To calculate euclidean distance in R, you can declare function manually.

The following method shows how you can do it with syntax.

**Method: Declare Function**

```
euclidean <- function(x1, x2) {
sqrt(sum((x1 - x2)^2))
}
```

The following example shows how to calculate euclidean distance in R.

## Calculate Euclidean Distance

Let’s see how to calculate euclidean distance between two vector in R:

```
# Declare euclidean function
euclidean <- function(x1, x2) {
sqrt(sum((x1 - x2)^2))
}
# Declare vector
a <-c(78,85,89,96,74,75)
b <-c(65,66,64,69,70,61)
# Calculate euclidean distance
d <- euclidean(a,b)
# Show euclidean distance
print(d)
```

Output:

```
[1] 45.78209
```

As the output shows euclidean distance between two vectors that we declare in above code.