[R] Remove several numbers from a sequence

[PIKAL Petr]

Hi

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of penguins
> Sent: Monday, August 20, 2012 1:15 PM
> To: r-help at r-project.org
> Subject: Re: [R] Remove several numbers from a sequence
> 
> Hi!
> 
> Both yy[!(yy %in% xx)] and yy[is.na(match(yy,xx))] work a treat!
> 
> Developing this topic can anyone tell me how to extract rows which are
> not replicated across 2 data frames. For example:
> 
> z1<-c(1,2,3,4)
> z2<-c(5,6,7,8)
> zz<- data.frame(cbind(z1,z2))
> 
> x1<-c(3,4)
> x2<-c(7,8)
> xx<- data.frame(cbind(x1,x2))
> 
> so the result would be:
> 
> 1   5
> 2   6
> 
> Using setdiff(xx,zz) I can get the replicated rows but not the unique
> ones, and setdiff(zz,xx) returns the all rows.

I am not sure how setdiff works with data.frames }nothing is said in help page so you need to go to source.

sapply((zz),  function(x) x %in% t(xx))

gives you data frame with true values but I am not sure if it works only for this example or globally.
After that just check number of true values and select appropriate rows.

Regards
Petr

> 
> Many thanks
> 
> 
> 
> 
> 
> 
> 
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