Hi all,
I would like to use an object and to add some definition to the [
function, but I do not manage...
My objet is a "trajectories", a matrix whose columne name does contain
information :
---------
trajectories <- function(traj,varName,time){
colnames(traj) <- paste(varName,time,sep="")
class(traj) <- c("trajectories","matrix")
return(traj)
}
x <- trajectories(traj=matrix(1:12,4),varName="T",time=c(1,2,4))
--------------
Then I would like to define the [ operator in the following way :
---------------
> x["varName"]
[1] "T"
> x["time"]
[1] 1 2 4
> x[1,]
1 5 9
> x[,1]
1 2 3 4
----------------
For that, I write:
----------------
"[.trajectories" <- function(traj,slot,...){
if(slot=="varName"){return(gsub("(\\d+)$","",colnames(traj)[1],perl=T))}else{}
if(slot=="time"){return(as.numeric(gsub("(^.+\\D)(\\d+$)","\\2",colnames(traj),perl=T)))}else{}
NextMethod()
}
----------------
The ["varName"],["time"] and [1,] work fine, but not [,1]
Any idea of what is wrong and how to correct?
Thanks
Christophe
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