R help - Feb 2009 - Delete row if first letter of row name is

Hello!

I am still a beginner.  Can you tell me how to delete a row (from a matrix or
data.frame) if the row name starts with U?  See example below:


      U179971039     0.058663    0.087575 
      empty1 -0.1296 -0.09105 
      empty2 0.136259 0.398073 
      empty3 0.446041 -0.33997 


Sally

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Try:

mydata[substr(rownames(mydata),1,1)!="U",]

where mydata is a matrix or data.frame.

________________________________________
Daniel Moreira, MD




"Sally" <sagoldes@shaw.ca> 
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02/14/2009 11:48 PM
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Sally <sagoldes@shaw.ca>


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[R] Delete row if first letter of row name is






Hello!

I am still a beginner.  Can you tell me how to delete a row (from a matrix 
or data.frame) if the row name starts with U?  See example below:


      U179971039     0.058663    0.087575 
      empty1 -0.1296 -0.09105 
      empty2 0.136259 0.398073 
      empty3 0.446041 -0.33997 


Sally

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