# [R] Re move repeated values

Peter Alspach PAlspach at hortresearch.co.nz
Wed Oct 8 22:20:51 CEST 2008

```Kathryn

?unique

> unique(c(-1,-1,0,2,2,2,2,4,4,5,5,5,5,5))
[1] -1  0  2  4  5

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of kathie
> Sent: Thursday, 9 October 2008 8:12 a.m.
> To: r-help at r-project.org
> Subject: [R] Re move repeated values
>
>
> Dear R users,
>
> I'd like to make this data
>
> 	rem.y = c(-1,0,2,4,5)
>
> from
>
> 	y = c(-1,-1,0,2,2,2,2,4,4,5,5,5,5,5).
>
> That is, I need to remove repeated values.
>
>
> Here is my code, but I don't think it is efficient.  How
> could I improve this?
>
>
> #-------------------------------------------------------------
> -----------
> y = c(-1,-1,0,2,2,2,2,4,4,5,5,5,5,5)
> n=length(y)
>
> for (i in 1:n)          # removed same values in y
> {
> 	imsi = 0
> 	if (i==1) {rem.y = y[i]}
> 	else {c = length(rem.y)
> 	      for (j in 1:c) { if (y[i]==rem.y[j]) imsi=1 }
> 	      if (imsi==0) rem.y = c(rem.y,y[i])} }
>
> rem.y
> #-------------------------------------------------------------
> ------------
>
>
> Any suggestion will be greatly appreciated.
>
> Regards,
>
> Kathryn Lord
> --
> View this message in context:
> http://www.nabble.com/Remove-repeated-values-tp19885503p19885503.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> and provide commented, minimal, self-contained, reproducible code.
>

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