Nothing
".as.area" <- function(x)
{
## Verifications
if (!inherits(x, "data.frame"))
stop("x should be of class \"data.frame\"")
if (ncol(x) != 3)
stop("x should have three columns")
## ID is again transormed into a factor
if (!is.factor(x[,1]))
x[,1] <-factor(x[,1])
## The class
class(x)<-c("area", "data.frame")
return(x)
}
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