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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Weeks 10 + 11; Change: No Longer Possible To Merge Metadata; Books on Old Age; Health Tree Maps; MRA - Men's Rights Activists; Writing Good C++14; Risk Assessment - Fukushima; The Future of Advertising and Surveillance; Travelling With Betaferon; I think I know what I dislike so much about Metafilter; Weeks 8 + 9; More; Pastamore - Bad Italian in Vitacura; History Books; Iraq + The (UK) Governing Elite; Answering Some Hard Questions; Pinochet: The Dictator's Shadow; An Outsider's Guide To Julia Packages; Nobody gives a shit; Lepton Decay Irregularity; An Easier Way; Julia's BinDeps (aka How To Install Cairo); Good Example Of Good Police Work (And Anonymity Being Hard); Best Santiago Burgers; Also; Michael Emmerich (Vibrator Translator) Interview (Japanese Books); Clarice Lispector (Brazillian Writer); Books On Evolution; Looks like Ara (Modular Phone) is dead; Index - Translations From Chile; More Emotion in Chilean Wines; Week 7; Aeon Magazine (Science-ish); QM, Deutsch, Constructor Theory; Interesting Talk Transcripts; Interesting Suggestion Of Election Fraud; "Hard" Books; Articles or Papers on depolarizing the US; Textbook for "QM as complex probabilities"; SFO Get Libor Trader (14 years); Why Are There Still So Many Jobs?; Navier Stokes Incomplete; More on Benford; FBI Claimed Vandalism; Architectural Tessellation; Also: Go, Blake's 7; Delusions of Gender (book); Crypto AG DID work with NSA / GCHQ; UNUMS (Universal Number Format); MOOCs (Massive Open Online Courses); Interesting Looking Game; Euler's Theorem for Polynomials; Weeks 3-6; Reddit Comment; Differential Cryptanalysis For Dummies; Japanese Graphic Design; Books To Be Re-Read; And Today I Learned Bugs Need Clear Examples; Factoring a 67 bit prime in your head; Islamic Geometric Art; Useful Julia Backtraces from Tasks; Nothing, however, is lost with less discomfort than that which, when lost, cannot be missed; Article on Didion; Cost of Living by City; British Slavery; Derrida on Metaphor; African SciFi; Traits in Julia; Alternative Japanese Lit; Pulic Key as Address (Snow); Why Information Grows; The Blindness Of The Chilean Elite; Some Victoriagate Links; This Is Why I Left StackOverflow; New TLS Implementation; Maths for Physicists; How I Am 8; 1000 Word Philosophy; Cyberpunk Reading List; Detailed Discussion of Message Dispatch in ParserCombinator Library for Julia; FizzBuzz in Julia w Dependent Types; kokko - Design Shop in Osaka; Summary of Greece, Currently; LLVM and GPUs; See Also; Schoolgirl Groyps (Maths); Japanese Lit; Another Example - Modular Arithmetic; Music from United; Python 2 and 3 compatible alternative.; Read Agatha Christie for the Plot; A Constructive Look at TempleOS; Music Thread w Many Recommendations; Fixed Version; A Useful Julia Macro To Define Equality And Hash; k3b cdrom access, OpenSuse 13.1; Week 2; From outside, the UK looks less than stellar; Huge Fonts in VirtualBox; Keen - Complex Emergencies; The Fallen of World War II

© 2006-2015 Andrew Cooke (site) / post authors (content).

First napito Results

From: "andrew cooke" <andrew@...>

Date: Sat, 8 Sep 2007 05:53:40 -0400 (CLT)

Got the first graphics out of my new art project (napito - posted some of
the scheme code earlier).  There's still a lot to do, but I am really
pleased at how this looks - there's a "black and white line plot"
aesthetic with Op Art vibes.


So far I have support for plotting lines and polygons (and transforming
the coordinate system), and for generating the bounding boxes.  Next I
need to do the dynamics (collision detection and physics being the hardest

The code to generate the above is:

(let* ((line (ln-line 1 1 0 '(1 0) '(-0.2 2 0) '(0.1 0)))
       (rotation (ln-rotation-coverage line 0 9))
       (path (ln-path-coverage line 0 9))
       (border (ln-border line 0 9))
       (engine (nap-ps-engine '()))
       (sample (map nap-line (ln-sample line 0 9.05 0.1))))
  (nap-generate engine (nap-series*
                        (nap-shift-x 2)
                        (nap-shift-y 2)
                        (nap-scale 0.5)
                         (nap-polygon rotation)
                         (nap-polygon path)
                         (nap-polygon border)
                         (nap-series sample)

Where the shift/scale is necessary as I don't have any default transforms
configured (so the initial coord system is Postscript's default).


PS For the record, just dumped Mefi again.  Was an error to go back. 
Don't clearly understand what it is about that place.  Anyway, asked for
account to be cancelled and blocked DNS.

Collision Detection Working

From: "andrew cooke" <andrew@...>

Date: Sun, 9 Sep 2007 12:15:08 -0400 (CLT)

Just got this working too.  See

The process is:
- for a particular time interval calculate all bounding boxes and identify
  interacting lines
- repeatedly divide the interval in two until we find the first interacting
- continue halving the interval down to some time limit
- use an iterated first order solution to find all possible candidates
  (there are four line ends, each will at some point(s) intersect the
  extended other line)
- filter candidates based on time interval
- score candidates by time order and geometry
- select best scoring candidate


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