9.3.1 Top new questions this week

9.3.1.1 Memory leak with Mathematica Graph functions

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278765

I am running Mathematica 13.2 on a Mac OS Monterey. I have a large code that manipulates graphs both in graph form and as adjacency matrices, computes some graph properties, and returns a list. It has ... 
[performance-tuning] [graphs-and-networks] [memory] [resource-management]
 

asked by Kassa https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90047 Score of 10

answered by Victor K. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1351 Score of 9

9.3.1.2 How to calculate the integral only in real domain?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278638

I have the following integral: 
 Integrate[1/(Sqrt[2] + Cos[4 X] + Sin[4 X]), X, 
Assumptions -> Element[X, Reals]] // Simplify 
 
 
... 
[calculus-and-analysis] [simplifying-expressions] [trigonometry]
 

asked by Anna Schmidt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=90002 Score of 7

answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 8

9.3.1.3 NDSolve very slow on 2D heat equation

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278698

I am trying to solve the 2D heat equation 
$$ 
\begin{cases} 
u_{t}-u_{x x}-u_{y y}=f \\ 
u(0, x, y)=\sin (2 \pi x) \sin (2 \pi y) \\ 
u(t, 0, y)=0 \\ 
u(t, x, 1)=0 \\ 
u_{x}(t, 1, y)=2 \pi e^{-t} \sin (2 \... 
[differential-equations] [performance-tuning] [numerics] [finite-element-method]
 

asked by Charmbracelet https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=77005 Score of 6

answered by xzczd https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1871 Score of 12

9.3.1.4 How to ensure for a solution of `NDSolve` to be positive?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278777

I'am trying to solve kinetic equation for test particles in the Maxwellian plasma. It is Vlasov equation appended with Landau integral of collisions. It is proven that solution of such an equation is ... 
[differential-equations] [precision-and-accuracy]
 

asked by Igor Kotelnikov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=10081 Score of 6

answered by Nasser https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=70 Score of 5

9.3.1.5 Ordering Arguments of Antisymmetric Functions in Cyclic Way

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278673

I have two functions ang and sqa, each of which take two arguments which must be distinct integers between 1 and 6. For instance I could have  ang[2,1]  or ... 
[replacement] [sorting]
 

asked by R.W https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=88631 Score of 6

answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 Score of 8

9.3.1.6 Issues with FindPlanarColoring

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278645

I tried to use FindPlanarColoring on the following  planar graph: 
... 
[graphs-and-networks] [combinatorics]
 

asked by A. Kato https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=62063 Score of 6

answered by cvgmt https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=72111 Score of 6

9.3.1.7 Scalarize a list

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=278626

I need a function that unwraps a singleton atom from an arbitrary nested list and returns all other expressions unchanged. I have come up with the following solution: 
... 
[list-manipulation] [expression-manipulation]
 

asked by sakra https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=68 Score of 6

answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 Score of 4