PerlMonks: Thanks for all the help.

I have another question. I am trying to merge a given column from individual lfiles to a single text file. This is how the files look like:

input1

freq   data1

1     2

2     5

3     10

input2

freq   data2

1     12

2     50

3     10

input3

freq     data3

1     10

2     25

3     11

Combined output

freq   data1   data2   data3

1   2   12   10

2   5   50   25

3   10   10   11

I have difficulty writing to a certain column in output

following code attempts to take second column from input file and writes to second column in output file, but not successful.

use strict;
use warnings;

open(my $file2, '<', "data1.txt") or die "failed to open 'output_1.txt
+ $!";         
open(my $file3, '>>', "combined.txt") or die "failed to open 'combined
+.txt $!";  
while (<$file2>)
{
    chomp;   # delete new line character
    my @combined_data = $file3;
    my @list_file = split;
    print "$combined_data[1]"  "$list_file[1]\n";
}
close $file2;
close $file3;

[download]

In reply to Merging Columns from multiple files into a single file by ikhan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.