"Dyalog" refers to the APL implementation developed and distributed by British company Dyalog Ltd. Dyalog APL includes many additions over the ISO standard for APL. This tag should be used in addition to [apl] when asking for help with language features specific to Dyalog APL, or when a solution using such features is acceptable.
Dyalog APL, or simply Dyalog, is a nested APL by British company Dyalog Ltd. The name Dyalog is a portmanteau of Dyadic and Zilog since it was initially released for the Zilog Z8000 processor in 1983. Continuously developed since, Dyalog has added numerous core language features, and support for many programming paradigms including object-oriented programming based on .NET, Lisp-style lexically scoped anonymous functions (dfns), and leading axis and tacit programming support based on J. It supports several platforms and interoperability between them, and interfaces with other languages and runtimes including native shared libraries, .NET, the JVM, R, and Python.
Example
This defines m as a 4-row, 3-column matrix consisting of the first 12 natural numbers:
m ← 4 3 ⍴ ⍳ 12
Now we can sum the columns:
+⌿ m
22 26 30
Counting the number of rows:
≢ m
3
Average of each column using an anonymous tacit function:
( +⌿ ÷ ≢ ) m
5.5 6.5 7.5
Tag usage
This tag should be used together with apl (in addition to more subject-specific tags) when asking about features limited to Dyalog APL and similar dialects, or when asking for code to complete a task, and a solution using Dyalog features is acceptable. Due to the rapid development of the language, it is beneficial to also include which version number is used, e.g. 17.1 or 18.0.
