[R] count combined occurrences of categories

[PIKAL Petr]

Hi

structure of your data frame is not suitable for this task. 

library(reshape)
tutu.m<-melt(tutu, "nam")
table(tutu.m$nam, tutu.m$value)
    
     art deb joy mar seb lio nem tat
  da   2   3   1   4   1   1   0   0
  fr   2   2   2   3   0   1   1   1
  ya   1   2   1   0   0   1   1   0

Regards
Petr



> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Biau David
> Sent: Friday, January 11, 2013 11:55 AM
> To: r help list
> Subject: [R] count combined occurrences of categories
> 
> Dear all,
> 
> i would like to count the number of times where I have combined
> occurrences of the categories of 2 variables.
> 
> For instance, in the dataframe below, i would like to know how many
> times each author (au1, au2, au3 represent the first, second, third
> author) is associated with each of the category of the variable 'nam'.
> The position of the author does not matter.
> 
> nam <- c('da', 'ya', 'da', 'da', 'fr', 'fr', 'fr', 'da', 'ya', 'fr')
> au1 <- c('deb', 'art', 'deb', 'seb', 'deb', 'deb', 'mar', 'mar', 'joy',
> 'joy')
> au2 <- c('art', 'deb', 'mar', 'deb', 'joy', 'mar', 'art', 'lio', 'nem',
> 'mar')
> au3 <- c('mar', 'lio', 'joy', 'mar', 'art', 'lio', 'nem', 'art', 'deb',
> 'tat') tutu <- data.frame(cbind(nam, au1, au2, au3))
> 
> thanks,
> 
> David
> 	[[alternative HTML version deleted]]