Hi Perlmonks,

I was trying to match the first column in three files (each file has 6 columns) and get the matching results in the output file. In this case, the first five columns in the three matching files are the same, but there is a difference in the last column for the three files. So, I tried to concatanate the last columns from the input files also in the output file. But, I was stuck with an error "expected fields to be an array ref at line 74 <$FILE1> line 2. I tried to make it an array ref, then the output file first column has the following repeated (ARRAY(0x141ecf8) ARRAY(0x141edd0) ARRAY(0x141ee48)). There was nothing else in the other columns. 


#!/usr/bin/perl -w
use strict;
use warnings;
use Text::CSV_XS;

open (my $FILE1, '<', "inputfile1.csv") or die "cannot open file1 $!\n
+";
open (my $FILE2, '<', "inputfile2.csv") or die "cannot open file2 $!\n
+";
open (my $FILE3, '<', "inputfile3.csv") or die "cannot open file3 $!\n
+";

open (my $FILE4, '>', "Outputfile.csv") or die "cannot open file4 $!\n
+";

my $csv = Text::CSV_XS->new ({ binary => 1, eol => $/ , 
                               sep_char => "\t", always_quote =>1});

my @columnheadings=split(/\t/,<$FILE1>);
<$FILE2>;
<$FILE3>;
push (@columnheadings,('InFCDAC','InFCTriple'));
      my $headings=join("\t",@columnheadings);
print $FILE4 "$headings\n";



my %file2;


while (my $row = $csv->getline($FILE2)) 
{
   # chomp $row;
    my @fields = @$row;
    my $id = $fields[0];
    $file2{$id}=["",@fields];
    #print "$id\n";
}
my %file3;
while (my $row = $csv->getline($FILE3)) 
{
   # chomp $row;
    my @fields = @$row;
    my $id = $fields[0];
    $file3{$id}=["",@fields];
    #print "$id\n";
}

while (my $row=$csv->getline($FILE1))
{
   
    my @fields=@$row;
    my $id=$fields[0];
      if (exists $file2{$id})
    {
    if(exists $file3{$id})
    {
        
     my $fields_ref=\@fields;
     
     my @fields2=$file2{$id}[5];
          
       my @fields3=$file3{$id}[5];
     
       my @printline=$fields_ref."\t".\@fields2."\t".\@fields3;
    
    $csv->print ($FILE4,\@printline);
     }
    else
    {
    }
    }
    else
    {
    }
}

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In reply to Expected fields to be an array ref by bluray

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