How to write loops in the R language?

In R language, there are several types of loop statements that can be used.

1. For loop: execute a code block once for each element in a sequence.

for (变量 in 序列) {
  # 执行的代码块
}

1. While loop: The code block will keep executing as long as the given condition is true.

while (条件) {
  # 执行的代码块
}

1. Repeat loop: It will continue to loop indefinitely until a break statement is encountered.

repeat {
  # 执行的代码块
  if (条件) {
    break
  }
}

Below are some examples of loop statements:

1. Example of a for loop:

for (i in 1:5) {
  print(i)
}

Output:

1
2
3
4
5

1. Example of a while loop:

x <- 1
while (x <= 5) {
  print(x)
  x <- x + 1
}

The output is as follows:

1
2
3
4
5

1. Example of a repeat loop:

x <- 1
repeat {
  print(x)
  x <- x + 1
  if (x > 5) {
    break
  }
}

Output result:

1
2
3
4
5

Note: When using loop statements, it is important to carefully control the loop conditions and the logic for exiting the loop to avoid infinite loops or prematurely breaking out of the loop.