R: Draw Points on Existing Plot

points.lpp {spatstat} | R Documentation

## Draw Points on Existing Plot

### Description

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 class '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`.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.

### See Also

`plot.lpp`, `points.default`

### Examples

     plot(Frame(spiders), main="Spiders on a Brick Wall")
     points(spiders)

[Package spatstat version 1.54-0 Index]