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...is 2 ways to write classes, using S3 ou S4 models. And it seems that S4 is the best model, so I thing I should use this one. I´m new user of R and I´m searched on the net some information about creating new classes. I found this document: http://www.biostat.harvard.edu/courses/individual/bio271/lectures/L11/S4Objects.pdf If someone knows some docs about creating our own classes, could please, post its url at here ? More one question... It seems that some documents about S can be applyed to R. How do you know if you can use this documentation using R ? I´m asking this because some stufs I was...