[R] 简单笔记（一）

 library(lattice)

 xyplot(Petal.Length~Petal.Width,data=iris,goups = Species)//画分类图

 plot(model,subdata,Petal.Length~Petal.Width)//画模型预测图

 hist(x,col="light blue") //直方图  频率分布

 abline(rs,cars)//添加图

 factor(因子)  不作为数值参与运算

 # Create a vector as input.

 data <- c("East","West","East","North","North","East","West","West","West","East","North")

 print(data)

 print(is.factor(data))

 # Apply the factor function.

 factor_data <- factor(data)

 print(factor_data)

 print(is.factor(factor_data))

 决策树：

 ctree(formula,data)

 plot(..)

 随机森林

 library("randomForest")

 randomForest(formula,data)