k code

Unofficial. Photo: Matt Hardy on Unsplash.

[Mesh Spreadsheet @MeshSpreadsheet]

Excited to release a new version of Mesh Spreadsheet!

https://t.co/ArMC7MMzLI

[k code @kcodetweets]

@andreypopp @SandMouth Now moved to just https://t.co/3yFm1KnpJL

[k code @kcodetweets]

Arthur Whitney has released an open-source k with the MIT license! See https://t.co/nrhQEsAP4C here: https://t.co/YlsddJKJUG

[k code @kcodetweets]

Flat ranges (f 3 2 => 0 1 2 0 1), same as ,/!':

{(!+/x)-&(0 :':+\x)!x}

Or if you have an occurrence count primitive:

oc:{i-(i:<<x)x?x}
oc@&:

Reverse flat ranges (f 3 2 => 2 1 0 1 0), same as ,/|'!':

{(&a!x)-1+!*|a:+\x}

[k code @kcodetweets]

oantolin found a shorter way to write the k6 prime sieve discussed here - no raze or deep where!

{x^/x*/:x}2+!100

https://t.co/MeeSR75TSZ

[k code @kcodetweets]

Some views from the APL perspective:

Roger Hui's "On Average": https://t.co/GN6Cqyt1hv

"Division by zero in APL: assign return value 0 or 1?" https://t.co/IdQ2UEYVI8

[k code @kcodetweets]

But there are still 'gaps'.

One gap is when we outdex a group, discussed here: https://t.co/GskPzUaxqv

[k code @kcodetweets]

"In fact the opposite is true: these features are designed to give safe robust defaults for numerically unsophisticated programmers, in addition to supporting sophisticated numerical libraries by experts."

[k code @kcodetweets]

Ideally, k's design would minimise the need for the user to explicitly handle special cases (situations such as "if empty, x, else y").

k is already good at this, in part because it tracks the type and structure of empty lists.

[k code @kcodetweets]

What do you get when you divide an empty list by zero?

[k code @kcodetweets]

How are primitive functions (such as 'count') like, or unlike, dictionaries?

For example:

- both can be indexed and inverse-indexed into
- primitives have an infinite domain
- primitive domain can be a general list
- dictionary indexing is rank-sensitive

[k code @kcodetweets]

Advent of Code 2023! K leaderboard: 419401-2f52b175

[Stevan Apter @nostinkingloops]

@kcodetweets maps are fundamental. https://t.co/SIvxzkWVtA

[Dyalog @dyalogapl]

📖Exciting News! 📖 You can now read (for free!) a paper written by Aaron Hsu🎓@arcfide and Rodrigo Girão Serrão for ARRAY 23 (in Orlando🌴this month.)

Download "U-Net CNN in APL: Exploring Zero-Framework, Zero-Library Machine Learning" at https://t.co/hBWrxFMzeo