Hi all, I have these 4 csv files : File_1.csv 
target1,48,12,7
target2,17,16,2
target3,22,6,1

[download]
File_2.csv 
target5,14,12,8,,3,
target6,5,7,9,,,15

[download]
File_3.csv 
target1,,,,,,13
target2,,,,,,8
target4,,,,11,5,6

[download]
File_4.csv 
target1,,,,51,8
target2,,,,87,42
target4,22,3,7,,

[download]
And I want to merge them all specific to row and column each value is in(preserving column information also). My present code is working fine but its not able to preserve the column information for any value. Here goes my present script 
use strict;
use warnings;

print ("Now merging \n");
my $filenum = 0;

my ( %row_val, %data );
foreach my $file ( sort glob("*.csv") ) {

    $filenum++;
    open my $fh, "<", $file or die $!;

    while ( my $line = <$fh> ) {

        chomp $line;

        my ( $row_val, @values ) = split /,/, $line;

        $row_val{$row_val} = 1;

        $data{$filenum}{$row_val} = \@values;
    }

    close $fh;
}
foreach my $row_val ( sort keys %row_val ) {

    print $row_val, ",", join( ",", map { $data{$_}{$row_val} ? @{ $da
+ta{$_}{$row_val} } : ",," } 1 .. $filenum ), "\n";
}

[download]
The merged output(WRONG) generated by above code 
target1,48,12,7,,,,,,,,,13,,,,51,8
target2,17,16,2,,,,,,,,,8,,,,87,42
target3,22,6,1,,,,,,,,,
target4,,,,,,,,,,11,5,6,22,3,7
target5,,,,14,12,8,,3,,,,,,
target6,,,,5,7,9,,,15,,,,,,

[download]

-----DESIRED/CORRECT OUTPUT-----

target1,48,12,7,51,8,13
target2,17,16,2,87,42,8
target3,22,6,1,,,
target4,22,3,7,11,5,6
target5,14,12,8,,3,
target6,5,7,9,,,15

[download]

In reply to merging csv files into a third file preserving column & row by zing

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