In our latest blog post – www.dyalog.com/blog/2026/03... – Brian investigates the effect that data structure can have on performance and optimisation by revisiting a challenge from the 2019 APL Problem Solving Competition. #Dyalog #APL #ArrayProgramming #Performance

#APLQuest 2015-04: Write a function that implements progressive dyadic iota (see apl.quest/2015/4/ to test your solution and view ours). #APL #ArraySearching #IndexOf

#APLQuest 2015-03: Write a function that takes an integer right argument and returns a vector of the terms in the Farey sequence of that order (see apl.quest/2015/3/ to test your solution and view ours). #APL #FareySequence #NumberTheory

Registration is now open for DYNA26. This free, one-day, in-person event for existing and potential users of Dyalog will take place on Monday 27 April 2026 in New York City. Spaces are limited, so register now. See dyna.dyalog.com #dyna #dyalog #apl #ArrayProgramming #NYCTech

#APLQuest 2015-02: Write a function that takes a numeric vector and returns the length of the longest streak of positive growth (see apl.quest/2015/2/ to test your solution and view ours). #APL #SequenceAnalysis #Streaks

Learn APL and compete for one of three $100 prizes! There are two months month left to enter the 2026.1 round of the APL Challenge. See challenge.dyalog.com #aplchallenge #apl #dyalog #learnapl

#APLQuest 2015-01: Write a function that takes two character vectors as its left and right arguments and returns 1 if they are anagrams of each other (see apl.quest/2015/1/ to test your solution and view ours). #APL #Anagrams #WordPuzzles

Congratulations Thierry Dussuet, Olivia Weiss, and Nick Winterer, winners of the 2025.4 round of the APL Challenge (our quarterly event aimed at newcomers to APL)! See www.dyalog.com/apl-challeng... for more information. #aplchallenge #apl #dyalog #learnapl

The APL Forge has expanded! New category: submissions that enhance the APL experience without being written in APL - tools, plugins, apps, media and more. Win £2,500, a commercial licence and a trip to present at Dyalog '26. forge.dyalog.com #APL #APLForge

#APLQuest 2014-10: Write a function that returns the greatest percentage month-to-month increase. (see apl.quest/2014/10/ to test your solution and view ours). #APL #DataAnalysis #SalesData

The ArrayCast is back and now it's broadcast live! Join Conor Hoekstra, Adám Brudzewsky, and guests. The next episode, "FIXAPL with Jacob Lockwood", will take place on Monday 16 February at 15:00 UTC – see www.youtube.com/@arraycast/ #APL #ArrayProgramming #ArrayCast

Dyalog's Adám Brudzewsky participated in a discussion about APL on the 1x Developer Podcast (episode 43). The recording is now available to watch at www.youtube.com/watch?v=0_N_... or listen to at open.spotify.com/show/1eXZqdw... #Dyalog #APL #DevPodcast

The 2026.1 round of the APL Challenge is now open! This quarterly competition is open to everyone but is aimed at newcomers to APL – please spread the word to anyone who might be interested. For more information and to enter, see challenge.dyalog.com #aplchallenge #apl #dyalog #learnapl

Call all APLers! Code Golf code.golf supports unrestricted execution and checking for #APL (Dyalog APL). APL is currently listed as experimental. Submit solutions to help move it to the main language list and unlock a leaderboard. #Dyalog #DyalogAPL #CodeGolf

#APLQuest 2014-09: Write a function that calculates the distance (in metres) that a projectile travels, given an initial velocity (in metres per second) and a trajectory in degrees (see apl.quest/2014/9/ to test your solution and view ours). #APL #Physics #Mathematics

#APLQuest 2014-08: Write a function that returns the distance between two points in a space of any number of dimensions (see apl.quest/2014/8/ to test your solution and view ours). #APL #EuclideanDistance #VectorMath

#APLQuest 2014-07: Write a function that takes the diameters of the stationary and mobile circles and returns the number of revolutions the mobile must traverse until the tangent points meet again (see apl.quest/2014/7/ to test your solution and view ours). #APL #CircleGeometry #RotationalMotion

Learn APL and compete for one of three $100 prizes! There's only one week left to enter the 2025.4 round of the APL Challenge. See challenge.dyalog.com for more information and to enter. #APLChallenge #APL #Dyalog #LearnAPL

If you're in Toronto, on Monday 26 January and looking for something to do between 17:00 and 19:00, you could join an array programming meetup that Conor Hoekstra is hosting at Toronto Metropolitan University. Info: www.meetup.com/programming-...

#APLQuest 2014-06: Write a function that takes an integer vector representing the sides of a number of dice and returns a 2 column matrix of the number of ways each possible total of the dice can be rolled (see apl.quest/2014/6/ to test your solution and view ours). #APL #Probability #Combinatorics

In our latest blog post – www.dyalog.com/blog/2026/01... – Asher explores the performance implications of choosing a flat representation rather than a nested one for your data. #Dyalog #APL #ArrayProgramming

Adám joined Conor Hoekstra for a discussion about Dyalog v20.0, with particular emphasis on the addition of array notation and the new behind operator. Watch this episode of Tacit Talk at www.youtube.com/watch?v=0h4D... #Dyalog #APL #APLProgramming #ArrayNotation #BehindOperator

#APLQuest 2014-05: Write a function that returns a 1 if its character vector argument is a palindrome, 0 otherwise (see apl.quest/2014/5/ to test your solution and view ours). #APL #Palindrome #StringReversal

The final presentation recording from DYNA Fall 2025 is now available. Watch (or rewatch!) "Dyalog and AI" by Stefan Kruger, at www.youtube.com/watch?v=H_wd... #DYNA #Dyalog #AI #APL

On Monday 27 April 2026, Dyalog Ltd is hosting DYNA26 in New York City, New York. This free in-person event is for existing and potential users of Dyalog. For more information see dyna.dyalog.com #dyna #dyalog #apl

#APLQuest 2014-04: Write a function that removes extraneous (leading, trailing, and multiple) spaces from a character vector (see apl.quest/2014/4/ to test your solution and view ours). #APL #StringNormalization #WhitespaceHandling

Happy New Year from all of us at Dyalog Ltd! Here's to a FAB 2026, full of Fantastic Functions, Amazing Arrays, and Bug-free Builds! #Dyalog #APL #HappyNewYear

Learn APL and compete for one of three $100 prizes! There is one month left to enter the 2025.4 round of the APL Challenge. See challenge.dyalog.com for more information and to enter #aplchallenge #apl #dyalog #learnapl

Tacit Talk Episode 30 will livestream Jan 1 2026 at 12:00 (noon) PM EST 📅 I will chat with @abrudz.bsky.social about @dyalog.bsky.social 20.0 and the Behind operator ⍛ 🥳 www.youtube.com/live/0h4Dd-o...

New with Dyalog v20.0: Namespace manipulation and data extraction has been made easier with the addition of ⎕VGET and ⎕VSET, and extensions to ⎕NS. Discover more at www.youtube.com/watch?v=KR8v... #Dyalog #APL #DataExtraction #Namespaces

New with Dyalog v20.0: ⎕SHELL enables execution of external programs with more control and options than those provided by ⎕SH/⎕CMD. Discover more at www.youtube.com/watch?v=wEfS... #Dyalog #APL #APLProgramming

WOOOO! Now I feel obligated to learn APL properly!

Season's Greetings from all of us at Dyalog Ltd, and Merry Christmas to all those who celebrate it – we hope you have a peaceful and joyous day. #Christmas #Dyalog #APL #HolidaySeason

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) "What is the APL Trust?" by Diane Hymas, one of the founding directors of The APL Trust, www.youtube.com/watch?v=WT6_... #DYNA #Dyalog #APL #Education

#APLQuest 2014-01: Write a function that takes a character vector and removes the interior vowels from each word. (apl.quest/2014/2/ to test your solution) #APL #TextCompression #StringManipulation

It's great to see the new Dyalog v20.0 features generating such excitement! See www.youtube.com/watch?v=recw... for Conor Hoekstra's enthusiastic review of the new compositional operator behind ( ⍛ ). #Dyalog #APL #APLProgramming #BehindOperator

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) "ArrayLab: Building a 3D APL Game with raylibAPL" by Holden Hoover, a student at the University of Waterloo, at www.youtube.com/watch?v=N6Yx... #DYNA #Dyalog #APL #GameDevelopment

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) "What Can Vectorised Trees Do for You?" by Asher Harvey-Smith at www.youtube.com/watch?v=i6GC... #DYNA #Dyalog #APL #DataStructures

New with Dyalog v20.0: The two common patterns (f Y) g Y and (f X) g Y can now be represented by the new compositional operator behind ( ⍛ ). Discover more at www.youtube.com/watch?v=W6LF... #Dyalog #APL #APLProgramming #BehindOperator

Today we celebrate 105 years since the birth of Ken Iverson, creator of APL. Discover more about this visionary and Turing Award winner at en.wikipedia.org/wiki/Kenneth... #APL #ProgrammingLanguages #KennethIverson

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) "The Data Science Journey" by Josh David at www.youtube.com/watch?v=KGxW... #DYNA #Dyalog #APL #DataScience

#APLQuest 2014-01: Write a function that takes the length of the legs of a triangle as its left argument, and the length of the hypotenuse as its right, and returns 1 if the triangle is a right triangle, 0 otherwise (apl.quest/2014/1/ to test your solution) #APL #PythagoreanTheorem #Geometry

In our latest blog post – www.dyalog.com/blog/2025/12... – we look at keyboard shortcuts in the Dyalog IDEs, and explain ways in which you can reclaim use of the Ctrl key. #Dyalog #APL #DyalogAPL

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) "Dyalog APL: Our (Not So) Secret Ingredient" by Mark Wolfson, CTO of Buyers International Group, at www.youtube.com/watch?v=hnz6... #DYNA #Dyalog #APL #DataAnalytics

Team Dyalog will be attending today's BAA webinar (at 16:00 UTC) to discuss the recent Dyalog v20.0 release. If you have any questions on the new or enhanced functionality, we'll be happy to talk about them with you! How to join the webinar: britishaplassociation.org/webinar-sche... #Dyalog #APL

New with Dyalog v20.0: Expressions can now be evaluated primitive-by-primitive using inline tracing, while accessing arguments and results of each function along the way. Discover more at www.youtube.com/watch?v=UM-a... #Dyalog #APL #DeveloperTools #CodeTracing

Our latest blog post is Asher's review of the first problem in this year's #AdventOfCode. Discover how he gained access to Santa's North Pole base at www.dyalog.com/blog/2025/12... #Dyalog #APL

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) "Static Analysis of APL for Tooling and Compliance" by Aaron Hsu and Brandon Wilson at www.youtube.com/watch?v=d4pR... #DYNA #Dyalog #APL #StaticAnalysis #SoftwareDevelopment

#APLQuest 2013-10: Write a function that solves a set of linear equations (see apl.quest/2013/10/ to test your solution and view ours). #APL #LinearEquations #MatrixDivision

The presentation recordings from DYNA Fall 2025 are now being published. Watch (or rewatch!) An Interface to Kafka by Martina Crippa at www.youtube.com/watch?v=agpQ... #DYNA #Dyalog #Kafka #APL