代码:
library(rpart.plot)
(a=rpart(V281~.,w))
rpart.plot(a,type=2)
library(randomForest)
set.seed(10)
a=randomForest(V281~.,w,importance=TRUE,proximity=TRUE)

names(a)
par(mfrow=c(1,1));barplot(a$importance[,1],main="IncMSE")
barplot(a$importance[,2],main="IncNodePurity")



请问:图中横坐标刻度太大,能不能把刻度变小,便于精确地确认变量.谢谢各位!