11.16.3 Can you answer these questions?

11.16.3.1 How can I compute the spatial autocorrelation function from a PDE simulation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=312466

I have a system of PDEs defined over a square domain. The dependent variables are $a(t,x,y),b(t,x,y),c(t,x,y)$, and the system uses Dirichlet boundary conditions with initial conditions defined as ... 
[differential-equations] [probability-or-statistics] [fourier-analysis] [correlation]
 

asked by SAC https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=30415 Score of 1

11.16.3.2 Understanding `PolygonAngle[]`

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=312557

For this simple example of a polygon 
... 
[polygons]
                                                                                  

                                                                                  
 

asked by Ulrich Neumann https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53677 Score of 1

11.16.3.3 How to export labeled data to .mat file?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=312550

From the Mathemetica documentation: 
 
Export["file.mat",{elem1->expr1,elem2->expr2,},"Rules"] uses rules to 
specify the elements to be exported. 
 
But when I try the following:... 
[export]
 

asked by abwatson https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1709 Score of 2