An interesting article, but it annoys me when the author talks of analog computers having "an infinite level of resolution... because they use physical rather than digital inputs and outputs".<p>Physical machines have varying levels of tolerance, and this impacts the accuracy of calculations in just the same way as a truncated number in a digital system reduces accuracy.<p>It was a lot more interesting to read about the pros and cons of digital vs analog computers with respect to maintenance, reprogrammability, energy use, and reliability. It's a pity there wasn't a similarly in-depth account of the precision of each system.