{"id":8387,"date":"2019-01-07T08:30:45","date_gmt":"2019-01-07T06:30:45","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=8387"},"modified":"2019-12-25T10:57:44","modified_gmt":"2019-12-25T08:57:44","slug":"how-to-subset-a-dataset-when-plotting-with-ggplot2","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/blog\/how-to-subset-a-dataset-when-plotting-with-ggplot2\/","title":{"rendered":"How to Subset a Dataset When Plotting with GGPLOT2"},"content":{"rendered":"<div id=\"rdoc\">\n<p>This article describes how to <strong>subset<\/strong> data when creating a <strong>ggplot<\/strong>.<\/p>\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_bw()<\/code> as the default theme:<\/p>\n<pre class=\"r\"><code>library(ggplot2) \r\ntheme_set(theme_bw())<\/code><\/pre>\n<\/div>\n<div id=\"data-preparation\" class=\"section level2\">\n<h2>Data preparation<\/h2>\n<p>Data derived from <code>ToothGrowth<\/code> data sets are used. ToothGrowth describes the effect of Vitamin C on tooth growth in Guinea pigs. Three dose levels of Vitamin C (0.5, 1, and 2 mg) with each of two delivery methods [orange juice (OJ) or ascorbic acid (VC)] are used :<\/p>\n<pre class=\"r\"><code>df &lt;- data.frame(\r\n  supp = rep(c(\"VC\", \"OJ\"), each = 3),\r\n  dose = rep(c(\"D0.5\", \"D1\", \"D2\"), 2),\r\n  len = c(6.8, 15, 33, 4.2, 10, 29.5)\r\n  )\r\n\r\nhead(df)<\/code><\/pre>\n<pre><code>##   supp dose  len\r\n## 1   VC D0.5  6.8\r\n## 2   VC   D1 15.0\r\n## 3   VC   D2 33.0\r\n## 4   OJ D0.5  4.2\r\n## 5   OJ   D1 10.0\r\n## 6   OJ   D2 29.5<\/code><\/pre>\n<ul>\n<li>len : Tooth length<\/li>\n<li>dose : Dose in milligrams (0.5, 1, 2)<\/li>\n<li>supp : Supplement type (VC or OJ)<\/li>\n<\/ul>\n<\/div>\n<div id=\"create-a-plot-the-whole-dataset\" class=\"section level2\">\n<h2>Create a plot the whole dataset<\/h2>\n<pre class=\"r\"><code>ggplot(df, aes(x = dose, y = len))+\r\n  geom_col(aes(fill = supp), width = 0.7) +\r\n  scale_fill_viridis_d()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/123-ggplot-subset-geom_col-basic-1.png\" width=\"480\" \/><\/p>\n<\/div>\n<div id=\"subset-the-dataset\" class=\"section level2\">\n<h2>Subset the dataset<\/h2>\n<pre class=\"r\"><code>ggplot(subset(df, dose %in% c(\"D0.5\", \"D1\")), aes(x = dose, y = len))+\r\n  geom_col(aes(fill = supp), width = 0.7) +\r\n  scale_fill_viridis_d()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/123-ggplot-subset-subset-1.png\" width=\"384\" \/><\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article describes how to subset data when creating a ggplot. Prerequisites Load required packages and set the theme function theme_bw() as the default theme: library(ggplot2) theme_set(theme_bw()) Data preparation Data [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7950,"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-8387","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 Subset a Dataset When Plotting with GGPLOT2 - Datanovia<\/title>\n<meta name=\"description\" content=\"This article describes how to subset data when creating a ggplot.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.datanovia.com\/en\/blog\/how-to-subset-a-dataset-when-plotting-with-ggplot2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Subset a Dataset When Plotting with GGPLOT2 - 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