case: Map elements of a vector according to the provided 'cases'

In warnes/gdata: Various R Programming Tools for Data Manipulation

Map elements of a vector according to the provided 'cases'

Description

Map elements of a vector according to the provided 'cases'. This function is useful for mapping discrete values to factor labels and is the vector equivalent to the switch function.

Usage

case(x, ..., default = NA)

Arguments

x	Vector to be converted
...	Map of alternatives, specified as "name"=value
default	Value to be assigned to elements of x not matching any of the alternatives. Defaults to NA.

Details

This function is to switch what ifelse is to if, and is a convenience wrapper for factor.

Value

A factor variables with each element of x mapped into the corresponding level of specified in the mapping.

Author(s)

Gregory R. Warnes [e-mail]

See Also

factor, switch, ifelse

Examples

## default = NA
case(c(1,1,4,3), "a"=1, "b"=2, "c"=3)

## default = "foo"
case(c(1,1,4,3), "a"=1, "b"=2, "c"=3, default="foo")

warnes/gdata documentation built on Dec. 5, 2023, 12:20 a.m.