[R] Count cell Count by her frequency

[David L Carlson]

You request is not completely clear. I am assuming you want to count the
number of different characters in B for each category in A:

> A <- c("10-1", "10-1", "10-1", "10-2", "10-3")
> B <- c("aaa", "bbb", "abc", "vvv", "ggg")
> dta <- data.frame(A, B)
> dta
     A   B
1 10-1 aaa
2 10-1 bbb
3 10-1 abc
4 10-2 vvv
5 10-3 ggg
> a1 <- tapply(dta$B, dta$A, paste0, collapse="")
> a2 <- strsplit(a1, "")
> a3 <- lapply(a2, unique)
> a4 <- sapply(a3, length)
> dtanew <- data.frame(A=names(a4), B=a4, row.names=1:length(a4))
> dtanew
     A B
1 10-1 3
2 10-2 1
3 10-3 1

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Mat
> Sent: Monday, December 10, 2012 2:50 AM
> To: r-help at r-project.org
> Subject: [R] Count cell Count by her frequency
> 
> Hello togehter, i have a data.frame, with value like this:
> 
>         A       B
> 1     10-1  aaa
> 2     10-1  bbb
> 3     10-1  abc
> 4     10-2  vvv
> 5     10-3  ggg
> 
> I want now a evaluation, which character is how often in my data.frame.
> Like
> this one:
>      A         B
> 1   10-1   3
> 2   10-2   1
> 3   10-3   1
> 
> How can i do this?
> 
> Thank you.
> 
> Mat
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Count-cell-
> Count-by-her-frequency-tp4652650.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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