R: Extract/Replacing the Time Windows of Objects

window.zoo {zoo}

R Documentation

Extract/Replacing the Time Windows of Objects

Description

Methods for extracting time windows of "zoo" objects and replacing it.

Usage

## S3 method for class 'zoo':
window(x, index = index.zoo(x), start = NULL, end = NULL, ...)
## S3 method for class 'zoo':
window(x, index = index.zoo(x), start = NULL, end = NULL, ...) <- value

Arguments

`x`	an object.
`index`	the index/time window which should be extracted.
`start`	an index/time value. Only the indexes in `index` which are greater or equal to `start` are used.
`end`	an index/time value. Only the indexes in `index` which are lower or equal to `end` are used.
`value`	a suitable value object for use with `window(x)`.
`...`	currently not used.

Value

Either the time window of the object is extracted (and hence return a "zoo" object) or it is replaced.

Examples

## zoo example
x.date <- as.Date(paste(2003, rep(1:4, 4:1), seq(1,19,2), sep = "-"))
x <- zoo(matrix(rnorm(20), ncol = 2), x.date)
x

window(x, start = as.Date("2003-02-01"), end = as.Date("2003-03-01"))
window(x, index = x.date[1:6], start = as.Date("2003-02-01"))
window(x, index = x.date[c(4, 8, 10)])
window(x, index = x.date[c(4, 8, 10)]) <- matrix(1:6, ncol = 2)
x

## zooreg example (with plain numeric index)
z <- zooreg(rnorm(10), start = 2000, freq = 4)
window(z, start = 2001.75)
window(z, start = c(2001, 4))