(R) data.frame function / Way to make data frame 데이터 프레임 만들기 R

Way to make a data frame 

data fame is mostly used data structure which consists of columns(Variables) and rows(Cases)

1st way to make a data frame 

> student<-c("Jane","Dora","Beth","Park")        

> class<-c(1,3,2,2)

> height<-c(153,172,165,180)

 

> height_of_students<-data.frame(student,class,height)

> height_of_students

  student class height

1    Jane     1    153

2    Dora     3    172

3    Beth     2    165

4    Park     2    180

'height_of_students' become the data frame which consists of 3 variables ('students,' 'class,' 'height') and 4 cases.

2nd way to make a data frame ( ※ stringsAsFactor=F)

> final_score<-data.frame(student=c("Jane","Dora","Beth","Park"),math=c(70,90,50,100), science=c(90,30,80,100),stringsAsFactors = F)

> final_score

  student math science

1    Jane   70      90

2    Dora   90      30

3    Beth   50      80

4    Park  100     100

'final_score' becomes the data frame which consists of 3 variables('student,' 'math,' 'science,') and 4 cases('Jane,' 'Dora,' 'Beth,' 'Park') 

[R] - Interpret data frame/ summary(), typeof(), str(), class(),View(),names(),ncol(),length(),nrow(),dim()