# points.lpp

##### Draw Points on Existing Plot

For a point pattern on a linear network, this function draws the coordinates of the points only, on the existing plot display.

##### Usage

```
# S3 method for lpp
points(x, …)
```

##### Arguments

- x
A point pattern on a linear network (object of class

`"lpp"`

).- …
Additional arguments passed to

`points.default`

.

##### Details

This is a method for the generic function
`points`

for the class `"lpp"`

of point patterns on a linear network.

If `x`

is a point pattern on a linear network, then
`points(x)`

plots the spatial coordinates of the points only,
on the existing plot display,
without plotting the underlying network.
It is an error to call this function if a plot has not yet been
initialised.

The spatial coordinates are extracted and passed to
`points.default`

along with any extra arguments.
Arguments controlling the colours and the plot symbols are interpreted
by `points.default`

. For example, if the
argument `col`

is a vector, then the `i`

th point is drawn
in the colour `col[i]`

.

##### Value

Null.

##### Difference from plot method

The more usual way to plot the points is using `plot.lpp`

.
For example `plot(x)`

would plot both the points and the
underlying network, while `plot(x, add=TRUE)`

would plot only the
points. The interpretation of arguments controlling the colours and
plot symbols is different here: they determine a symbol map, as explained
in the help for `plot.ppp`

.

##### See Also

##### Examples

```
# NOT RUN {
plot(Frame(spiders), main="Spiders on a Brick Wall")
points(spiders)
# }
```

*Documentation reproduced from package spatstat, version 1.63-0, License: GPL (>= 2)*