Hi R experts.

how can I average two sets of columns?

dd <- data.frame(b = c("chr2", "chr1", "chrY", "chr13", "chrX"),  
      w=11:15, x = 1:5, y = c(8, 3, 9, 9,7), 
       z = c(1, 1, 1, 2, 8))
expected result for mean(w,x) and mean(y,z) is
1  chr2 6  4.5
2  chr1 7  2
3  chrY 8  5
4 chr13 9  5.5
5  chrX 10 7.5

Yu




      
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