4.18.3 Can you answer these questions?

4.18.3.1 How to get parent key in Query on Association/Dataset?

https://mathematica.stackexchange.com/questions/144995/how-to-get-parent-key-in-query-on-association-dataset

 
Is there a general and terse method to obtain the parent key of the current "position" in a Query of an Association/Dataset? 
 
Say I have the following Association. 
 
assoc = 
<|"A" -> 
...
 

- asked by Edmund 3votes

4.18.3.2 Can anyone help me decipher these few lines? Also, converting this code for a 2x2 matrix input to a 3x3 matrix input?

https://mathematica.stackexchange.com/questions/145049/can-anyone-help-me-decipher-these-few-lines-also-converting-this-code-for-a-2x

 
Here's the code. I'm completely new to Mathematica so bear with me. 
 
clear[ug]; 
ug[{{a11_, a12_}, {a21_, a22_}}] := 
Module[{A, f, b1, b2, y1, y2, U, P1, P2, UG}, 
A = {{a11, a12}, {a21, a22}}; 
...
 

- asked by Pacotacobell 2votes

4.18.3.3 Bifurcation package like AUTO?

https://mathematica.stackexchange.com/questions/144795/bifurcation-package-like-auto

 
I was wondering if there is any available continuation and bifurcation analysis package for Mathematica. I'm looking for something like AUTO. I've seen there is already a Matlab version of the  ...
 

- asked by Mirko Aveta 3votes

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