Nothing
as.mlcm.df <- function(d, ...){
if (!inherits(d, "data.frame"))
stop("Object must have class data.frame!\n")
if((length(d) < 5) || !(length(d) %% 2))
stop("Data frame must be at least 5 columns and have an odd number of columns!\n")
class(d) <- c("mlcm.df", "data.frame")
d
}
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