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The British APL Association (BAA; infrequently BAPLA) is a user group founded in 1984 in England to promote APL, and the publisher of Vector journal. It is funded by its sustaining members, which include corporate users and the APL vendors APL2000, Dyalog Ltd., Kx Systems, and MicroAPL.

The BAA was a Specialist Group of the British Computer Society from its early years (possibly beginning after APL86[1]) until it left in response to increasing requirements made by the BCS in 2008.[2]



From 2008 and until the onset of the COVID-19 pandemic, the BAA London group arranged a monthly open-for-all meet-up, called the symposium, at the The Hoop and Grapes pub on Farringdon Street in London. No sign-up was required.

Vector journal

Vector, the journal of the BAA, began publication in 1984, and gradually took the place of APL Quote Quad as the de-facto leading publishing channel for APL content. The journal featured submitted articles on array programming including J and K, as well as news from APL and other array language vendors. Beginning in 2005, with volume 21 issue 4, the journal was issued online as well as in print, and some prior articles have also been made available online.[3] It was published quarterly until 2004, when late and sometimes skipped issues began to interrupt its formerly regular schedule. Releases slowed more significantly after 2008, and in 2016, following the completion of volume 26, the journal moved entirely to online publishing. So far a single issue has been published this way, in 2019.


The British APL Association held a 2-day conference, BAPLA 09, on June 8th & 9th 2009 at DeVere Hotel, Wokefield Park, near Reading, UK


In response to the restrictions imposed during 2020 by the COVID-19 pandemic, BAA has arranged a series of webcasts to replace their regular monthly symposium.[4] The series proved popular, and was continued into 2021.[5]

The Webinars, are held using Zoom, and consist of half an hour of social interaction, followed by a single presentation of about an hour, and a Q&A session. The sessions are recorded with subsequent publication on YouTube. Some webinars are so called open sessions which are more similar to the monthly symposium, in being informal meetings where APLers discuss and present whatever they feel like, with no particular subject decided on beforehand.


No. Date Presenter(s) Title
1 Apr 9th 2020 Richard Park, Dyalog Molecular Dynamics-in-APL
2 Apr 23rd 2020 MJH Software Services Introducing qWC Alpha 0.4
3 May 7th 2020 Adám Brudzewsky, Dyalog Meet the new APL Wiki
4 May 21st 2020 Phil Last Acre source-code manager update
5 Jun 4th 2020 Paul Grosvenor British APL Association AGM
6 Jun 18th 2020 Bob Armstrong CoSy : The Shortest Path from the Chip to the Math
7 Jul 2nd 2020 Adám Brudzewsky turns 1
summer break
8 Aug 13th 2020 John Jacob BAA websites: New features
Ellis Morgan An APL recreation
9 Aug 27th 2020 Open Session
10 Sep 10th 2020 Open session
11 Sep 24th 2020 Ray Cannon Using SVG from Dyalog APL for animated visualisation
12 Oct 8th 2020 Ray Polivka Seats in the House of Representatives
13 Oct 22nd 2020 Open Session
14 Nov 5th 2020 Open session
15 Nov 19th 2020 Open session
16 Dec 3th 2020 Open session
17 Dec 17th 2020 Stephen Taylor Iverson Centenary


No. Date Presenter(s) Title
18 Jan 14th 2021 Open session
19 Jan 28th 2021 Open session
20 Feb 11th 2021 Open session
21 Feb 25th 2021 Open session
22 Mar 11th 2021 Open session
23 Mar 25th 2021 Conor Hoekstra Algorithms as a tool of thought
Log-On Software APL2 update
24 Apr 8th 2021 Open session
25 Apr 22nd 2021 Open session
26 May 6th 2021 Open session
27 May 20th 2021 Martin Neitzel The J Workbench
28 Jun 3rd 2021 Open session
29 Jun 17th 2021 Open session
30 Jul 1st 2021 Paul Grosvenor British APL Association AGM
32 Jul 15th 2021 Open session
33 Jul 29nd Open session
34 Aug 12th Paul Grosvenor EGM to ratify changes to BAA regulations
35 Aug 26th Open session
36 Sep 9th Open session
37 Sep 23th Open session
38 Oct 7th Open session
39 Oct 21st Open session
40 Nov 4th Open session
41 Nov 18th Open session
42 Dec 2nd Open session
43 Dec 16th Open session


The BAA is administered by a committee of officers elected by ballot of Association members at the Annual General Meeting. Working groups are also established in areas such as activity planning and journal production. Offers of assistance and involvement with any Association matters are always welcomed.

Funding for the BAA comes entirely from the sustaining members. In many cases, these sustaining members also provide manpower and administrative assistance to the association at their own cost.

The current chairman is Paul Grosvenor.

External links

  • The Vector archives are significant and relevant for understanding APL and related languages today


  1. Anthony Camacho. "BAA Annual General Meeting 2010". Vector journal volume 24 issue 4. 2010-12.
  2. Paul Grosvenor. "Changes at the BAA" (pdf). Vector journal volume 23 issue 4. 2008-09.
  3. Stephen Taylor. "Editorial: Discover, Learn, Profit". Vector journal volume 21 issue 4. 2005-09.
  4. BAA. Webinar Schedule for 2020.
  5. BAA. Webinar Schedule for 2021.
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