# Subsetting `"sts"`

Objects

`stsXtrct.Rd`

The `[`

-method extracts parts of an
`"sts"`

object
using row (time) and column (unit) indices.

## Arguments

- x
an object of class

`"sts"`

.- i
row index (integer or logical vector).

- j
column index (character, integer, or logical vector).

- ...,drop
unused (arguments of the generic).

Dimensions are never dropped.

## Details

Row indices are used to select a subset of the original time period.
The `start`

and `epoch`

slots of the time series are
adjusted accordingly.
A warning is issued if an irregular integer sequence is used to
extract rows, e.g., `x[c(1,2,4),]`

, which could destroy the
structure of the time series (`freq`

).

Column indices work as usual when indexing matrices,
so may select units by name, position or a vector of booleans.
When subsetting columns, population fractions are recomputed if and
only if `x`

is no `multinomialTS`

and already contains
population fractions.

`NA`

indices are not supported, negative indices are.

Note that a `[<-`

method (i.e., subassignment) is not implemented.