Fold and Scan

The Array Cast

Array Cast - April 28, 2023
Show Notes

Thanks to Bob Therriault, Marshall Lochbaum, and Adám Brudzewsky for gathering these links:

[01] 00:01:35 J903 on iOS https://code.jsoftware.com/wiki/Guides/iOS
J9.5 https://code.jsoftware.com/wiki/System/Installation#J9.5_BETA
m. Modular arithmetic https://code.jsoftware.com/wiki/Vocabulary/mdot
[02] 00:02:53 Suggestions for Stephen's book [e-mail]
[03] 00:06:31 Rich's Problem Solving video https://www.youtube.com/watch?v=O73HYH0p8eo
[04] 00:07:49 Henry Rich Fold Episode https://www.arraycast.com/episodes/episode48-henry-rich
Kadane's Algorithm https://en.wikipedia.org/wiki/Maximum_subarray_problem
[05] 00:11:20 J Under (Dual) Conjunction https://code.jsoftware.com/wiki/Vocabulary/ampdot
Fold in q https://code.kx.com/q/ref/accumulators/#while
Fold in BQN https://mlochbaum.github.io/BQN/doc/fold.html
Fold(Reduce) in APL https://aplwiki.com/wiki/Reduce
Fold in J https://code.jsoftware.com/wiki/Vocabulary/fcap
[06] 00:15:07 Taylor Series https://en.wikipedia.org/wiki/Taylor_series
[07] 00:22:10 J Prefixes https://code.jsoftware.com/wiki/Vocabulary/bslash
J Suffixes https://code.jsoftware.com/wiki/Vocabulary/bslashdot
[08] 00:28:02 q Scan Iterator https://code.kx.com/q/ref/iterators/
[09] 00:36:49 Tom McGuire's Kadane Tutorial https://code.jsoftware.com/wiki/Essays/Kadane_Algorithm;_J_Tutorial
Will Gajate's J-k Fold equivalents https://code.jsoftware.com/wiki/User:Will_Gajate/FoldVariants
[10] 00:46:09 Guy Steele's Fortress https://en.wikipedia.org/wiki/Fortress_(programming_language)
[11] 00:47:53 Special Combinations in J https://code.jsoftware.com/wiki/Vocabulary/SpecialCombinations
Thunks https://en.wikipedia.org/wiki/Thunk
[12] 00:50:02 Apex https://www.snakeisland.com/techrpt.pdf
Futhark https://en.wikipedia.org/wiki/Futhark_(programming_language)
BQN vs. C https://mlochbaum.github.io/BQN/implementation/versusc.html
[13] 00:53:05 Scan in q https://code.kx.com/q/ref/over/
Scan in BQN https://mlochbaum.github.io/BQN/doc/scan.html
Scan in APL https://aplwiki.com/wiki/Scan
[14] 01:07:33 Cut in J https://code.jsoftware.com/wiki/Vocabulary/semidot
[15] 01:14:25 Big O notation https://en.wikipedia.org/wiki/Big_O_notation
[16] 01:17:00 Contact AT ArrayCast DOT Com
[17] 01:17:30 Associative Functions https://en.wikipedia.org/wiki/Associative_property
[18] 01:19:00 Jay Kadane https://en.wikipedia.org/wiki/Jay_Kadane