Instead of ignore-NA versions of ">", "<", "==", etc., I prefer to factor out the ignore-NA part of things:
is.true <- function(x) !is.na(x) & x is.false <- function(x) !is.na(x) & !x used as > is.false(c(1,2,NA,4) > 3) [1] TRUE TRUE FALSE FALSE > is.true(c(1,2,NA,4) > 3) [1] FALSE FALSE FALSE TRUE or with any other expression that evaluates to a logical. subset() must have a similar thing buried in it and people use it for that but then get caught up in its nonstandard evaluation semantics. which() must also have it but you don't always want to convert to integer indexes. Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf > Of Berend Hasselman > Sent: Tuesday, October 30, 2012 2:26 PM > To: vincent guyader > Cc: r-help@r-project.org > Subject: Re: [R] "NA-friendly" operator > > > On 30-10-2012, at 22:08, vincent guyader wrote: > > > Hi everyone, > > > > i'm looking for a "NA-friendly" operator > > > > I explain : > > > > vec<-c(3,4,5,NA,1,NA,9,NA,1) > > > > vec[vec == 1] # NA 1 NA NA 1 > > > > I dont want the NA's : > > vec[vec == 1 & ! is.na(vec)]# 1 1 > > is the same as > > vec[vec %in% 1] # 1 1 > > > > %in% is NA-friendly :) > > > > But if i want >2 without the NA's : > > > > vec[vec>2] #3 4 5 NA NA 9 NA > > > > if i dont want the NA i have to do : > > > > vec[vec>2 & !is.na(vec)] #3 4 5 9 > > > > is there an opérator to directly do that? > > > You could define one > > "%>.nona%" <- function(x,y) x[x>y & !is.na(vec)] > > and use > > vec %>.nona% 2 > > Use ?`%in%` to see an example (in the Examples section) > > Berend > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
