Try looking at 'prev' (it is a matrix) and then reading ?predict.rpart to see why. My guess is that you intended type="class".
On Thu, 14 Feb 2008, Carla Rebelo wrote: > Hello! > > May you help me? I'm trying to do a contingency table using this > > > data(iris) > > library(rpart) > > modelo <- rpart(Species ~., iris) > > prev <- predict(modelo, iris) > > Finally the contingency table > > table(iris$Species, prev) > But an error occurs: > Error in table(iris$Species, prev) : > all arguments must have the same length > > And I do not understand why, may you help me? > > Thank You! > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
