Hello, my name is Xavier I'm student of UPC in Barcelnoa and I've read your R-help about tune.svm and i have the same problem. Have you solved the problem?? Do you know how tune.svm works?? Do you know why it's different from svm?? https://stat.ethz.ch/pipermail/r-help/2005-August/077427.html Thank you [[alternative HTML version deleted]]