[Rd] There is pmin and pmax each taking na.rm, how about psum?

[Hadley Wickham]

> Is there a case to add psum? Or have I missed something.

If psum, then why not pdiff (-), pprod (*) and precip (/) ?  And
similarly, what about equivalent functions for ^, %%, %/%, &, and | ?

Hadley

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RStudio / Rice University
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