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Calculating average for every Nth line in the Nth column

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# 1  
Old 04-12-2012
Calculating average for every Nth line in the Nth column
Is there an awk script that can easily perform the following operation?

I have a data file that is in the format of
Code:
1944-12,5.6
1945-01,9.8
1945-02,6.7
1945-03,9.3
1945-04,5.9
1945-05,0.7
1945-06,0.0
1945-07,0.0
1945-08,0.0
1945-09,0.0
1945-10,0.2
1945-11,10.5
1945-12,22.3
1946-01,35.2
1946-02,13.4

I need to find the average of the values contained within -01, -02, and -03.

For instance the average of
Code:
1945-01,9.8
1945-02,6.7
1945-03,9.3

Would output
Code:
1945-03, 8.6

Any help would be appreciative.
Thanks!
Last edited by Franklin52; 04-12-2012 at 10:18 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 04-12-2012
I'm not clear on whether your identifying column is '1945-05', '1945', or just '05'?

You could do something like:
Code:
awk -F, '{totals[$1]=+$2;counts[$1]++} END {for (i in totals) { print i, totals[i]/counts[i]}}' file

(1945-05)

Or:
Code:
awk -F"-|," '{totals[$2]=+$3;counts[$2]++} END {for (i in totals) { print i, totals[i]/counts[i]}}' file

(05 - $1 instead of $2 for 1945)
Last edited by CarloM; 04-12-2012 at 10:39 AM..
# 3  
Old 04-12-2012
I guess the 1944 etc. is the important identifier? Using -1,-2,-3 just to filter the relevant lines:
Code:
awk -F"[,-]" '/-0[123],/ {a[$1]+=$NF; c[$1]++} END{for(e in a)print e", "a[e]/c[e]}' infile
1945, 8.6
1946, 24.3

This User Gave Thanks to zaxxon For This Post:
ncwxpanther
# 4  
Old 04-12-2012
Thanks for the help !

zaxxon's script worked great.
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