zoo (version 1.5-5)

as.zoo: Coercion from and to zoo

Description

Methods for coercing "zoo" objects to other classes and a generic function as.zoo for coercing objects to class "zoo".

Usage

as.zoo(x, ...)

Arguments

x

an object,

...

further arguments passed to zoo when the return object is created.

Value

• as.zoo returns a zoo object.

Details

as.zoo currently has a default method and methods for ts, its and irts objects (and zoo objects themselves).

Methods for coercing objects of class "zoo" to other classes currently include: as.ts, as.matrix, as.vector, as.data.frame, as.list (the latter also being available for "ts" objects). Furthermore the coercion function as.its.zoo is provided, but works only if the corresponding package is attached.

In the conversion between zoo and ts, the zooreg class is always used.

See Also

zoo, zooreg, ts, its, irts

Examples

## coercion to zoo:
## default method
as.zoo(rnorm(5))
## method for "ts" objects
as.zoo(ts(rnorm(5), start = 1981, freq = 12))

## coercion from zoo:
x.date <- as.POSIXct(paste("2003-", rep(1:4, 4:1), "-", sample(1:28, 10, replace = TRUE), sep = ""))
x <- zoo(matrix(rnorm(24), ncol = 2), x.date)
as.matrix(x)
as.vector(x)
as.data.frame(x)
as.list(x)