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Full Discussion: Standard deviation in awk
Top Forums Shell Programming and Scripting Standard deviation in awk Post 302549171 by gd9629 on Monday 22nd of August 2011 11:19:10 AM
Old 08-22-2011
Hi Roboticus,

I've tried combining the codes you've given me into

Code:
function std_dev(data, count) {
    sum=0;
    for( x=1; x <= count; x++) {
        sum += data[x];
    }

    avg = sum/count;

    sumsq=0;
    for( x=1; x <= count; x++) {
        sumsq += (data[x] - avg)^2;
    }

    print sqrt(sumsq/count);
}


BEGIN {
    cnt = 0;
}


END {
    std_dev(array17, cnt); std_dev(array19, cnt); std_dev(array20, cnt);
}

{
   array17[cnt]=$17; array19[cnt]=$19; array20[cnt]=$20; cnt++;
   if (cnt==720) {
      print std_dev(array17, cnt) " " std_dev(array19, cnt)
       " " std_dev(array20, cnt);
   }
	
}

Unfortunately this just gives me a few numbers, the meaning of which I'm unsure lol

Code:
71.1077
0.178527
 
0.0675481
38.6887
0.825408
0.140382

How should I edit the script further to give the 3 separate columns of SD values?

Thanks!

---------- Post updated at 04:19 PM ---------- Previous update was at 09:58 AM ----------

Hmm I've tried this now

Code:
BEGIN {
    cnt = 0;
}


END {
    std_dev(array17, cnt); std_dev(array19, cnt); std_dev(array20, cnt);
}

{
   array17[cnt++] = $17; array19[cnt++] = $19; array20[cnt++] = $20;
   
   if (cnt==720) {
    print  std_dev(array17, cnt) " " std_dev(array19, cnt)
       " " std_dev(array20, cnt); 
	   cnt = 0; 
	  
   }
	
}

and get this as my results

Code:
272.963
1.14211
 
0.477465
251.055
1.05022
 
0.446297
232.296
1.00244
 
0.43713
222.966
0.970351
 
0.412753
219.27
0.957796
 
0.404489
216.511
0.948255

Any ideas?
Last edited by gd9629; 08-22-2011 at 11:02 AM..
 

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LEARN ABOUT DEBIAN

locale::currency

Locale::Currency(3perl) 				 Perl Programmers Reference Guide				   Locale::Currency(3perl)

NAME

       Locale::Currency - standard codes for currency identification

SYNOPSIS

	   use Locale::Currency;

	   $curr = code2currency('usd');     # $curr gets 'US Dollar'
	   $code = currency2code('Euro');    # $code gets 'eur'

	   @codes   = all_currency_codes();
	   @names   = all_currency_names();

DESCRIPTION

       The "Locale::Currency" module provides access to standard codes used for identifying currencies and funds, such as those defined in ISO
       4217.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 4217
       three-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying currencies. The ones currently supported are:

       alpha
	   This is a set of three-letter (uppercase) codes from ISO 4217 such as EUR for Euro.

	   Two of the codes specified by the standard (XTS which is reserved for testing purposes and XXX which is for transactions where no
	   currency is involved) are omitted.

	   This code set is identified with the symbol "LOCALE_CURR_ALPHA".

	   This is the default code set.

       num This is the set of three-digit numeric codes from ISO 4217.

	   This code set is identified with the symbol "LOCALE_CURR_NUMERIC".

ROUTINES

       code2currency ( CODE [,CODESET] )
       currency2code ( NAME [,CODESET] )
       currency_code2code ( CODE ,CODESET ,CODESET2 )
       all_currency_codes ( [CODESET] )
       all_currency_names ( [CODESET] )
       Locale::Currency::rename_currency  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Currency::add_currency  ( CODE ,NAME [,CODESET] )
       Locale::Currency::delete_currency  ( CODE [,CODESET] )
       Locale::Currency::add_currency_alias  ( NAME ,NEW_NAME )
       Locale::Currency::delete_currency_alias	( NAME )
       Locale::Currency::rename_currency_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Currency::add_currency_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Currency::delete_currency_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes man page.

SEE ALSO

       Locale::Codes
       Locale::Constants
       http://www.iso.org/iso/support/currency_codes_list-1.htm
	   The ISO 4217 data.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001	  Michael Hennecke
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2011 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2011-09-26						   Locale::Currency(3perl)
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