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vgr's profile
Venkatesh Rao
Venkatesh Rao
Venkatesh Rao
@vgr

Tweets

Venkatesh Rao

@vgr

Conversational account. For work follow @ribbonfarm, @breaking_smart, @artofgig. Tweets are 90% vacuous views, apathetically held. Mediocritopian. IKEA builder.

Los Angeles, CA
venkateshrao.com
Joined August 2007

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    1. Venkatesh Rao‏ @vgr 11 Feb 2019
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      Sometimes the universe gives you a sign that you're on the right path. I was wondering how to apply metaphor of frenet-serret formulas (coordinate-free ways of describing curves) to twitter and blog threads, and look what I found on the wiki page: RIBBONS! https://en.wikipedia.org/wiki/Frenet%E2%80%93Serret_formulas …pic.twitter.com/99ba2nJLmR

      1 reply 2 retweets 26 likes
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    2. Venkatesh Rao‏ @vgr 11 Feb 2019
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      Think of the frenet-serret formulas as a way of keeping track of your driving using the odometer, steering wheel angle, road bank angle (nonzero on turns), and uphill/downhill gradient. If you logged all 4 numbers precisely at all times, you'd know where you were without GPS

      1 reply 0 retweets 6 likes
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      Venkatesh Rao‏ @vgr 11 Feb 2019
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      This is a better approach to doing math on twisty-turny paths like roller coasters or spirals or... threads... than the usual way of extrinsic coordinate systems (either explicit like y=f(x) or implicit like f(x,y)=0) but it's not super intuitive.

      1:28 PM - 11 Feb 2019
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      2 replies 0 retweets 3 likes
        1. New conversation
        2. Venkatesh Rao‏ @vgr 11 Feb 2019
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          Roads are frenet ribbons :Dpic.twitter.com/Ep8qEl5WhM

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        3. Venkatesh Rao‏ @vgr 11 Feb 2019
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          Heh, I just remembered. At Xerox, as a random side thing, I wrote some code, using frenet-serret frames, for modeling how paper path (paper flow through a printer) could take arbitrary twists and turns through modular printers that put multiple print engines in parallel/series

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        4. Venkatesh Rao‏ @vgr 11 Feb 2019
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          This is like rack-mounted cloud-like print architecture (known as TIPP: tightly integrated parallel printing). Never very popular/practical, but fascinating to think about. Like distributed computing for printing. Paper flow being effectively a packet-switched network

          1 reply 1 retweet 7 likes
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        5. Venkatesh Rao‏ @vgr 11 Feb 2019
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          (basic idea is that instead of building a single giant extremely high-speed production printer, like old-school Cray supercomputers), you assemble a lot of smaller printers into an parallel array, with a shared paper path (kinda like a rack-scale high-speed bus in a datacenter)

          1 reply 0 retweets 4 likes
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        6. Venkatesh Rao‏ @vgr 11 Feb 2019
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          If paper weren't dying, this would open up fascinating possibilities for real-time variable printing at binding level. Variable information printing already allows every copy of a page to be somewhat different. TIPPed printer racks could effectively shuffle pages like card decks

          2 replies 0 retweets 4 likes
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        7. Venkatesh Rao‏ @vgr 11 Feb 2019
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          I am the king of pointless bunnytrails... still, to get back to original point, I'm trying to think about threaded longform content in a "frenet serret" way where book-like formats are more extrinsic coordinate based.

          3 replies 1 retweet 3 likes
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        8. Venkatesh Rao‏ @vgr 11 Feb 2019
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          Writing naturally has something like an arc-length parameter (the independent variable in frenet-serret)... word count. But tweets and blog posts are "scalars". To F-Size them, you'd need to think of them as vectors. Every chunk having an orientation and direction as well.

          3 replies 1 retweet 5 likes
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        9. Venkatesh Rao‏ @vgr 11 Feb 2019
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          In books pages/chapters are scalars, though we think in terms of quasi-vector qualities (direction of narrative arc, "twist" endings), but these can lean on inherited logic of a "plot" scaffolding conceived beforehand as a "plan". I want the dead-reckoning internal equivalent.

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        10. Venkatesh Rao‏ @vgr 11 Feb 2019
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          Why do things in this complicated way? Well, we're moving from a Newtonian zeitgeist to a relativistic zeitgeist. Frenet-serret frames lead on to curve space times of general relativity. If the space you are living in is curved, intrinsic coordinates work better.

          2 replies 3 retweets 7 likes
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        11. End of conversation
        1. New conversation
        2. Cameron Brown‏ @gribbly 11 Feb 2019
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          Replying to @vgr

          huh... am I thinking about this right to interpret it as a kind of dead reckoning? In the sense of recording change over time in terms of the internal vars of a system (with the implicit promise of replaying that change, given sufficient capture fidelity)

          1 reply 0 retweets 0 likes
        3. Venkatesh Rao‏ @vgr 11 Feb 2019
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          Replying to @gribbly

          Yes, roughly speaking, though frenet-serret is a kinematics model while dead-reckoning is a dynamic model that assumes an inertial physics to do path integration. Ie pure geometry vs. physics.

          0 replies 0 retweets 1 like
        4. End of conversation

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