# declaring a data frame with 2 columns and
# declaring data type of both the columns 
data_frame <- data.frame(col1 = character(0), col2 = numeric(0))
  
# printing data frame
print ("Data Frame : ")
print (data_frame)

[1] “Data Frame : “

[1] col1 col2

<0 rows> (or 0-length row.names)

# declaring an empty data frame
data_frame1 <- data.frame(col1=NA, col2=NA, col3=NA, col4=NA)
[numeric(0), ]
  
# printing data frame
print ("Data Frame :")
print (data_frame1)

[1] “Data Frame : “

[1] col1 col2 col3 col4

<0 rows> (or 0-length row.names)

# declaring a data frame with 2 columns
# and declaring data type of both the 
# columns 
mat <- matrix(NA, nrow = 5, ncol = 2)
  
# converting matrix to data frame
data_frame <- data.frame(mat)
  
# printing data frame
print ("Data Frame : ")
print (data_frame)
  
# printing dimensions
dim(data_frame)

[1] “Data Frame : “

X1 X2

1 NA NA

2 NA NA

3 NA NA

4 NA NA

5 NA NA

[1] 5 2