{"id":10780,"date":"2019-11-23T10:39:33","date_gmt":"2019-11-23T08:39:33","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=10780"},"modified":"2019-11-23T10:39:33","modified_gmt":"2019-11-23T08:39:33","slug":"comment-faire-un-subset-de-donnees-en-creant-un-ggplot","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/fr\/blog\/comment-faire-un-subset-de-donnees-en-creant-un-ggplot\/","title":{"rendered":"Comment Faire un Subset de Donn\u00e9es en Cr\u00e9ant un GGPLOT"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Cet article d\u00e9crit comment faire un <strong>subset<\/strong> de donn\u00e9es lors de la cr\u00e9ation d\u2019un <strong>ggplot<\/strong>.<\/p>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#prerequis\">Pr\u00e9requis<\/a><\/li>\n<li><a href=\"#preparation-des-donnees\">Pr\u00e9paration des donn\u00e9es<\/a><\/li>\n<li><a href=\"#creer-un-graphique-de-lensemble-des-donnees\">Cr\u00e9er un graphique de l\u2019ensemble des donn\u00e9es<\/a><\/li>\n<li><a href=\"#subset-du-jeu-de-donnees\">Subset du jeu de donn\u00e9es<\/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\/fr\/produit\/ggplot2-lessentiel-pour-une-visualisation-magnifique-des-donnees-dans-r\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/ggplot2-lessentiel-pour-une-visualisation-magnifique-des-donnees-dans-r\/' target='_blank'> Livre Apparent\u00e9 <\/a><\/h4>GGPLOT2 - L\u2019Essentiel pour une Visualisation Magnifique des Donn\u00e9es dans R<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"prerequis\" class=\"section level2\">\n<h2>Pr\u00e9requis<\/h2>\n<p>Charger les packages requis et d\u00e9finir la fonction th\u00e8me <code>theme_bw()<\/code> comme th\u00e8me par d\u00e9faut:<\/p>\n<pre class=\"r\"><code>library(ggplot2) \r\ntheme_set(theme_bw())<\/code><\/pre>\n<\/div>\n<div id=\"preparation-des-donnees\" class=\"section level2\">\n<h2>Pr\u00e9paration des donn\u00e9es<\/h2>\n<p>Les donn\u00e9es d\u00e9riv\u00e9es du jeu de donn\u00e9es \u201cToothGrowth\u201d sont utilis\u00e9es. ToothGrowth d\u00e9crit l\u2019effet de la vitamine C sur la croissance des dents chez les cobayes. On utilise trois doses de vitamine C (0,5, 1 et 2 mg) avec chacune des deux m\u00e9thodes d\u2019administration [jus d\u2019orange (JO) ou acide ascorbique (VC)] :<\/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><code>len<\/code> : Longueur des dents<\/li>\n<li><code>dose<\/code> : Dose en milligrammes (0,5, 1, 2)<\/li>\n<li><code>supp<\/code> : type de suppl\u00e9ment (VC ou OJ)<\/li>\n<\/ul>\n<\/div>\n<div id=\"creer-un-graphique-de-lensemble-des-donnees\" class=\"section level2\">\n<h2>Cr\u00e9er un graphique de l\u2019ensemble des donn\u00e9es<\/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-du-jeu-de-donnees\" class=\"section level2\">\n<h2>Subset du jeu de donn\u00e9es<\/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>Cet article d\u00e9crit comment faire un subset de donn\u00e9es lors de la cr\u00e9ation d\u2019un ggplot. Sommaire: Pr\u00e9requis Pr\u00e9paration des donn\u00e9es Cr\u00e9er un graphique de l\u2019ensemble des donn\u00e9es Subset du jeu [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10781,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[279],"tags":[286],"class_list":["post-10780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ggplot2-fr","tag-faq-ggplot2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment Faire un Subset de Donn\u00e9es en Cr\u00e9ant un GGPLOT - Datanovia<\/title>\n<meta name=\"description\" content=\"Cet article d\u00e9crit comment faire un subset de donn\u00e9es lors de la cr\u00e9ation d&#039;un 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\/fr\/blog\/comment-faire-un-subset-de-donnees-en-creant-un-ggplot\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment Faire un Subset de Donn\u00e9es en Cr\u00e9ant un GGPLOT - 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