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...This question survived when I asked on Stack Overflow : http://stackoverflow.com/questions/13123638/there-is-pmin-and-pmax-each-taking-na-rm-why-no-psum And a search of the archives found that has Gabor has suggested it too as an aside : http://r.789695.n4.nabble.com/How-to-do-it-without-for-loops-tp794745p794750.html If someone from R core is willing to sponsor the idea, I am willing to write, test and submit the code for psum. Implemented in a very similar fashion to pmin and pmax. Or perhaps it exists already in a package somewhere (I searched but didn't find it). Matthew