R: Expand a String with Respect to a Target Table

char.expand {base}

R Documentation

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.

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.

Examples

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