What is the difference between class and typeof function in R?
The class function in R helps us to understand the type of object, for example the output of class for a data frame is integer and the typeof of the same object is list because data frames are stored as list in the memory but they are represented as a data frame. Check out the below examples with multiple type of objects to understand the differences.
Example1
Live Demo
x1<-rpois(20,2)
typeof(x1)
Output
[1] "integer"
class(x1)
[1] "integer"
df1<-data.frame(x1)
df1
x1
1 1
2 4
3 1
4 0
5 2
6 2
7 4
8 2
9 3
10 4
11 1
12 4
13 0
14 5
15 2
16 2
17 0
18 4
19 3
20 3
typeof(df1)
[1] "list"
class(x1)
[1] "integer"
Example2
Live Demo
M<-matrix(rnorm(40),ncol=2)
M
Output
[,1] [,2]
[1,] 2.02437789 -0.9161853
[2,] -0.60108978 -0.8972007
[3,] 1.27916953 0.1017923
[4,] 1.06998017 1.4839931
[5,] 0.22298522 0.6160919
[6,] -0.29346341 -0.3975116
[7,] 2.07012097 -0.7900820
[8,] 0.36719470 -0.1100298
[9,] -0.69522122 -1.9198172
[10,] 2.07822428 0.2517532
[11,] -1.56267422 1.8295022
[12,] -1.07488221 1.2666054
[13,] -0.79381494 -1.0993693
[14,] -0.16027224 -1.1814177
[15,] 0.67561791 0.7309281
[16,] -1.40912018 -0.3307749
[17,] -0.77769513 0.5527600
[18,] 0.47050704 0.1075593
[19,] -0.46616151 -0.5079660
[20,] -0.01944371 0.1553333
typeof(M)
[1] "double"
class(M)
[1] "matrix" "array"
Published on 06-Mar-2021 13:14:20
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