In R, functions are used to organize code into reusable blocks that can be called multiple times with different inputs. You can create your own functions using the `function()` keyword, specifying parameters and the code to be executed within the function. To call a function, simply type the function name followed by the necessary arguments in parentheses. Functions can also return values using the `return()` statement, allowing you to store or display the output of the function. Additionally, you can use built-in functions in R to perform common tasks, such as math operations, data manipulation, and plotting. Overall, functions in R are essential for writing efficient and modular code.
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