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[Solved] awk calculating between lines

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# 1  
Old 11-08-2011
[Solved] awk calculating between lines
Hey guys, maybe you can help me with this...

I want to read input.dat line by line, while doing a simple calculation between the second column value of the current line and the second column value of the next line (like a difference).

input is something like this:

0 3.945757
1 3.993309
2 3.978133
3 3.961416
4 3.932156
5 3.96119
6 3.908535
7 3.881522
8 3.90588
9 4.008574
10 3.89227

output should be:

0.047552
-0.01518
-0.01672
-0.02926
0.029034
-0.05265
-0.02701
0.024358
0.102694
-0.1163

This is what I have so far...
Code:
awk '{x1=$2;getline; diff=$2-x1; print diff}' < input.dat

The problem is I don't "jump back" to the previous line after the calculation with this one-liner and hence miss the value of every other line in the output...

Can you tell me how I can "jump back" or how to possibly circumvent the problem?

Cheers
# 2  
Old 11-08-2011
Code:
awk 'NR==1{s=$2;next}{print $2-s;s=$2}' file

This User Gave Thanks to Franklin52 For This Post:
origamisven
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