Coercion from and to zoo and zooreg

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, ...)

## Default S3 method:
as.zoo(x, ...)

as.zooreg(x, frequency = NULL, ...)

## Default S3 method:
as.zooreg(x, frequency = NULL, ...)

Arguments

x an object,
… further arguments passed to zoo when the return object is created.
frequency the number of observations per unit of time.

Details

as.zoo currently has a default method and methods for ts, fts (currently archived on CRAN), irts, mcmc, tis, xts 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, fortify.zoo can transform “zoo” series to “data.frame” including the time index and optionally melting a wide series into a long data frame.

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

Value

as.zoo returns a zoo object.

See Also

zoo, fortify.zoo, zooreg, ts, irts, tis, mcmc, xts.

Examples

library("zoo")

suppressWarnings(RNGversion("3.5.0"))
set.seed(1)

## coercion to zoo:
## default method
as.zoo(rnorm(5))
         1          2          3          4          5 
-0.6264538  0.1836433 -0.8356286  1.5952808  0.3295078 
## method for "ts" objects
as.zoo(ts(rnorm(5), start = 1981, freq = 12))
  Jan 1981   Feb 1981   Mar 1981   Apr 1981   May 1981 
-0.8204684  0.4874291  0.7383247  0.5757814 -0.3053884 
## 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)
                   x.1         x.2
2003-01-04  0.82122120  1.35867955
2003-01-06 -0.01619026 -0.47815006
2003-01-19  0.94383621  0.41794156
2003-01-27 -0.04493361 -1.47075238
2003-02-01  0.78213630 -0.05380504
2003-02-08  0.59390132 -0.10278773
2003-02-11  0.91897737  0.38767161
2003-03-11  0.07456498 -1.37705956
2003-03-25 -1.98935170 -0.41499456
2003-04-10  0.61982575 -0.39428995
 [1]  0.82122120 -0.01619026  0.94383621 -0.04493361  0.78213630  0.59390132
 [7]  0.91897737  0.07456498 -1.98935170  0.61982575  1.35867955 -0.47815006
[13]  0.41794156 -1.47075238 -0.05380504 -0.10278773  0.38767161 -1.37705956
[19] -0.41499456 -0.39428995
                   x.1         x.2
2003-01-04  0.82122120  1.35867955
2003-01-06 -0.01619026 -0.47815006
2003-01-19  0.94383621  0.41794156
2003-01-27 -0.04493361 -1.47075238
2003-02-01  0.78213630 -0.05380504
2003-02-08  0.59390132 -0.10278773
2003-02-11  0.91897737  0.38767161
2003-03-11  0.07456498 -1.37705956
2003-03-25 -1.98935170 -0.41499456
2003-04-10  0.61982575 -0.39428995
$x.1
 2003-01-04  2003-01-06  2003-01-19  2003-01-27  2003-02-01  2003-02-08 
 0.82122120 -0.01619026  0.94383621 -0.04493361  0.78213630  0.59390132 
 2003-02-11  2003-03-11  2003-03-25  2003-04-10 
 0.91897737  0.07456498 -1.98935170  0.61982575 

$x.2
 2003-01-04  2003-01-06  2003-01-19  2003-01-27  2003-02-01  2003-02-08 
 1.35867955 -0.47815006  0.41794156 -1.47075238 -0.05380504 -0.10278773 
 2003-02-11  2003-03-11  2003-03-25  2003-04-10 
 0.38767161 -1.37705956 -0.41499456 -0.39428995