Viewing profile — jpf0

Yes. this one is fun. Recursive, memoized Fibonacci, the 155th integer precisely. {{(-&2 +&$: -&1) ^: (1& It'll run in your browser in 0.003 seconds. https://jsoftware.github.io/j-…

J recursion is $: You can do flow control in both scripting style and array style. Loops are loops.

Group is (was) a function in various array languages, including K, APL, BQN, J, and Shakti.

I suspect the J package Jd is probably the most non-trivial public codebase. I don’t love the coding style (functions are long and scripted) and it doesn’t make use of newer lambda…

Possibly so. We do simple IO primarily from parquet or csv data, and I am working on the Apache Arrow/Flight package currently. Our data sets typically fit in RAM but either if you…

I cannot share specific projects. J is particularly good for numeric/algorithmic experimentation. It is interactive/REPL-based. Types and boilerplate are minimal. There is no compi…

Yes. Ask questions if you like.

I did some work to compare Jd to data.tables and found that it was more performant in some instances such as on derived columns, and approximately equally performant on aggregation…

J FFI lib call: https://code.jsoftware.com/wiki/Scripts/CallJ and https://code.jsoftware.com/wiki/Guides/DLLs/Calling_the_J_DL... database: odbc, jd, sqlite, mysql, [arrow bindings…

The claim here is +80% reduction in time, +5x throughput relative the current standard. Nice to see illumination of the benefit of high-level algorithmic design associated with the…

Since you supposedly know something about this topic, please contribute it.

Companies that use APL and other array languages in production: https://github.com/interregna/arraylanguage-companies

A bunch of questions: Is multi-threading happening at the level of user-defined functions? How are threads scheduled? What's the underlying method or library for enabling multi-thr…

https://github.com/interregna/arraylanguage-companies

Without general theories, the only reasonable question is "Faster for What"? What are generalizable theories of 'fast'? Fewer bits moving less with fewer instructions, and using th…

Can you comment on experience (or contact me) regarding implementation efficiency? We have recently implemented task-based parallelism in the J language with openMP[0]. Improvement…

LLVM has an openMP implementation

XLA is domain-specific compiler for linear algebra. Triton generates and compiles an intermediate representation for tiled computation. This IR allows more general functions and al…

I'd be interested in hearing of any experience or recommendations. If you have them available, please do send me a message.

While MATLAB and Numpy were influenced by the APL family of languages, they contain a small subset of the design available in the J/K/APL world. Informally most users of array lang…

Congrats on your work with APL. Please do not engage in flaming on obsolete business concerns from 30 years past, on a repeated basis. J is fine, great, easier license, has a large…