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.
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
locPars <- c("mean", "median", "mode")
char.expand("me", locPars, warning("Could not expand!"))
char.expand("mo", locPars)
[Package base version 4.6.0 Index]