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Top Forums Shell Programming and Scripting [Solved] awk calculating between lines Post 302571704 by origamisven on Tuesday 8th of November 2011 04:46:35 AM
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
 

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SPLIT(1)							   User Commands							  SPLIT(1)

NAME
split - split a file into pieces SYNOPSIS
split [OPTION]... [INPUT [PREFIX]] DESCRIPTION
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default size is 1000 lines, and default PREFIX is `x'. With no INPUT, or when INPUT is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -a, --suffix-length=N use suffixes of length N (default 2) -b, --bytes=SIZE put SIZE bytes per output file -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file -d, --numeric-suffixes use numeric suffixes instead of alphabetic -l, --lines=NUMBER put NUMBER lines per output file --verbose print a diagnostic just before each output file is opened --help display this help and exit --version output version information and exit SIZE may have a multiplier suffix: b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y. AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. REPORTING BUGS
Report split bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for split is maintained as a Texinfo manual. If the info and split programs are properly installed at your site, the command info coreutils 'split invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 SPLIT(1)
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