Created
September 5, 2020 15:01
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averaging grouped values, rounding upwards
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#!/usr/bin/env bash | |
unset key | |
cat data.csv | # reads from data.csv | |
tail -n +2 | # removes first line | |
tr -d ' ' | # removes all spaces | |
cut -d ',' -f1,3 | # takes first and third field | |
# from here on this program: | |
# calling the right-hand field (string) the key, | |
# and the left-hand field (positive integers) the values, | |
# groups by key, returning a rounded-upwards average of the values, | |
# as, in order, key and the average, separated by a tab character | |
tr ',' '\t' | # replaces commas with tabs | |
uniq -f 1 --group=append | | |
# ↑ groups by key, by appending a blank line after each key-group | |
while read -r value lkey | |
# fits each group in a single | |
# "key value value value..." line | |
do | |
if [[ ! -z $value ]] | |
then | |
if [[ ! -v key ]] | |
then | |
key=$lkey; echo -ne "$key" | |
elif [[ $lkey != $key ]] | |
then | |
exit 13 | |
fi | |
echo -ne "\t${value}" | |
else | |
unset key | |
echo | |
fi | |
done | | |
awk \ | |
# averages the values in each line, | |
# rounding the average up. | |
'{ sum=0; num=0; | |
for (i=2;i<=NF;i++) | |
{sum+=$i; num++ } ; | |
sum=sum/num ; | |
num=int(sum) ; | |
sum=(sum>num ? num+1 : num) ; | |
printf "%s\t%d\n", $1, sum }' |
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