[R] return NA instead zero when summing over an empty range?

[Martin Ivanov]

 Dear R users,

the colSums function from the base package returns zero if there are no values in a range to be summed over (after removing missing values with na.rm = TRUE). Is there some way to make it return NA in that case just like colMeans does? Or any other function or some good way to achieve that? Any ideas are be welcome.

Regards,
Martin Ivanov

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