A pretty fractal in Ruby

mandelbrot.rb

#!/usr/bin/env ruby

# adapted from Karl von Laudermann's one-liner version

require "complex"
w = 39
m = 2.0
w.times do |y|
  w.times do |x|
    c = Complex.new((m*x/w)-1.5,(2.0*y/w)-1.0)
    z = c
    e = false
    49.times do
      z = z*z+c
      if z.abs > m
        e = true
        break
      end
    end
    print(e ?"  ":"@@")
  end
  puts
end