[R] A question on Duplicating

[Keith Jewell]

Unless I've made a mistake (it happens!) that gives FALSE on the data which 
the OP said should give TRUE.
Ravi Varadhan suggested
  duplicated(a) & duplicated(b)
but that gives the same result for
  b <- c("n", "m", "o", "m")
for which I think the OP would like FALSE

I think this may do it
  all((a %in% a[duplicated(a)]) == (b %in% b[duplicated(b)]))

Hope that helps

Keith J

<rex.dwyer at syngenta.com> wrote in message 
news:36180405F8418449918AD20618D110FC094E9DB3AE at USETCMSXMB02.NAFTA.SYNGENTA.ORG...
> ab = paste(a,b,sep=";~;~;~")
> flag = length(ab)==length(unique(ab))
>
> This should work unless you use 3 consecutive winking elephants in other 
> places in your program.
>
>
>
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] 
> On Behalf Of Nipesh Bajaj
> Sent: Wednesday, February 09, 2011 10:12 AM
> To: r-help at r-project.org
> Subject: [R] A question on Duplicating
>
> Hello I am struggling to accomplice an idea which is as follows:
>
> I have a vector say: a <- c("a", "b", "c", "a") and another: b <- c("m",
> "n", "o", "m"). Length of those 2 vectors are essentially be same. Here 
> task
> is to check the duplicates in the vector 'a' and then to check whether any
> duplicates are there in the same places of 'b'. If not, flag a FALSE.
>
> I above example, it is correct hence TRUE. However in general how can I
> implement this?
>
> Can somebody please help me?
>
> Thanks,
>
>        [[alternative HTML version deleted]]
>
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