Here's a crackpot semantic theory: in their context "code" is not a continuous, uncountable bulk of text to be manipulated or examined. A "code" is a self-conta

Here's a crackpot semantic theory: in their context "code" is not a continuous, uncountable bulk of text to be manipulated or examined. A "code" is a self-contained program, a discrete object which is created, distributed, and used as a tool. (Maybe decoupling and modularity is not common in numerical analysis? I don't know) So it doesn't make sense in that field to use "code" as an uncountable noun, any more than someone in 1990 would call a set of individual workstation PCs "compute" instead of "some computers".