9.33.2 Greatest hits from previous weeks

9.33.2.1 How to add a vertical line to a plot

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=3561

In the plot below I would like to add two vertical lines at $x = \frac{\pi}{15} \pm \frac{1}{20}$. 
How can I do that? 
 
... 
[plotting]
 

asked by sjdh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=515 Score of 80

answered by Ajasja https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=745 Score of 98

9.33.2.2 My Girlfriend is going to prison...Save her with Math

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=135937

Salacious title, but true story. 
 
... 
[plotting] [interpolation] [modeling]
 

asked by Prisoners Dilema https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=46025 Score of 41

answered by bobthechemist https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7167 Score of 24

9.33.2.3 Using Export[] sends the file where?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=8586

I am trying to use the  Export  command to convert a list of plots into a *.gif file, and the command runs and executes well, but I can't find the file! Where is it ... 
[export]
 

asked by Patrick Da Silva https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1785 Score of 45

answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 Score of 58

9.33.2.4 1 Plot, 2 Scale/Axis

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=627

I would like to plot those two datasets on top of each other. But they have very different range on the $y$ axis. How can I have two different axis? 
 
I found the following on the help menu but quite ... 
[plotting] [customization]
 

asked by 500 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=172 Score of 160

answered by ArgentoSapiens https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=92 Score of 162

9.33.2.5 Even Fibonacci numbers

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=37266

Today, I found the Euler Project. Problem #2 is 
 
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 
... 
[number-theory] [project-euler]
 

asked by xyz https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9627 Score of 34

answered by rcollyer https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=52 Score of 47

9.33.2.6 Where is Abbott? How to make logograms from the film "Arrival"?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=137156

The film Arrival showed Wolfram Language code in action analysing alien logograms. A recent 
blog describes some details and 
mentions 
a live-coding video by Christopher Wolfam. See also Stephen Wolfram'... 
[graphics] [generative-art]
 

asked by KennyColnago https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=3246 Score of 20

9.33.2.7 Where can I find examples of good Mathematica programming practice?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=18

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ... 
[reference-request] [programming]
 

asked by J. M.'s lack of A.I. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 595

answered by faysou https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=66 Score of 523