base (version 3.2.5)

char.expand: Expand a String with Respect to a Target Table

Description

Seeks a unique match of its first argument among the elements of its second. If successful, it returns this element; otherwise, it performs an action specified by the third argument.

Usage

char.expand(input, target, nomatch = stop("no match"))

Arguments

input
a character string to be expanded.
target
a character vector with the values to be matched against.
nomatch
an R expression to be evaluated in case expansion was not possible.

Value

A length-one character vector, one of the elements of target (unless nomatch is changed to be a non-error, when it can be a zero-length character string).

Details

This function is particularly useful when abbreviations are allowed in function arguments, and need to be uniquely expanded with respect to a target table of possible values.

See Also

charmatch and pmatch for performing partial string matching.

Examples

Run this code
locPars <- c("mean", "median", "mode")
char.expand("me", locPars, warning("Could not expand!"))
char.expand("mo", locPars)

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