safe: Safely apply a function

In tobyjohnson/gtx: Genetics ToolboX

Description

Convenience function to safely apply a function when the argument may have length zero.

Usage

safe(FUN, x, ...)

Arguments

FUN	a function to apply
x	first argument for FUN
...	additional arguments passed to FUN

Value

The result of FUN(x, ...) after preprocessing x, or NA if x has length zero after preprocessing.

Author(s)

Toby Johnson [e-mail]

Examples

## Not run: 
x <- 1:5
y <- rep("A", 5)
x[y == "B"]
min(x[y == "B"]) ## produces warning and returns Inf
safe(min, x[y == "B"]) ## returns NA

## End(Not run)

tobyjohnson/gtx documentation built on Aug. 30, 2019, 8:07 p.m.