[R] ?to calculate sth for groups defined between points in one	variable (string),	/ value separating/ spliting variable into groups by i.e. between	start, NA, NA, stop1, start2, NA, stop2
    Eugeniusz Kaluza 
    Eugeniusz.Kaluza at polsl.pl
       
    Thu Jun 24 13:18:36 CEST 2010
    
    
  
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