coalesce: Replace NAs in parallel vectors

In nfultz/stackoverflow: Stack Overflow's Greatest Hits

Description

Replaces NA elements of x with corresponding element of y, and NA elements of that with corresponding element from dots.

Usage

coalesce(x, y, ...)

Arguments

x	a vector
y	replacement values
...	further replacement values

Value

x with NAs replaced with y

Changes

Rather than using eagerly evaluating the dot arguments and Reducing over them, instead we use recursion to evaluate them lazily.

Author(s)

Gregor Thomas,

References

https://stackoverflow.com/a/19254510/986793

Examples

x <- c(1:4, NA, 1:4, NA)
y <- c(1:9, NA)
z <- c(NA, NA, 1:8)
coalesce(x,y,z) 

nfultz/stackoverflow documentation built on Aug. 4, 2020, 5:31 a.m.