9.34.1 Top new questions this week

9.34.1.1 Compile vs FunctionCompile

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291161

I wanted to look at the pros & cons of Compile & FunctionCompile. This code below is from Neat Examples in FunctionCompile documentation. 
... 
[compile] [function-comparison] [function-compile]
 

asked by Ted Ersek https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=87943 Score of 17

answered by Henrik Schumacher https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=38178 Score of 15

9.34.1.2 A perforated ding dong surface

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291108

Looking at this surface, which I created with  Blender / Python , 
 
I asked myself how we can duplicate some aspects of the scene with ... 
[plotting]
 

asked by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 9

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 12

9.34.1.3 Why is CorrelationFunction returning a value greater than 1?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291164

OK, I'm getting crazy on this: 
 CorrelationFunction[ARProcess[{0.9}, 1], 1] 
 
And the output is... 1.071 (!) 
The symbolic version 
... 
[bugs] [correlation]
 

asked by Massimo Ortolano https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14065 Score of 7

9.34.1.4 How to write a duplicate mapping function?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=290929

I need a function  MapDuplicate  that maps a function on all the duplicates in a list. 
Consider the following list: 
... 
[list-manipulation] [map]
 

asked by user13892 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13892 Score of 7

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 5

9.34.1.5 How to select elements from a List based on conditions on an analogous list?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291047

c and z are equal-sized lists.  Whichever elements in z meet a certain criterion, I want a list of the corresponding elements from c.  This is the clunky way I came up with: 
... 
[list-manipulation]
 

asked by Jerry Guern https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=20042 Score of 6

answered by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 6

9.34.1.6 Show positions of duplicated matrix elements

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291060

1. Problem statement 
I want to replace duplicated elements within a matrix with a placeholder value. 
2. Example data 
... 
[matrix] [function-construction]
 

asked by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 5

answered by kglr https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=125 Score of 6

9.34.1.7 Swap lists and sequences

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=291014

I'm looking for a function which does the following: 
 ListSequenceSwap[{6, {1, 2, 3}, 4, 5, {2, 2}, {4}}] 
 
{{6}, 1, 2, 3, {4, 5}, 2, 2, 4} 
... 
[list-manipulation] [function-construction]
 

asked by eldo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14254 Score of 5

answered by Syed https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=81355 Score of 2