Subtracting each row from the first row in a single column file using awk


 
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# 1  
Old 04-04-2012
Subtracting each row from the first row in a single column file using awk

Hi Friends,

I have a single column data like below.
Code:
1
2
3
4
5

I need the output like below.
Code:
0
1
2
3
4

where each row (including first row) subtracting from first row and the result should print below like the way shown in output file.

Thanks
Sid

Last edited by Scrutinizer; 04-04-2012 at 02:13 PM.. Reason: Code tags!
# 2  
Old 04-04-2012
That would do the trick .
Code:
awk '$1--{print}' sample_file

# 3  
Old 04-04-2012
You want row 2 (etc) subtracted from row 1, or row 1 subtracted from row 2?
# 4  
Old 04-04-2012
I want row1 need to be subtracted from all rows including row itself.

I need the following operation to be done.
(Row1-Row1)
(Row2-Row1)
(Row3-Row1)
...
So on..
The script "awk '$1--{print}'" is not giving correct output.
For the input of
Code:
1.1
2.5
3.2
4
5
6

I got the output as
Code:
0.1
1.5
2.2
3
4
5

which is not correct..
Can you please modify the script to match requirement.

Thanks
Sidda

Last edited by Scrutinizer; 04-04-2012 at 02:39 PM.. Reason: Code tags
# 5  
Old 04-04-2012
try:
Code:
awk 'NR==1{v=$1}{$1-=v}1' infile

# 6  
Old 04-04-2012
My sample can be anything..

But What I need is

"Row1-Row1"
"Row2-Row1"
"Row3-Row1"
"Row4-Row1"
.....
so on
in the output file.( whatever may be the input numeric data single column file)

Regards
Sid
# 7  
Old 04-04-2012
Try
Code:
awk 'FNR==1 {p=$1} {print $1-p}' file

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