Here is one way to do it. I scan over all of the data loading it into $data. Then scan over that storing the sum and count of non negative items per row and appending the average to the end of the row. While doing that it also stores the per column counts and sums in array refs. Then after everything is done it appends a new row with the averages for each column. It could probably be shrunk down a bit but i figured i'd start it out verbose for you. 

#!/usr/bin/perl
use strict;
use warnings;

use Data::Dumper;

my $data;

#read all data into an AofA
while (<DATA>) {
   chomp;
   push @$data, [split (/,/, $_)];
}
my $cols = 11;
my $col_sum;
my $col_count;
my $cur_col;
for my $row (@$data) {
   my $row_sum;
   my $row_count;
   my $cur_col = 1;
   for my $val (@$row[1..$cols]) {
      if ($val != 0) {
        $row_sum += $val;
        $row_count++;
        $col_sum->[$cur_col] += $val;
        $col_count->[$cur_col]++;
      }
      $cur_col++;
   }
   push @$row, $row_sum/ $row_count;
}

#print Dumper({col_sum=>$col_sum, col_count=>$col_count});
push @$data, ["TOTAL", map { $col_sum->[$_] / $col_count->[$_] } 1..$c
+ols];

for my $row (@$data) {
   print join(",", @$row),"\n";
}


__DATA__
IMAGINGNY,1.45,0.42,1.54,1.49,1.47,1.36,1.81,0.47,1.8,0.55,0.38 
JBSQLTST,1.29,1.09,1.13,1.88,1.11,1.44,1.25,1.23,1.05,1.39,1.61 
SNYCSQL,4.58,4.24,3.87,3.9,4.13,2.04,3.34,7.6,3.58,1.26,7.45 
Snynetsrv,26,26.34,24.59,26.46,26.24,26.14,32.35,31.77,31.77,29.92,26.
+59 
W32SPLMCOR01,8.27,13.23,7.73,8.85,9.15,13.95,0,0,0,0,0 
W32SDAPSCT01,3.07,3.14,2.97,3.28,21.65,54.23,3.16,3.02,3.26,2.77,3.40 
W32SDASALM01,1.22,1.3,1.11,0.92,1.57,1.06,1.01,0.87,0.93,2.26,0.91 
W32SMSCSD02,15.38,12,22.32,23.3,19.74,46.42,2.06,1.7,2.17,2.85,1.74 
W32SPLMCOR02,13.24,13.23,7.73,8.85,9.15,13.95,0,0,0,0,0

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___________
Eric Hodges

In reply to Re: Calculating Column Averages From A CSV File by eric256
in thread Calculating Column Averages From A CSV File by country1

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