Course

Additional

Find the Statistical Mode Write to a File Format Decimal Places

Data Frames

Convert a List to a Dataframe Create an Empty Dataframe Combine Two Dataframe into One Change Column Name of a Dataframe Extract Columns From a Dataframe Drop Columns in a Dataframe Reorder Columns in a Dataframe Split Dataframe Merge Multiple Dataframes Delete Rows From Dataframe Make a List of Dataframes

Introduction

"Hello World" Program Add Two Vectors Find Sum, Mean and Product of Vector in R Programming Take Input From User Generate Random Number from Standard Distributions Sample from a Population Find Minimum and Maximum Sort a Vector

Strings

Concatenate Two Strings Find the Length of a String Check if Characters are Present in a String Extract n Characters From a String Replace Characters in a String Compare two Strings Convert Factors to Characters Trim Leading and Trailing Whitespaces

Vectors

Concatenate a Vector of Strings Check if a Vector Contains the Given Element Count the Number of Elements in a Vector Find Index of an Element in a Vector Access Values in a Vector Add Leading Zeros to Vector

Decision and Loops

Find the Factorial of a Number R Multiplication Table Check Prime Number check Armstrong Number Print the Fibonacci Sequence Check for Leap Year Check if a Number is Odd or Even in R Programming Check if a Number is Positive, Negative or Zero Find the Sum of Natural Numbers

Functions

Convert Decimal into Binary using Recursion in R Find the Factorial of a Number Using Recursion Find the Factors of a Number Fibonacci Sequence Using Recursion in R Find H.C.F. or G.C.D.Find L.C.M.Make a Simple Calculator Sum of Natural Numbers Using Recursion

R Program to Create an Empty Dataframe

Example 1: Create an Empty Dataframe in R


              
# create empty dataframe
empty_dataframe <- data.frame()

# display empty_dataframe
print(empty_dataframe)

Output


              
data frame with 0 columns and 0 rows

In the above example, we have created an empty dataframe named empty_dataframe using the data.frame() function.

Since the dataframe we created is empty, we get data frame with 0 columns and 0 rows as an output.

Example 2: Initialize Empty Vector to Create Empty Dataframe in R


              
# create dataframe with 5 empty vectors
empty_dataframe <- data.frame(Doubles = double(),
  Characters = character(),
  Integers = integer(),
  Logicals = logical(),
  Factors = factor()
)

# display structure of empty_dataframe
print(str(empty_dataframe))

Output


              
'data.frame':	0 obs. of  5 variables:
 $ Doubles   : num
 $ Characters: chr
 $ Integers  : int
 $ Logicals  : logi
 $ Factors   : Factor w/ 0 levels:
NULL

Here, we have defined the data frame named empty_dataframe as a set of empty vectors with specific class types.

We have used the str() function to see the structure of empty_dataframe.

After displaying the structure of the empty dataframe, we can see that the dataframe has 0 observations (i.e. rows), 5 variables (i.e. columns), and each of the variables are five different classes.