Hello,

The solution of @Athanasius will have problems if you switch place bw 50 and 100 at the input data. My solution below is quite ugly but i think it will be more complete

NOTE: This solution requires that the columns of each input data must be aligned by the end character. But you can change my algorithm a little bit to adapt if you want.

Data Example: 

Data Not Ok
100     123
1.......1

Data Ok
100     123
1.........1

[download]

Here is my solution: 

use strict;
use warnings;
my @row;
while(my $line = <DATA>)
{
      my @arr;
      while(my ($elem) = $line =~ /(\s*\d+)/g)
      {
            push @arr, $elem;
            $line =~ s/(\s*$elem)/' ' x length($1)/e;
      }
      #Data 1014          1       10 
      #becomes 3 element "1014", "              1", "                 
+     10"
      push @row, \@arr;
}
#Sort element with same length, exchange position
foreach my $r1 (0 .. $#row)
{
      #Take 1 row as base, check other rows
      my @remain = grep !/$r1/,(0 .. $#row);
      foreach my $r2 (0..$#remain)
      {
       #Foreach element in row, find element with same length  
       #in different row (mean same column) -> check value and exchang
+e
            foreach my $c1 (0..$#{$row[$r1]})   
            {
                 foreach my $c2 (0..$#{$row[$r2]})
                 {
                     compare_wrap($row[$r1][$c1], $row[$r2][$c2]);    
+                                       
                 }      
            }
       }
}

map {print merge_str(@$_),"\n"} @row;
#SUPPORT FUNCTION
sub compare_wrap
{
    if( length($_[0]) == length($_[1]) && eval($_[0]) < eval($_[1]))  
+   
    {
         @_[0, 1] = @_[1, 0];   
    }
     
} 

sub merge_str
{
      foreach my $i (1 .. $#_)
      { 
            my $temp = ' ' x length($_[$i-1]);
            $_[$i] =~ s/$temp/$_[$i-1]/; 
      }
      $_[-1];
}
__DATA__
1014          1       10
1015    51      100   20
1016    11      101
1017    15  101

[download]

P/S: Update compare_wrap() as suggestion from kcott, sorry for that mis-spelling :]] !

Hope this could help :)

Regards,

ThBo

In reply to Re: Sorting a matrix based on the values of columns by redbull2012
in thread Sorting a matrix based on the values of columns by raghuprasad241

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