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Full Discussion: Normalize a dataset with AWK
Top Forums Shell Programming and Scripting Normalize a dataset with AWK Post 302294549 by otheus on Thursday 5th of March 2009 11:49:02 AM
Old 03-05-2009
I don't know what you mean by "normalize". Do you mean to put every column in terms of number of deviations from the mean? Would you have one output row, or one row for each row of input?

Your code is pretty good, but has a few bugs.
Code:
BEGIN{ FS="," }
{
    for(i=1;i <=  NF;i++)
    {
        total[i]+=$i;
        totalSquared[i]+=$i^2;
    }
    numberColumn=NF;
}
END{
    for (i=1;i <= numberColumn;i++)
    {
        media=total[i]/NR;
        printf("%.2f|%.2f\n",media,sqrt((totalSquared[i]/NR)-media^2));
    }
}

 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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