Fold and Other Functional Conjunctions
The Array Cast
The Different Flavors of Fold
This will be the fourth time appearing by Henry Rich. He's our resident Jay expert and does a ton of work on the Jay source code base which is where Jay comes from. We're going to be talking about all the different flavors of fold today so I'll stop talking and maybe just throw it over to him.
Array Cast - March 31, 2023
Show Notes
Thanks to Bob Therriault, Conor Hoekstra and Marshall Lochbaum for gathering these links:
[01] 00:01:45 Luther J. Woodrum Obituary https://www.fraryfuneralhome.com/obituaries/Luther--J.-Woodrum?obId=27482014#/celebrationWall
https://www.linkedin.com/in/luther-woodrum-b5775a4a?trk=public_profile_browsemap
Lenore Mullin Mathematics of Arrays https://www.linkedin.com/in/lenore-mullin-268b0a13
[02] 00:03:46 Episode 6 https://www.arraycast.com/episodes/episode-06-henry-richs-deep-dive-into-j
Episode 18 https://www.arraycast.com/episodes/episode18-henry-rich-presents-j903
Episode 48 https://www.arraycast.com/episodes/episode48-henry-rich
[03] 00:04:40 Command to run Fold using J Playground - install 'github:jsoftware/dev_fold'
J Fold https://code.jsoftware.com/wiki/Vocabulary/fcap
APL Reduce / https://aplwiki.com/wiki/Reduce
APL Scan \ https://aplwiki.com/wiki/Scan
J Scan /\ https://code.jsoftware.com/wiki/Vocabulary/bslash
https://code.jsoftware.com/wiki/Vocabulary/slash
J Grade /: or \: https://code.jsoftware.com/wiki/Vocabulary/slashco
[04] 00:10:02 Functional Programming Language https://en.wikipedia.org/wiki/Functional_programming
C Programming Language https://en.wikipedia.org/wiki/C_(programming_language)
[05] 00:12:30 Iverson Notation https://www.jsoftware.com/papers/APL.htm
Adjacent Difference C++ https://en.cppreference.com/w/cpp/algorithm/adjacent_difference
[06] 00:14:50 Haskell Programming Language https://en.wikipedia.org/wiki/Haskell
BQN Primitives https://mlochbaum.github.io/BQN/commentary/primitive.html
[07] 00:16:10 Object Oriented Programming https://en.wikipedia.org/wiki/Object-oriented_programming
[08] 00:17:12 J Power Conjunction u^:n https://code.jsoftware.com/wiki/Vocabulary/hatco
NARS 2000 APL https://aplwiki.com/wiki/NARS
J Rank Conjunction " https://code.jsoftware.com/wiki/Vocabulary/quote
J Cut Conjunction ;. https://code.jsoftware.com/wiki/Vocabulary/semidot
J Key Conjunction /. https://code.jsoftware.com/wiki/Vocabulary/slashdot#dyadic
J Recursion $: https://code.jsoftware.com/wiki/Vocabulary/dollarco
[09] 00:24:20 Identity Element https://aplwiki.com/wiki/Identity_element
[10] 00:37:09 J Terminate Z: https://code.jsoftware.com/wiki/Vocabulary/zcapco
J Cap [: https://code.jsoftware.com/wiki/Vocabulary/squarelfco
[11] 00:41:22 J throw. https://code.jsoftware.com/wiki/Vocabulary/throwdot
J catch. https://code.jsoftware.com/wiki/Vocabulary/trydot
[12] 00:45:21 J ^:v^:_ https://code.jsoftware.com/wiki/Vocabulary/hatco#DoWhile
J _3 Z: (Iterations bottom of page) https://code.jsoftware.com/wiki/Vocabulary/zcapco
[13] 00:53:05 BQN Fold https://mlochbaum.github.io/BQN/doc/fold.html
Table from J Fold to K https://code.jsoftware.com/wiki/User:Will_Gajate/FoldVariants
[14] 00:55:13 Arthur Whitney https://en.wikipedia.org/wiki/Arthur_Whitney_(computer_scientist)
APL Partition https://aplwiki.com/wiki/Partition
[15] 00:57:55 J Gerunds https://code.jsoftware.com/wiki/Vocabulary/Glossary#Gerund
[16] 00:59:20 J Rank-Gerund 901 Release Notes https://code.jsoftware.com/wiki/System/ReleaseNotes/J901
[17] 01:01:11 C++ 2019 7 Consecutive Ones Conor talk https://www.youtube.com/watch?v=48gV1SNm3WA
[18] 01:03:10 BQN Each https://mlochbaum.github.io/BQN/doc/map.html
[19] 01:05:25 Dyalog APL Split https://aplwiki.com/wiki/Split
APL2 https://aplwiki.com/wiki/APL2
[20] 01:07:42 J NuVoc Dictionary https://code.jsoftware.com/wiki/NuVoc
[21] 01:11:25 Index Origin https://aplwiki.com/wiki/Index_origin
[22] 01:27:15 CPU Cache https://en.wikipedia.org/wiki/CPU_cache
[23] 01:33:00 ValGrind Tool https://valgrind.org/docs/manual/
Perf linux https://perf.wiki.kernel.org/index.php/Tutorial
[24] 01:35:58 Contact AT ArrayCast DOT Com
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