[R] subseting a data frame

[nathalie]

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



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