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#!/usr/bin/perl
# Produces a graph of random numbers from an Erlang distribution.
# Usage: erlang.pl [ORDER [COUNT]]
# ORDER defaults to 3
# COUNT defaults to 1 million
use strict;
use warnings;
$| = 1;
use Math::Random::MT::Auto qw(erlang);
MAIN:
{
my $order = (@ARGV) ? $ARGV[0] : 3;
my $count = (@ARGV > 1) ? $ARGV[1] : 1000000;
my %erlang;
# Get random numbers and put them in bins
print("Generating $count Erlang random numbers. Please wait...");
for (1 .. $count) {
my $x = int(erlang($order, 40/($order+2)));
# Make sure the tail doesn't overflow
if ($x > 80) {
$x = 80;
}
$erlang{$x}++;
}
# Find the max bin size for scaling the output
my $max = 0;
while (my $key = each(%erlang)) {
if ($max < $erlang{$key}) {
$max = $erlang{$key};
}
}
# Output the graph
print("\n");
for my $key (sort { $a <=> $b } (keys(%erlang))) {
my $len = int(79.0 * $erlang{$key}/$max);
print(':', '*' x $len, "\n");
}
}
exit(0);
# EOF
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