[R] subseting a data frame

[R. Michael Weylandt <michael.weylandt@gmail.com>]

I believe you want the duplicated() function.

Michael

On Mar 2, 2012, at 10:19 AM, nathalie <nac at sanger.ac.uk> wrote:

> HI,
> this is my problem I want to subset this file df, using only  unique df$exon printing the line once even if  df$exon appear several times:
> 
> unique(df$exon) will show me the unique exons
> If I try to print only the unique exon lines
> with df[unique(df$exon),] -this doesn't print only the unique ones :(
> 
> could you help?
> thanks
> Nat
> 
> 
> 
> 
>                        exon size  chr     start       end
> 413077 ChrX_133594175_133594368_HPRT1  193 ChrX 133594175 133594368
> 413270 ChrX_133594183_133594368_HPRT1  185 ChrX 133594183 133594368
> 413455 ChrX_133594381_133594565_HPRT1  184 ChrX 133594381 133594565
> 413639 ChrX_133607389_133607495_HPRT1  106 ChrX 133607389 133607495
> 413745 ChrX_133607389_133607495_HPRT1  106 ChrX 133607389 133607495
> 413851 ChrX_133607404_133607495_HPRT1   91 ChrX 133607404 133607495
> 413942 ChrX_133609211_133609394_HPRT1  183 ChrX 133609211 133609394
> 414125 ChrX_133609211_133609394_HPRT1  183 ChrX 133609211 133609394
> 414308 ChrX_133620495_133620560_HPRT1   65 ChrX 133620495 133620560
> 414373 ChrX_133620495_133620560_HPRT1   65 ChrX 133620495 133620560
> 414438 ChrX_133620692_133620696_HPRT1    4 ChrX 133620692 133620696
> 414442 ChrX_133624218_133624235_HPRT1   17 ChrX 133624218 133624235
> 
> 
> 
> -- 
> The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE.
> 
> ______________________________________________
> R-help at 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.