10.16.2 Greatest hits from previous weeks

10.16.2.1 How do I plot a plane EM wave?
10.16.2.2 How to plot an ellipse?
10.16.2.3 How can I write the equation 9 x == 5 y + 8 z + 27 in the form 9x - 5y - 8z - 27=0?
10.16.2.4 How do I plot $x^2+y^2=1$ in 3D?
10.16.2.5 Even Fibonacci numbers
10.16.2.6 Plot data from txt file?
10.16.2.7 Assign the results from a Solve to variable(s)
10.16.2.1 How do I plot a plane EM wave?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=1987

I would like to display an electromagnetic (EM) wave.  I have written code that works, but it does not "shade" the area between the graph and the axes.  Both the ... 
[graphics] [physics] [visualization]
 
asked by Rainforest Frog https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=202 Score of 23
answered by J. M.'s missing motivation https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 17
10.16.2.2 How to plot an ellipse?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=20100

I'm new to Mathematica, and I'm finding it difficult to plot an ellipse. 
I tried using 
 
 Plot[(x/5)^2 + (y/3)^2 == 1, {x, -5, 5}, {y, -3, 3}] 
 
 
but I'm getting ... 
[plotting]
 
asked by Sriram https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=6075 Score of 20
answered by Jens https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=245 Score of 33
10.16.2.3 How can I write the equation 9 x == 5 y + 8 z + 27 in the form 9x - 5y - 8z - 27=0?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=296023

I use 
 myeq = CoplanarPoints[{{7, 4, 2}, {8, 1, 5}, {9, 6, 3}, {x, y, z}}] 
 
 
9 x == 27 + 5 y + 8 z 
 
I am trying to write  myeq  in ... 
[output-formatting]
 
asked by Thuy Nguyen https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=69240 Score of 8
answered by E. Chan-López https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=53427 Score of 7
10.16.2.4 How do I plot $x^2+y^2=1$ in 3D?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=10710

How would I plot $x^2+y^2=1$ in 3D (it would form a cylinder)? Since there is no $z$ in the equation, I can't solve for it and use  Plot3D . Or can I just put the ... 
[plotting]
 
asked by diracdeltafunk https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2282 Score of 7
answered by Mark McClure https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36 Score of 14
10.16.2.5 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
10.16.2.6 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 Score of 21
answered by user1066 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=106 Score of 24
10.16.2.7 Assign the results from a Solve to variable(s)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=6669

I understand Mathematica can't assign the results of a Solve to the unknowns because there may be more than 1 solution. How can I assign the 4 values of following result to variables? 
... 
[equation-solving] [assignment] [faq]
 
asked by stevenvh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1450 Score of 64
answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 38