3.7.1 Top new questions this week

3.7.1.1 How can I detect locations of Go (aka Baduk, Weiqi) stones on a board?

http://mathematica.stackexchange.com/questions/121835/how-can-i-detect-locations-of-go-aka-baduk-weiqi-stones-on-a-board

 
The Goal 
 
There are a couple apps that score a Go board from a photo. I was wondering if something like that would be possible with Mathematica. The key step is to detect the positions of the stones  ...
 

- asked by Mark S. (19 votes), answered by halirutan (2 votes)

3.7.1.2 What are all the "magic" Symbols in the Mathematica language?

http://mathematica.stackexchange.com/questions/121981/what-are-all-the-magic-symbols-in-the-mathematica-language

 
Leonid Shifrin once wrote (excerpted): 
 
 
(Unevaluated) is one of a very few "magic symbols", along with Sequence and Evaluate - these are deeply wired into the system and can not be easily  ...
 

- asked by Mr.Wizard (16 votes), answered by Mr.Wizard (9 votes)

3.7.1.3 What has changed in pattern matching functions with the Orderless attribute?

http://mathematica.stackexchange.com/questions/121564/what-has-changed-in-pattern-matching-functions-with-the-orderless-attribute

 
In making an attempt to answer this question, we ran into a version-dependent pattern-matching issue. An extended discussion in the comments transpired, and some inconsistencies arose.  Consider the  ...
 

- asked by march 16votes

3.7.1.4 Converting a Sierpinski tetrahedron to a Graph

http://mathematica.stackexchange.com/questions/121553/converting-a-sierpinski-tetrahedron-to-a-graph

 
I need a representation of a 3D Sierpinski gasket as a graph to perform some simulations on. The 2D version is included in GraphData[], but the 3D one is nowhere to be found, so I was wondering if  ...
 

- asked by FEARxxx (13 votes), answered by J. M. (2 votes)

3.7.1.5 Working with DynamicModule: SetDelayed + OwnValues

http://mathematica.stackexchange.com/questions/121584/working-with-dynamicmodule-setdelayed-ownvalues

 
Shortly, definitions in form of e.g. x:= RandomReal[] have to be avoided inside DynamicModule[{x}, ...]. Why?, this Prints immediately: 
 
DynamicModule[{x}, x := Print[1]; {}] 
 
 
It hit us hard in the  ...
 

- asked by Kuba (12 votes), answered by Kuba (13 votes)

3.7.1.6 How to speed up pattern matching

http://mathematica.stackexchange.com/questions/121911/how-to-speed-up-pattern-matching

 
Main Problem 
 
Mr.Wizard posed this question when discussing another problem. 
 
I reproduce the main part of Mr.Wizard's problem here: 
 
MatchQ[{1, 2, 3, 4, 5}, {x__?((Echo[##]; False) &), y__}] 
 
 
On  ...
 

- asked by Wjx (11 votes), answered by Michael E2 (5 votes)

3.7.1.7 How to efficiently implement k-FN (k-Furthest Neighbors)?

http://mathematica.stackexchange.com/questions/121541/how-to-efficiently-implement-k-fn-k-furthest-neighbors

 
I'd like to pick k points from a set of points in n-dimensions that are approximately "maximally apart" (sum of pairwise distances is almost maxed). What is an efficient way to do this in MMA? Using  ...
 

- asked by M.R. (10 votes), answered by C. Woods (2 votes)