musgravepeter

18 ms·

91.
by musgravepeter 11y ago
There is a vast literature on some simplifications: Circular Restricted Three Body (two bodies in a fixed orbit, third subject to their field) and even two fixed points (Euler Problem). Even here there are complex orbits. Maybe an app unto
92.
by musgravepeter 11y ago
nbody here. Note the Android Lite version 2.0 somehow ended up in Occulus mode in the final APK. A fix is uploading to Google play now! I have no idea how to even turn that on in Unity - so it's a bit of a puzzle!
93.
Infinite Force? Forty-year-old Fortran to the rescue(nbodyphysics.com)
71 points by musgravepeter 11y ago|23 comments
94.
by musgravepeter 11y ago
I found this worthwhile.
95.
Exploring the physics of a chocolate fountain(phys.org)
1 points by musgravepeter 11y ago|0 comments
96.
by musgravepeter 11y ago
A great book on good physics which did not pan out is http://www.amazon.com/Higher-Speculations-Theories-Revolutio... Vortex theory was very cool, but not how the world worked.
97.
by musgravepeter 11y ago
The arxiv pre-print is http://arxiv.org/pdf/1507.07009.pdf
98.
The Pluto system: Initial results from its exploration by New Horizons(arxiv.org)
1 points by musgravepeter 11y ago|0 comments
99.
by musgravepeter 11y ago
Yeah - I hear you. Converting 1000 lines was a BIG drag. I did experiment with native and f2c versions - but when targeting for mobile it meant a bunch of Android and iOS packaging that was kinda irritating. The specific code I targeted (3
100.
by musgravepeter 11y ago
I first learned FORTRAN in high school, where we used optical sense cards to create code. The teacher took them each night to the board office and brought back our output for the next class. If you had ten days for an assignment, you had te
101.
by musgravepeter 11y ago
Thanks for the heads up!
102.
by musgravepeter 11y ago
Also Mike L (BB founder) funded the Institute that did this work
103.
New Quantum Cats game launches to build better understanding of quantum concepts(quantumcats.ca)
16 points by musgravepeter 11y ago|3 comments
104.
New Quantum Cats game launches to build better understanding of quantum concepts(quantumcats.ca)
1 points by musgravepeter 11y ago|0 comments
105.
by musgravepeter 11y ago
This came up in the car ride back from work with my spouse. I argued that there must be some other interpretation since I couldn't believe that they'd throw this out there - maybe some part of recent culture I was not aware of. Wr
106.
Fox Yeah(groups.google.com)
3 points by musgravepeter 11y ago|2 comments
107.
The Vagus Nerve: A Back Door for Brain Hacking(spectrum.ieee.org)
112 points by musgravepeter 11y ago|37 comments
108.
by musgravepeter 11y ago
At some level TED etc. are just providing what the market (us) wants. Given a choice between thinking hard and an easy answer we tend to prefer the later until it no longer meets our needs or becomes clearly wrong.
109.
by musgravepeter 11y ago
I agree it's unfortunate. I think this is really a flimsy use of a technical term which does have a precise meaning in the context of mathematical physics to make the idea of multi-dimensional array seem "deeper" than it real
110.
by musgravepeter 11y ago
A 1D list of numbers is not necessarily a "vector" in the Differential Geometry sense. The definition of a vector or tensor is based on how it transforms as the co-ordinate system transforms. See e.g. http://en.wikipedi
111.
Escher in the Sky [pdf](arxiv.org)
6 points by musgravepeter 12y ago|0 comments
112.
by musgravepeter 12y ago
I agree with your point about embedding. The game solves the geodesic equation using the instrinsic geometry of the torus in 2D space without reference to any embedding. It is in this sense that one might call the physics "correct&quot
113.
by musgravepeter 12y ago
Very hypnotizing! I assume you have a heuristic for geodesic motion? I doubt I could write down the metrics for some of those surfaces in a Lundum Dare timeframe.
114.
by musgravepeter 12y ago
Thanks! You can get a free version for iOS, Android and Blackberry... (Same as paid version, just no bonus ships)
115.
by musgravepeter 12y ago
The other comment makes an excellent point about the mapping. That's also crucial.
116.
by musgravepeter 12y ago
(Nbodyphysics) Yeah - maybe if there's interest. The code gets a bit messier since I need multiple co-ordinate patches and there is a discontinuity...
117.
by musgravepeter 12y ago
(nbodyphysics here) I initially had the same thought, but when you think of a Mercator map, the top edge is a point, the north pole. On a torus it's a line, the inner circle.
118.
Geodesic Asteroids: Classic arcade game gets correct physics(nbodyphysics.com)
55 points by musgravepeter 12y ago|17 comments
119.
Geodesic Asteroids: Classic arcade game gets correct physics(nbodyphysics.com)
1 points by musgravepeter 12y ago|0 comments
120.
by musgravepeter 12y ago
Actually laughed out loud at this. http://en.wikipedia.org/wiki/On_the_Internet,_nobody_knows_y...

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