Problem 38. Return a list sorted by number of occurrences
Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x.
Ties are resolved by a sort from lowest to highest.
So if
 x = [1 2 2 2 3 3 7 7 93]
then
 y = [2 3 7 1 93]
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- 
		2 Comments
		Chul Min Yeum
    	on 3 Jan 2020
	
	
  	Good problem!
		Ahmed Nazir
    	on 30 Sep 2020
	
	
  	It is easy if you use matlab function...
useful function ==> categorical, countcats , sort, unique
solution:
https://github.com/AhmedNazir/MatlabCody/blob/master/popularity.m
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