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Recreational

Advent of Code 2025 – Day 1 in APL

Advent of Code is an annual challenge in which a new programming puzzle is released every day for the first 12 days of December. We always see some great… Read

December 2025

Asher Harvey-Smith

Announcing Dyalog v19.4.1

Although the core language primitives (also known as squiggles) are closest to our hearts, we spend a lot of time creating interfaces to external components… Read

April 2025

Dyalog Ltd

Numeric Case Conversion

Dyalog version 18.0, released in June 2020, introduced the Case Convert system function ⎕C. It was a replacement for the long-lived (since version 15.0, from… Read

April 2024

Adám Brudzewsky

Extending Structural Functions to Scalars

Traditionally, the set of monadic reversing or reflecting primitives, Reverse-First (⊖), Transpose (⍉), and Reverse (⌽) apply to entire arrays and are… Read

April 2023

Morten Kromberg

Dyalog Version 18.4.1

During the recent APL Seeds ’22 meeting, it was suggested that we introduce keywords that could be used as an alternative to APL symbols. Several… Read

April 2022

Adám Brudzewsky

Speed versus Accuracy: the User’s Choice

At Dyalog we have long striven for both correctness and high performance in our implementation. However, our views on this matter have recently undergone an… Read

April 2019

Marshall Lochbaum

Permuting Internal Letters

Friday Afternoon It’s something of a custom in Dyalog to send a “fun” e-mail to the group on Friday afternoons. My gambit for this past… Read

January 2018

Roger Hui

Krypto

In the 2016 Year Game, the task was to generate the numbers 0 to 100 using APL primitives and the digits 2 0 1 6 in that order. For example, 20=16 ×2016… Read

May 2017

Roger Hui

Beauty and the Beast

Finally, the last accessory I ordered for my Raspberry Pi Zero (that’s the little red thing behind my keyboard) has arrived – an Acer 43″… Read

March 2017

Morten Kromberg

The 2016 Year Game

Our 2016 Year Game was launched in January 2016 and ran until the end of the year. The idea was simple – to find APL expressions involving exactly the digits… Read

January 2017

Fiona Smith

It’s APL…but not as we know it!

by the Dyalog Duck As the party behind Dyalog’s Twitter account I often search our feed for #APL or just APL to see if anyone is talking about us or APL… Read

July 2016

guestBlogger

APL Puns

In the Beginning ⌊ floor ⌈ ceiling ⍟ log ⌊ and ⌈ were punnish when the notation was introduced in 1962. They have long since gone mainstream, used… Read

December 2015

Roger Hui

Simply A-maze-ing

One of many things I like about APL is that it’s fun to use for recreational computing. I will frequently happen upon an interesting problem, puzzle, or… Read

March 2015

Brian Becker