[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)