Computes the distance between two landmarks as the square root of the sum of the squared differences between each coordinate (Claude, 2008).

## Arguments

- x
An object computed with

`landmarks()`

.

## Examples

```
if(isTRUE(interactive())){
library(pliman)
img <- image_pliman("potato_leaves.jpg")
x <- landmarks(img)
landmarks_dist(x)
}
```