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Full Discussion: [Solved] awk calculating between lines
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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LEARN ABOUT OSX

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD
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