8.39.2 Greatest hits from previous weeks

8.39.2.1 How to create animated snowfall?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=16881

Well, the title is self-explanatory. What sorts of snowfall can we generate using Mathematica? There are two options I suggest to consider: 
 
1) Continuous GIF animations with smallest possible number ... 
[dynamic] [random] [animation] [generative-art]
 

asked by faleichik https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=219 Score of 42

8.39.2.2 Drawing a square root spiral

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=66969

Here is a start. I'm looking for a nice way to draw it. 
 
... 
[graphics] [geometry]
 

asked by matrix89 https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5379 Score of 24

answered by Bob Hanlon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=9362 Score of 23

8.39.2.3 How do I identify the source of a "Tag times protected" error?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=11982

I have some code that looks like 
 
 Table[ 
a = 1; 
b = {2, 3} 
c = i;, 
{i, 2} 
] 
 
 
which gives an error: 
Set::write: Tag Times in c {2,3} is Protected.... 
[warning-messages] [syntax] [debugging] [faq]
 

asked by dearN https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=204 Score of 31

answered by Mr.Wizard https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=121 Score of 37

8.39.2.4 Finding Limits in several variables

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=21544

Is there a way to find a limit of a multivariable function, like 
 
$$\lim_{(x,y)\to (0,0)} f(x,y)$$ 
with Mathematica? 
 
When $f$ is continuous, we can use 
$$\lim_{(x,y)\to (0,0)} f(x,y)=\lim_{(x,0)\... 
[functions] [calculus-and-analysis]
 

asked by Dominic Michaelis https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=5899 Score of 33

answered by whuber https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=91 Score of 42

8.39.2.5 Fastest way to generate   a,a , a,b , a,c , b,b , b,c , c,c   from  a,b,c

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=268651

What is the fastest way to generate  {{a,a},{a,b},{a,c},{b,b},{b,c},{c,c}}  from  l={a,b,c} ? I've tried 
... 
[list-manipulation] [permutation]
 

asked by Thrash https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=86530 Score of 16

answered by yode https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=21532 Score of 16

8.39.2.6 How do I clear all user defined symbols?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=850

Is there some way to do this other than going to  Evaluation -> Quit kernel  and firing a new one up? 
[variable-definitions] [symbols] [faq] [clear] [persistence]
 

asked by niklasfi https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=82 Score of 106

answered by Artes https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=184 Score of 106

8.39.2.7 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 136

answered by J. M.'s persistent exhaustion https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=50 Score of 116