Don't work an array

< ^ > P N |<>|^_>< --- | ~ ...Help

Hello, this don't work on ruby 1.9.2. What's matter?

$a = Array.new
for i in 1..5
  for j in 1..8
    $a[i][j] = i*j
  end
end

-- 
Posted via http://www.ruby-forum.com/.