Function reference • ggplot2

Plot basics All ggplot2 plots begin with a call to `ggplot()`, supplying default data and aesthethic mappings, specified by `aes()`. You then add layers, scales, coords and facets with `+`. To save a plot to disk, use `ggsave()`.
	`ggplot()`	Create a new ggplot
	`aes()`	Construct aesthetic mappings
	`+`(<gg>) `%+%`	Add components to a plot
	`ggsave()`	Save a ggplot (or other grid object) with sensible defaults
	`qplot()` `quickplot()`	Quick plot
Layer: geoms A layer combines data, aesthetic mapping, a geom (geometric object), a stat (statistical transformation), and a position adjustment. Typically, you will create layers using a `geom_` function, overriding the default position and stat if needed.
	`geom_abline()` `geom_hline()` `geom_vline()`	Reference lines: horizontal, vertical, and diagonal
	`geom_bar()` `geom_col()` `stat_count()`	Bar charts
	`geom_bin2d()` `stat_bin_2d()`	Heatmap of 2d bin counts
	`geom_blank()`	Draw nothing
	`geom_boxplot()` `stat_boxplot()`	A box and whiskers plot (in the style of Tukey)
	`geom_contour()` `stat_contour()`	2d contours of a 3d surface
	`geom_count()` `stat_sum()`	Count overlapping points
	`geom_density()` `stat_density()`	Smoothed density estimates
	`geom_density_2d()` `stat_density_2d()`	Contours of a 2d density estimate
	`geom_dotplot()`	Dot plot
	`geom_errorbarh()`	Horizontal error bars
	`geom_hex()` `stat_bin_hex()`	Hexagonal heatmap of 2d bin counts
	`geom_freqpoly()` `geom_histogram()` `stat_bin()`	Histograms and frequency polygons
	`geom_jitter()`	Jittered points
	`geom_crossbar()` `geom_errorbar()` `geom_linerange()` `geom_pointrange()`	Vertical intervals: lines, crossbars & errorbars
	`geom_map()`	Polygons from a reference map
	`geom_path()` `geom_line()` `geom_step()`	Connect observations
	`geom_point()`	Points
	`geom_polygon()`	Polygons
	`geom_qq_line()` `stat_qq_line()` `geom_qq()` `stat_qq()`	A quantile-quantile plot
	`geom_quantile()` `stat_quantile()`	Quantile regression
	`geom_ribbon()` `geom_area()`	Ribbons and area plots
	`geom_rug()`	Rug plots in the margins
	`geom_segment()` `geom_curve()`	Line segments and curves
	`geom_smooth()` `stat_smooth()`	Smoothed conditional means
	`geom_spoke()`	Line segments parameterised by location, direction and distance
	`geom_label()` `geom_text()`	Text
	`geom_raster()` `geom_rect()` `geom_tile()`	Rectangles
	`geom_violin()` `stat_ydensity()`	Violin plot
	`coord_sf()` `geom_sf()` `geom_sf_label()` `geom_sf_text()` `stat_sf()`	Visualise sf objects
Layer: stats A handful of layers are more easily specified with a `stat_` function, drawing attention to the statistical transformation rather than the visual appearance. The computed variables can be mapped using `stat()`.
	`stat_ecdf()`	Compute empirical cumulative distribution
	`stat_ellipse()`	Compute normal confidence ellipses
	`stat_function()`	Compute function for each x value
	`stat_identity()`	Leave data as is
	`stat_summary_2d()` `stat_summary_hex()`	Bin and summarise in 2d (rectangle & hexagons)
	`stat_summary_bin()` `stat_summary()`	Summarise y values at unique/binned x
	`stat_unique()`	Remove duplicates
	`stat_sf_coordinates()`	Extract coordinates from 'sf' objects
	`stat()`	Calculated aesthetics
Layer: position adjustment All layers have a position adjustment that resolves overlapping geoms. Override the default by using the `position` argument to the `geom_` or `stat_` function.
	`position_dodge()` `position_dodge2()`	Dodge overlapping objects side-to-side
	`position_identity()`	Don't adjust position
	`position_jitter()`	Jitter points to avoid overplotting
	`position_jitterdodge()`	Simultaneously dodge and jitter
	`position_nudge()`	Nudge points a fixed distance
	`position_stack()` `position_fill()`	Stack overlapping objects on top of each another
Layer: annotations Annotations are a special type of layer that don’t inherit global settings from the plot. They are used to add fixed reference data to plots.
	`geom_abline()` `geom_hline()` `geom_vline()`	Reference lines: horizontal, vertical, and diagonal
	`annotate()`	Create an annotation layer
	`annotation_custom()`	Annotation: Custom grob
	`annotation_logticks()`	Annotation: log tick marks
	`annotation_map()`	Annotation: a maps
	`annotation_raster()`	Annotation: high-performance rectangular tiling
	`borders()`	Create a layer of map borders
Aesthetics The following help topics give a broad overview of some of the ways you can use each aesthetic.
	`aes_colour_fill_alpha`	Colour related aesthetics: colour, fill and alpha
	`aes_group_order`	Aesthetics: grouping
	`aes_linetype_size_shape`	Differentiation related aesthetics: linetype, size, shape
	`aes_position`	Position related aesthetics: x, y, xmin, xmax, ymin, ymax, xend, yend
Scales Scales control the details of how data values are translated to visual properties. Override the default scales to tweak details like the axis labels or legend keys, or to use a completely different translation from data to aesthetic. `labs()` and `lims()` are convenient helpers for the most common adjustments to the labels and limits.
	`labs()` `xlab()` `ylab()` `ggtitle()`	Modify axis, legend, and plot labels
	`lims()` `xlim()` `ylim()`	Set scale limits
	`expand_limits()`	Expand the plot limits, using data
	`expand_scale()`	Generate expansion vector for scales.
	`scale_alpha()` `scale_alpha_continuous()` `scale_alpha_discrete()` `scale_alpha_ordinal()`	Alpha transparency scales
	`scale_colour_brewer()` `scale_fill_brewer()` `scale_colour_distiller()` `scale_fill_distiller()`	Sequential, diverging and qualitative colour scales from colorbrewer.org
	`scale_colour_continuous()` `scale_fill_continuous()`	Continuous colour scales
	`scale_x_continuous()` `scale_y_continuous()` `scale_x_log10()` `scale_y_log10()` `scale_x_reverse()` `scale_y_reverse()` `scale_x_sqrt()` `scale_y_sqrt()`	Position scales for continuous data (x & y)
	`scale_x_date()` `scale_y_date()` `scale_x_datetime()` `scale_y_datetime()` `scale_x_time()` `scale_y_time()`	Position scales for date/time data
	`scale_x_discrete()` `scale_y_discrete()`	Position scales for discrete data
	`scale_colour_gradient()` `scale_fill_gradient()` `scale_colour_gradient2()` `scale_fill_gradient2()` `scale_colour_gradientn()` `scale_fill_gradientn()`	Gradient colour scales
	`scale_colour_grey()` `scale_fill_grey()`	Sequential grey colour scales
	`scale_colour_hue()` `scale_fill_hue()`	Evenly spaced colours for discrete data
	`scale_colour_identity()` `scale_fill_identity()` `scale_shape_identity()` `scale_linetype_identity()` `scale_alpha_identity()` `scale_size_identity()` `scale_discrete_identity()` `scale_continuous_identity()`	Use values without scaling
	`scale_linetype()` `scale_linetype_continuous()` `scale_linetype_discrete()`	Scale for line patterns
	`scale_colour_manual()` `scale_fill_manual()` `scale_size_manual()` `scale_shape_manual()` `scale_linetype_manual()` `scale_alpha_manual()` `scale_discrete_manual()`	Create your own discrete scale
	`scale_shape()`	Scales for shapes, aka glyphs
	`scale_radius()` `scale_size()` `scale_size_area()`	Scales for area or radius
	`scale_colour_viridis_d()` `scale_fill_viridis_d()` `scale_colour_viridis_c()` `scale_fill_viridis_c()`	Viridis colour scales from viridisLite
Guides: axes and legends The guides (the axes and legends) help readers interpret your plots. Guides are mostly controlled via the scale (e.g. with the `limits`, `breaks`, and `labels` arguments), but sometimes you will need additional control over guide appearance. Use `guides()` or the `guide` argument to individual scales along with `guide_colourbar()` or `guide_legend()`.
	`guide_colourbar()` `guide_colorbar()`	Continuous colour bar guide
	`guide_legend()`	Legend guide
	`guides()`	Set guides for each scale
	`sec_axis()` `dup_axis()` `derive()`	Specify a secondary axis
Facetting Facetting generates small multiples, each displaying a different subset of the data. Facets are an alternative to aesthetics for displaying additional discrete variables.
	`facet_grid()`	Lay out panels in a grid
	`facet_wrap()`	Wrap a 1d ribbon of panels into 2d
	`vars()`	Quote faceting variables
Facetting: labels These functions provide a flexible toolkit for controlling the display of the “strip” labels on facets.
	`labeller()`	Construct labelling specification
	`label_value()` `label_both()` `label_context()` `label_parsed()` `label_wrap_gen()`	Useful labeller functions
	`label_bquote()`	Label with mathematical expressions
Coordinate systems The coordinate system determines how the `x` and `y` aesthetics combine to position elements in the plot. The default coordinate system is Cartesian (`coord_cartesian()`), which can be tweaked with `coord_map()`, `coord_fixed()`, `coord_flip()`, and `coord_trans()`, or completely replaced with `coord_polar()`.
	`coord_cartesian()`	Cartesian coordinates
	`coord_fixed()`	Cartesian coordinates with fixed "aspect ratio"
	`coord_flip()`	Cartesian coordinates with x and y flipped
	`coord_map()` `coord_quickmap()`	Map projections
	`coord_polar()`	Polar coordinates
	`coord_trans()`	Transformed Cartesian coordinate system
Themes Themes control the display of all non-data elements of the plot. You can override all settings with a complete theme like `theme_bw()`, or choose to tweak individual settings by using `theme()` and the `element_` functions. Use `theme_set()` to modify the active theme, affecting all future plots.
	`theme()`	Modify components of a theme
	`theme_grey()` `theme_gray()` `theme_bw()` `theme_linedraw()` `theme_light()` `theme_dark()` `theme_minimal()` `theme_classic()` `theme_void()` `theme_test()`	Complete themes
	`theme_get()` `theme_set()` `theme_update()` `theme_replace()` `%+replace%`	Get, set, and modify the active theme
	`margin()` `element_blank()` `element_rect()` `element_line()` `element_text()` `rel()`	Theme elements
Programming with ggplot2 These functions provides tools to help you program with ggplot2, creating functions and for-loops that generate plots for you.
	`aes_()` `aes_string()` `aes_q()`	Define aesthetic mappings programmatically
	`print(<ggplot>)` `plot(<ggplot>)`	Explicitly draw plot
Extending ggplot2 To create your own geoms, stats, scales, and facets, you’ll need to learn a bit about the object oriented system that ggplot2 uses. Start by reading `vignette("extending-ggplot2")` then consult these functions for more details.
	`ggproto()` `ggproto_parent()` `is.ggproto()`	Create a new ggproto object
	`print(<ggproto>)` `format(<ggproto>)`	Format or print a ggproto object
Vector helpers ggplot2 also provides a handful of helpers that are useful for creating visualisations.
	`cut_interval()` `cut_number()` `cut_width()`	Discretise numeric data into categorical
	`mean_cl_boot()` `mean_cl_normal()` `mean_sdl()` `median_hilow()`	A selection of summary functions from Hmisc
	`mean_se()`	Calculate mean and standard error
	`resolution()`	Compute the "resolution" of a numeric vector
Data ggplot2 comes with a selection of built-in datasets that are used in examples to illustrate various visualisation challenges.
	`diamonds`	Prices of 50,000 round cut diamonds
	`economics` `economics_long`	US economic time series
	`faithfuld`	2d density estimate of Old Faithful data
	`midwest`	Midwest demographics
	`mpg`	Fuel economy data from 1999 and 2008 for 38 popular models of car
	`msleep`	An updated and expanded version of the mammals sleep dataset
	`presidential`	Terms of 11 presidents from Eisenhower to Obama
	`seals`	Vector field of seal movements
	`txhousing`	Housing sales in TX
	`luv_colours`	`colors()` in Luv space
Autoplot and fortify `autoplot()` is an extension mechanism for ggplot2: it provides a way for package authors to add methods that work like the base `plot()` function, generating useful default plots with little user interaction. `fortify()` turns objects into tidy data frames: it has largely been superceded by the broom package.
	`autoplot()`	Create a complete ggplot appropriate to a particular data type
	`autolayer()`	Create a ggplot layer appropriate to a particular data type
	`fortify()`	Fortify a model with data.
	`map_data()`	Create a data frame of map data

Reference

Plot basics

Layer: geoms

Layer: stats

Layer: position adjustment

Layer: annotations

Aesthetics

Scales

Guides: axes and legends

Facetting

Facetting: labels

Coordinate systems

Themes

Programming with ggplot2

Extending ggplot2

Vector helpers

Data

Autoplot and fortify

Contents