sort.index: Index extraction

In rindex: Indexing for R

Description

Functions to extract from an index 1) the original vecor, 2) the sorted vector, 3) the original positions (order) and 4) logical NAiness.

Usage

  ## S3 method for class 'index'
x[i, ...]
  ## S3 method for class 'index'
sort(x, decreasing = FALSE, na.last = NA, ...)
  order.index(..., na.last = TRUE, decreasing = FALSE)
  ## S3 method for class 'index'
is.na(x)

Arguments

x	an object of class ‘index’
i	subset information
...	one object of class ‘index’ for order.index, otherwise not to be used
decreasing	TRUE to sort decreasing (default FALSE)
na.last	FALSE to sort NAs first (default TRUE)

Details

sort.index	identical to sort of original vector, but much faster
order.index	identical to order of original vector, but much faster
[.index	index[] returns original vector, subsetting works identical to susetting original vector [ (via NextMethod)
[<-.index	currently forbidden
is.na.index	identical to is.na of original vector, but much faster

Value

Function [.index returns the original vector (or part of it), sort.index returns a sorted vector of values, order.index returns a vector of original integer positions and is.na.index returns a logical vector.

Note

There are dummy functions names.index, names<-.index and [<-.index that catch non-supported use of these generics on index objects.
Note that for non-unique indices order.index(...,decreasing=TRUE) handles ties not identical to order(...,decreasing=TRUE).

Author(s)

Jens Oehlschl<e4>gel

See Also

index, sort, order, [

rindex documentation built on Sept. 1, 2018, 1:04 a.m.