第一章 实用R内置数据进行数据处理--笔记

x1<-c(2.5,1.4,6.3,4.6,9.0)

class(x1)mode(x1)length(x1)x2<-c(TRUE,FALSE,TRUE,FALSE,FALSE)class(x2)mode(x2)x3<-c("DataMining","Statistics","Analytics","Projects","MachineLearning")class(x3)length(x3) a <- c('Male','Male','Female','Female','Male','Male',+ 'Male','Female','Male','Female')mode(a)factor(a)x<-data.frame(x1,x2,x3)class(x)

[1] "data.frame"

print(x)

   x1    x2              x3
1 2.5  TRUE      DataMining
2 1.4 FALSE      Statistics
3 6.3  TRUE       Analytics
4 4.6 FALSE        Projects
5 9.0 FALSE MachineLearning

ls()

 [1] "a"          "airquality" "f"          "fit"        "q"         
 [6] "x"          "x1"         "x2"         "x3"         "y"