R Functions: Define & Call in R Language

In the R language, a function can be defined and called using the following steps:

1. purpose

function_name <- function(arg1, arg2, ...) {
  # 函数体
}

The function_name is the name of the function, arg1, arg2, … are the parameters of the function, and the function body (#) is the main part of the function, containing the operations the function will perform.

1. Calling a function: Use the defined function name and parameters to call the function, with the syntax as follows:

result <- function_name(value1, value2, ...)

The function_name is the name of the function, and value1, value2, … are the specific values of the function’s parameters, with result being the outcome of the function execution.

For example, defining a simple function to calculate the sum of two numbers:

add_numbers <- function(x, y) {
  result <- x + y
  return(result)
}

Next, call this function.

result <- add_numbers(3, 5)
print(result)

This will output the result 8, indicating that the function add_numbers calculates the sum of 3 and 5 as 8.