6.12.1 Top new questions this week

6.12.1.1 How to make a structured mesh with a hole and extrude it

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224739

I am trying to use the FEMAddOns package to make a structured mesh with a hole and then extrude it. As a warm up example this worked nicely. 
Needs["FEMAddOns`"] 
pts1 = Table[ 
25. (  ... 
[finite-element-method] [mesh]
 

asked by Hugh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12558 14 votes

answered by Tim Laska https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=61809 13 votes

6.12.1.2 How to NOT a specific pattern?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=225008

been going around in cirlces on this: 
{1/3, 1, 0.22, 3, "v", 4} /. _?NumericQ -> "999" 
Now I'm trying to replace everything that is not a number; is there a way to do this?  ... 
[pattern-matching]
 

asked by CuriousDudeFromEgypt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=66462 10 votes

answered by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 13 votes

6.12.1.3 Ordering Problem With VoronoiMesh

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224830

Imagine I want to model 2D cells moving in a tissue. Consider, as an example, Lloyd's relaxation algorithm. Using VoronoiMesh I'm able to mimic some cell movement. Now, if I colour one of the cells in  ... 
[mesh] [cells] [sorting] [lattices] [order]
 

asked by sam wolfe https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=64001 9 votes

answered by TumbiSapichu https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53229 2 votes

6.12.1.4 Peculiar behaviour in the implementation of Filling

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224907

I was working with mathematica and I need to use "Filling", however I notice that it doesn't work when you have "small" numbers, for example if I make the following: 
... 
[plotting] [graphics] [bugs] [filling]
 

asked by Cruz https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=69573 9 votes

6.12.1.5 i_:0 1 varies in v12.1: incompatible change or bug?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224987

Just check 
i_: 0 | 1 // FullForm 
 
In v12.0 or earlier the output is 
Alternatives[Optional[Pattern[i, Blank[]], 0], 1] 
 
 
But in v12.1 the output becomes 
Optional[Pattern[i, Blank[]], Alternatives[0,  ... 
[pattern-matching] [notebooks] [core-language] [precedence]
 

asked by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 9 votes

answered by Szabolcs https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12 9 votes

6.12.1.6 Inverse of StringReplace

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=225071

Suppose I have the following StringReplace rule 
StringReplace[st, {"a" -> "0", "OverBar[a]" -> "1", "b" -> "1", 
... 
[string-manipulation]
 

asked by math https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72358 8 votes

answered by Suba Thomas https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5998 8 votes

6.12.1.7 Intersection of 3 circles in GeometricScene

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=224874

I am trying to represent the image below in Mathematica and can't seem to make it work. There doesn't seem to be any constraint of type circle intersection in the documentation. I tried this: 
... 
[geometry]
 

asked by SorinS https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=73427 8 votes

answered by SneezeFor16Min https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=69875 11 votes