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

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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.

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).

See Also

charmatch and pmatch for performing partial string matching.

Examples

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

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