Hacker News: papln

New comment by papln in "Let's remove quaternions from every 3D engine (2018)"

papln — Fri, 31 Jan 2020 20:49:33 +0000

In my college in Antarctica we were taught

  x ^ y = y x^T - x y 
  
  exp(ε x ^ y) v ~ v + ε x ^ y * v
  = ε y (x,v) - v + ε x (y,v)

because we use the left-hand rule down under.

New comment by papln in "Let's remove quaternions from every 3D engine (2018)"

papln — Fri, 31 Jan 2020 20:44:02 +0000

But 3D is the D that matters for 3D games. video games are concrete mathematics, not abstract mathematics.

New comment by papln in "Let's remove quaternions from every 3D engine (2018)"

papln — Fri, 31 Jan 2020 20:40:43 +0000

I miswrote. Rotation calculations are represented (in quaternions and in geometric algebra calculations) as a 3D subspace of R^4, with the "extra" dimension accounted for by constraining quaternions to the unit hypersphere.

Rotations do involve magnitudes when interpreted as an axis (2 dimensional manifold embedded in R^3) and a magnitide (0 to 2pi)

https://en.wikipedia.org/wiki/Axis%E2%80%93angle_representat...

SO(3) is a coordinate-free abstraction that isn't relevant to the topic of GA vs Quaternions for calculating concrete values in computer graphics

New comment by papln in "Some Useful Probability Facts for Systems Programming"

papln — Fri, 31 Jan 2020 20:24:34 +0000

> getting discouraged and quitting

is bad for both player and business

New comment by papln in "Some Useful Probability Facts for Systems Programming"

papln — Fri, 31 Jan 2020 20:22:07 +0000

> reliably throws out improbable events.

which is another way of wording "reliably generates and serves improbable events"

New comment by papln in "3D printed hands are giving Syrian children a second chance"

papln — Fri, 31 Jan 2020 20:19:59 +0000

> There is just as much money to be made in tearing down a civilization as in building one up.

Do you think Steve Jobs, Mark Zuckerberg, and Larry Page, Jeff Bezos, and Bill Gates agree with this statement?

New comment by papln in "Cigarette butts are polluting the ocean more than plastic straws"

papln — Fri, 31 Jan 2020 20:15:58 +0000

I have allergies and my nose runs a lot. Somehow I manage to not throw my tissues on the ground.

Is it so hard to carry an ash box with a cigarette box?

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:26:08 +0000

ToS aren't signed. They are terms of service, not license agreements.

ToS merely need to be disclosed, and the site cna decline service if you violate the terms. A license agreement may subject you to penalties for violating the agreement.

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:24:56 +0000

Like hiQ, you can file a lawsuit and try to win. You might want to wait to see if hiQ wins their case.

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:24:05 +0000

Per hiQ's arugment, but not per any existing ocourt decision.

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:18:41 +0000

No, because what one side of a case argues is not the law. What judges decide is the law.

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:16:17 +0000

When is it "damage", and when is it "declining to contribute" ?

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:15:41 +0000

Does that mean that ia grocery store offers free samples, I can go in every day and take all the samples, and the grocery is not allowed to selectively prevent me access?

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:14:00 +0000

There's no reason to believe that.

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:13:27 +0000

Please read the linked decision before putting words in judges' mouths:

https://parsers.me/appeal-from-the-united-states-district-co...

New comment by papln in "Congrats! Web scraping is legal! (US precedent)"

papln — Wed, 29 Jan 2020 17:12:36 +0000

> hiQ argued

That does not mean that hte court agreed.

The judges said that CFAA doesn't apply.

In other words, the judges said that LinkedIn couldn't use the US legal system to force HiQ to stop. Judges didn't say that LinkedIn was barred from using technical measures.

The court did allow a preliminary injunction against LinkedIn, due to the possibility of "monopolies" (to be determined in Court later), pending resolution of that latter question.

LinkedIn might still win their claim to their right to block scrapers via technical means.

New comment by papln in "Off-Facebook activity"

papln — Wed, 29 Jan 2020 17:02:20 +0000

Here's what Google says. Ask your lawyer if you want to know what it means.

https://support.google.com/websearch/answer/54068?p=web_app_...

When Web & App Activity is on, you can include additional activity like:

* Sites and apps that partner with Google to show ads

* Sites and apps that use Google services, including data that apps share with Google

* Your Chrome browsing history

New comment by papln in "Off-Facebook activity"

papln — Wed, 29 Jan 2020 16:49:07 +0000

I'm not anyone's lawyer. These are questions, not answers: GDPR is about collecting data from you, right? If Site X is sending data about you to Facebook, perhaps that's an issue with Site X's GDPR compliance, not Facebook's?

New comment by papln in "A Graph of Related Subreddits"

papln — Wed, 29 Jan 2020 16:42:19 +0000

> inciting drama and outrage between people just for kicks.

"popping their filter bubbles", or "are generally interested in boundary-pushing ideas", or "are susceptible to the rage-inducing trolls who run fringe communities".

"Affinity for extreme ideas of any kind" maybe a stronger / more common personality trait than "interested in one extreme point in the vector space of ideas".

New comment by papln in "A Graph of Related Subreddits"

papln — Wed, 29 Jan 2020 16:39:24 +0000

The metric (Jaccard distance) is symmetric. The assymmetry comes from ranking: JordanPeterson is more special-interest/intense-interest with a narrower more homogenous audience than the_donald, so it probably has more very-similar subreddits to it than the_donald does. the_donald would have more related reddits but with less perfect overlap in membership.

A broader base of people (about 1/4 to 1/2 of the voting age US public) is aware and supportive of Donald Trump and for a wide variety of reasons, and much more than half at at least aware of Donald Trump. Jordan Peterson has a much smaller following, who are interested in him for similar reasons to each other.