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.