How To Change Font Size In R

How tin can I change the fable title?

Change the characterization for the aesthetic the legend is drawn for in labs().

See example

By default your legend label will be the name of the variable that is mapped to the aesthetic the legend is drawn for. Yous can alter the championship of your legend using labs().

If a legend is drawn for multiple aesthetics, y'all'll want to update the title for all of them.

                                          # not this                      ggplot                      (                      mpg,                      aes                      (ten                      =                      hwy, y                      =                      cty, color                      =                      drv, shape                      =                      drv                      )                      )                      +                      geom_point                      (                      )                      +                      labs                      (colour                      =                      "Drive train"                      )

                                          # simply this                      ggplot                      (                      mpg,                      aes                      (ten                      =                      hwy, y                      =                      cty, color                      =                      drv, shape                      =                      drv                      )                      )                      +                      geom_point                      (                      )                      +                      labs                      (color                      =                      "Drive train", shape                      =                      "Drive train"                      )

How can I increment the spacing between legend keys?

Increment the horizontal space between legend keys with legend.spacing.10 in theme(). This statement takes a unit object created with filigree::unit().

See example

If you lot have a horizontal legend, generally placed on summit or bottom of the plot with fable.position = "top" or "bottom", you can modify the spacing between legend keys with legend.spacing.x. You lot can supply a unit object to this statement, e.grand.unit(i.0, "cm") for 1 cm space between legend keys. See the documentation for grid::unit() for more options for units.

For vertical legends changing fable.spacing.y changes the space betwixt the legend title and the keys, but not between the keys, due east.1000. see the large space betwixt the legend championship and keys.

In order to change the space between the legend keys, you tin can beginning brand the key size bigger with legend.key.size and and then remove the grayness groundwork color with legend.central.

Notation that the fable championship is no longer aligned with the keys with this arroyo. You lot tin can also shift information technology over with legend.title.align.

How can I change the key labels in the fable?

If you lot don't want to change the levels of the variable the fable is being drawn for, yous can change the key labels at the time of cartoon the plot using the labels argument in the advisable scale_*() role, due east.thousand.scale_colour_discrete() if the legend is for a discrete variable mapped to the make full aesthetic.

See example

The labels argument of scale_* functions takes named vectors, which what we would recommend using for relabeling keys in a legend. Using named lists allows you to declare explicitly which label is assigned to which level, without having to keep rail of level guild.

How tin can I alter the font sizes in the legend?

Set your preference in fable.text for key labels and legend.title in theme(). In both cases, prepare font size in the size argument of element_text(), due east.g.fable.text = element_text(size = 14).

See instance

Font characteristics of a legend can be controlled with the legend.text and fable.title elements of theme(). You can use the following for 14 pts text for legend cardinal labels and 10 pts text for legend title. (Note that this doesn't effect in a visually pleasing legend, past default ggplot2 uses a larger font size for the fable championship than the fable text.)

For further customization of fable text, see the documentation for element_text(), e.m. you can change font colors or font face as well.

Colours

How can I modify the background colour of plot?

Set up the color in panel.background element of theme() with element_rect(), which takes arguments like make full (for background make full colour) and color (for background edge colour.

See example

You can set the background colour of the plot with console.backgroun in theme(). In the following case the border is made thicker with size = 3 to

If yous want to modify the colour of the plotting surface area just non the panel where the panel, y'all can so the same thing with plot.background.

Note that ggplot2 has a variety of complete themes that might already practice what you're hoping to attain. For example, if you prefer a more than minimal look to your plots, without the grey background, you might try theme_minimal().

And y'all tin keep customization based on one of these themes.

You might also find the thematic parcel useful for simplified theming of your plots.

How can I modify the colour NAs are represented with in a plot?

You can gear up the color of NA with the na.value argument in the appropriate scale_*() function, east.grand.scale_fill_discrete(na.value = "purple") to make NAs purple.

See example

Suppose yous take the post-obit data frame with 2 discrete variables, one of which has an NA.

                                          df                      <-                      tibble                      ::                      tribble                      (                      ~                      group,                      ~                      issue,                      1,                      "yep",                      1,                      "no",                      2,                      "yes",                      ii,                      "no",                      2,                      "no",                      2,                      NA                      )

By default, ggplot2 uses grey to represent NAsouthward.

Yous can change the color of NA with scale_fill_discrete() in this instance, e.thou. make it purple.

Yous tin also prepare the color to "transparent". In the plot below this is shown with theme_minimal() to demonstrate how that looks on a plot with a transparent groundwork. Note that while this is possible, setting the colour to transparent every bit such wouldn't exist recommended in this item example as it gives the advent of a floating bar.

Fonts

How tin I change the default font size in ggplot2?

Set up base_size in the theme you lot're using, which is theme_gray() by default.

See example

The base font size is eleven pts by default. You can alter it with the base_size argument in the theme you're using. See the complete theme documentation for more than high level options you lot can set.

If you would like all plots within a session/document to use a item base of operations size, you can prepare it with theme_set(). Run the following at the beginning of your session or include on top of your R Markdown document.

How can I change the font size of the plot title and subtitle?

Set your preference in plot.title and plot.subtitle in theme(). In both cases, ready font size in the size statement of element_text(), due east.thousand.plot.championship = element_text(size = 20).

Run across example

Font characteristics of plot titles and subtitles can be controlled with the plot.title and plot.subtitle elements of theme(). You tin utilise the post-obit for 20 pts text for the plot title and 15 pts text for the plot subtitle.

For further customization of plot title and subtitle, see the documentation for element_text(), e.m. you can change font colors or font face as well.

How tin I change the font size of axis labels?

Set your preference in centrality.title. centrality.title.ten, or axis.title.y in theme(). In both cases, set font size in the size statement of element_text(), eastward.k.axis.text = element_text(size = xiv).

See example

Font characteristics of axis labels tin exist controlled with centrality.title.x or axis.title.y (or axis.championship if yous the same settings for both axes).

For further customization of plot title and subtitle, run across the documentation for element_text(), eastward.1000. you lot tin modify font colors or font confront besides.

You tin also alter the size of the axis text (e.m. numbers at the axis ticks) using axis.text (or axis.text.ten and axis.text.y if you desire to fix dissimilar sizes).

What is the default size of `geom_text()` and how tin can I change the font size of `geom_text()`?

The default font size of geom_text() is 3.88.

                                      GeomLabel                    $                    default_aes                    $                    size                    #> [1] 3.88

You can modify the size using the size argument in geom_text() for a single plot. If you want to utilize the same updated size, yous can prepare this with update_geom_defaults(), e.g.update_geom_defaults("text", list(size = six)).

See case

Suppose you take the following information frame and visualization.

                                          df                      <-                      tibble                      ::                      tribble                      (                      ~                      x,                      ~                      y,                      ~                      name,                      two,                      ii,                      "ii",                      iii,                      3,                      "three",                      4,                      iv,                      "4"                      )                      ggplot                      (                      df,                      aes                      (x                      =                      10, y                      =                      y, label                      =                      name                      )                      )                      +                      geom_text                      (                      )

You can set the size of the text with the following.

Or you lot can map information technology to the size aesthetic. In the following size is adamant by the x value with scale_size_identity().

If you lot desire to use the same updated size for geom_text() in a series of plots in a session/R Markdown document, you can fix apply update_geom_defaults() to update the default size, due east.g. if you desire the size for all geom_text() to be half-dozen, use update_geom_defaults("text", list(size = half-dozen)).