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a <- 3     
b <- 1.6 

grade <- c(5,3)

name <- c ("小貓","小狗")

str(name)

##  chr [1:2] "小貓" "小狗"

frame <- data.frame(Student_ID=c(1,2,3,4,5),
                  name=c("劉", "王", "李", "陳", "鄭"),
                  score=c(80,36, 88.9, 97.5, 60))
frame        # data frame的型態

##   Student_ID name score
## 1          1   劉  80.0
## 2          2   王  36.0
## 3          3   李  88.9
## 4          4   陳  97.5
## 5          5   鄭  60.0

frame$score

## [1] 80.0 36.0 88.9 97.5 60.0

a <- matrix(c(1:6), nrow=3, ncol=2)