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

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Tue Oct 30 13:13:55 CET 2012

```Why don't you make a matrix and use colSums or rowSums?

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?

x+y
[1]  3 NA NA  6        # can't supply `na.rm=TRUE` to `+`

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

______________________________________________
R-devel at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
* * * * * * * * * * * * * D I S C L A I M E R * * * * * * * * * * * * *
Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document.
The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document.

```