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Re: WWKD

Postscript. Would Ken sent a message like the above? He would not.
by Roger|Dyalog
on Thu Aug 12, 2021 4:34 pm
 
Forum: APL Chat
Topic: WWKD
Replies: 1
Views: 1511

WWKD

In the HOPL IV Q&A , I mentioned the WWKD (what would Ken do) subroutine that I have in my head. In the immediately following comment, Morten said, Well, we didn’t all have the benefit working enough with Ken to be able to predict what Ken would say, … I would like to point out that I benefited ...
by Roger|Dyalog
on Sat Aug 07, 2021 1:16 am
 
Forum: APL Chat
Topic: WWKD
Replies: 1
Views: 1511

Ian Sharp — 1932-2021

Ian Sharp, founder of I.P. Sharp Associates (IPSA), passed on 2021-07-16. Many of us started our careers at IPSA and are forever grateful.

Ian Sharp Quotations and Anecdotes
by Roger|Dyalog
on Sat Jul 17, 2021 5:31 pm
 
Forum: APL Chat
Topic: Ian Sharp — 1932-2021
Replies: 0
Views: 1401

Re: ⊕ and ⊗

The Kronecker product in APL is either A×⍤0 2⊢B or A∘.×⊂B or ⊃⍪⌿,/A∘.×⊂B , and are more general.

In any case, I think the arguments for ⊕ are strong and are made stronger by the arguments for ⊗, and will prevail in the long term (e.g. 100 years).
by Roger|Dyalog
on Thu Jul 15, 2021 12:46 am
 
Forum: APL Chat
Topic: ⊕ and ⊗
Replies: 2
Views: 1809

⊕ and ⊗

This post is a condensed and expanded version of the APL Chat Forum post j. from 2020-04-09. From [ Hui and Kromberg 2020 ]: For example, the dialect J has the scalar function j. defined by {⍺←0 ⋄ ⍺+⍵×0j1}¨; that is, a scalar function whose monadic definition is ⍵×0j1 and whose dyadic definition is ...
by Roger|Dyalog
on Tue Jul 13, 2021 9:33 pm
 
Forum: APL Chat
Topic: ⊕ and ⊗
Replies: 2
Views: 1809

Jean Iverson — 1925-2021

Eric Iverson wrote in the Jprogramming Forum on 2021-06-27: Jean Iverson - 1925 - 2021 Jean Iverson passed away peacefully on Friday afternoon, June 25, 2021 in a Toronto hospital. Her children were all able to have good, in person, visits during her last days. She had a full and wonderful life, and...
by Roger|Dyalog
on Wed Jun 30, 2021 7:16 pm
 
Forum: APL Chat
Topic: Jean Iverson — 1925-2021
Replies: 0
Views: 1370

indexing by booleans

In the recent sequence of posts (for example Addition on 1-Byte Integers ), the game was to write a function g such that (x symbol y) ≡ x g y where g does not use the function denoted by "symbol". Here, the game is to write a function h which does not use [;] or ⌷, so that: x ← t[?...
by Roger|Dyalog
on Wed Jun 16, 2021 5:21 am
 
Forum: APL Chat
Topic: indexing by booleans
Replies: 0
Views: 1405

where

In previous posts , the game was to write functions g such that (x symbol y) ≡ x g y for x and y of interest where g does not use the primitive symbol in question. Here, the game is to write a function h which does not use ⍸ or / or ⌿, so that for boolean vector b, b ← 1=?9973⍴2 (⍸b)...
by Roger|Dyalog
on Wed Jun 09, 2021 4:17 pm
 
Forum: APL Chat
Topic: where
Replies: 0
Views: 1416

subtraction on 1-byte integers

In a previous post, Addition on 1-Byte Integers , the game was to write a function g such that (x+y) ≡ x g y for x and y of interest where g does not use + or -. Here, the game is to write a function g which does not use + or -, so that for 1-byte integer vectors x and y: all1 ← {¯128,(⍎...
by Roger|Dyalog
on Fri Jun 04, 2021 1:02 am
 
Forum: APL Chat
Topic: subtraction on 1-byte integers
Replies: 1
Views: 1516

addition on 1-byte integers

In previous posts, Membership , Index-Of , Interval Index , and Replicate , the game was to write functions g such that (x symbol y) ≡ x g y for x and y of interest where g does not use the primitive symbol in question. Here, the game is to write a function h which does not use + or -, so th...
by Roger|Dyalog
on Thu Jun 03, 2021 5:26 pm
 
Forum: APL Chat
Topic: addition on 1-byte integers
Replies: 0
Views: 1446
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