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David Moore
Attends San Diego Miramar College
Lives in San Diego, CA
171 followers|80,481 views
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Education
  • San Diego Miramar College
    2011 - present
Basic Information
Gender
Male
Birthday
March 19, 1994
Story
Tagline
Aspiring physicist
Introduction
I'm a student who would love to go into high-level academia. See my portfolio and my youtube channel for some projects I've worked on.

I started programming at the age of 11, and now I'm studying physics and some pure math at the level of real analysis, introductory computational physics, and introductory dynamics (Lagrangians and what-not). I do all this on my free time, but I have very little going for me academically, being in community college, with my only STEM classes being introductory linear algebra and vector calculus (old news!)

If you have project recommendations, book recommendations, or anything really, I'd love to hear them!
Bragging rights
Pretty fluent with Java/C++ (Yes really!)/JS/DBPro/Mathematica
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
San Diego, CA
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David Moore

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David Moore's profile photoKevin Morgan's profile photo
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Hi David, check out - https://vimeo.com/123752837
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David Moore

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The self-fulfilling prophecy.
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David Moore's profile photoKevin Morgan's profile photo
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Yep  youve left me for dead, but how are you thngs ok . There are some you which interesting and I share with family. So thanks for what you have shared.
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David Moore

fractal art (pictures)  - 
 
+Chris Thomasson Couldn't resist! Sorry, copying+pasting destroys all the indentation. The "hat" vectors aren't actually unit vectors, but they play the role of axes. 

v=Table[{Cos[2 Pi k/3],Sin[2 Pi k/3],0},{k,0,2}];
i={{1,2,3}};
vmotif={{0,0,0},{1,0,0},{1/3,1/3,0.3},{0,1,0}};
imotif={{1,2,3},{1,3,4},{4,3,2}};
replacement[{v_,i_}]:=Module[{retv,reti,xhat,yhat,zhat,origin,vindex},
retv={};
reti={};
vindex=0;
Do[
origin=v[[indc[[1]]]];
xhat=v[[indc[[2]]]]-v[[indc[[1]]]];
yhat=v[[indc[[3]]]]-v[[indc[[1]]]];
zhat=Cross[xhat,yhat];
retv=Join[retv,Table[pt.{xhat,yhat,zhat}+origin,{pt,vmotif}]];
reti=Join[reti,vindex+imotif];
vindex+=Length[vmotif];
,{indc,i}];
{retv,reti}
];
plot[s_]:=Graphics3D[{EdgeForm[None],Yellow,GraphicsComplex[#1,Polygon[#2]]}]&@@s;
plot[Nest[replacement,{v,i},9]]
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Chris “M” Thomasson's profile photoRoger Bagula's profile photo
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If you can close the bottom,
 there is no reason you can't get a 3d printed model of it
with some work.
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+Tim Hutton I'm trying to find a javascript (or maybe it was java) thing and it might have been you that posted it. It was a little app involving solid geometry where you could type a string in a box below the app. If you wrote "d" it would take the dual of the current shape, and if you wrote "sd" it would take the dual then stellate, and I think if you wrote "tsd" it would take the dual then stellate then truncate. There were about six other commands too if I recall correctly. Let me know if any of that sounds familiar!
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Tim Hutton's profile photoDavid Moore's profile photo
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+Tim Hutton Ahh that's almost exactly it. I remember one which I think used Three.js and was on some university user page. But from the code it looks like it might be easy enough to convert to three.js myself. Thanks!
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Just for the picture :D
 
The fastest growing energy sources: Wind and Solar. According to IEA, "the global wind power capacity was 238 Gigawatts (GW) at the end of 2011, up from just 18 GW at the ens of 2000, with an average growth rate of over 25% over the past five years ... The global total of solar PV was roughly 67 GW at the end of 2011" with annual growth rates of "over 50%."

Picture: Normally invisible wind wakes take shape in the clouds behind the Horns Rev offshore wind farm west of Denmark. (Credit: Vattenfall)

Mechanically generated turbulence is visible as "swirl" behind the turbine.

The visible wind wake itself is a result of lower pressure behind the turbine which forces humidity to condense. The pressure is lower, because of a speed deficit (part of the wind speed is transferred into thrust of the turbine).

Shear stress is the reason that the wind wake widens. It induces a speed gradient vertical to the main flow direction.
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Doing ODE practice, using Mathematica to check my answers, and waiting to check my answers until the end:
{True, True, True, True, {True, True}, {True, True}}
{True, True, True, True}

Woo!
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In his circles
73 people
Have him in circles
171 people
Claire Toffolo's profile photo
David Adnum's profile photo
Craig Reynolds's profile photo
All My Sons Moving & Storage's profile photo
Anna Watson's profile photo
Flavio Fetahu's profile photo
whithe billy's profile photo
Jibon Nath's profile photo
Richard Green's profile photo

David Moore

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+George Hart  , going to build a second at the UCSD math club meeting, and later design some polyhedra of our own!
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I always thought pie charts were pretty bad as a visualisation option. This set of slides shows you how to get them actually looking good.
The poor, maligned 3D pie chart. He is so popular among the common folk, but put him next to his peers and his vacant stare betrays (not entirely unfounded) feelings of insecurity and inadequacy. Sometimes the only way to address such feelings is to let go of your inhibitions and do something ...
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David Moore

fractal art (pictures)  - 
 
New fractal 3d substitution system. Note: I changed "zhat", in a way so that its magnitude is symmetric upon swapping the "xhat" and "yhat" vectors, and in a way that's consistent with units!

v=Table[{Cos[2 Pi k/3],Sin[2 Pi k/3],0},{k,0,2}];
i={{1,2,3}};
vmotif=N@{{0,0,0},{1,0,0},{1/3,1/3,Sqrt[2/9]/4},{0,1,0}};
imotif={{1,2,3},{1,3,4},{3,2,4}};
replacement[{v_,i_}]:=Module[{retv,reti,xhat,yhat,zhat,origin,vindex},
retv={};
reti={};
vindex=0;
Do[
origin=v[[indc[[1]]]];
xhat=v[[indc[[2]]]]v[[indc[[1]]]];
yhat=v[[indc[[3]]]]-v[[indc[[1]]]];
zhat=Cross[xhat,yhat]/((xhat.xhat)(yhat.yhat))^(1/4);
retv=Join[retv,Table[pt.{xhat,yhat,zhat}+origin,{pt,vmotif}]];
reti=Join[reti,vindex+imotif];
vindex+=Length[vmotif];
,{indc,i}];
{retv,reti}
];
plot[s_]:=Graphics3D[{Opacity[0.4],Yellow,EdgeForm[None],GraphicsComplex[#1,Polygon[#2]]},Boxed>False]&@@s;
plot[Nest[replacement,{v,i},7]]

Other motifs:

Koch (my interpretation):
vmotif=N@{{0,0,0},{1,0,0},{0,1,0},{1/2,0,0},{0,1/2,0},{1/2,1/2,0},{1/3,1/3,Sqrt[2/3]/2}};
imotif={{1,4,5},{2,6,4},{3,5,6},{4,7,5},{6,5,7},{4,6,7}};

Rough:
vmotif=N@{{0,0,0},{1,0,0},{0,1,0},{1/2,0,0.1},{0,1/2,0.1},{1/2,1/2,0.1}};
imotif={{1,4,5},{2,6,4},{3,5,6},{4,6,5}};

Jagged Koch:
vmotif=N@{{0,0,0},{1,0,0},{0,1,0},{1/2,0,0},{0,1/2,0},{1/2,1/2,0},{1/3 0.7,1/3 0.9,Sqrt[2/3].7/2}};
imotif={{1,4,5},{2,6,4},{3,5,6},{4,7,5},{6,5,7},{4,6,7}};
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David Moore's profile photoRoger Bagula's profile photo
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David Moore
The Google+ editor mangles your code. The midpoint one runs.
Do you have something like a cloud address?
What I do is upload my files to the cloud and then they can be run.
Example: my trefoil fractal program as a link:
https://drive.google.com/file/d/0BwHVCm5rTlOjR3FRUi1OVm53TWM/view?usp=sharing
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Black Holes are Neat: The Movie
Interstellar - About building a Black Hole 720p
If anyone who reads this goes to see Interstellar afterwards, keep an eye out - there's one line that's something along the lines of, "you know relativity!" that I really wanted to quote. I forgot the line!!!
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First Antares and now Virgin Galactic? It's a sad week for space.
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Perseverance
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