GNU APL

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GNU APL is an implementation of APL. Other implementations of APL.

GNU APL is a cross platform APL interpreter.

The APL interpreter is an (almost) complete implementation of ISO standard 13751 aka. Programming Language APL, Extended.

The APL interpreter has implemented:

- nested arrays and related functions

- complex numbers, and

- a shared variable interface

In general, it follows IBM's APL2 implementation. For a wonderful introduction to APL2, refer to APL2 At A Glance, by Brown, Pakin & Polivka.

Note that Dyalog APL is a proprietary implementation that is actively developed by its namesake company, and as such has diverged from APL2 in some respects. Many online examples use Dyalog operators and syntax extensions; to understand the differences refer to this discussion of APL "evolution" or "migration" levels and how they affect the meaning of certain operators: Mix (up arrow) in GNU APL?

With some basic knowledge of APL2 and Dyalog, programs can be translated from one to the other with minimal effort.