Dyalog ’23 Videos: Week 4 – Research and Education
I am always thrilled to hear from people who have been able to use APL to gain insight into difficult subjects, or use APL to pass knowledge on to others. A truly fascinating and surprising example of this at Dyalog ’23 was the talk titled “quAPL – A Quantum Computing Library in APL”, in which […]
Dyalog ’23 Videos: Week 3 – Dyalog Core Development
This week’s collection consists of presentations by members of the development team, and concentrates on language features and development tools that the developers are currently designing or already implementing. Many of these features are likely to be in version 20.0 of Dyalog, which we plan to release in early 2025, about a year after version […]
Dyalog ’23 Videos: Week 2 – APL Problem Solving Competition
The section that is dedicated to the annual APL Problem Solving Competition is always one of my own favourite parts of a Dyalog user meeting, and the talks by the two winners this year were no exception. It is always a treat to hear about how the student winners are able to go from zero […]
Welcome to the Dyalog ’23 Videos!
Welcome to the 2023 edition of the Dyalog user meeting presentation recordings. This year, we plan to release a few talks each week until the Winter Solstice – and I will be doing my best to introduce each block of related talks. Week 1 – A New CEO! For the 19th year running, the annual […]
Formal Proposal for APL Array Notation – Seeking Feedback
One of the defining features of the APL language is the ability to denote numeric vectors directly through juxtaposition — separating the elements by spaces, as in 0 1 1 2 3 5 8. The notation for character “vectors” is similar to that for “strings” in most other languages, using quotes to denote the start […]
11 April 2023 – A Day to Celebrate!
Today we reach two very significant milestones. 40 Years of Dyalog APL On this day, we have cause for celebration: it is 40 years since the release of Dyalog version 1.0! Geoff Streeter would say that from his perspective we are already in the 42nd year, as he and John Scholes started work on the […]
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 defined as identity functions on scalar arguments. Dyalog v19.0 extends the definitions to provide equivalent reflections on scalars. Character Data We expect that the new transformations will be most useful on characters. For example: (⍉’A’)(⌽’P’)(⊖’L’) […]
Structural vs. Mathematical “Under”
The APL Farm has recently hosted discussions about the proposed under operator, asking “why Dyalog hasn’t implemented it a long time ago”. I claimed that an important reason was that Roger Hui wasn’t a big fan of the proposed extension known as “structural under”. Stefan Kruger then asked me why that was so. Since Roger […]
The 2021 APL Problem Solving Competition: Phase I – Best of Breed
By: Stefan Kruger Stefan works for IBM making databases. He tries to learn at least one new programming language a year, and a few years ago he got hooked on APL and participated in the competition. This is his perspective on some solutions that the judges picked out – call it the “Judges’ Pick”, if […]
Announcing the Beta Programme for Dyalog APL Version 18.2
I am very pleased to be able to announce the start of the Beta testing of the next release of Dyalog APL! As explained in June, we decided to delay the release of version 18.1 in order to take a closer look at some of the optimisations that had been implemented in 18.0 (and were […]
