window {stats}  R Documentation 
window
is a generic function which
extracts the subset of the object x
observed between the times start
and end
. If a
frequency is specified, the series is then resampled at the new
frequency.
window(x, ...)
## S3 method for class 'ts'
window(x, ...)
## Default S3 method:
window(x, start = NULL, end = NULL,
frequency = NULL, deltat = NULL, extend = FALSE, ts.eps = getOption("ts.eps"), ...)
window(x, ...) < value
## S3 replacement method for class 'ts'
window(x, start, end, frequency, deltat, ...) < value
x 
a timeseries (or other object if not replacing values). 
start 
the start time of the period of interest. 
end 
the end time of the period of interest. 
frequency, deltat 
the new frequency can be specified by either (or both if they are consistent). 
extend 
logical. If true, the 
ts.eps 
time series comparison tolerance. Frequencies are
considered equal if their absolute difference is less than

... 
further arguments passed to or from other methods. 
value 
replacement values. 
The start and end times can be specified as for ts
. If
there is no observation at the new start
or end
,
the immediately following (start
) or preceding (end
)
observation time is used.
The replacement function has a method for ts
objects, and
is allowed to extend the series (with a warning). There is no default
method.
The value depends on the method. window.default
will return a
vector or matrix with an appropriate tsp
attribute.
window.ts
differs from window.default
only in
ensuring the result is a ts
object.
If extend = TRUE
the series will be padded with NA
s if
needed.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
window(presidents, 1960, c(1969,4)) # values in the 1960's
window(presidents, deltat = 1) # All Qtr1s
window(presidents, start = c(1945,3), deltat = 1) # All Qtr3s
window(presidents, 1944, c(1979,2), extend = TRUE)
pres < window(presidents, 1945, c(1949,4)) # values in the 1940's
window(pres, 1945.25, 1945.50) < c(60, 70)
window(pres, 1944, 1944.75) < 0 # will generate a warning
window(pres, c(1945,4), c(1949,4), frequency = 1) < 85:89
pres