$0 = 1
$10 = H * W
while($0 <= $10)
    $31 = (($0 - 1) / W) + 1
    $32 = (($0 - 1) % W) + 1
    $11 = $11 + A[$31,$32]
    $12 = $12 + B[$31,$32]
    $21 = $21 + (A[$31,$32] * $0)
    $22 = $22 + (B[$31,$32] * $0)
    $0 = $0 + 1
end

$41 = $12 - $11
$42 = $22 - $21
$43 = $42 / $41

$91 = ($43 / W) + 1
$92 = ($43 % W) + 1

return($91, $92)