i_slice | R Documentation |
Constructs an iteror that returns elements from an iterable following the
given sequence with starting value start
and ending value end
.
The sequence's step size is given by step
.
i_slice(object, start = 1, end = NULL, step = 1, ...)
object |
iterable object through which this function iterates |
start |
the index of the first element to return from |
end |
the index of the last element to return from |
step |
the step size of the sequence |
... |
passed along to |
The iterable given in object
is traversed beginning with element
having index specified in start
. If start
is greater than 1,
then elements from the object
are skipped until start
is
reached. By default, elements are returned consecutively. However, if the
step
size is greater than 1, elements in object
are skipped.
If stop
is Inf
(default), the iteration continues until the
iteror is exhausted unless end
is specified. In this case,
end
specifies the sequence position to stop iteration.
Originally from package itertools2
.
iteror that returns object
in sequence
it <- i_slice(1:5, start=2)
nextOr(it, NULL) # 2
nextOr(it, NULL) # 3
nextOr(it, NULL) # 4
nextOr(it, NULL) # 5
it2 <- i_slice(1:10, start=2, end=5)
unlist(as.list(it2)) == 2:5
it3 <- i_slice(1:10, start=2, end=9, step=2)
unlist(as.list(it3)) == c(2, 4, 6, 8)
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