3.17.3 Can you answer these questions?

3.17.3.1 Counting the occurences of entries in a dataset columnwise

http://mathematica.stackexchange.com/questions/129459/counting-the-occurences-of-entries-in-a-dataset-columnwise

 
Consider a dataset with some rows and considerably less columns (eg something like 10x3). Assume that the contents of the dataset cells are integers from some conveniently chosen range (eg 1 through  ...
 

- asked by user42582 1vote

3.17.3.2 List, Association, and Dataset, according to what principles to choose which one to use?

http://mathematica.stackexchange.com/questions/129081/list-association-and-dataset-according-to-what-principles-to-choose-which-one

 
List, Association and Dataset are three 'objects' that can be used to store data in MMA. So when or under what conditions for one to decide to use each of them?
 

- asked by Alexander Zeng 2votes

3.17.3.3 How to ArrayFlatten some matrix which have repeated element

http://mathematica.stackexchange.com/questions/129153/how-to-arrayflatten-some-matrix-which-have-repeated-element

 
I have many such matrices(whose dimension are all 3*3.) like: 
 
list1={{0,3,0},{4,1,2},{0,5,0}}; 
list2={{0,6,0},{1,2,8},{0,7,0}}; 
list3={{0,1,0},{9,5,7},{0,11,0}}; 
list4={{0,2,0},{5,7,10},{0,12,0}}; 
 
 
...
 

- asked by yode 3votes

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