Dear all,

I have two probably very easy questions:

(1) Is there a way to access certain variables by their string-based name representation?

Example:
numbers <- c("one", "two", "three")
varname <- "numbers"
print(varname[2])

(2) I need this functionality for a customized na.exclude() function that I am building, which should only exclude rows that have NA in certain columns. Maybe there is already a function which does exactly what I need, so I'd highly appreciate if someone could point me there ;)

My current implementation looks like this:

naexlcude <- function(data, varnames)
{
        for(v in varnames){
                data = subset(data, !is.na(v))
        }

        data
}

Best
Philipp

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