Control Structures in the Array Languages

The Array Cast

Array Cast - July 22, 2022
Show Notes

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

[01] 00:01:10 Dyalog Problem /solving Contest https://contest.dyalog.com/?goto=welcome
[02] 00:01:35 Dyalog Early Bird Discount https://www.dyalog.com/user-meetings/dyalog22.htm
[03] 00:03:50 Iverson Notation https://apl.wiki/Iverson_Notation
[04] 00:05:06 GOTO in Early APL https://www.jsoftware.com/papers/APL1.htm#1.2
[05] 00:06:06 Control Structures https://en.wikipedia.org/wiki/Control_flow
[06] 00:08:33 Goto in APL https://aplwiki.com/wiki/Branch
[07] 00:09:45 Goto in J https://code.jsoftware.com/wiki/Vocabulary/gotodot
[08] 00:09:55 try. catch. throw. in J https://code.jsoftware.com/wiki/Vocabulary/trydot
[09] 00:10:46 whilst. in J https://code.jsoftware.com/wiki/Vocabulary/whiledot
[10] 00:14:09 APL Control Structures https://aplwiki.com/wiki/Control_structure
[11] 00:17:43 J Control Structures https://code.jsoftware.com/wiki/Vocabulary/ControlStructures
[12] 00:18:00 if. else. elseif. do. end. in J https://code.jsoftware.com/wiki/Vocabulary/ifdot
[13] 00:20:40 singleton in APL https://aplwiki.com/wiki/Singleton
[14] 00:21:01 for. for_ijk. in J https://code.jsoftware.com/wiki/Vocabulary/fordot
[15] 00:23:45 Go language for loop syntax https://go.dev/tour/flowcontrol/1
[16] 00:25:22 Javascript Mapping arguments] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map#syntax
[17] 00:26:21 Clojure Mapping https://clojuredocs.org/clojure.core/map
[18] 00:27:40 BQN Control Structures https://mlochbaum.github.io/BQN/doc/control.html
[19] 00:28:20 BQN Blocks https://mlochbaum.github.io/BQN/doc/block.html
[20] 00:28:49 BQN ? predicate https://mlochbaum.github.io/BQN/doc/block.html#predicates
[22] 00:31:05 APL if else operands https://dfns.dyalog.com/n_else.htm
[23] 00:31:42 BQN Stranded Block functions https://mlochbaum.github.io/BQN/doc/control.html#switch-case
[24] 00:32:30 APL Arguments and Operands https://aplwiki.com/wiki/Operand
[25] 00:36:00 Dfn Dop https://help.dyalog.com/latest/#Language/Defined%20Functions%20and%20Operators/DynamicFunctions/Dynamic%20Operators.htm
[26] 00:36:45 BQN Block definition and modifiers https://mlochbaum.github.io/BQN/doc/block.html
[27] 00:38:15 Power Operator
APL https://aplwiki.com/wiki/Power_(operator)
J https://code.jsoftware.com/wiki/Vocabulary/hatco
BQN https://mlochbaum.github.io/BQN/doc/repeat.html
[28] 00:41:30 k/Q Control Structures https://code.kx.com/q/ref/cond/
[29] 00:43:25 power operator in q https://code.kx.com/q/ref/do/
for in k ⍣n/^:n: https://k.miraheze.org/wiki/For
fixed point in k ⍣≡/^:_: https://k.miraheze.org/wiki/Fixedpoint
[30] 00:43:40 if in q https://code.kx.com/q/ref/if/
[31] 00:44:20 while in q https://code.kx.com/q/ref/while/
[32] 00:45:38 Replicate kludge example of if: in APL https://tryapl.org/?clear&q=a%E2%86%9010%20%E2%8B%84%20%E2%8D%8E(5%3C3)%2F%27a%E2%86%90a%2B1%27%20%E2%8B%84%20%E2%8E%95%E2%86%90a%20%E2%8B%84%20%E2%8D%8E(5%E2%89%A03)%2F%27a%E2%86%90a%2B1%27%20%E2%8B%84%20%E2%8E%95%E2%86%90a&run
[33] 00:51:00 J's z locale https://code.jsoftware.com/wiki/Vocabulary/ZeeLocale
[34] 00:52:29 Dfn guard example https://aplwiki.com/wiki/Dfn#Guards
[35] 00:54:20 Game of life with power operator https://tio.run/##SyzI0U2pTMzJT///3z3fR@FR2wSFam19nUe9W2sf9ewyVjB@1NF1aIWxtoHOoRWPuhb9//@obypQUWZeZklmYg6Qpf6od7667aO2iY969j7qnQdHXIe2H9oOlDu0nQtMQphgGsaEQC5dXV0ukN1QM8F8DaDAo97FRprYRI3hogA
[36] 00:56:40 BQN power operator without infinity https://mlochbaum.github.io/BQN/doc/repeat.html
[37] 00:58:34 Recursion in BQN https://mlochbaum.github.io/BQN/doc/block.html#self-reference
[38] 00:59:20 CBQN System ._While_ https://github.com/dzaima/CBQN/blob/master/docs/system.md#_while_
[39] 01:03:30 APL with power match https://aplwiki.com/wiki/Power_(operator)#Examples
[40] 01:04:13 J power operator with infinity https://code.jsoftware.com/wiki/Vocabulary/hatco#u.5E:_.28Converge.29
[41] 01:08:24 Example of power applied when it shouldn't (argument > test point) https://tryapl.org/?clear&q=1%2B%E2%8D%A3%7B%E2%8D%BA%3E10%7D10&run
[42] 01:10:20 Example of Rank or each to simulate loops https://tio.run/##SyzI0U2pTMzJT///v/pR39RHbRPUA4ryk1OLizPz0tV1HvVurT20wtBAwchAwdjg/38A
[43] 01:13:19 Conor's example of 2 to the power of 2 repeated until over 1000
APL solution https://tryapl.org/?clear&q=%C3%97%E2%8D%A8%E2%8D%A3%7B%E2%8D%BA%3E1000%7D2&run
J solution https://jsoftware.github.io/j-playground/bin/html2/#code=t%3D%3A%20*%3A%5E%3A%28%3C%261000%29%5E%3A_%0At%202
BQN solution https://mlochbaum.github.io/BQN/try.html#code=X3doaWxlX+KGkHvwnZS94o2f8J2UvuKImPCdlL1f8J2Vo1/wnZS+4oiY8J2UveKNn/CdlL7wnZWpfQrDl8ucX3doaWxlXyg84p+cMTAwMCkgMg==
[44] 01:15:21 Conor's example of 2 multiplied by 2 repeated until over 1000
APL solution https://tryapl.org/?clear&q=2%C3%97%E2%8D%A3%7B%E2%8D%BA%3E1000%7D2&run
J solution https://jsoftware.github.io/j-playground/bin/html2/#code=t%3D%3A%20%2B%3A%5E%3A%28%3C%261000%29%5E%3A_%0At%202
BQN solution https://mlochbaum.github.io/BQN/try.html#code=X3doaWxlX+KGkHvwnZS94o2f8J2UvuKImPCdlL1f8J2Vo1/wnZS+4oiY8J2UveKNn/CdlL7wnZWpfQory5xfd2hpbGVfKDzin5wxMDAwKSAy
[45] 01:16:49 Adám's example to see the process using quad gets https://tio.run/##SyzI0U2pTMzJT////1Hf1EdtE4wOT3/Uu7gawnnUu0vhUe9WhUfdLUB6l52hgYFBrdH//wA
[46] 01:19:28 Solution to solve problem with no execution if starting argument > 1000
APL solution https://tryapl.org/?clear&q=%7B2%C3%97%E2%8D%A3%7B%E2%8D%BA%3E1000%7D%E2%8D%A3(%E2%8D%B5%E2%89%A41000)%E2%8A%A2%E2%8D%B5%7D1001&run
J solution https://jsoftware.github.io/j-playground/bin/html2/#code=t%3D%3A%20%2B%3A%20%5E%3A%28%3C%261000%29%20%5E%3A_%0At%201001
BQN solution https://mlochbaum.github.io/BQN/try.html#code=X3doaWxlX+KGkHvwnZS94o2f8J2UvuKImPCdlL1f8J2Vo1/wnZS+4oiY8J2UveKNn/CdlL7wnZWpfQory5xfd2hpbGVfKDzin5wxMDAwKSAxMDAx
[47] 01:23:10 Using logarithms to solve the problem
APL solution https://tryapl.org/?clear&q=2*%E2%8C%882%E2%8D%9F1000%20%E2%8B%84%202%C3%97%E2%8D%A3(%E2%8C%88-%2F2%E2%8D%9F1000%202)%E2%8A%A22&run
J solution https://jsoftware.github.io/j-playground/bin/html2/#code=t%3D%3A%20%5E%3E.%40%5E.%261000%0At%202
BQN solution https://mlochbaum.github.io/BQN/try.html#code=4oyI4oy+KDLii4bigbziiqIpIDEwMDA=
[48] 01:25:47 [email protected]
[49] 01:26:24 Transpose Episode https://www.arraycast.com/episodes/episode29-transpose