the original frequency. |
deltat
| the new time interval between observations, which should be a multiple of the original frequency. |
window
is a generic function which
extracts the subset of the object x
observed between the times start
and end
.tsp
attribute, or vectors or matrices (which are assumed to have
been observed at times 1
to NROW(x)
).
The start and end times are rounded to the nearest sampling time. This is for S compatibility.
tsp
attribute, and with class that of the
x
unless (as for time series) that class is changed by
subsetting. The ts
ensures the result has class "ts"
.time
, ts
.data(presidents) sixties <- window(presidents, 1960, c(1969,4)) data(sunspots) ## all June values in 20th century window(sunspots, start=c(1901,6), frequency=1)