Further Reading

Foundational texts

• Ken Iverson. A Dictionary of APL. APL Quote Quad 18(1), September 1987. Online. The theoretical foundation for MARPLE's design.
• Ken Iverson. Rationalized APL. IPSA, 1983. Introduces rank and the leading-axis approach.
• Robert Bernecky. "An Introduction to Function Rank." APL88 conference proceedings, 1988. The best introduction to why rank matters.
• Ken Iverson. Notation as a Tool of Thought. Communications of the ACM, 1980. Online. The Turing Award lecture that set out the case for array notation.

The rank operator

• Arthur Whitney. Compact Hash Tables and early rank work at I.P. Sharp Associates, 1982.
• Roger Hui and Ken Iverson. J Introduction and Dictionary. Online. Rank is central to J's design.
• Rodrigo Girao Serrao. RGSPL blog posts on implementing rank in Python.

Learning APL

• APL Wiki: https://aplwiki.com -- comprehensive reference for all APL dialects
• Stefan Kruger. Learning APL: https://xpqz.github.io/learnapl/ -- modern tutorial using Dyalog
• Dyalog APL course: https://course.dyalog.com -- interactive lessons
• APL Orchard chat: https://apl.chat -- community chat room

Related projects

• RGSPL: https://github.com/rodrigogiraoserrao/RGSPL -- another Python APL, a design reference for MARPLE
• J Software: https://www.jsoftware.com -- the language most closely related to MARPLE's design philosophy
• Dyalog APL: https://www.dyalog.com -- the most widely used commercial APL
• GNU APL: https://www.gnu.org/software/apl/ -- free Software Foundation APL implementation

Standards

• ISO 8485:1989 -- the flat APL standard that MARPLE's core follows

NumPy and array programming

• NumPy documentation: https://numpy.org/doc/ -- the backend MARPLE uses for acceleration
• ulab documentation: https://micropython-ulab.readthedocs.io/ -- the MicroPython/CircuitPython array library