A for loop is a control structure that allows you to repeat a block of code a certain number of times. The syntax for a for loop in R is as follows:
for (variable in sequence) {
# code block to be executed
}
The `variable` in the for loop is an iterator variable that will be assigned successive values from the `sequence`. The `sequence` can be a vector, a list, or a range of numbers.
For example, the following code will print the numbers from 1 to 10:
for (i in 1:10) {
print(i)
}
The `i` variable will be assigned the values 1, 2, 3, ..., 10 in each iteration of the loop. The code block within the curly braces will be executed for each value of `i`.
For loops are a powerful tool for iterating over data in R. They can be used to process data, calculate statistics, and generate output.
Note
- The `sequence` in a for loop can be any iterable object. This includes vectors, lists, ranges, and even other for loops.
- The `code block` in a for loop can be any valid R code. This includes expressions, statements, and even other functions.
- The `for` loop will continue to execute until the `sequence` is exhausted. If you want to stop the loop early, you can use the `break` statement.
