# nnfromvertex

##### Nearest Data Point From Each Vertex in a Network

Given a point pattern on a linear network, for each vertex of the network find the nearest data point.

##### Usage

`nnfromvertex(X, what = c("dist", "which"), k = 1)`

##### Arguments

- X
Point pattern on a linear network (object of class

`"lpp"`

).- what
Character string specifying whether to return the nearest-neighbour distances, nearest-neighbour identifiers, or both.

- k
Integer, or integer vector, specifying that the

`k`

th nearest neighbour should be returned.

##### Details

For each vertex (node) of the linear network,
this algorithm finds the nearest data point to the vertex,
and returns either the distance from the vertex to its nearest
neighbour in `X`

, or the serial number of the nearest neighbour
in `X`

, or both.

If `k`

is an integer, then the `k`

-th nearest neighbour
is found instead.

If `k`

is an integer vector, this is repeated for each
integer in `k`

.

##### Value

A numeric vector, matrix, or data frame.

##### See Also

##### Examples

```
# NOT RUN {
X <- runiflpp(5, simplenet)
nnfromvertex(X)
nnfromvertex(X, k=1:3)
# }
```

*Documentation reproduced from package spatstat, version 1.57-1, License: GPL (>= 2)*