# R: How to Use lapply() Function with Multiple Arguments

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.