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

From: ONKELINX, Thierry <Thierry.ONKELINX_at_inbo.be>
Date: Tue, 30 Oct 2012 12:13:55 +0000

x = c(1,3,NA,5)
y = c(2,NA,4,1)
colSums(rbind(x, y), na.rm = TRUE)

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance Kliniekstraat 25
1070 Anderlecht
Belgium
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx_at_inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-devel-bounces_at_r-project.org [mailto:r-devel-bounces_at_r-project.org] Namens Matthew Dowle Verzonden: dinsdag 30 oktober 2012 12:03 Aan: r-devel_at_r-project.org
Onderwerp: [Rd] There is pmin and pmax each taking na.rm, how about psum?

Hi,

x = c(1,3,NA,5)
y = c(2,NA,4,1)

min(x,y,na.rm=TRUE) # ok
[1] 1

max(x,y,na.rm=TRUE) # ok
[1] 5

sum(x,y,na.rm=TRUE) # ok
[1] 16

pmin(x,y,na.rm=TRUE) # ok
[1] 1 3 4 1
pmax(x,y,na.rm=TRUE) # ok
[1] 2 3 4 5

psum(x,y,na.rm=TRUE)
[1] 3 3 4 6 # expected result
Error: could not find function "psum" # actual result

I realise that + is already like psum, but what about NA?

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

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

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