问题
I have a datafile with 10 columns as given below
ifile.txt
2 4 4 2 1 2 2 4 2 1
3 3 1 5 3 3 4 5 3 3
4 3 3 2 2 1 2 3 4 2
5 3 1 3 1 2 4 5 6 8
I want to add 11th column which will show the average of each rows along 10 columns. i.e. AVE(2 4 4 2 1 2 2 4 2 1) and so on. Though my following script is working well, but I would like to make it more simpler and short. I appreciate, in advance, for any kind help or suggestions in this regard.
awk '{for(i=1;i<=NF;i++){s+=$i;ss+=$i}m=s/NF;$(NF+1)=ss/NF;s=ss=0}1' ifile.txt
回答1:
This should work
awk '{for(i=1;i<=NF;i++)x+=$i;$(NF+1)=x/NF;x=0}1' file
For each field you add the value to x in the loop.
Next you set field 11 to the sum in xdivided by the number of fields NF.
Reset x to zero for the next line.
1 equates to true and performs the default action in awk which is to print the line.
回答2:
is this helping
awk '{for(i=1;i<=NF;i++)s+=$i;print $0,s/NF;s=0}' ifile.txt
or
awk '{for(i=1;i<=NF;i++)ss+=$i;$(NF+1)=ss/NF;ss=0}1' ifile.txt
来源：https://stackoverflow.com/questions/31557317/average-from-different-columns-in-shell-script