# R Program to create a dataframe
  
# Creating a Data Frame 
df<-data.frame(row1 = 0:2, row2 = 3:5, row3 = 6:8) 
print(df)

  row1 row2 row3
1    0    3    6
2    1    4    7
3    2    5    8

mean1 = mean(df)
print(mean1)

# Converting dataframe to matrixa
as.matrix(df)

# Finding mean of the dataframe
  
# Using mean() function
mean(as.matrix(df))

4

# R program to illustrate dataframe 
Roll_num = c(01, 02, 03)
Age = c(22, 25, 45)
Marks = c(70, 80, 90)
    
# To create dataframe use data.frame command and 
# then pass each of the vectors  
# we have created as arguments 
# to the function data.frame() 
df = data.frame(Roll_num, Age, Marks) 
    
print(df)

# Computing mean of the above dataframe
  
# Using the mean() function
mean(as.matrix(df))

37.5555555555556

# R program to illustrate dataframe 
ID = c(01, 02, 03)
Age = c(25, 30, 70)
Salary = c(70000, 85000, 40000)
    
# To create dataframe use data.frame command and 
# then pass each of the vectors  
# we have created as arguments 
# to the function data.frame() 
df = data.frame(ID, Age, Salary) 
    
print(df)

# Computing mean of the dataframe
  
# Using mean() function
mean(as.matrix(df))

21681.2222222222