{"id":8290,"date":"2018-12-25T12:24:00","date_gmt":"2018-12-25T10:24:00","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=8290"},"modified":"2019-12-25T11:12:22","modified_gmt":"2019-12-25T09:12:22","slug":"ggplot-point-shapes-best-tips","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/blog\/ggplot-point-shapes-best-tips\/","title":{"rendered":"GGPLOT Point Shapes Best Tips"},"content":{"rendered":"<div id=\"rdoc\">\n<p>This article describes how to change a <strong>ggplot point shapes<\/strong>.<\/p>\n<p>You will learn how to:<\/p>\n<ul>\n<li><strong>Change ggplot point shape values<\/strong>. In ggplot, point shapes can be specified in the function <code>geom_point()<\/code>. Key arguments include:\n<ul>\n<li><code>shape<\/code>: numeric values as <code>pch<\/code> for setting plotting points shapes.<\/li>\n<li><code>size<\/code>: numeric values <code>cex<\/code> for changing points size<\/li>\n<li><code>color<\/code>: color name or code for points.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Modify ggplot point shapes and colors by groups<\/strong>. In this case, you can set manually point shapes and colors. key ggplot2 functions: <code>scale_shape_manual()<\/code> and <code>scale_color_manual()<\/code><\/li>\n<li><strong>Use special point shapes, including pch 21 and pch 24<\/strong>. The interesting feature of these point symbols is that you can change their background fill color and, their border line type and color.<\/li>\n<\/ul>\n<p>Contents:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#key-r-functions\">Key R functions<\/a><\/li>\n<li><a href=\"#list-of-point-symbols\">List of point symbols<\/a><\/li>\n<li><a href=\"#demo-dataset\">Demo dataset<\/a><\/li>\n<li><a href=\"#basic-scatter-plots\">Basic scatter plots<\/a><\/li>\n<li><a href=\"#scatter-plot-with-multiple-groups\">Scatter plot with multiple groups<\/a><\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<\/ul>\n<\/div>\n<div id=\"key-r-functions\" class=\"section level2\">\n<h2>Key R functions<\/h2>\n<ul>\n<li><code>geom_point(aes(x, y), data = NULL, shape = 19, color = \"black\", size = 1)<\/code>: ggplot2 function to create a scatter plot.<\/li>\n<li><code>scale_shape_manual()<\/code>, <code>scale_color_manual()<\/code> and <code>scale_size_manual()<\/code>: ggplot2 functions to set manually point shape, color and size.<\/li>\n<\/ul>\n<\/div>\n<div id=\"list-of-point-symbols\" class=\"section level2\">\n<h2>List of point symbols<\/h2>\n<p>The most commonly used pch values in R, include:<\/p>\n<div class=\"block\">\n<ul>\n<li>shape = 0, square<\/li>\n<li>shape = 1, circle<\/li>\n<li>shape = 2, triangle point up<\/li>\n<li>shape = 3, plus<\/li>\n<li>shape = 4, cross<\/li>\n<li>shape = 5, diamond<\/li>\n<li>shape = 6, triangle point down<\/li>\n<li>shape = 7, square cross<\/li>\n<li>shape = 8, star<\/li>\n<li>shape = 9, diamond plus<\/li>\n<li>shape = 10, circle plus<\/li>\n<li>shape = 11, triangles up and down<\/li>\n<li>shape = 12, square plus<\/li>\n<li>shape = 13, circle cross<\/li>\n<li>shape = 14, square and triangle down<\/li>\n<li>shape = 15, filled square<\/li>\n<li>shape = 16, filled circle<\/li>\n<li>shape = 17, filled triangle point-up<\/li>\n<li>shape = 18, filled diamond<\/li>\n<li>shape = 19, solid circle<\/li>\n<li>shape = 20, bullet (smaller circle)<\/li>\n<li>shape = 21, filled circle blue<\/li>\n<li>shape = 22, filled square blue<\/li>\n<li>shape = 23, filled diamond blue<\/li>\n<li>shape = 24, filled triangle point-up blue<\/li>\n<li>shape = 25, filled triangle point down blue<\/li>\n<\/ul>\n<\/div>\n<p>The function below illustrates the different point shape values. First install the <code>ggpubr<\/code> package (<code>install.packages(\"ggpubr\")<\/code>), and then type this:<\/p>\n<pre class=\"r\"><code>ggpubr::show_point_shapes()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/030-ggplot-point-shapes-r-pch-list-showing-different-point-shapes-in-rstudio-1.png\" width=\"288\" \/><\/p>\n<div class=\"warning\">\n<p>Note that,<\/p>\n<ul>\n<li>Other different characters symbols can be used to specify the shape argument, including \u201c+\u201d, \u201c*\u201c,\u201d-\u201c,\u201d.\u201c,\u201d#, \u201c%\u201d, \u201co\u201d.<\/li>\n<li>shape options from 21 to 25 are open symbols that can be filled by a color.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div id=\"demo-dataset\" class=\"section level2\">\n<h2>Demo dataset<\/h2>\n<p>We\u2019ll use the R built-in datasets: <code>iris<\/code>.<\/p>\n<pre class=\"r\"><code>head(iris, 3)<\/code><\/pre>\n<pre><code>##   Sepal.Length Sepal.Width Petal.Length Petal.Width Species\r\n## 1          5.1         3.5          1.4         0.2  setosa\r\n## 2          4.9         3.0          1.4         0.2  setosa\r\n## 3          4.7         3.2          1.3         0.2  setosa<\/code><\/pre>\n<\/div>\n<div id=\"basic-scatter-plots\" class=\"section level2\">\n<h2>Basic scatter plots<\/h2>\n<p>Create a scatter plot and change points shape, color and size:<\/p>\n<pre class=\"r\"><code>library(ggplot2)\r\n# Change shape, color and size\r\nggplot(iris, aes(Sepal.Length, Sepal.Width)) +\r\n  geom_point(shape = 18, color = \"#FC4E07\", size = 3)+\r\n  theme_minimal()\r\n\r\n# Change background fill and line color\r\nggplot(iris, aes(Sepal.Length, Sepal.Width)) +\r\n  geom_point(shape = 21, fill = \"lightgray\",\r\n             color = \"black\", size = 3)+\r\n  theme_minimal()<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/030-ggplot-point-shapes-change-ggplot-point-shapes-1.png\" width=\"336\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/030-ggplot-point-shapes-change-ggplot-point-shapes-2.png\" width=\"336\" \/><\/p>\n<div class=\"notice\">\n<p>Recall that, the argument <code>fill<\/code> can be used only for the point shapes 21 to 25.<\/p>\n<\/div>\n<\/div>\n<div id=\"scatter-plot-with-multiple-groups\" class=\"section level2\">\n<h2>Scatter plot with multiple groups<\/h2>\n<p>It\u2019s also possible to change point shapes and colors by groups. In this case, ggplot2 will use automatically a default color palette and point shapes. You can change manually the appearance of points using the following functions:<\/p>\n<ul>\n<li><code>scale_shape_manual()<\/code> : to change manually point shapes<\/li>\n<li><code>scale_color_manual()<\/code> : to change manually point colors<\/li>\n<li><code>scale_size_manual()<\/code> : to change manually the size of points<\/li>\n<\/ul>\n<pre class=\"r\"><code># Change point shapes and colors by groups\r\nggplot(iris, aes(Sepal.Length, Sepal.Width)) +\r\n  geom_point(aes(shape = Species, color = Species), size = 3) +\r\n  scale_shape_manual(values = c(5, 16, 17)) +\r\n  scale_color_manual(values = c(\"#00AFBB\", \"#E7B800\", \"#FC4E07\"))+\r\n  theme_minimal() +\r\n  theme(legend.position = \"top\")<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/030-ggplot-point-shapes-geom_point-shape-by-group-scale-shape-manual-1.png\" width=\"480\" \/><\/p>\n<\/div>\n<div id=\"conclusion\" class=\"section level2\">\n<h2>Conclusion<\/h2>\n<p>This article describes how to change ggplot point shapes.<\/p>\n<ul>\n<li>Display the different point symbols in R:<\/li>\n<\/ul>\n<pre class=\"r\"><code>ggpubr::show_point_shapes()<\/code><\/pre>\n<ul>\n<li>Change point shapes in ggplot2. Use <strong>shape<\/strong>, <strong>size<\/strong> and <strong>color<\/strong> in <code>geom_point()<\/code>:<\/li>\n<\/ul>\n<pre class=\"r\"><code>library(ggplot2)\r\nggplot(iris, aes(Sepal.Length, Sepal.Width)) +\r\n  geom_point(shape = 18, color = \"#FC4E07\", size = 3)+\r\n  theme_minimal()<\/code><\/pre>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This article describes how to change a ggplot point shapes. You will learn how to: Change ggplot point shape values. In ggplot, point shapes can be specified in the function [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7801,"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":[315],"class_list":["post-8290","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ggplot2","tag-ggplot2-graphical-parameters"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>GGPLOT Point Shapes Best Tips - Datanovia<\/title>\n<meta name=\"description\" content=\"You will learn how to change ggplot point shapes for a basic scatter plot, as well as, for a scatter plot containing multiple groups\" \/>\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\/ggplot-point-shapes-best-tips\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GGPLOT Point Shapes Best Tips - 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