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 Access Values in a Vector

Example 1: Access Vector Element in R

In R, we can access elements of a vector using the index number (1, 2, 3 …). For example,


              
# a vector of string type
languages <- c("Swift", "Java", "R")

# access first element of languages
print(languages[1])  # "Swift"

# access third element of languages
print(languages[3]). # "R"

In the above example, we have created a vector named languages. Each element of the vector is associated with an integer number.

Here, we have used the vector index to access the vector elements

languages[1] - access the first element "Swift"
languages[3] - accesses the third element "R"

Note: In R, the vector index always starts with 1. Hence, the first element of a vector is present at index 1, second element at index 2 and so on.

Example 2: Access Multiple Vector Element in R


              
# a vector of string type
languages <- c("Swift", "Java", "R")

# access 1st and 3rd element of languages
print(languages[c(1,3)])  # "Swift" "R"

Output


              
[1] "Swift" "R"

Here, we have combined two indices using the c() function to access two vector elements at once.


              
languages[c(1,3)]

The code above accessed and returns 1st and 3rd element of languages.