Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2001
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2001

[Date Index] [Thread Index] [Author Index]

Search the Archive

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26951] Re: [mg26923] Any better way for finding frequencies of list entries?
  • From: BobHanlon at aol.com
  • Date: Sat, 27 Jan 2001 20:00:15 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

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?


  • Prev by Date: Re: Multiple choice question
  • Next by Date: Re: Multiply 2 Lists together in a certain way
  • Previous by thread: Any better way for finding frequencies of list entries?
  • Next by thread: RE: Any better way for finding frequencies of list entries?