I hate spam & you may opt out anytime: Privacy Policy. Example 1 illustrates how to increase or decrease the text size of our title and subtitle. You can also specify the font size relative to the base_size included in themes such as theme_bw () (where base_size is 11) using the rel () function. It’s a simple barplot with three bars, each of them representing the probability of a different group. Figure 7: Changing Font Size of x-Axis Title. Figure 10: Changing Font Size of Legend Text. Have a look at the following R code and the corresponding barchart: my_ggp + theme(plot.title = element_text(size = 20)) # Plot title size. The functions theme() and element_text() are used to set the font size, color and face of axis tick mark labels. Change the box plot fill color according to the grouping variable dose. In conjunction with the theme system, the element_ functions specify the display of how non-data components of the plot are drawn. Next, I’ll show how to change that! However, both titles have the same size and the same color. It sets both the horizontal and vertical axis … See also. Start by creating a box plot using the ToothGrowth data set. Change the font appearance (text size, color and face) of titles and caption. Useful for multi-line axis titles. Decrease size of caption to size 8; ... We can build up a basic ggplot and heatmap tiles can be plotted using the geom geom_tile. To change the font size and direction of the axes, add the following function to your plot: theme (text = element_text (size=15),axis.text.x = element_text (angle=90, hjust=1)) angle rotates the text, and hjust controls the horizontal justification. library (tidyverse) ggplot (mtcars, aes (wt, mpg)) + geom_point () + labs (title = "Fuel economy declines as weight increases") + theme_classic (base_size = 25) # big, big text. library (tidyverse) key <- c ("High", "Medium", "Low") value <- c (.51, .36, .13) df1 <- data.frame (key, value) df1 %>% ggplot () + aes (x = key, y = value) + geom_bar (stat = "identity") + coord_flip () key <- c ("5+ times a week", "3-4 times a week", "2 or fewer times a week") value <- c (.87, .04, .09) df2 <- data.frame (key, value) df2 %>% ggplot … my_ggp + theme(axis.title.x = element_text(size = 20)) # x-axis title. Use the text() function with the Make variable as before to add labels to the right of the 3-cylinder cars, but now use adj = -0.2 to move the labels further to the right, use the cex argument to increase the label size by 20 percent, and use the font argument to make the labels bold italic. The size of text is measured in mm. Groups = c("Group A", "Group B", "Group C")). Setting it to element_blank() doesn't actually remove the space that is set … Learn how in this article. Here I provide the code I used to create the figures from my previous post on alternatives to grouped bar charts.You are encouraged to play with them yourself! With the following R syntax, we can change the size of the axis titles of our plot. In this example, you’ll learn how to change the font size of the main title of a ggplot. If we want to control the width of our line graphic, we have to specify the size argument within the geom_line function. We can also change how large the text elements of a ggplot2 legend are. Its size must not be very large nor very small but is should be different from the axis titles and axes labels so that there exists a clarity in the graph. Get regular updates on the latest tutorials, offers & news at Statistics Globe. An object of class ggplot. This is unusual, but makes the size of text consistent with the size of lines and points. So keep on reading! my_ggp + theme(axis.title.y = element_text(size = 20)) # y-axis title. Should I be manipulating the axis somehow instead? A basic reason to change the legend appearance without changing the plot is to make the legend more readable. For example: ggplot (mtcars, aes (disp, mpg, col=as.factor (cyl))) + geom_point () + theme_bw () + theme (legend.text=element_text (size=rel (0.5))) Share. Note that I always specified the cex arguments to be equal to 3. I am trying to change the "height" and "width" of my plot and while I have changed the plot margins I would like to change the background to be proportionate with my plot. Better do not scale up fig.height, but set out.width accordingly, eg., like this out.width = "70%". The y-axis title appears too close to the axis text. In this article, I’ll explain how to increase and decrease the text font sizes of ggplot2 plots in R. The tutorial consists of these content blocks: In the examples of this R tutorial, I’ll use the following ggplot2 plot as basis. The jitter geom is a convenient shortcut for geom_point(position = "jitter") . title.vjust: A number specifying vertical justification of the title text… c) You can then choose your text size by clicking on it or use the up and down arrow keys to select it and then press the "Enter" key. Required fields are marked *. In the following R code, facets are labelled by combining the name of the grouping variable with group levels. First, to be able to use the functionality of {ggplot2} we have to load the package (which we can also load via the tidyverse package collection):. Typically you specify font size using points (or pt for short), where 1 pt = 0.35mm. When the graphical device is rendered, brickr makes a best guess on the size of the text. You can learn to craft beautiful charts with the powerful ggplot2 package. Change axis tick mark labels. On this page you learned how to increase the font size of too small text elements in R programming. This is done within the ggplot, so no additional dependency is needed. The easiest way I know of is to set the base_size in a theme call. Figure 2: Changing Font Size of All Text Elements. Number between 0 and 1. To add a geom to the plot use + operator. Facet labels can be modified using the option labeller, which should be a function.. You can use the following syntax to change the size of elements in a ggplot2 legend: ggplot (data, aes(x=x, y=y)) + theme (legend.key.size = unit (1, 'cm'), #change legend key size legend.key.height = unit (1, 'cm'), #change legend key height legend.key.width = unit (1, 'cm'), #change legend key width legend.title = element_text (size=14), #change legend title font size legend.text = … Removes axis lines, text, and ticks. And I mute the caption text and right-align the text. Video & Further Resources location of the text; and the text itself By default, the theme is specified by legend.title in theme() or theme. rel() is used to specify sizes relative to the parent, margin() is used to specify the margins of elements. But it has to be done for each plot individually, there is no global option that I know of. The following code shows how to use the legend.key.size argument to make the keys of the legend larger: We can also use the legend.key.width and legend.key.height arguments to specify widths and heights for the keys: We can use the legend.title argument to make the legend title font size larger: We can use the legend.text argument to make the legend title font size larger: You can learn more about how to make specific adjustments to ggplot2 legends in the ggplot2 documentation. x = element_text ( angle = 90 , size = 5 ) ) Examples of grouped, stacked, overlaid, filled, and colored bar charts. x: an object of the type produced by hclust(); labels: A character vector of labels for the leaves of the tree.The default value is row names. You can use the following syntax to change the size of elements in a ggplot2 legend: The following examples show how to use these arguments in practice. ToothGrowth$dose <- as.factor (ToothGrowth$dose) p <- ggplot (ToothGrowth, aes (x = dose, y = len))+ geom_boxplot (aes (fill = dose)) + scale_fill_viridis_d () p. For a vertical rotation of x axis labels use angle = 90. NoLegend. I mute the text and title of the y-axis since it is not a critical requirement. Improve this answer. You can learn to craft beautiful charts with the powerful ggplot2 package. In the following examples, I’ll explain how to change these font sizes with some simple R code. Then you may want to have a look at the following video tutorial of my YouTube channel. FontSize. Thank you. This is unusual, but makes the size of text consistent with the size of lines and points. Figure 1 shows the output of the previous R code – A basic line plot with relatively thin lines created by the ggplot2 package. In this R graphics tutorial, you will learn how to: Add titles and subtitles by using either the function ggtitle() or labs().