R Tutorial

Fundamentals of R

Variables

Input and Output

Decision Making

Control Flow

Functions

Strings

Vectors

Lists

Arrays

Matrices

Factors

DataFrames

Object Oriented Programming

Error Handling

File Handling

Packages in R

Data Interfaces

Data Visualization

Statistics

Machine Learning with R

List of Vectors in R

In R, a list is a versatile data structure that can contain multiple objects of different types. A common use case is a list of vectors. Here's a tutorial on how to work with a list of vectors in R:

1. Creating a List of Vectors:

Let's create three sample vectors and put them in a list:

vec1 <- c(1, 2, 3)
vec2 <- c("apple", "banana", "cherry")
vec3 <- c(TRUE, FALSE, TRUE)

list_of_vecs <- list(vec1, vec2, vec3)

2. Accessing Vectors in the List:

You can access vectors in the list by their index:

list_of_vecs[[2]] # This accesses vec2

3. Naming the Vectors:

You can assign names to the vectors in the list for easier access:

names(list_of_vecs) <- c("Numbers", "Fruits", "Booleans")
list_of_vecs$Fruits  # This accesses vec2

4. Applying Functions to Each Vector:

Use the lapply() function to apply a function to each element of the list:

# Get the length of each vector in the list
lengths <- lapply(list_of_vecs, length)

5. Modifying a Vector:

You can modify vectors in the list like this:

list_of_vecs$Numbers <- c(list_of_vecs$Numbers, 4)  # Adds the number 4 to vec1

6. Adding a Vector to the List:

You can easily add a new vector to the list:

vec4 <- c(4.5, 5.5, 6.5)
list_of_vecs$Decimals <- vec4

7. Removing a Vector from the List:

You can set the vector's value to NULL to remove it:

list_of_vecs$Numbers <- NULL

8. Iterating Over the List:

You can use loops to iterate over each vector in the list:

for(vec_name in names(list_of_vecs)) {
  print(paste("Vector:", vec_name))
  print(list_of_vecs[[vec_name]])
}

9. Converting a List of Vectors to a Dataframe:

If all vectors in the list have the same length, you can convert the list to a dataframe:

df <- as.data.frame(list_of_vecs)

Conclusion:

Lists in R allow for structured data storage and operations on collections of vectors. Whether you're organizing related vectors, performing batch operations, or preparing data for analysis, lists offer a flexible and efficient data structure to work with in R.

Creating a list of vectors in R:

Overview: Learn how to create a list containing multiple vectors.

Code:

# Creating a list of vectors
vector1 <- c(1, 2, 3)
vector2 <- c(4, 5, 6)
vector_list <- list(vector1, vector2)

# Display the list of vectors
print("List of Vectors:")
print(vector_list)

Manipulating lists of vectors in R:

Overview: Explore common operations on lists of vectors, such as subsetting and modification.

Code:

# Accessing and modifying elements in the list
vector_list[[1]][2] <- 20

# Display the modified list of vectors
print("Modified List of Vectors:")
print(vector_list)

R combine vectors into a list:

Overview: Learn different methods to combine existing vectors into a list.

Code:

# Combining vectors into a list
vector3 <- c(7, 8, 9)
combined_vector_list <- list(vector1, vector2, vector3)

# Display the combined list of vectors
print("Combined List of Vectors:")
print(combined_vector_list)

Accessing elements in a list of vectors in R:

Overview: Understand how to access specific vectors within a list.

Code:

# Accessing specific vector in the list
vector_subset <- combined_vector_list[[2]]

# Display the accessed vector
print("Accessed Vector:")
print(vector_subset)

Appending vectors to a list in R:

Overview: Learn how to add new vectors to an existing list.

Code:

# Appending a new vector to the list
vector4 <- c(10, 11, 12)
combined_vector_list <- c(combined_vector_list, list(vector4))

# Display the updated list of vectors
print("Updated List of Vectors:")
print(combined_vector_list)

R lapply with list of vectors example:

Overview: Use lapply to apply a function to each vector in a list.

Code:

# Applying a function to each vector in the list
modified_vector_list <- lapply(combined_vector_list, function(vec) {
  vec * 2
})

# Display the modified list of vectors
print("Modified List of Vectors:")
print(modified_vector_list)

Converting list of vectors to a single vector in R:

Overview: Combine all vectors in a list into a single vector.

Code:

# Converting list of vectors to a single vector
combined_vector <- unlist(combined_vector_list)

# Display the combined vector
print("Combined Vector:")
print(combined_vector)

R split vector into a list of vectors:

Overview: Learn how to split a vector into a list of vectors based on a specific criterion.

Code:

# Splitting a vector into a list of vectors
split_vector_list <- split(combined_vector, rep(1:2, each = 3))

# Display the split list of vectors
print("Split List of Vectors:")
print(split_vector_list)