GNU APL

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GNU APL is a cross platform APL interpreter.

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

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.