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How to Iterate Over a List in Reverse Order in R - Step by Step Examples

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How to Iterate Over a List in Reverse Order in R ?

Answer

To iterate over a list in R in reverse order, you can use the rev() function.

✐ Examples

1 Iterate Over List in Reverse Using rev()

In this example,

We create a vector named numbers with numeric elements.
We use the rev() function to iterate over the vector in reverse order.
Within the loop, we perform operations on each element or print it.

R Program

numbers <- c(1, 2, 3, 4, 5)
for (number in rev(numbers)) {
  print(number)
}

Output

2 Iterate Over List in Reverse Using for Loop

In this example,

We create a list named names with string elements.
We use a reverse for loop to iterate over the list in reverse order.
Within the loop, we perform operations on each element or print it.

R Program

names <- c("Alice", "Bob", "Charlie", "David")
for (i in length(names):1) {
  print(names[i])
}

Output

David
Charlie
Bob
Alice

Summary

In this tutorial, we learned How to Iterate Over a List in Reverse Order in R language with well detailed examples.

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