tmp$comp <- [EMAIL PROTECTED] ?! Gregor Gorjanc wrote:
>Hello! > >I am developing a composition class, which represents a composition of >mixture of levels, say soil has three components and each component >accounts for 1/3 of the unit. I have tried with S4 class system and I >would appreciate any help here. I was hoping that I would be able to >include instance of my class into a data.frame. However, I encounter >problems. > >Simple definition of class could be > >setClass(Class="composition", > representation=representation(ratios="matrix")) > >n <- 2 >k <- 3 > >x <- new(Class="composition", ratios=matrix(data=rep(x=1/3, times=n*k), >nrow=n, ncol=k)) > >x >An object of class "composition" >Slot "ratios": > [,1] [,2] [,3] >[1,] 0.3333333 0.3333333 0.3333333 >[2,] 0.3333333 0.3333333 0.3333333 > >tmp <- data.frame(id=1:2) >tmp$comp <- x >Error: object is not subsettable > >As I understand this, my problem is that x is of length 1 as the >following works > >tmp$comp <- c(x, x) > >although I am not able to print tmp now > >tmp >Error in unlist(x, recursive, use.names) : > argument not a list > >but this is expected as I (probably) need show/print method for this. >How can I put my class into data.frame or how can I make my class behave >as a vector? > >Thanks! > > > -- Ferdinand Alimadhi Programmer / Analyst Harvard University The Institute for Quantitative Social Science (617) 496-0187 [EMAIL PROTECTED] www.iq.harvard.edu ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
