Extract the first/last parts of an index as if it were a matrix.
Usage
# S3 method for class 'piar_index'
head(x, n = 6L, ...)
# S3 method for class 'piar_index'
tail(x, n = 6L, ...)
Arguments
- x
A price index, as made by, e.g., elementary_index().
- n
See head()/tail(). The default takes the
first/last 6 levels of x.
- ...
Not currently used.
Value
A price index that inherits from the same class as x.
See also
Other index methods:
[.piar_index(),
aggregate.piar_index,
as.data.frame.piar_index(),
as.ts.piar_index(),
chain(),
contrib(),
is.na.piar_index(),
levels.piar_index(),
mean.piar_index,
merge.piar_index(),
split.piar_index(),
stack.piar_index(),
time.piar_index(),
window.piar_index()
Examples
index <- as_index(matrix(1:9, 3))
head(index, 1)
#> Period-over-period price index for 1 levels over 3 time periods
#> time
#> levels 1 2 3
#> 1 1 4 7
tail(index, 1)
#> Period-over-period price index for 1 levels over 3 time periods
#> time
#> levels 1 2 3
#> 3 3 6 9
