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Postscript. Would Ken sent a message like the above? He would not.☺

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 ...

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

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).

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 ...

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...

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[?...

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)...

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,(⍎...

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...

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Re: WWKD

WWKD

Ian Sharp — 1932-2021

Re: ⊕ and ⊗

⊕ and ⊗

Jean Iverson — 1925-2021

indexing by booleans

where

subtraction on 1-byte integers

addition on 1-byte integers

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