Hacker News: marcle

New comment by marcle in "Advent of Code 2024 in pure SQL"

marcle — Sun, 29 Dec 2024 16:44:26 +0000

Answering my own question: Umbra and PostgreSQL include "#" as an operator for bitwise xor, whereas DuckDB does not.

New comment by marcle in "Advent of Code 2024 in pure SQL"

marcle — Sun, 29 Dec 2024 09:02:09 +0000

This is very interesting code that uses Umbra v0.2-957, PostgreSQL 17.2, and DuckDB v1.1.3.

One minor point: some of the problems could not be implemented in DuckDB due to a missing xor operator - but the documentation includes an xor function (https://duckdb.org/docs/sql/functions/numeric.html#xorx-y) for the same version. Is the form of the function not suitable?

New comment by marcle in "Unseen Thunderbirds film reels found in garden shed"

marcle — Tue, 08 Oct 2024 09:19:01 +0000

Nice childhood memories: "Thunderbirds are go!"

I always wondered how the palm trees were able to be flattened:).

New comment by marcle in "Fun with Positron: Combining the Best of RStudio and VS Code"

marcle — Wed, 10 Jul 2024 15:48:19 +0000

This is a very interesting IDE to support data science.

Has anyone tried using the Eclipse Theia IDE for data science?

One of these IDEs may finally entice me away from ESS, magit and Org Mode.

Fun with Positron: Combining the Best of RStudio and VS Code

marcle — Wed, 10 Jul 2024 15:41:43 +0000

Article URL: https://www.andrewheiss.com/blog/2024/07/08/fun-with-positron/

Comments URL: https://news.ycombinator.com/item?id=40928164

Points: 2

# Comments: 1

New comment by marcle in "Two hunters from the same lodge afflicted with sporadic CJD: is CWD to blame?"

marcle — Sat, 20 Apr 2024 08:04:02 +0000

"PSA" can also be probabilistic sensitivity analysis. I do health economic evaluations for prostate cancer screening -- which leads to interesting ambiguities:).

New comment by marcle in "History of Uniform Random Number Generation (2017) [pdf]"

marcle — Sun, 17 Mar 2024 19:36:27 +0000

The article references the SSJ Java package which is developed by the author and his colleagues. This provides implementations for many RNGs -- and some nice tools for simulations: https://github.com/umontreal-simul/ssj

New comment by marcle in "Owl project (OCaml scientific computing) formally concluded"

marcle — Tue, 20 Feb 2024 14:59:10 +0000

And see the discussion at https://discuss.ocaml.org/t/owl-project-concluding/14117

New comment by marcle in "Owl project (OCaml scientific computing) formally concluded"

marcle — Mon, 19 Feb 2024 12:53:10 +0000

See also some discussion at https://www.reddit.com/r/ocaml/comments/1au329z/owl_project_...

Owl project (OCaml scientific computing) formally concluded

marcle — Mon, 19 Feb 2024 12:53:10 +0000

Article URL: https://github.com/owlbarn/owl

Comments URL: https://news.ycombinator.com/item?id=39429222

Points: 3

# Comments: 2

New comment by marcle in "Learn Datalog Today"

marcle — Sun, 21 Jan 2024 21:41:53 +0000

ErgoAI is as "an enterprise-level extension of the Flora-2 system" which was recently open-sourced: https://github.com/ErgoAI . It seems to be well documented.

New comment by marcle in "Axiom – A scientific computation system"

marcle — Sat, 13 Jan 2024 10:28:32 +0000

See https://fricas.github.io/, which includes a 990 page book and detailed documentation.

New comment by marcle in "8 months of OCaml after 8 years of Haskell"

marcle — Fri, 29 Dec 2023 18:00:24 +0000

This is a nicely balanced discussion of the two languages - with much food for thought.

8 months of OCaml after 8 years of Haskell

marcle — Fri, 29 Dec 2023 17:58:42 +0000

Article URL: https://discourse.haskell.org/t/8-months-of-ocaml-after-8-years-of-haskell-in-production/8405

Comments URL: https://news.ycombinator.com/item?id=38808019

Points: 13

# Comments: 1

New comment by marcle in "Understanding Automatic Differentiation in 30 lines of Python"

marcle — Fri, 25 Aug 2023 16:39:12 +0000

I wrote a purely functional AD library in Mercury [0], which adapts a general approach from [1]. I believe that Owl provides a similar approach [2].

[0] https://github.com/mclements/mercury-ad

[1] https://github.com/qobi/AD-Rosetta-Stone/

[2] https://github.com/owlbarn/owl/tree/main/src/base/algodiff

New comment by marcle in "Functions and algorithms implemented purely with TypeScript's type system"

marcle — Wed, 05 Jul 2023 09:22:00 +0000

The following homage to Aphyr’s "Typing the technical interview" solves the N-queens problem using types in Typescript. This is both funny and insightful.

https://www.richard-towers.com/2023/03/11/typescripting-the-...

(Edit: this is mentioned elsewhere in this thread by Kerrick)

New comment by marcle in "Relic: Functional relational programming for Clojure(Script)"

marcle — Mon, 27 Feb 2023 07:50:56 +0000

Waldek Hebisch, who is the maintainer for the Fricas computer algebra software, also maintains a 64-bit version of Poplog for amd64/x86_64:

https://github.com/hebisch/poplog https://www.cs.bham.ac.uk/research/projects/poplog/freepoplo...

New comment by marcle in "Architecture of Advanced Numerical Analysis Systems"

marcle — Thu, 16 Feb 2023 17:25:50 +0000

This is a free book on Owl. I have only looked at the chapter on automatic differentiation - and it looks good.

Architecture of Advanced Numerical Analysis Systems

marcle — Thu, 16 Feb 2023 17:25:50 +0000

Article URL: https://link.springer.com/book/10.1007/978-1-4842-8853-5

Comments URL: https://news.ycombinator.com/item?id=34821867

Points: 1

# Comments: 1

New comment by marcle in "Autodidax: JAX core from scratch"

marcle — Sun, 12 Feb 2023 10:39:38 +0000

I find the solutions from https://github.com/qobi/AD-Rosetta-Stone/ to be very helpful, particularly for representing forward and backward mode automatic differentiation using a functional approach.

I used this code as inspiration for a functional-only (without references/pointers) in Mercury: https://github.com/mclements/mercury-ad