4.44.1 Top new questions this week

4.44.1.1 Drawing Clifford Attractors in Mathematica

https://mathematica.stackexchange.com/questions/159668/drawing-clifford-attractors-in-mathematica

 
I came upon the "Clifford Attractor" today, which are equations of the form: 
$$x_{n+1}=\sin(a\ y_n) + c \cos(x_n)$$ 
$$y_{n+1}=\sin(b\ x_n) + d \cos(y_n)$$ 
They create some incredible images by  ...
 

- asked by TreFox (24 votes), answered by Szabolcs (32 votes)

4.44.1.2 Mismatch between Mathematica and COMSOL in 3D FEM problem

https://mathematica.stackexchange.com/questions/159506/mismatch-between-mathematica-and-comsol-in-3d-fem-problem

 
I would like to solve an advection-diffusion problem on a torus domain. There are three Dirichlet conditions: One at the inlet (concentration $c=0$), one at the outlet ($c=0.5$) and one at the wall  ...
 

- asked by Alexander Erlich 16votes

4.44.1.3 Unexpected behaviors in built-in functions

https://mathematica.stackexchange.com/questions/159895/unexpected-behaviors-in-built-in-functions

 
Existence of this topic is discussed in this mathematica.meta post. 
 
 
 
I'm sure I am not the only non-beginner in WL who from time to time finds themselves not being able to predict an outcome of a  ...
 

- asked by Kuba (14 votes), answered by Kuba (6 votes)

4.44.1.4 How to create a faded image using an existing image file

https://mathematica.stackexchange.com/questions/159662/how-to-create-a-faded-image-using-an-existing-image-file

 
The question is simple: 
 
How can I take an image of a perfect stamp (load an image file) such as 
 
 
 
and make it look old, worn, and faded, with missing arbitrary small bits, like the following stamp 
 
...
 

- asked by Vaggelis_Z (12 votes), answered by nikie (27 votes)

4.44.1.5 Building a Noisy Function

https://mathematica.stackexchange.com/questions/159614/building-a-noisy-function

 
Here's a nice function with a nice plot: 
 
f[t_] := Exp[-Abs[t]] Sin[t]; 
Plot[f[t], {t, -10, 10}, PlotRange -> All] 
 
 
 
 
What I would like to do is to make it noisy... to add something to f[t] so  ...
 

- asked by bill s (10 votes), answered by David G. Stork (9 votes)

4.44.1.6 Inaccurate (non-smooth) boundary of the mesh generated by ToElementMesh

https://mathematica.stackexchange.com/questions/159775/inaccurate-non-smooth-boundary-of-the-mesh-generated-by-toelementmesh

 
I try to generate a mesh over a region, which has a wavy boundary at its bottom and needs very fine mesh around the bottom. 
 
However, the generated mesh boundary is not as smooth as the specified one.  ...
 

- asked by Wilhelm (8 votes), answered by user21 (4 votes)

4.44.1.7 remove transparency of background Image

https://mathematica.stackexchange.com/questions/159837/remove-transparency-of-background-image

 
I have the following image: 
 
 
 
As you can see the background is kind of white-ish. 
Now my question is: How can I remove this transperancy of the background image ?
 

- asked by totyped (8 votes), answered by Coolwater (10 votes)