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Top Forums UNIX for Dummies Questions & Answers Averaging the rows using 'awk' Post 302423905 by arvindr on Sunday 23rd of May 2010 07:08:38 AM
Old 05-23-2010
Averaging the rows using 'awk'

Dear all,
I have the data in the following format. I want to do average of each NR= 5 (rows) for all the 3 ($1,$2, $3) columns and want to print average result in another file in the same format. I dont know how to write code for this in 'awk', can some one help me to write a code for this in "awk".

Code:
   $1                  $2                  $3
   4.000000E+03        4.990302E+00        5.557000E+00
   4.000050E+03        4.998532E+00        5.557000E+00
   4.000100E+03        4.995319E+00        5.557000E+00
   4.000150E+03        5.003360E+00        5.557000E+00
   4.000200E+03        5.000279E+00        5.557000E+00
   4.000250E+03        5.008273E+00        5.557000E+00
   4.000300E+03        5.005232E+00        5.557000E+00
   4.000350E+03        5.013134E+00        5.557000E+00
   4.000400E+03        5.010103E+00        5.557000E+00
   4.000450E+03        5.017992E+00        5.557000E+00
   4.000500E+03        5.014914E+00        5.557000E+00
   4.000550E+03        5.022835E+00        5.557000E+00
   4.000600E+03        5.019675E+00        5.557000E+00
   4.000650E+03        5.027411E+00        5.558000E+00
   4.000700E+03        5.024382E+00        5.558000E+00
   4.000750E+03        5.032073E+00        5.558000E+00
   4.000800E+03        5.029087E+00        5.558000E+00
   4.000850E+03        5.036683E+00        5.558000E+00
..................... ...................... ......................
.................... ....................... ........................


Last edited by Scott; 05-23-2010 at 08:25 AM.. Reason: Please use code tags
 

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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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