In R, there are two ways to add comments to your code. The first and most common method is to use the '#' symbol. Any text that comes after the '#' symbol on that line will be ignored by R.
For example:
# This is a comment. It is being ignored by R.
x <- 5 # This line of code assigns the value 5 to the variable x.
The second method for adding comments in R is to use multi-line comments enclosed in /* and */. This method makes it easy to add comments across multiple lines of code.
For example:
/*
This is a multi-line comment.
It can span across multiple lines of code.
*/
x <- 5 # This line of code assigns the value 5 to the variable x.
Both of these methods are useful for adding explanations or notes to your code, which can help you or others understand your code better.