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AWK subtraction in multiple columns

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# 1  
Old 01-16-2009
AWK subtraction in multiple columns
AWK subtraction in multiple columns

Hi there,

Can not get the following:

input: 34523 934
9485 3847
394 3847
3456 9384
Code:
awk 'NR==1 {for (i = 1; i <= NF;  i++)  {n=$i; next}; {n-=$i} END  {print n}'  input

output: 21188 first column only, why?
I am not a programmer or student so please keep that in mind when answer.
Regards,
awkward
# 2  
Old 01-16-2009
For one, there seems to be a missing '}'

Additionally, you don't change the value of i which is set to 1 resulting to only the 1st column being used Smilie

Just like the way you use to get your initial value from the 1st record, I think that you should also use a for loop for the succeeding records.

It would also be a different scenario if you want 2 differences. Smilie
# 3  
Old 01-16-2009

Code:
awk '
NR == 1 { d1 = $1; d2 = $2; next }
{ d1 -= $1; d2 -= $2 }
END { print d1, d2 }' "$FILE"

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