# How to Fix in R: Error: attempt to apply non-function

One error you may encounter in R is:

```Error: attempt to apply non-function
```

This error usually occurs when you attempt to multiply values in R but forget to include a multiplication (*) sign.

This tutorial shares exactly how to handle this error in two different scenarios.

### Scenario 1: Resolve Error in Data Frame Multiplication

Suppose we create the following data frame in R:

```#create data frame
df <- data.frame(x=c(1, 2, 6, 7),
y=c(3, 5, 5, 8))

#view data frame
df

x y
1 1 3
2 2 5
3 6 5
4 7 8```

Now suppose we attempt to create a new column that is equals to column x multiplied by 10:

```#attempt to create new column
df\$x_times_10 <- df\$x(10)

Error: attempt to apply non-function
```

We receive an error because we forgot to include a multiplication (*) sign.

To resolve this error, we must include a multiplication sign:

```#create new column
df\$x_times_10 <- df\$x*(10)

#view updated data frame
df

x y x_times_10
1 1 3         10
2 2 5         20
3 6 5         60
4 7 8         70
```

### Scenario 2: Resolve Error in Vector Multiplication

Suppose we create two vectors in R and attempt to multiply together their corresponding elements:

```#create two vectors
x <- c(1, 2, 2, 2, 4, 5, 6)
y <- c(5, 6, 8, 7, 8, 8, 9)

#attempt to multiply corresponding elements in vectors
(x)(y)

Error: attempt to apply non-function
```

We receive an error because we did not include a multiplication sign.

To resolve this error, we must include a multiplication sign:

```#multiply corresponding elements in vectors
(x)*(y)

  5 12 16 14 32 40 54
```

Notice that no error is produced this time.