R Program to Create and Access Elements of a Vector

Introduction

Vectors are one of the most basic data structures in R, used to store a sequence of elements of the same type. This guide will walk you through writing an R program to create a vector and access its elements.

Problem Statement

Create an R program that:

• Creates a vector with a sequence of elements.
• Accesses and displays specific elements of the vector.

Example:

• Input: A vector with elements 1, 2, 3, 4, 5
• Output: Elements at specific positions, such as the 2nd and 4th elements.

Solution Steps

1. Create a Vector: Use the c() function to create a vector with a sequence of elements.
2. Access Elements of the Vector: Use indexing to access specific elements of the vector.
3. Display the Accessed Elements: Use the print() function to display the elements retrieved from the vector.

R Program

# R Program to Create and Access Elements of a Vector
# Author: https://www.javaguides.net/

# Step 1: Create a vector with a sequence of elements
my_vector <- c(1, 2, 3, 4, 5)

# Step 2: Access specific elements of the vector
second_element <- my_vector[2]
fourth_element <- my_vector[4]

# Step 3: Display the accessed elements
print(paste("Second element:", second_element))
print(paste("Fourth element:", fourth_element))

Explanation

Step 1: Create a Vector

• The c() function is used to create a vector with the elements 1, 2, 3, 4, 5.

Step 2: Access Specific Elements

• Vectors in R are 1-indexed, meaning that the first element is accessed with index 1.
• my_vector[2] retrieves the second element of the vector.
• my_vector[4] retrieves the fourth element of the vector.

Step 3: Display the Accessed Elements

• The print() function is used to display the retrieved elements along with a descriptive message.

Output Example

Example:

[1] "Second element: 2"
[1] "Fourth element: 4"

Conclusion

This R program demonstrates how to create a vector and access specific elements by indexing. It covers basic operations such as vector creation and element retrieval, making it an essential example for beginners learning R programming.