I am using rpart to build a model for later predictions. To save the prediction across restarts and share the data across nodes I have been using "save" to persist the result of rpart to a file and "load" it later. But the saved size was becoming unusually large (even with binary, compressed mode). The size was also proportional to the amount of data that was used to create the model.
After tinkering a bit, I figured out that most of the size was because of the rpart$functions attribute. If I set it to NULL, the size seems to drop dramatically. It can be seen with the following lines of R code, where there is a difference, though it is small. The difference is more pronounced with large datasets. library(rpart) fit <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis) save(fit, file="fit1.sav") fit$functions <- NULL save(fit, file="fit2.sav") What is the reason behind it? The functions themselves seem small, so where it all the bulk coming from? Thanks, Tan ______________________________________________ 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.
