{"id":8354,"date":"2019-01-03T22:43:49","date_gmt":"2019-01-03T20:43:49","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=8354"},"modified":"2019-12-25T11:08:48","modified_gmt":"2019-12-25T09:08:48","slug":"how-to-change-ggplot-facet-labels","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/blog\/how-to-change-ggplot-facet-labels\/","title":{"rendered":"How to Change GGPlot Facet Labels"},"content":{"rendered":"<p>&nbsp;<\/p>\n<div id=\"rdoc\">\n<p>This article describes how to change easily <strong>ggplot facet labels<\/strong>.<\/p>\n<p>Contents:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#prerequisites\">Prerequisites<\/a><\/li>\n<li><a href=\"#basic-ggplot-with-facet\">Basic ggplot with facet<\/a><\/li>\n<li><a href=\"#change-the-text-of-facet-labels\">Change the text of facet labels<\/a><\/li>\n<li><a href=\"#customize-facet-labels-appearance\">Customize facet labels appearance<\/a><\/li>\n<li><a href=\"#change-facet-background-color\">Change facet background color<\/a><\/li>\n<\/ul>\n<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div class='dt-sc-ico-content type1'><div class='custom-icon' ><a href='https:\/\/www.datanovia.com\/en\/product\/ggplot2-essentials-for-great-data-visualization-in-r\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/product\/ggplot2-essentials-for-great-data-visualization-in-r\/' target='_blank'> Related Book <\/a><\/h4>GGPlot2 Essentials for Great Data Visualization in R<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"prerequisites\" class=\"section level2\">\n<h2>Prerequisites<\/h2>\n<p>Load required packages and set the theme function <code>theme_light()<\/code> [ggplot2] as the default theme:<\/p>\n<pre class=\"r\"><code>library(ggplot2)\r\ntheme_set(\r\n  theme_light() + theme(legend.position = \"top\")\r\n  )<\/code><\/pre>\n<\/div>\n<div id=\"basic-ggplot-with-facet\" class=\"section level2\">\n<h2>Basic ggplot with facet<\/h2>\n<p>Create a box plot filled by groups:<\/p>\n<pre class=\"r\"><code># Load data and convert dose to a factor variable\r\ndata(\"ToothGrowth\")\r\nToothGrowth$dose &lt;- as.factor(ToothGrowth$dose)\r\n\r\n# Box plot, facet accordding to the variable dose and supp\r\np &lt;- ggplot(ToothGrowth, aes(x = dose, y = len)) + \r\n  geom_boxplot(aes(fill = supp), position = position_dodge(0.9)) +\r\n  scale_fill_viridis_d() \r\np + facet_grid(dose ~ supp)<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/113-ggplot-facet-labels-basic-boxplot-facets-1.png\" width=\"336\" \/><\/p>\n<\/div>\n<div id=\"change-the-text-of-facet-labels\" class=\"section level2\">\n<h2>Change the text of facet labels<\/h2>\n<p>Facet labels can be modified using the option <code>labeller<\/code>, which should be a function.<\/p>\n<ul>\n<li>In the following R code, facets are labelled by combining the name of the grouping variable with group levels. The labeller function <code>label_both<\/code> is used.<\/li>\n<\/ul>\n<pre class=\"r\"><code>p + facet_grid(dose ~ supp, labeller = label_both)<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/113-ggplot-facet-labels-modify-facet-labels-1.png\" width=\"336\" \/><\/p>\n<ul>\n<li>A simple way to modify facet label text, is to provide new labels as a named character vector:<\/li>\n<\/ul>\n<pre class=\"r\"><code># New facet label names for dose variable\r\ndose.labs &lt;- c(\"D0.5\", \"D1\", \"D2\")\r\nnames(dose.labs) &lt;- c(\"0.5\", \"1\", \"2\")\r\n\r\n# New facet label names for supp variable\r\nsupp.labs &lt;- c(\"Orange Juice\", \"Vitamin C\")\r\nnames(supp.labs) &lt;- c(\"OJ\", \"VC\")\r\n\r\n# Create the plot\r\np + facet_grid(\r\n  dose ~ supp, \r\n  labeller = labeller(dose = dose.labs, supp = supp.labs)\r\n  )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/113-ggplot-facet-labels-change-text-1.png\" width=\"336\" \/><\/p>\n<ul>\n<li>An alternative solution to change the facet labels, is to modify the data:<\/li>\n<\/ul>\n<pre class=\"r\"><code>df &lt;- ToothGrowth\r\n# Modify the data\r\ndf$dose &lt;- factor(df$dose, levels = c(\"0.5\", \"1\", \"2\"), \r\n                  labels = c(\"D0.5\", \"D1\", \"D2\"))\r\ndf$supp &lt;- factor(df$supp, levels = c(\"OJ\", \"VC\"),\r\n                  labels = c(\"Orange Juice\", \"Vitamin C\")\r\n                  )\r\n# Create the plot\r\nggplot(df, aes(x = dose, y = len)) + \r\n  geom_boxplot(aes(fill = supp)) +\r\n  facet_grid(dose ~ supp)<\/code><\/pre>\n<\/div>\n<div id=\"customize-facet-labels-appearance\" class=\"section level2\">\n<h2>Customize facet labels appearance<\/h2>\n<pre class=\"r\"><code># Change facet text font. Possible values for the font style:\r\n  #'plain', 'italic', 'bold', 'bold.italic'.\r\np + facet_grid(dose ~ supp)+\r\n    theme(\r\n      strip.text.x = element_text(\r\n        size = 12, color = \"red\", face = \"bold.italic\"\r\n        ),\r\n      strip.text.y = element_text(\r\n        size = 12, color = \"red\", face = \"bold.italic\"\r\n        )\r\n      )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/113-ggplot-facet-labels-change-facet-labels-appearance-1.png\" width=\"316.8\" \/><\/p>\n<\/div>\n<div id=\"change-facet-background-color\" class=\"section level2\">\n<h2>Change facet background color<\/h2>\n<p>The rectangle around facet labels can be modified using the function <code>element_rect()<\/code>.<\/p>\n<pre class=\"r\"><code>p + facet_grid(dose ~ supp)+\r\n theme(\r\n   strip.background = element_rect(\r\n     color=\"black\", fill=\"#FC4E07\", size=1.5, linetype=\"solid\"\r\n     )\r\n   )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/113-ggplot-facet-labels-change-facet-background-color-1.png\" width=\"316.8\" \/><\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; This article describes how to change easily ggplot facet labels. Contents: Prerequisites Basic ggplot with facet Change the text of facet labels Customize facet labels appearance Change facet background [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7711,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[124],"tags":[131],"class_list":["post-8354","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ggplot2","tag-ggplot2-faq"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Change GGPlot Facet Labels: The Best Reference - Datanovia<\/title>\n<meta name=\"description\" content=\"This article describes how to change easily ggplot facet labels. 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