How to get Last N Items from a Vector in R - Step by Step Examples

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How to get Last N Items from a Vector in R ?

Answer

To get the last N items from a vector in R, you can use array indexing in combination with the `length` function.

✐ Examples

1 Get Last N Items from Vector

In this example,

First, you define a vector containing the elements from which you want to retrieve the last N items.
Next, you calculate the starting index for the last N items by subtracting N from the length of the vector plus one.
Finally, you retrieve the elements using the calculated starting index to the end of the vector.

R Program

# Define a vector containing elements
vector <- c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

# Specify the number of items to retrieve (N)
N <- 5

# Calculate the starting index for the last N items
start_index <- length(vector) - N + 1

# Retrieve the last N items from the vector
last_N_items <- vector[start_index:length(vector)]

# Print the last N items
print(last_N_items)

Output

[6, 7, 8, 9, 10]

2 Get Last Three Items from Character Vector

In this example,

Define a character vector containing strings.
Calculate the starting index for the last three items by subtracting three from the length of the character vector plus one.
Retrieve the last three items using the calculated starting index to the end of the character vector.

R Program

# Define a character vector
char_vector <- c("apple", "banana", "orange", "grape", "kiwi")

# Calculate the starting index for the last three items
start_index <- length(char_vector) - 2

# Retrieve the last three items from the character vector
last_three_items <- char_vector[start_index:length(char_vector)]

# Print the last three items
print(last_three_items)

Output

[orange, grape, kiwi]

Summary

In this tutorial, we learned How to get Last N Items from a Vector in R language with well detailed examples.

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How to get Last N Items from a Vector in R - Step by Step Examples

How to get Last N Items from a Vector in R ?

Answer

✐ Examples

1 Get Last N Items from Vector

R Program

Output

2 Get Last Three Items from Character Vector

R Program

Output

Summary

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