I noticed two things: The data set "\@arrayofinterest" probably won't work the way that you think. Also, look back at the sample and look at the data set that the author gave. I tried the sample, and it worked fine. It prints the png to the home directory. Here's the sample:

#!/usr/bin/perl

use strict;
use warnings;
use GD::Graph::histogram;

my $data = [1,5,7,8,9,10,11,3,3,5,5,5,7,2,2];

my $graph = new GD::Graph::histogram(400,600);
$graph -> set(
x_label => 'Location',
y_label => 'Count',
title => 'Sample Histogram',
x_labels_vertical => 1,
bar_spacing => 0,
shadow_depth => 1,
shadowclr => 'dred',
transparent => 0,
)
or warn $graph->error;

my $gd = $graph->plot($data) or die $graph->error;
open (IMG, '>histo.png') or die $!;
binmode IMG;
print IMG $gd->png;
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