abIndex-class {Matrix}R Documentation

Class "abIndex" of Abstract Index Vectors

Description

The "abIndex" class, short for “Abstract Index Vector”, is used for dealing with large index vectors more efficiently, than using integer (or numeric) vectors of the kind 2:1000000 or c(0:1e5, 1000:1e6).

Objects from the Class

Objects can be created by calls of the form new("abIndex", ...), or more easily by as(x, "abIndex") where x is an integer (valued) vector.

Slots

kind:
Object of class "character" ~~
x:
Object of class "numIndex" ~~
rleD:
Object of class "rleDiff" ~~

Methods

as.numeric
signature(x = "abIndex"): ...
[
signature(x = "abIndex", i = "index", j = "ANY", drop = "ANY"): ...
coerce
signature(from = "numeric", to = "abIndex"): ...
coerce
signature(from = "abIndex", to = "numeric"): ...
coerce
signature(from = "abIndex", to = "integer"): ...
length
signature(x = "abIndex"): ...
Ops
signature(e1 = "numeric", e2 = "abIndex"): These and the following arithmetic and logic operations are not yet implemented; see Ops for a list of these (S4) group methods.
Ops
signature(e1 = "abIndex", e2 = "abIndex"): ...
Ops
signature(e1 = "abIndex", e2 = "numeric"): ...
Summary
signature(x = "abIndex"): ...

Note

This is currently experimental and not yet used for our own code. Please contact us (packageDescription("Matrix")$Maintainer), if you plan to make use of this class.

Partly builds on ideas and code from Jens Oehlschlaegel, as implemented (around 2008, in the GPL'ed part of) package ff.

See Also

rle (base) which is used here. numeric

Examples

showClass("abIndex")
ii <- c(-3:40, 20:70)
str(ai <- as(ii, "abIndex"))# note



[Package Matrix version 0.999375-33 Index]