ggpath {ggplot} | R Documentation

## Grob function: path

### Description

Add a path (a line between points in the order that they appear in the dataset) to the plot

### Usage

    ggpath(plot = .PLOT, aesthetics=list(), ..., data=NULL)

### Arguments

`plot` | the plot object to modify
`aesthetics` | named list of aesthetic mappings, see details for more information
`...` | other options, see details for more information
`data` | data source, if not specified the plot default will be used

### Details

Aesthetic mappings that this grob function understands:

- `x`:x position (required)
- `y`:y position (required)
- `id`:identifier variable used to break up into multiple paths
- `size`:size of the line, in mm (see `scsize`)
- `colour`:line colour (see `sccolour`)
- `linetype`:line style/type (see `sclinetype`)

These can be specified in the plot defaults (see `ggplot`) or in the `aesthetics` argument. If you want to modify the position of the points or any axis options, you will need to add a position scale to the plot. These functions start with `ps`, eg. `pscontinuous` or `pscategorical`

Other options:

- none

### Author(s)

Hadley Wickham <h.wickham@gmail.com>

### Examples

    myear <- do.call(rbind, by(movies, movies$year, function(df) data.frame(year=df$year[1], mean.length = mean(df$length), mean.rating=mean(df$rating))))
    p <- ggplot(myear, aesthetics=list(x=mean.length, y=mean.rating))
    ggpath(p)
    ggpath(p, list(size=year))
    ggpath(p, list(colour=year))
    ggpath(scsize(p, c(0.5,1)), list(size=year))
    ggpath(scsize(p, c(0.5,1)), list(size=year))
    p <- ggplot(mtcars, aesthetics=list(x=drat, y=wt))
    ggpath(p)
    ggpath(p, list(id=cyl))

[Package ggplot version 0.4.2 Index]