7.4.1 Top new questions this week

7.4.1.1 What's the difference between these 2 associations?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238880

I have 2 associations similar to these simplified ones: 
... 
[associations]
 

asked by Coolwater https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9754 16 votes

answered by Leonid Shifrin https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81 16 votes

7.4.1.2 How can I handle graphics or artworks with millions of points?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238735

As a hobby, I am trying to use Mathematica and Wolfram Language as a tool for making generative artworks. Generative art techniques may require drawing millions of points, lines, or curves. For ... 
[graphics] [visualization] [generative-art]
 

asked by mikabozu https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=74721 15 votes

answered by George Varnavides https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=41179 21 votes

7.4.1.3 ContourPlot3D, grid of cylinders

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238849

I am trying to make a 3D contour plot that looks like a grid of cylinders to represent the Fermi surface of a metal, like below: 
 
I have no problem generating something that kind of looks like it. 
 
(<... 
[plotting]
 

asked by Nick https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=76998 10 votes

answered by cvgmt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72111 13 votes

7.4.1.4 Distorting image to ensure consistent vanishing point

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238742

Here's Giorgio de Chirico's painting, Ariadne: 
 
The Surrealist artist deliberately broke the rules of geometric perspective, giving the work his characteristic sense of mystery and unease. 
What would ... 
[image-processing] [geometric-transform]
 

asked by David G. Stork https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9735 10 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 2 votes

7.4.1.5 Export infinite looping GIFs by default

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238591

 frames=Table[Plot[Sin[x(1+a x)],{x,0,6}],{a,0,2,0.2}]; 
Export["test.gif",frames] 
 
The above code runs in version 9.0 to get a infinite looping GIF ... 
[export] [animation] [gif-format]
 

asked by expression https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7339 10 votes

answered by Kuba https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5478 7 votes

7.4.1.6 Replace a color in image with hatchfilling

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238687

Is it possible to identify a color (say grey in a 3 color  Black ,  Gray  and  White  image) and ... 
[graphics] [image-processing]
 

asked by skyfire https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70181 9 votes

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 10 votes

7.4.1.7 MeshRefinementFunction on 2D surfaces embedded in 3D

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=238705

DiscretizeRegion doesn't seem to run the supplied MeshRefinementFunction when meshing a 2D surface in 3D. 
For example: 
... 
[regions] [mesh] [discretization]
 

asked by alessandro https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=42454 7 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 3 votes