ggline {ggplot} | R Documentation

## Grob function: line

### Description

Add a line to the plot

### Usage

    ggline(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

    mry <- do.call(rbind, by(movies, round(movies$rating), function(df) {
    nums <- tapply(df$length, df$year, length)
    data.frame(rating=round(df$rating[1]), year = as.numeric(names(nums)), number=as.vector(nums))
    }))
    p <- ggplot(mry, aesthetics = list(x=year, y=number, id=rating))
    ggline(p)
    ggpath(p, list(size=rating))
    ggpath(p, list(colour=rating))

[Package ggplot version 0.4.2 Index]