frange: Efficient implementation of range.

In hadley/bigvis: Tools for visualisation of big data sets

Description

This is an efficient C++ implementation of range for numeric vectors: it avoids S3 dispatch, and computes both min and max in a single pass through the input.

Usage

frange(x, finite = TRUE)

Arguments

x	a numeric vector, or a ranged object
finite	If TRUE ignores missing values and infinities. Note that if the vector is empty, or only contains missing values, frange will return c(Inf, -Inf) because those are the identity values for min and max respectively.

Details

If x has a range attribute (e.g. it's a ranged object), it will be used instead of computing the range from scratch.

Examples

x <- runif(1e6)
system.time(range(x))
system.time(frange(x))

rx <- ranged(x)
system.time(frange(rx))

hadley/bigvis documentation built on May 17, 2019, 9:45 a.m.