8.9.1 Top new questions this week

8.9.1.1 Mathematica internal source code for a numerical method
8.9.1.2 How to union 3D region to calculate volume?
8.9.1.3 Longest arrangement of n-digit square numbers s.t. last digit equals first digit of next
8.9.1.4 Help understand a line of code
8.9.1.5 Fork/Pull Request ResourceFunction?
8.9.1.6 Switching 'X' and 'Y' axes
8.9.1.7 Grouping consecutive elements at specified positions
8.9.1.1 Mathematica internal source code for a numerical method

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=265062

I read this (Six Reasons Why the Wolfram Language Is (Like) Open Source), which inspired me to re-investigate Mathematica's implementation of some numerical methods. I would like to see the code that ... 
[implementation-details] [open-source]
 
asked by Spencer Bryngelson https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85529 Score of 9
answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 Score of 12
8.9.1.2 How to union 3D region to calculate volume?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=265156

I have a Teapot likes: 
 region = RepairMesh[ExampleData[{"Geometry3D", "UtahTeapot"}, "MeshRegion"]] 
 
 
I want to calculate the volume ... 
[regions] [computational-geometry] [opencascade]
 
asked by yode https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=21532 Score of 7
answered by user21 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=18437 Score of 8
8.9.1.3 Longest arrangement of n-digit square numbers s.t. last digit equals first digit of next

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=265002

I have this problem: consider all the square numbers with exactly n digits, I want to arrange them such that the last digit of a square is equal to first digit of the next square and find the longest ... 
[number-theory]
 
asked by user967210 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85211 Score of 7
answered by mikado https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36788 Score of 7
8.9.1.4 Help understand a line of code

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264939

this is a weird question, but I read the following line of code: 
... 
[code]
 
asked by diegor https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85422 Score of 7
answered by AsukaMinato https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=68689 Score of 8
8.9.1.5 Fork/Pull Request ResourceFunction?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=264977

Wolfram is so rapidly evolving its extension technologies, 
that it's hard to figure out how to meaningfully contribute to the community. 
Over the years we've seen: Applications, Packages/Paclets and ... 
[scripting] [paclets]
 
asked by Ranza https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=12327 Score of 7
8.9.1.6 Switching 'X' and 'Y' axes

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=265254

Let's say, I have a function $y = f(x)$ which I want to plot on Mathematica in such a way that the traditional X-Axis is the Y-Axis and vice-versa. 
I know that I can plot the function, 
... 
[plotting]
 
asked by mnuizhre https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85177 Score of 6
answered by bmf https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=85558 Score of 6
8.9.1.7 Grouping consecutive elements at specified positions

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=265101

Let 
 L1={1,2,4,6,8,9,10,14,15,17,21,22,72,76,80,96,106,116,117} 
 
Question1) Group from 10-th to 14-th elements in  L1 . 
So that the ... 
[list-manipulation] [functions] [performance-tuning] [function-construction] [built-in-symbols]
 
asked by imida k https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34532 Score of 6
answered by I.M. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26815 Score of 6