# zoo

From zoo v0.1-2
by Achim Zeileis

##### Z's Ordered Observations

`zoo`

is the creator for an S3 class of indexed
totally ordered observations which includes irregular
time series.

- Keywords
- ts

##### Usage

`zoo(x, order.by)`

##### Arguments

- x
- a vector or matrix.
- order.by
- a vector by which the observations in
`x`

are ordered.

##### Details

`zoo`

is still under development, but it provides `plot`

and `index`

(or `time`

) methods for `"zoo"`

objects
and can convert `"ts"`

and `"irts"`

objects with
`as.zoo`

.

The vector of indexes `order.by`

can be of arbitrary class,
but it is essential that `order(order.by)`

works. For other
functions it is assumed that `c()`

, `length()`

and subsetting
`[,`

work.

##### Value

- A vector or matrix with an
`"index"`

attribute of the same dimension (`NROW(x)`

) by which`x`

is ordered.

##### See Also

##### Examples

```
x.date <- as.POSIXct(paste("2003-02-", c(1, 3, 7, 9, 14), sep = ""))
x <- zoo(rnorm(5), x.date)
plot(x)
time(x)
x[1:3]
```

*Documentation reproduced from package zoo, version 0.1-2, License: GPL*

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