Nothing
###########################################################################
# Internal functions (not documented)
############################################################################
"valid.one" <- function(x,type)
{
if(!eval(call(paste("is.",type,sep=""),x))||length(x)!=1) {
error <- paste("'",deparse(substitute(x)),"' must be a length-one object of type ",type,sep="")
stop(error)
}
}
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