[BioC] conditional merge of duplicated rows in data.frame

[Ninni Nahm [guest]]

Hi all!

I have the following problem.

  chr13  1260 1275   chr13_38134720_38136919
  chr13  1261 1276   chr13_38134720_38136919
  chr15   839  854   chr15_63332831_63335030
  chr15   840  856   chr15_63332831_63335030
  chr15   837  852   chr15_63332831_63335030
  chr15   842  857   chr15_63332831_63335030
In the 2. and 3. column are positions which I want to combine whenever the value in column 4 is the same. For example, I would want:

  chr13  1260 1276   chr13_38134720_38136919
  chr15   837  857   chr15_63332831_63335030
Any help is highly appreciated!!!

 -- output of sessionInfo(): 

sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base 

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