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?