geom_line {ggplot2}R Documentation

geom_line

Description

Connect observations, in ordered by x value

Usage

geom_line(mapping=NULL, data=NULL, stat="identity", position="identity", ...)

Arguments

mapping mapping between variables and aesthetics generated by aes
data dataset used in this layer, if not specified uses plot dataset
stat statistic used by this layer
position position adjustment used by this layer
... ignored

Details

This page describes geom_line, see layer and qplot for how to create a complete plot from individual components.

Value

A layer

Aesthetics

The following aesthetics can be used with geom_line. Aesthetics are mapped to variables in the data with the aes function: geom\_line(\code{aes}(x = var))

Author(s)

Hadley Wickham, http://had.co.nz/

See Also

Examples

## Not run: 
# Summarise number of movie ratings by year of movie
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, aes(x=year, y=number, group=rating))
p + geom_line()

# Add aesthetic mappings
p + geom_line(aes(size = rating))
p + geom_line(aes(colour = rating))

# Change scale
p + geom_line(aes(colour = rating)) + scale_colour_gradient(low="red")
p + geom_line(aes(size = rating)) + scale_size(to = c(0.1, 3))

# Set aesthetics to fixed value
p + geom_line(colour = "red", size = 1)

# Use qplot instead
qplot(year, number, data=mry, group=rating, geom="line")

# Using a time series
qplot(date, pop, data=economics, geom="line")
qplot(date, pop, data=economics, geom="line", log="y")
qplot(date, pop, data=subset(economics, date > as.Date("2006-1-1")), geom="line")
qplot(date, pop, data=economics, size=unemploy/pop, geom="line")

# See scale_date for examples of plotting multiple times series on
# a single graph
## End(Not run)

[Package ggplot2 version 0.8.2 Index]