Generation of abstract index vectors, i.e., objects of class
"abIndex".
abIseq() is designed to work entirely like seq,
but producing "abIndex" vectors.
abIseq1() is its basic building block, where
abIseq1(n,m) corresponds to n:m.
c(x, ...) will return an "abIndex" vector, when x
is one.
abIseq1(from = 1, to = 1)
abIseq (from = 1, to = 1, by = ((to - from)/(length.out - 1)),
length.out = NULL, along.with = NULL)# S3 method for abIndex
c(...)
An abstract index vector, i.e., object of class
"abIndex".
the starting and (maximal) end value of the sequence.
number: increment of the sequence.
desired length of the sequence. A
non-negative number, which for seq and seq.int will be
rounded up if fractional.
take the length from the length of this argument.
in general an arbitrary number of R objects; here,
when the first is an "abIndex" vector, these
arguments will be concatenated to a new "abIndex" object.
the class abIndex documentation;
rep2abI() for another constructor;
rle (base).
stopifnot(identical(-3:20,
as(abIseq1(-3,20), "vector")))
try( ## (arithmetic) not yet implemented
abIseq(1, 50, by = 3)
)
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