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Re: Any better way for finding frequencies of list entries?


Needs["Statistics`DataManipulation`"];

Here is a simpler form of your approach and some other methods.

Table[{i, 
      Count[ToExpression[Characters[StringDrop[ToString[N[Pi, 57]], {2}]]], 
        i]}, {i, 0, 9}] == 
  
  Table[{i, Count[RealDigits[N[Pi, 57]][[1]], i]}, {i, 0, 9}]  == 
  
  (({#, 1}& /@ Sort[RealDigits[N[Pi, 57]][[1]]])//.{f___,{x_,k_},{x_,n_},
          e___}:>{f,{x,k+n},e}) ==
  
  Reverse /@ Frequencies[RealDigits[N[Pi, 57]][[1]]]

True

Bob Hanlon

In a message dated 2001/1/26 11:56:30 PM, doud25 at caramail.com writes:

>I want to determine the frequencies of the entries in a list of integers
>
>For example, the following piece of code seems to work with Pi: 
>pi = Join
>    [ {3}, ToExpression[Characters[StringDrop[ToString[N[Pi, 57]], {1,
>
>2}]]]]
>Table[{i, Count[pi, i]}, {i, 0, 9}]
>
>    {{0, 3}, {1, 5}, {2, 6}, {3, 9}, {4, 4}, {5, 6}, {6, 4}, {7, 5},
>    {8, 6}, {9,   9}}
>
>Question: Is there a more elegant way to do that?


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