R语言基本操作 列表创建 创建列表 列表取值 lst < list(name= Donald, age=69, gender IstsgradeSmath factor("male"), grade data frame(math =90 [1]90 English =91)) >Ist[[4J]Smath [1]90 name 1 Donald 列表赋值 >lstsgender <-factor("male, levels =c(“ female",“male")#更改 Tlevels [1]69 IstSgrade <-data frame(lstSgrade 1] male biology=89)#给数据框增加一列 Levels: male math english 19091R语言基本操作 列表创建 创建列表 > lst <- list(name = "Donald", age = 69, gender = factor("male"), grade = data.frame(math = 90, English = 91)) > lst $name [1] "Donald" $age [1] 69 $gender [1] male Levels: male $grade math English 1 90 91 列表取值 > lst$grade$math [1] 90 > lst[[4]]$math [1] 90 列表赋值 >lst$gender <- factor(“male”, levels = c(“female”, “male”)) #更改levels >lst$grade <- data.frame(lst$grade, biology = 89) #给数据框增加一列