Vector, Array, list, and Data Frame in the R language

1.Vector

All elements must be of the same type. For example, the following code creates 2 vectors.

name<-C("Mike.", "Lucy", "John")
Age<-C( -,  -,  -)

2.Array & Matrix

Matrix is a special kind of vector. Maxtrix is a vector with two additional attributes: the number of rows and columns.

>x<-Matrix(C(1,2,3,4),Nrow=2,Ncol=2)
>x
[,1] [,2]
[1,]    1    3
[2,]    2    4

Similar to Maxtrix, but arrays can be more than two-dimensional.

3.List

List can contain different types of elements

>y<-List(name="Mike.",Gender="M", Company="Programcreek")
>y
$name
[1] "Mike."
$gender
[1] "M"
$company
[1] "Programcreek"

4.Data Frame

The data frame is used to store the datasheet, which is a list of vectors that have equal lengths. For example, create a data frame with the following code.

>name<-C("Mike.", "Lucy", "John")
> Age<-C( -,  -,  -)
>Student<-C(TRUE,FALSE,TRUE)
>DF=Data.Frame(name, Age,Student)
>DF
Name Age Student
1 Mike   -TRUE
2 Lucy   -FALSE
3 John   -TRUE

Vector, Array, list, and Data Frame in the R language