The **lapply()** function in R can be used to apply a function to each element of a list, vector, or data frame and obtain a **list** as a result.

To use the **lapply()** function with multiple arguments, you can use the following basic syntax:

#define function my_function <- function(var1,var2,var3){ var1*var2*var3 } #apply function to list using multiple arguments lapply(my_list, my_function, var2=3, var3=5)

The following example shows how to use this syntax in practice.

**Example: How to Use lapply() with Multiple Arguments in R**

Suppose we have the following list in R:

#create a list my_list <- list(A=1, B=2, C=3, D=4) #view list my_list $A [1] 1 $B [1] 2 $C [1] 3 $D [1] 4

The following code defines a function that accepts three variables and multiplies all three variables together, then uses the **lapply()** function to apply this function to each value in our list:

#define function my_function <- function(var1,var2,var3){ var1*var2*var3 } #apply function to list using multiple arguments lapply(my_list, my_function, var2=3, var3=5) $A [1] 15 $B [1] 30 $C [1] 45 $D [1] 60

Notice that the **lapply()** function multiplies each value in the list by 3 and then by 5.

For example:

- First value in list: 1 * 3 * 5 = 15
- Second value in list: 2 * 3 * 5 = 30
- Third value in list: 3 * 3 * 5 = 45
- Fourth value in list: 4 * 3 * 5 = 60

Using similar syntax, you can supply as many arguments as you’d like to the **lapply()** function.

**Additional Resources**

The following tutorials explain how to perform other common tasks in R:

How to Apply Function to Each Row of Data Frame in R

How to Use colSums() Function in R

How to Use rowSums() Function in R