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Average for repeated elements in a column


 
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# 1  
Old 02-15-2011
Average for repeated elements in a column

I have a file that looks like this
Code:
 452    025_E3
 8    025_E3
 82    025_F5
 135    025_F5
 5    025_F5
 23    025_G2
 38    025_G2
 71    025_G2
 9  026_A12
 81    026_A12
 10    026_A12

some of the elements in column2 are repeated.
I want an output file that will extract the average of the numbers in the first column when the elements in the second column are repeated.

The output file will look like this

Code:
 230    025_E3
 74    025_F5
 44    025_G2
 33  026_A12

Thank you in advance
# 2  
Old 02-15-2011
Code:
nawk '{r[$2]++;s[$2]+=$1}END{for(i in r) if (r[i]>1) print int(s[i]/r[i]), i}'  myFile

This User Gave Thanks to vgersh99 For This Post:
 

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