iterators (version 1.0.2)

isplit: Split Iterator

Description

Returns an iterator that divides the data in the vector x into the groups defined by f.

Usage

isplit(x, f, drop=FALSE, ...)

Arguments

x

vector or data frame of values to be split into groups.

f

a factor or list of factors used to categorize x.

drop

logical indicating if levels that do not occur should be dropped.

...

current ignored.

Value

• The split iterator.

See Also

split

Examples

x <- rnorm(200)
f <- factor(sample(1:10, length(x), replace=TRUE))

it <- isplit(x, f)
expected <- split(x, f)

for (i in expected) {
  actual <- nextElem(it)
  stopifnot(actual$value == i)
}