Require an argument to match the loadflex conventions for that argument name

This function is modeled on match.arg, but it is designed to facilitate consistency in how argument names are used within the loadflex package.

Usage

match.arg.loadflex(arg, choices, several.ok = FALSE)

Arguments

arg

An argument, passed as a symbol. May be a missing argument to the calling function.

choices

Optional. A vector of choices, character or logical, that should be accepted by partial matching.

several.ok

logical. If TRUE, a vector of several choices in arg will be accepted and returned as such.

Value

The argument after matching to the allowed options for that argument name. This may differ from the original value of arg if arg is a truncated version of one of the character options for the argument (identified using pmatch, as in match.arg.

Details

The key differences between this function and match.arg are that this function (1) decides what the available options are without reference to the defaults defined in the calling function, and (2) permits atomic but non-character choices.

Examples

# match.arg.loadflex knows about some variables by their names alone
flux.or.conc="conc"; flux.or.conc <- loadflex:::match.arg.loadflex(flux.or.conc)
attach.units=TRUE; attach.units <- loadflex:::match.arg.loadflex(attach.units)

# you can also pass in custom choices. as always, partial matching is available
ci.distrib="log"; ci.distrib <- loadflex:::match.arg.loadflex(ci.distrib, c("lognormal","normal"))