it's a fairly common usage in numeric computing. If you read, for example, the wikipedia entries for "computational fluid dynamics" you'll see that they consis

it's a fairly common usage in numeric computing. If you read, for example, the wikipedia entries for "computational fluid dynamics" you'll see that they consistently speak of "codes" when referring to programs. https://en.wikipedia.org/wiki/Computational_fluid_dynamics https://en.wikipedia.org/wiki/Computational_fluid_dynamics