[R] Compare each element of a list to a vector

[William Dunlap]

Try
  > datalist %in% list(x)
  [1]  TRUE FALSE FALSE FALSE
Both arguments, e1 and e2, of e1 %in% e2 should be of the same type:
e1 %in% e2 is comparing e1[i] and e2[j].

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of mtb954 at gmail.com
> Sent: Sunday, February 03, 2013 10:15 AM
> To: r-help at r-project.org
> Subject: [R] Compare each element of a list to a vector
> 
> Hello R-helpers,
> 
> I have a vector
> 
> x<-c(1,2,3)
> 
> and a list that contains vectors
> 
> datalist<-list(c(1,2,3),c(2,3,4),c(3,4,5),c(4,5,6))
> 
> and I would like to identify those list elements that are identical to x.
> 
> I tried
> 
> > datalist %in% x
> [1] FALSE FALSE FALSE FALSE
> 
> but I am obviously using %in% incorrectly. I also tried messing around with
> lapply but I can't figure out how to specify the function within lapply.
> 
> I would appreciate any suggestions you may have.
> 
> Many thanks!
> 
> Mark Na
> 
> 	[[alternative HTML version deleted]]
> 
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