Think in the following order,

#!/usr/bin/perl -w
use strict;
 
my %file1hash;

my ($fin1, $fin2) = qw|alpha.dat beta.dat|;

open (DAT1,"$fin1");

while(my $line=<DAT1>) {
    chomp($line);
        next if $line=~m/^id/;
    my ($id,$x1,$x2)=split(' ' ,$line);
    push @{$file1hash{$id}}, "$x1 $x2";
}

close DAT1;

open (DAT2,"$fin2");
while (my $line=<DAT2>) {
    chomp($line);
        next if $line=~m/^id/;
    my ($id,$word)=split(' ', $line);
        if (exists $file1hash{$id}) {
        for my $x (@{$file1hash{$id}}){
                print qq|$id\t$x\t$word\n|;
        }
    }
}
close DAT2;

[download]

Makes..

A    12 45    hello
A    10 12    hello
A    15 74    hello
B    23 15    goodbye
D    19 10    happy
D    11 12    happy
E    14 5    black
E    34 31    black
C    11 41    blue
C    18 12    blue

[download]

Analysis: Your code was creating a hash with simple elements when what you really wanted was a hash of array references (incorrect choice of data structure). When you have > 1 element you can iterate over them and get them all.

Celebrate Intellectual Diversity

In reply to Re: Merging two data sets by InfiniteSilence
in thread Merging two data sets by sonicbill11

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.