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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).
Note that the current implementation details are subject to change,
and if you consider working with these classes, please contact the
package maintainers (packageDescription("Matrix")$Maintainer).
Objects can be created by calls of the form new("abIndex", ...),
but more easily and typically either by as(x, "abIndex") where
x is an integer (valued) vector, or directly by
abIseq() and combination c(...) of such.
kind:a character string,
one of ("int32", "double", "rleDiff"), denoting the
internal structure of the abIndex object.
x:Object of class "numLike"; is
used (i.e., not of length 0) only iff the object is not
compressed, i.e., currently exactly when kind != "rleDiff".
rleD:object of class "rleDiff",
used for compression via rle.
signature(x = "abIndex"): ...
signature(x = "abIndex", i = "index", j = "ANY", drop = "ANY"): ...
signature(from = "numeric", to = "abIndex"): ...
signature(from = "abIndex", to = "numeric"): ...
signature(from = "abIndex", to = "integer"): ...
signature(x = "abIndex"): ...
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.
signature(e1 = "abIndex", e2 = "abIndex"): ...
signature(e1 = "abIndex", e2 = "numeric"): ...
signature(x = "abIndex"): ...
("abIndex"): simple show method,
building on show(<rleDiff>).
("abIndex"): works analogously to regular vectors.
("abIndex"): ditto.
library(utils, pos = "package:base", verbose = FALSE)
showClass("abIndex")
ii <- c(-3:40, 20:70)
str(ai <- as(ii, "abIndex"))# note
ai # -> show() method
stopifnot(identical(-3:20,
as(abIseq1(-3,20), "vector")))
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