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Full Discussion: Use awk to read multiple files twice
Top Forums UNIX for Advanced & Expert Users Use awk to read multiple files twice Post 302605996 by scandy on Friday 9th of March 2012 10:09:28 AM
Old 03-09-2012
Sure, I will try my best. okay heres two files test1.txt and test2.txt:

Code:
test1.txt

0,0.0-0.1,0.00087
0,0.0-0.1,0.00089
1,0.1-0.2,0.00100
1,0.1-0.2,0.00074
1,0.1-0.2,0.00097
2,0.2-0.4,0.00208
2,0.2-0.4,0.00218
2,0.2-0.4,0.00227
3,0.9-1.0,0.00845
3,0.9-1.0,0.01016

Code:
test2.txt

0,0.0-0.1,0.00118
0,0.0-0.1,0.00131
0,0.0-0.1,0.00101
1,0.1-0.2,0.00015
1,0.1-0.2,0.00038
1,0.1-0.2,0.00122
2,0.2-0.4,0.00219
2,0.2-0.4,0.00214
2,0.2-0.4,0.00216
2,0.2-0.4,0.00199
3,0.9-1.0,0.01002
3,0.9-1.0,0.01070

the final output should be:
Code:
index    mean    std
0           m0        std0
1           m1        std1
2           m2       std2
3           m3        std3

where m0-3 are the global mean values for each index and std0-3 are the global standard deviations corresponding to each index. The index values are the ones given in the first column of each file. The third column is the one that I have to find global mean and std for.
Now I can calculate just the mean over all files fine. But the problem comes once I know the mean then how do I force awk to rescan all the files and use this mean to calculate the standard deviation.

Heres my awk code for calculating global mean:
Code:
#!/bin/awk -f
BEGIN{
    FS = ",";
    OFS = "\t";
    glbcnt[""]=0;
    glbacc[""]=0;
    glbprcn[""]=0;
}
{
    #print FILENAME;
    #if(FNR > 1){
        glbacc[$1] += $3;
        glbcnt[$1]++;
     #   }
}
END{
    for (i in glbcnt){
        if(i != ""){
            glbacc[i] = glbacc[i]/glbcnt[i];
            print i, glbacc[i], glbcnt[i]; 
        }
    }
}

which I call like this:
Code:
awk -f test.awk test*.txt

where tes.awk is my awk script and the test*.txt are all my txt files having the 3 column values.
Hope now its more clear.
 

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LEARN ABOUT OSX

locale::codes::langfam

Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a
       constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

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

COPYRIGHT

	  Copyright (c) 2011-2012 Sullivan Beck

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

perl v5.16.2							    2012-10-11					       Locale::Codes::LangFam(3pm)
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