icompress: Iterator that filters elements where corresponding selector...

In itertools2: itertools2: Functions creating iterators for efficient looping

Description

Constructs an iterator that filters elements from iterable returning only those for which the corresponding element from selectors is TRUE.

Usage

icompress(object, selectors)

Arguments

object	an iterable object
selectors	an iterable that determines whether the corresponding element in object is returned.

Details

The iterator stops when either object or selectors has been exhausted.

Value

iterator object

Examples

# Filters out odd numbers and retains only even numbers
n <- 10
selectors <- rep(c(FALSE, TRUE), n)
it <- icompress(seq_len(n), selectors)
as.list(it)

# Similar idea here but anonymous function is used to filter out even
# numbers
n <- 10
it2 <- icompress(seq_len(10), rep(c(TRUE, FALSE), n))
as.list(it2)

it3 <- icompress(letters, letters %in% c('a', 'e', 'i', 'o', 'u'))
as.list(it3)

itertools2 documentation built on May 2, 2019, 3:37 p.m.