Help with ask adding columns


 
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# 1  
Old 11-29-2012
Help with ask adding columns

Hello,

I am using AWK in UBUNTU 12.04.

I have a dataset as follows:

Code:
1 2 12 1 4 1 4 1 7 9 4 6 
1 2 4 5 7 8 45 7 4 5 7 5

What I want to do is to add the values of some columns to each other and print it in the same file as the new column while omitting the previous two columns to have output as follows as an example:

1+4+4=9 2+1+6=9


So:
Code:
9 9 12 1 4 1 7 9 
53 14 4 5 7 8 4 5

thank you very much

Last edited by Homa; 11-29-2012 at 11:35 AM..
# 2  
Old 11-29-2012
Assuming your file structure as it is.

Try....

Code:
 awk '{ $1=$1+$7+$(NF-1);$2=$2+substr($8,1,1)+$NF;$7=$8="";gsub(" +"," ",$0);NF-=2;}1' file

This User Gave Thanks to pamu For This Post:
# 3  
Old 11-29-2012
Thanks a lot. Could you please explain these two parts of the code:

Code:
substr($8,1,1)
gsub(" +"," ",$0)
NF-=2;

# 4  
Old 11-29-2012
Quote:
Originally Posted by Homa
Thanks a lot. Could you please explain these two parts of the code:

Code:
substr($8,1,1)
gsub(" +"," ",$0)
NF-=2;

I think you have edited your previous input....Smilie

As per your previous input i have considered as you want only first digit of $8.

That's why i used substr()

substr($8,1,1) - Prints only first digit of $8

gsub(" +"," ",$0) - Replaces multiple spaces with single space. To get the FS as single space.Smilie

NF-=2 - Here we need to remove last two numbers. That's why we have edited NF to NF-2. So NF is reduced by 2.

As per your current input you can remove that substr()Smilie

use

Code:
awk '{ $1=$1+$7+$(NF-1);$2=$2+$8+$NF;$7=$8="";gsub(" +"," ",$0);NF-=2;}1' file

This User Gave Thanks to pamu For This Post:
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