lg21c

I got it，thank you

**In contrast：** library(rpart.plot) library(rpart) train

**what is the default value of weights?** library(rpart.plot) library(rpart) train

> @A-Pai most of what you’re asking is explained in the associated vignette, which you can find on the CRAN landing page [here](https://cran.r-project.org/web/packages/rpart/vignettes/longintro.pdf). Thank you for your guidance，but is it...

> primary splits look at each of the listed variables and describes how well they do at improving the node purity. surrogate splits are for when there are missing values....

the tree growed by the code： 

What's the trouble？What should I do？

> Hi @A-Pai and @jrast for the feedback, I'm not being able to reproduce this. Could you guys submit a GIF or video to understand better what you refer to...

> Thanks for the video @A-Pai ! Something strange is happening there indeed. Did you install Spyder with pip? yes，I upgrade it by pip，conda cannot upgrade it

> If you mixed conda and pip packages maybe that's the source of the problem. If you use conda, could you create a new env and install there Spyder version...