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APL ∊ BCN logo.

APL ∊ BCN is a user group based in Barcelona started by Michail Liarmakopoulos in late November 2021. Its activities are currently exclusively online due to the continuing impact of the COVID-19 pandemic, but plans exist for transitioning to regular physical meetups in Barcelona every second month, with additional online events every one–three months.

It is the first user group based in a country where Spanish is the majority language, but meetings will be held in English to be as accessible as possible.


The group was founded with the goals of:

  • spreading knowledge of APL and the array family of programming languages.
  • spreading knowledge about Ken Iverson and other people involved in the development of APL.
  • sharing knowledge related to the intersection of mathematics and programming.
  • fostering a friendly community of people interested in array programming.


  • The group organizes two distinct types of meetings: general meetings and historical APL paper reading meetings.
  • Discussions take place in IRC (LiberaChat server), #apl_in_bcn.

General meetings

Date Time Title Subject Meeting link Video Slides Code
2021-12-18 19:00–20:30 CET APL: A different Programming Language How to keep calm and not be afraid of the glyphs, monadic and dyadic functions, operators, function axis Zoom: 758 323 8770 01:42:01 PDF N/A
2022-01-29 19:00-20:30 CET J: A modern math-oriented APL An introduction to J for the mathematically curious. Zoom: 865 2867 0782 01:19:28 PDF Code

Historical APL paper reading group

Date Time Title Subject Meeting link Video Slides Code
2022-04-09 19:00-20:30 CEST APL ∊ BCN - meet #3 "Is APL epidemic? or a study of its growth through an extended bibliography", J.C. Rault, G. Demars, APL '72 Zoom: 847 7983 4648 01:00:22 Markdown N/A
2022-09-17 19:00-20:30 CEST APL ∊ BCN - meet #4 "Notation as a Tool of Thought", K. E. Iverson, (Part I: ch0, ch1) Zoom: 829 3273 0751 01:02:10 Markdown N/A
2023-07-?? Prerecorded APL ∊ BCN - meet #5 "Notation as a Tool of Thought", K. E. Iverson, (Part II: ch2) NA TBD TBD N/A
2023-09-?? Prerecorded APL ∊ BCN - meet #6 "Notation as a Tool of Thought", K. E. Iverson, (Part III: ch3, ch4a) NA TBD TBD N/A
2023-11-?? Prerecorded APL ∊ BCN - meet #7 "Notation as a Tool of Thought", K. E. Iverson, (Part IV: ch4b, ch5) TBD TBD TBD N/A

External links

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