7.18 September 2, 2014
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Top new questions this week:
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[Object separation from a 2.5D
surface]\url{http://mathematica.stackexchange.com/questions/58269/object-se
paration-from-a-2-5d-surface}
I'm trying to identify the shape and the boundaries of objects. The data
was generated with a laser scanner and represent the surface of an area
in which many boulders lay on the ground and making up ...
- asked by zeckra (18 votes), answered by shrx (3 votes)
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[Site - Cell Correspondence in Voronoi Diagram obtained via
VoronoiMesh]\url{http://mathematica.stackexchange.com/questions/58395/site-
cell-correspondence-in-voronoi-diagram-obtained-via-voronoimesh}
Consider the following:
pts = RandomReal[4, {10, 2}];
vor = VoronoiMesh[pts, {{0, 4}, {0, 4}}];
Graphics[{GraphicsComplex[
MeshCoordinates[vor], {Thick, Blue, MeshCells[vor, 1],
...
- asked by RunnyKine (12 votes), answered by ybeltukov (7 votes)
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[How to create a neon light effect in
Mathematica?]\url{http://mathematica.stackexchange.com/questions/58602/how-
to-create-a-neon-light-effect-in-mathematica}
I tried to use Glow to create a neon light effect on a torus object. The
result shown on the left of the picture below looks quite different from
the real one on the right. Is there a way to obtain a ...
- asked by Putterboy (12 votes), answered by DaveStrider (26 votes)
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[Find maximum value of interpolation function - obviously wrong
result]\url{http://mathematica.stackexchange.com/questions/58244/find-maxim
um-value-of-interpolation-function-obviously-wrong-result}
Minimizing and maximizing interpolation function has already been asked
and answered, see here for example.
Yet, I observe a strange behaviour. Well, I can understand that the
wrong guess of ...
- asked by anderstood (11 votes), answered by Karsten 7. (12 votes)
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[Set of integers not divisible by smaller set of
primes]\url{http://mathematica.stackexchange.com/questions/58520/set-of-int
egers-not-divisible-by-smaller-set-of-primes}
Let $p_n$ be the sequence of prime numbers, and $s(x,n)=$ the set of
integers less or equal than $x$ that are not divisible by
$p_1,\dots,p_n.$ I can define it as follows:
...
- asked by martin (10 votes), answered by Mr.Wizard (14 votes)
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[Neumann boundary conditions in NDSolve over nontrivial
region]\url{http://mathematica.stackexchange.com/questions/58412/neumann-bo
undary-conditions-in-ndsolve-over-nontrivial-region}
The problem I would like to solve involves diffusion in the following
region
reg = ImplicitRegion[-5 <= x <= 5 && -5 <= y <= 5
&& x^2 + y^2 >= 1^2, {x, y}];
...
- asked by Greg P (10 votes), answered by user21 (9 votes)
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[Is garbage collection broken in version
10.0.0?]\url{http://mathematica.stackexchange.com/questions/58375/is-garbag
e-collection-broken-in-version-10-0-0}
In version 10.0.0 under Windows I am observing the following behavior:
Do[Module[{foo}, foo[x_] := 1; foo[0]], {10}]
Names["foo$*"]
{"foo$593", "foo$594", "foo$595", "foo$596", "foo$597", ...
- asked by Mr.Wizard (9 votes)
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Greatest hits from previous weeks:
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[Can Mathematica do symbolic linear
algebra?]\url{http://mathematica.stackexchange.com/questions/3242/can-mathe
matica-do-symbolic-linear-algebra}
For instance, is there some way I can say "let A and B be arbitrary real
$m\times n$ and $k\times m$ matrices,
Simplify[Transpose[Transpose[A].Transpose[B]]]" and Mathematica would
simplify it to B.A?
...
- asked by nikie (24 votes), answered by helen (12 votes)
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[How to force
2+2=5]\url{http://mathematica.stackexchange.com/questions/48929/how-to-forc
e-22-5}
I was looking at this question (writing a program such that 2 + 2 = 5)
and tried to write something in Mathematica, but I couldn't get
something to work without completely replacing Plus. Neither of ...
- asked by Artefacto (4 votes), answered by halirutan (7 votes)
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Can you answer these?
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[SyntaxForm not correctly parsed by
FrontEnd]\url{http://mathematica.stackexchange.com/questions/58531/syntaxfo
rm-not-correctly-parsed-by-frontend}
When using TagBox with SyntaxForm, I noticed sometimes it is not well
parsed by the FrontEnd. Here is a minimal example. First input
TagBox["f", "test", SyntaxForm -> "^"] // DisplayForm
Then ...
- asked by Yi Wang (1 vote)
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[Segmentation of
sunspots]\url{http://mathematica.stackexchange.com/questions/58673/segmenta
tion-of-sunspots}
I recently went for a walk with my camera and snapped a few pictures of
the sun. The pictures didn't turn out too well, but this was to be
expected without a telescope. I thought it might be a nice ...
- asked by paw (6 votes)
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[Implementation of Series
function]\url{http://mathematica.stackexchange.com/questions/58343/implemen
tation-of-series-function}
I'm trying to evaluate the partial derivatives of some function F[x,y]
at some point, i.e.
Limit[Limit[D[F[x,y],{x,m},{y,n}],x->x0],y->y0]
However, for higher derivatives I find that it fails ...
- asked by Barefeg (2 votes)