The workshops are underway at Dyalog ’26! Attendees are getting hands-on with Dyalog, sharing ideas and putting new techniques into practice. #Dyalog26 #Dyalog #APL #ArrayProgramming #Programming #TechConference

#APLQuest 2018-03: Write a function that, given an integer scalar or vector representing the number of sides on each of a set of dice, will return a histogram showing the distribution curve for the possible totals that can be rolled using those dice apl.quest/2018/3/ #APL #DiceProbability

APL Quest 2018-3: Rolling Along

Write a function that, given an integer scalar or vector representing the number of sides on each of a set of dice, will return a histogram showing the distribution curve for the possible totals that ...

apl.quest

Learn APL and compete for one of three $100 prizes! There's one month left to enter the 2026.3 round of the APL Challenge. See challenge.dyalog.com for more information and to enter #aplchallenge #apl #dyalog #learnapl

#APLQuest 2018-02: Write a function that, given a scalar real non-negative number, will return a two-element vector of the integer and fractional parts of the number (see apl.quest/2018/2/ to test your solution and view ours). #APL #IntegerFractional #NumberDecomposition

APL Quest 2018-2: Number Splitting

Write a function that, given a scalar real non-negative number, will return a two-element vector of the integer and fractional parts of the number.

apl.quest

The full programme for Dyalog '26 is now available. For more information and to register, see usermeeting.dyalog.com #dyalog26 #apl #dyalog

#APLQuest 2018-01: Write a function that, given a scalar or vector of skyscraper heights from closest to furthest, will return an integer representing the number of skyscrapers that can be seen (see apl.quest/2018/1/ to test your solution and view ours). #APL #SkylineProblem #RunningMaximum

APL Quest 2018-1: Oh Say Can You See?

Write a function that, given a scalar or vector of skyscraper heights from closest to furthest, will return an integer representing the number of skyscrapers that can be seen.

apl.quest

Registration for Dyalog '26 closes next Friday (25 September) – don't miss this opportunity to exchange experiences with other APL users, and update your technical knowledge with product training and workshops. For more information and to register, see usermeeting.dyalog.com #dyalog26 #apl #dyalog

Today marks 35 years since John Daintree joined Dyalog Ltd! A lot has changed in that time...see page 40 onwards of www.dyalog.com/uploads/docu... for a glimpse into John's life developing Dyalog in "the late 1900s"...Congratulations John! #Dyalog #DyalogAPL

Our latest blog post – www.dyalog.com/blog/2026/09... – is the second in a series in which Adám shares some of the IDE customisations that he has collected in his years using Dyalog. #Dyalog #APL #IDE

#APLQuest 2017-10: Write a function that will reshape a given array into the smallest square matrix that will contain all the elements of the argument, padding with additional elements if necessary (see apl.quest/2017/10/ to test your solution and view ours). #APL #SquareMatrix #ArrayReshaping

APL Quest 2017-10: Squaring Off

Write a function that will reshape a given array into the smallest square matrix that will contain all the elements of the argument, padding with additional elements if necessary.

apl.quest

#APLQuest 2017-09: Write a function that takes a character vector or scalar and returns a Boolean vector indicating anywhere an element is followed by an element of the same value (see apl.quest/2017/9/ to test your solution and view ours). #APL #DuplicateDetection #AdjacentComparison

APL Quest 2017-9: Double Trouble

Write a function that takes a character vector or scalar and returns a Boolean vector indicating anywhere an element is followed by an element of the same value.

apl.quest

Last few days to register for Dyalog '26 with guaranteed accommodation at the venue! If you're planning to join us but haven't registered yet, make sure you do so by 4 September. After that, we can't guarantee a room at The View Hotel. See usermeeting.dyalog.com #dyalog26 #apl #dyalog

#APLQuest 2017-08: Write a function that takes a Boolean vector or scalar and “turns off” all the 1s after the first 1 (see apl.quest/2017/8/ to test your solution and view ours). #APL #BooleanVectors #FirstOccurrence

APL Quest 2017-8: Be the First 1

Write a function that takes a Boolean vector or scalar and “turns off” all the 1s after the first 1.

apl.quest

If you are intending to join us for Dyalog '26 (and we do hope that you are!) but have not yet registered, you will need to do so before Friday 4 September for guaranteed accommodation at the venue. For more information and to register, see usermeeting.dyalog.com #dyalog26 #apl #dyalog

We’re adding details of the presentations at Dyalog ’26 to the user meeting website, with more to come. Join us for a week of presentations, workshops, and community building. More information and registration: usermeeting.dyalog.com #Dyalog26 #APL #Dyalog

Congratulations Steve Allen, Amado Cabrera Estrada, and Rohan Prinja, winners of the 2026.2 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

#APLQuest 2017-07: Write a function that takes a character vector representing a DNA string and returns 4 integers of the number of occurrences for each of the symbols 'A', 'C', 'G', and 'T' respectively (see apl.quest/2017/7/). #APL #DNASequencing #FrequencyCounting

APL Quest 2017-7: Counting DNA Nucleotides

Write a function that takes a character vector representing a DNA string and returns 4 integers of the number of occurrences for each of the symbols 'A', 'C', 'G', and 'T' respectively.

apl.quest

In our latest blog post – www.dyalog.com/blog/2026/08... – Brian examines the impact of hash tables when performing searches. #Dyalog #APL #performance

#APLQuest 2017-06: Write a function that takes a character vector as its right argument and k (the substring length) as its left argument and returns a vector of the k-mers of the original string (see apl.quest/2017/6/ to test your solution and view ours). #APL #DNA #Bioinformatics

APL Quest 2017-6: k-mers

Write a function that takes a character vector as its right argument and k (the substring length) as its left argument and returns a vector of the k-mers of the original string.

apl.quest

#APLQuest 2017-05: Write a function that takes a string representing a nucleotide and returns a `1` if it is a valid DNA string, `0` otherwise (see apl.quest/2017/5/ to test your solution and view ours). #APL #DNA #StringValidation

APL Quest 2017-5: DNA?

Write a function that takes a string representing a nucleotide and returns a `1` if it is a valid DNA string, `0` otherwise.

apl.quest

Our latest blog post is the next in our #EmployeeSpotlight series, which celebrates members of the team. Martin has reached his first year anniversary with Dyalog Ltd, and www.dyalog.com/blog/2026/08... looks at how he's found his first twelve months. #TeamDyalog #Dyalog

ArrayCast is starting shortly: www.youtube.com/watch?v=-Epr...

Episode 129

YouTube video by ArrayCast

youtube.com

The winners of the 2026 APL Forge have been announced. Kyle Croarkin (APL category) Conor Hoekstra (Non-APL category) Meet them and find out more about their winning entries at www.dyalog.com/news/166/420... #APLForge #Dyalog #APL #ArrayProgramming #ProgrammingCompetition #SoftwareDevelopment

The 2026.3 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

#APLQuest 2017-04: Write a function that calculates and returns the areas of 0 or more pie slices (see apl.quest/2017/4/ to test your solution and view ours). #APL #Geometry #AreaCalculation

APL Quest 2017-4: Slice(s) of Pie(s)

Write a function that calculates and returns the areas of 0 or more pie slices.

apl.quest

Learn APL and compete for one of three $100 prizes! Don't forget to submit your solutions for the 2026.2 round of the APL Challenge – the deadline is tomorrow (31 July) at 08:00 UTC. See challenge.dyalog.com for more information and to enter. #aplchallenge #apl #dyalog #learnapl

Dyalog '26 10% early bird discount ends on Friday! Join us in Eastbourne, 12–16 October, for #APL presentations, workshops, training and discussions with the Dyalog community. Register: usermeeting.dyalog.com #dyalog26 #dyalog

Manas Mahale, a member of the APL community, has written a blog post about implementing Extended Connectivity Fingerprints (ECFP) in Dyalog APL. Read about this #cheminformatics exploration at butwhyisthat.substack.com/p/ecfp #Dyalog #APL

Extended Connectivity Fingerprint in APL

a lesson in writing unmaintainable scientific code

butwhyisthat.substack.com

Last chance to save 10% on your Dyalog ’26 registration – it expires on Friday (31 July). Join us in Eastbourne, 12–16 October, for #APL presentations, workshops, training and discussions with the Dyalog community. Register by 31 July: usermeeting.dyalog.com #Dyalog26 #Dyalog

#APLQuest 2017-03: Write a function that will remove text found between pairs of double quotes (see apl.quest/2017/3/ to test your solution and view ours). #APL #StringManipulation #QuoteRemoval

APL Quest 2017-3: Miss Quoted

Write a function that will remove text found between pairs of double quotes.

apl.quest