7.14.2 Greatest hits from previous weeks

7.14.2.1 Plot data from txt file?
7.14.2.2 How to make a Spherical Cow?
7.14.2.3 What are the most common pitfalls awaiting new users?
7.14.2.4 My Girlfriend is going to prison...Save her with Math
7.14.2.5 Plotting the Star of Bethlehem
7.14.2.6 Generate a Unit Circle Trigonometry
7.14.2.7 Extract real part of a complex expression better than Re does
7.14.2.1 Plot data from txt file?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=5910

I have data in file.txt which can be expressed by 20000x11 matrix. I do not want to import all of these data. How can I plot graph of the column 1 & column 4? 
[plotting] [import]
 
asked by Gokce https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1297 21 votes
answered by user1066 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=106 24 votes
7.14.2.2 How to make a Spherical Cow?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=125043

Being a theoretical physicist, I always have a great respect for Spherical Cow. So I thought about making one myself. I am not sure how can I create (something considered to be the simplest!) this ... 
[geometry] [image3d]
 
asked by Sumit https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=8070 69 votes
answered by andre314 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5467 76 votes
7.14.2.3 What are the most common pitfalls awaiting new users?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=18393

As you may already know, Mathematica is a wonderful piece of software. 
However, it has a few characteristics that tend to confuse new (and sometimes not-so-new) users. That can be clearly seen from ... 
[programming] [core-language] [faq] [guidelines]
 
asked by Dr. belisarius https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=193 485 votes
answered by Michael E2 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=4999 288 votes
7.14.2.4 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 42 votes
answered by bobthechemist https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=7167 23 votes
7.14.2.5 Plotting the Star of Bethlehem

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=236499

Christmas is around the corner! In preparation, consider the polynomial 
 f[x_,y_]:= 1/10 (4 - x^2 - 2 y^2)^2 + 1/2 (x^2 + y^2) 
 
and define $r=(f_x,f_y)$ using the ... 
[plotting] [equation-solving] [graphics] [performance-tuning] [visualization]
 
asked by fwgb https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44151 30 votes
answered by Roman https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=26598 22 votes
7.14.2.6 Generate a Unit Circle Trigonometry

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=2456

Struggling often with Trigonometry I would like to have some code to generate this Unit Circle Trigonometry. Would be of great help when I need to transform some data : 
[graphics] [trigonometry]
 
asked by 500 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=172 18 votes
answered by Mark McClure https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36 32 votes
7.14.2.7 Extract real part of a complex expression better than Re does

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=3306

I have a complex expression with real positive variables only. 
 
Mathematica Input Style: 
 
... 
[symbolic] [trigonometry]
 
asked by max https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=796 34 votes
answered by nixeagle https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=814 53 votes