HOPL

From APL Wiki
Jump to navigation Jump to search

The History of Programming Languages conference is held by SIGPLAN to discuss and record the history of programming language development. It is notable to APL historians because of the very detailed papers presented at the 1978 and 2020 conferences. ACM SIGPLAN is the Special Interest Group on Programming Languages; while SIGAPL is a chapter of SIGPLAN, it is not directly associated with HOPL.

To date, there have been four HOPL conferences: they are held infrequently, but with increasing frequency. The first, in 1978, featured a presentation by Ken Iverson and Adin Falkoff on APL.[1] The fourth conference, in 2020, features an APL presentation again, this time by Roger Hui and Morten Kromberg.[2]

Conference years appear to be given by the expression:

      1962++\⌽⍳16
1978 1993 2007 2020 2032 2043 2053 2062 2070 2077 2083 2088 2092 2095 2097 2098
One of HOPL IV's conference badges

HOPL IV conference badge

One of the conference badges for HOPL IV features an APL expression or ÷+/÷(E0)/E which computes multiple aspects of electrical circuits:

÷ +/ ÷ (E0) / E

E is a vector of real numeric values
(E0) produces a Boolean mask indicating which components have a non-zero value
(E0) / E uses the mask to filter the components, thus removing the zeros
÷ finds the reciprocal of those
+/ sums them up
÷ computes the reciprocal of that

The equivalent mathematical formula would be quite involved:

External links

References

  1. Adin Falkoff, and Ken Iverson. The Evolution of APL (web). ACM SIGPLAN Notices, Volume 13, Number 8. 1978-08.
  2. Roger Hui and Morten Kromberg. APL since 1978. ACM HOPL IV. 2020-06.
APL community [edit]
Conferences and activities Advent of CodeAPL CampfireAPL CultivationAPL Meetup (Portuguese) ∙ APL Problem Solving CompetitionAPL QuestAPL SeedsArray CastBAA sessionsCode golfDyalog user meetingsDyalog webinarsIverson AwardSharing code
Chat rooms and forums APL FarmAPL Orchard
User groups APL Borealis (Canada) ∙ APL et J (France) ∙ APL Germany (terminology) ∙ APL ∊ BCN (Spain) ∙ BAA (UK) ∙ FinnAPL (Finland) ∙ JAPLA (Japan) ∙ SAUG (Switzerland) ∙ SIGAPL (USA) ∙ SwedAPL (Sweden) ∙ Tokyo APL/J/K Meetup (Japan)
People Phil AbramsBrian BeckerBob BerneckyLarry BreedCharles BrennerJim BrownAdám BrudzewskyGitte ChristensenPeter DonnellyJohn EarnestAdin FalkoffGarth FosterLib GibsonAaron HsuRoger HuiKen IversonMorten KrombergMarshall LochbaumEugene McDonnellJon McGrewDonald McIntyreRoger MooreAlan PerlisHenry RichAl RoseWilliam RutiserJohn ScholesIan SharpBob SmithGeoff StreeterRoy SykesArthur Whitney
Other APL Quote QuadAPL WikiBlogsBooksFamous APL usersHumourJobsMerchandisePapersTryAPLTry It OnlineVideo channels