`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 re-sampled at the new
frequency.

```
window(x, …)
# S3 method for ts
window(x, …)
# S3 method for default
window(x, start = NULL, end = NULL,
frequency = NULL, deltat = NULL, extend = FALSE, …)
```window(x, …) <- value
# S3 method for ts
window(x, start, end, frequency, deltat, …) <- value

x

a time-series (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 `start`

and `end`

values
are allowed to extend the series. If false, attempts to extend the
series give a warning and are ignored.

…

further arguments passed to or from other methods.

value

replacement values.

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.

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.

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

# NOT RUN { 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 # }

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