9.34.2 Greatest hits from previous weeks

9.34.2.1 How do I make a 3DPlot using cylindrical coordinates?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=19076

I'm trying to plot a function of the form $z(r,\theta)$ where $r \in [0, R]$ for a finite R, $\theta \in [0,2\pi[$, and z is the third coordinate, a function of the first two. I couldn't find anything ... 
[plotting]
 

asked by Learning is a mess https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5643 Score of 20

answered by whuber https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=91 Score of 29

9.34.2.2 Get a "step-by-step" evaluation in Mathematica

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=148

Is it possible in Mathematica to get a step-by-step evaluation of some functions; that's to say, outputting not only the result but all the stages that have led to it? If so, how does one do it? 
 
... 
[evaluation] [interactive] [faq]
 

asked by Cydonia7 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44 Score of 143

answered by J. M.'s lack of A.I. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 118

9.34.2.3 How to create a new "person curve"?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=17704

Wolfram|Alpha has a whole collectionź of parametric curves that create images of famous people. To see them, enter  WolframAlpha["person curve"]  into a Mathematica ... 
[graphics] [image-processing] [algorithm] [wolfram-alpha-queries] [generative-art]
 

asked by Simon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=34 Score of 91

answered by Vitaliy Kaurov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=13 Score of 49

9.34.2.4 Skip header lines on import

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=50718

When importing a data file what are the comment symbols for Mathematica? 
That is, given a file like this 
 
 blabla 
bulbul 
 
1 2 6 54 7 ... 
.. 
 
 
what symbol do I have ... 
[import] [text]
 

asked by MaxJ https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=14687 Score of 21

answered by george2079 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2079 Score of 18

9.34.2.5 Entering numbers in Scientific Notation?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=36792

I need to play with a lot of powers such as  10^-3 .  1E-3  does not work for it. Is there any short form for it? 
[number-representation]
 

asked by hhh https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=2000 Score of 80

answered by Joe https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=44710 Score of 2

9.34.2.6 Finding unit tangent, normal, and binormal vectors for a given r(t)

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=18598

For my Calc III class, I need to find $T(t), N(t)$, and $B(t)$ for $t=1, 2$, and $-1$, given $r(t)=\{t,t^2,t^3\}$. 
 
I've got Mathematica, but I've never used it before and I'm not sure how to coerce ... 
[equation-solving] [calculus-and-analysis] [geometry] [vector-calculus] [homework]
 

asked by a98 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5605 Score of 32

answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 47

9.34.2.7 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 lack of A.I. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 17