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Top Forums Shell Programming and Scripting AWK script for standard deviation / root mean square deviation Post 302590404 by chrisjorg on Monday 16th of January 2012 05:03:40 AM
Old 01-16-2012
Hi,
ok,
I understand I was not clear enough.

Code:
BEGIN {s_0=0;n_0=0}
      {n_0++;s_0+=($50-$1)^2}
END {print sqrt(s_0/n_0)}

BEGIN {s_1=0;n_1=0}
      {n_1++;s_1+=($50-$2)^2}
END {print sqrt(s_1/n_1)}
...
BEGIN {s_50=0;n_50=0}
      {n_50++;s_50+=($50-$50)^2}
END {print sqrt(s_50/n_50)}


I have written a code to work on a document with 50 columns of data to calculate the RMSD of each column of data relative to the last column of data.

The script is pretty primitive, and involves 50 different variables. Is there a way I could make it automatic by simply incrementing the n_x variable instead of having to define the 50 variables manually. Also, instead of defining the last column as $50 how do I do it with an $NF?
 

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Test::use::ok(3)					User Contributed Perl Documentation					  Test::use::ok(3)

NAME
Test::use::ok - Alternative to Test::More::use_ok SYNOPSIS
use ok 'Some::Module'; DESCRIPTION
According to the Test::More documentation, it is recommended to run "use_ok()" inside a "BEGIN" block, so functions are exported at compile-time and prototypes are properly honored. That is, instead of writing this: use_ok( 'Some::Module' ); use_ok( 'Other::Module' ); One should write this: BEGIN { use_ok( 'Some::Module' ); } BEGIN { use_ok( 'Other::Module' ); } However, people often either forget to add "BEGIN", or mistakenly group "use_ok" with other tests in a single "BEGIN" block, which can create subtle differences in execution order. With this module, simply change all "use_ok" in test scripts to "use ok", and they will be executed at "BEGIN" time. The explicit space after "use" makes it clear that this is a single compile-time action. SEE ALSO
Test::More CC0 1.0 Universal To the extent possible under law, XX has waived all copyright and related or neighboring rights to Test-use-ok. This work is published from Taiwan. <http://creativecommons.org/publicdomain/zero/1.0> POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 45: Non-ASCII character seen before =encoding in 'XX'. Assuming UTF-8 perl v5.18.2 2012-09-11 Test::use::ok(3)
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