问题描述
如何修改通过将 ggplot 应用于使用 Ranger 算法构建的插入符号对象生成的默认图例?例如,假设我希望图例标题为“拆分算法”,而不是默认的“拆分规则”。
library(caret)
trainIndex <- createDataPartition(iris$Species,p = 0.80,list = FALSE)
train <- iris[ trainIndex,]
test <- iris[-trainIndex,]
rfs <- train(Species ~ .,data = train,trControl = trainControl(method = "cv",number = 10),method = "ranger",tuneGrid = expand.grid(mtry = seq(1,3,1),splitrule = c("gini","extratrees"),min.node.size = 1))
ggplot(rfs) +
xlab("Number of parameters") +
ylab("Accuracy") +
theme(legend.title = "Splitting algo")