anfractuosity's comments

On: Show HN: Xenolab – Rasp Pi monitor for my pet carnivourus plants

[anfractuosity]

You might also be interested in this - https://docs.backyardbrains.com/retired/experiments/Plants_V... where they monitor the electrical spikes of the traps.

You can also apparently electrically trigger the closing of fly trap - https://www.tandfonline.com/doi/full/10.4161/psb.2.3.4217

On: Pixel is a unit of length and area

[anfractuosity]

I didn't think a single photosite was directly converted to a single pixel, there's quite a number of different demosaicing algorithms.

Edit: Upon doing some more reading it sounds like a photosite or sensel, isn't a group of sensors, but a single sensor, which can pick up r,g,b,.. light - "each individual photosite, remember, records only one colour – red, green or blue" - https://www.canon-europe.com/pro/infobank/image-sensors-expl...

I couldn't seem to find a particular name for the RGGB/.. pattern that a bayer filter consists of an array of.

On: Show HN: I made a machine learning model to predict 66.45% of NBA games

[anfractuosity]

Yeah, I'd not heard of that either, I recall postcardware though - https://en.wikipedia.org/wiki/Shareware#Postcardware

On: Show HN: Game Bub – open-source FPGA retro emulation handheld

[anfractuosity]

There's a Gameboy clone made by kongfeng that seems kind of like this, with its own chip. I'd love to know more about how they created it.

On: The Taylorator – All Your Frequencies Are Belong to Us

[anfractuosity]

I got my laptop to play Taylor Swift on the AM band - https://www.youtube.com/watch?v=KH9yb1qFKDY by twiddling the memory bus (sounds a bit iffy ;)

Code: https://github.com/anfractuosity/musicplayer

Based on the work of https://github.com/fulldecent/system-bus-radio

On: Fluorescent Mineral Photography

[anfractuosity]

Very cool photos, nice to see rocks from a perspective I'd not seen before.

I came across this recently - https://en.wikipedia.org/wiki/Thermoluminescence where it sounds like some rocks emit light upon heating.

[temp0826 → anfractuosity]

They're minerals, Marie.

(Sorry, I'll see myself out)

On: Ask HN: Books about people who did hard things

[anfractuosity]

I rather liked 'The Idea Factory: Bell Labs and the Great Age of American Innovation'

[Blackstrat → anfractuosity]

Agreed. Just finished it a couple of weeks ago. Hackers by Levy and fire in the Valley may also fit the bill.

On: Ask HN: Books about people who did hard things

[anfractuosity]

Longitude is a great book, I thought this was cool too re. one of the clocks Harrison designed - https://www.theguardian.com/science/2015/apr/19/clockmaker-j...

On: What is it like to be a thermostat? (1996)

[anfractuosity]

https://consc.net/notes/lloyd-comments.html has some more info

On: A Raycaster in Bash

[anfractuosity]

Very cool! I'm curious when it says "did you know that accessing a random element in an array takes linear time", why that's the case, with bash?

[izabera → anfractuosity]

normal arrays in bash are implemented as linked lists. bash stores a pointer to the last accessed element, which turns the most common case of iteration into O(1), but the performance is terrible if you need to jump around

see some basic benchmarks here https://gist.github.com/izabera/16a46ed79c2248349a1fb8384468...

there are also associative arrays which are bucketed hash tables, which are fine for string keys but imho they are hardly ever worth it as a replacement for indexed arrays

[anfractuosity → izabera]

Thanks a lot, that's very interesting re. it using linked lists, and nice benchmark!