4.49.1 Top new questions this week

4.49.1.1 How fast is my fidget spinner spinning? A sound experiment!

https://mathematica.stackexchange.com/questions/162303/how-fast-is-my-fidget-spinner-spinning-a-sound-experiment

 
I would like to measure how fast my 6-bladed fidget spinner spins. To do so, after giving it a hard spin, I gently touch the spinner with a wooden stirring stick to create a buzzing sound which  ...
 

- asked by Miladiouss (17 votes), answered by Miladiouss (10 votes)

4.49.1.2 Sub-packages and auto-completion

https://mathematica.stackexchange.com/questions/162386/sub-packages-and-auto-completion

 
Cross-posted on Wolfram Community 
 
 
 
I have a Mathematica application that consists of two sub-packages, corresponding to the contexts foo` (foo.m) and foo`b` (b.m).  Some of the definitions in foo.m  ...
 

- asked by Szabolcs (11 votes), answered by b3m2a1 (2 votes)

4.49.1.3 Why does Cases not find a match to the pattern using ^n_. when n is a number other than 1?

https://mathematica.stackexchange.com/questions/162559/why-does-cases-not-find-a-match-to-the-pattern-using-n-when-n-is-a-number-oth

 
I am not good in patterns in Mathematica, and so can't figure what I am doing wrong. 
 
This example works, when the exponent is 1 
 
ClearAll[y,x,n] 
Cases[{( y[x]/x)^1}, (y[x]/x )^(n_.) :> n] 
 
 
 
 
But  ...
 

- asked by Nasser (10 votes), answered by m_goldberg (9 votes)

4.49.1.4 How to make an Epilog moveable with drag and drop

https://mathematica.stackexchange.com/questions/162572/how-to-make-an-epilog-moveable-with-drag-and-drop

 
I would like to make an Epilog moveable. For example, the following code generates a Manipulate with a framed pane containing some notes.  I would like the user to be able to move those notes anywhere  ...
 

- asked by Michael McCain (8 votes), answered by Mike Honeychurch (9 votes)

4.49.1.5 Map every second element of a list

https://mathematica.stackexchange.com/questions/162334/map-every-second-element-of-a-list

 
I've loaded a CSV: 
 
Colors = Import[ 
"d:\\bitbucket\\diversity\\data\\nlcd\\nlcd-colors.csv", "CSV"] 
{{0., " 0.00000000000 0.00000000000 0.00000000000"}, {11., 
" 0.27843137255 0.41960784314  ...
 

- asked by pnz (8 votes), answered by Kuba (13 votes)

4.49.1.6 Table of precedence values for all System` symbols

https://mathematica.stackexchange.com/questions/162474/table-of-precedence-values-for-all-system-symbols

 
Has anyone created a table listing the precedences for all symbols? Also, it would be nice if there were a function that for a given precedence value or interval, returned all the symbols with that  ...
 

- asked by Carl Woll (7 votes), answered by Carl Woll (8 votes)

4.49.1.7 How to make a custom DynamicImage which support mouse wheel and show pixel value?

https://mathematica.stackexchange.com/questions/162311/how-to-make-a-custom-dynamicimage-which-support-mouse-wheel-and-show-pixel-value

 
The built-in DynamicImage just click the plus sign or minus sign to rescale the image. I have to say click is a not very good operation. Could we make the custom DynamicImage which support the mouse  ...
 

- asked by yode (7 votes), answered by M.R. (3 votes)