Beginners Guide to R – R Repeat Loop

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R Repeat Loop

repeat loop just repeats a block of code indefinitely. In this loop, no condition checking is performed in order to end the loop.

To stop repeating the loop, you must put a condition explicitly inside it with break statement. Failing to do so will create an infinite/endless loop.

Syntax

Here’s the syntax of the repeat loop:

r repeat loop syntax

Examples

A repeat loop without a break statement results into an infinite/endless loop.

# infinite loop
repeat {
  print("Press Esc to stop me!")
}
[1] "Press Esc to stop me!"
[1] "Press Esc to stop me!"
...
...

However, you can put a condition explicitly inside the body of the loop and use the break statement to exit the loop.

# Iterate until x becomes 5
x <- 1
repeat {
  print(x)
  if (x > 4)
    break
  x <- x + 1
}
[1] 1
[1] 2
[1] 3
[1] 4
[1] 5

 

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