1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
\name{case}
\alias{case}
\title{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 \code{switch} function.
}
\usage{
case(x, \dots, default = NA)
}
\arguments{
\item{x}{Vector to be converted}
\item{\dots}{Map of alternatives, specified as "name"=value}
\item{default}{Value to be assigned to elements of \code{x} not
matching any of the alternatives. Defaults to \code{NA}.}
}
\details{
This function is to \code{switch} what \code{ifelse} is to \code{if},
and is a convenience wrapper for \code{factor}.
}
\value{
A factor variables with each element of \code{x} mapped into the
corresponding level of specified in the mapping.
}
\author{Gregory R. Warnes \email{greg@warnes.net}}
\seealso{\code{factor}, \code{switch}, \code{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")
}
\keyword{manip}
|
