{"id":4281,"date":"2023-07-12T07:54:28","date_gmt":"2023-07-12T07:54:28","guid":{"rendered":"https:\/\/statorials.org\/nl\/dplyr-ronde\/"},"modified":"2023-07-12T07:54:28","modified_gmt":"2023-07-12T07:54:28","slug":"dplyr-ronde","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/dplyr-ronde\/","title":{"rendered":"Waarden in specifieke kolommen afronden met dplyr"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">U kunt de volgende methoden gebruiken om waarden in specifieke kolommen van een dataframe af te ronden met behulp van het <strong>dplyr-<\/strong> pakket in R:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Methode 1: Ronde waarden in specifieke kolommen<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#round values in 'sales' and 'returns' columns to 2 decimal places \n<\/span>df_new &lt;- df %&gt;% mutate(across(c(' <span style=\"color: #ff0000;\">sales<\/span> ', ' <span style=\"color: #ff0000;\">returns<\/span> '), round, <span style=\"color: #008000;\">2<\/span> ))\n<\/strong><\/pre>\n<p> <strong><span style=\"color: #000000;\">Methode 2: Rond de waarden in alle numerieke kolommen af<\/span><\/strong><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#round values in all numeric columns to 2 decimal places\n<\/span>df_new &lt;- df %&gt;% mutate(across(where(is. <span style=\"color: #3366ff;\">numeric<\/span> ), round, <span style=\"color: #008000;\">2<\/span> ))<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u elke methode in de praktijk kunt gebruiken met het volgende dataframe in R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (store=c('A', 'A', 'A', 'B', 'B', 'C', 'C', 'C'),\n                 sales=c(4.352, 6.5543, 7.5423, 9.22111, 4.332, 9.55, 8.0094, 7.2),\n                 returns=c(1.2324, 2.6654, 3.442, 6.545, 8.11, 8.004, 7.545, 6.0),\n                 promos=c(12.11, 14.455, 10.277, 23.51, 20.099, 29.343, 30.1, 45.6))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  store sales returns promos\n1 A 4.35200 1.2324 12.110\n2 A 6.55430 2.6654 14.455\n3 A 7.54230 3.4420 10.277\n4 B 9.22111 6.5450 23.510\n5 B 4.33200 8.1100 20.099\n6 C 9.55000 8.0040 29.343\n7 C 8.00940 7.5450 30.100\n8 C 7.20000 6.0000 45.600\n<\/strong><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld 1: Rond waarden in specifieke kolommen af met dplyr<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u de waarden in de kolommen <strong>Verkoop<\/strong> en <strong>Retouren<\/strong> kunt afronden op 2 decimalen:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#round values in 'sales' and 'returns' columns to 2 decimal places \n<\/span>df_new &lt;- df %&gt;% mutate(across(c(' <span style=\"color: #ff0000;\">sales<\/span> ', ' <span style=\"color: #ff0000;\">returns<\/span> '), round, <span style=\"color: #008000;\">2<\/span> ))\n\n<span style=\"color: #008080;\">#view updated data frame<\/span>\ndf_new\n\n  store sales returns promos\n1 A 4.35 1.23 12.110\n2 A 6.55 2.67 14.455\n3 A 7.54 3.44 10.277\n4 B 9.22 6.54 23.510\n5 B 4.33 8.11 20.099\n6C 9.55 8.00 29.343\n7 C 8.01 7.54 30.100\n8 C 7.20 6.00 45,600\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Houd er rekening mee dat de waarden in de kolommen <strong>Verkoop<\/strong> en <strong>Retouren<\/strong> worden afgerond op 2 decimalen, terwijl alle andere kolommen ongewijzigd blijven.<\/span><\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld 2: Rond waarden in alle numerieke kolommen af met dplyr<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u de waarden van alle numerieke kolommen kunt afronden op 2 decimalen:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#round values in all numeric columns 2 decimal places \n<\/span>df_new &lt;- df %&gt;% mutate(across(where(is. <span style=\"color: #3366ff;\">numeric<\/span> ), round, <span style=\"color: #008000;\">2<\/span> ))\n\n<span style=\"color: #008080;\">#view updated data frame<\/span>\ndf_new\n\n  store sales returns promos\n1 A 4.35 1.23 12.11\n2 A 6.55 2.67 14.46\n3 A 7.54 3.44 10.28\n4 B 9.22 6.54 23.51\n5 B 4.33 8.11 20.10\n6C 9.55 8.00 29.34\n7 C 8.01 7.54 30.10\n8 C 7.20 6.00 45.60\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Houd er rekening mee dat de waarden in de drie numerieke kolommen in het dataframe zijn afgerond op 2 decimalen.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Gerelateerd:<\/strong> <a href=\"https:\/\/statorials.org\/nl\/dplyr-door\/\" target=\"_blank\" rel=\"noopener\">Hoe de across()-functie in dplyr te gebruiken<\/a><\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">In de volgende tutorials wordt uitgelegd hoe u andere veelvoorkomende taken in dplyr uitvoert:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/nl\/dplyr-mute-indien-bevat\/\" target=\"_blank\" rel=\"noopener\">dplyr: Hoe een variabele te muteren als de kolom een string bevat<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/dplyr-mutatiefactor\/\" target=\"_blank\" rel=\"noopener\">dplyr: Hoe factorniveaus te veranderen met mute()<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/dplyr-som-over-meerdere-kolommen\/\" target=\"_blank\" rel=\"noopener\">dplyr: Hoe toe te voegen aan meerdere kolommen<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U kunt de volgende methoden gebruiken om waarden in specifieke kolommen van een dataframe af te ronden met behulp van het dplyr- pakket in R: Methode 1: Ronde waarden in specifieke kolommen library (dplyr) #round values in &#8217;sales&#8216; and &#8218;returns&#8216; columns to 2 decimal places df_new &lt;- df %&gt;% mutate(across(c(&#8218; sales &#8218;, &#8218; returns &#8218;), [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-4281","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Waarden in specifieke kolommen afronden met dplyr - Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u waarden in specifieke kolommen van een dataframe kunt afronden met behulp van dplyr, met verschillende voorbeelden.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/nl\/dplyr-ronde\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Waarden in specifieke kolommen afronden met dplyr - Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u waarden in specifieke kolommen van een dataframe kunt afronden met behulp van dplyr, met verschillende voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/dplyr-ronde\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-12T07:54:28+00:00\" \/>\n<meta name=\"author\" content=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/dplyr-ronde\/\",\"url\":\"https:\/\/statorials.org\/nl\/dplyr-ronde\/\",\"name\":\"Waarden in specifieke kolommen afronden met dplyr - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-12T07:54:28+00:00\",\"dateModified\":\"2023-07-12T07:54:28+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u waarden in specifieke kolommen van een dataframe kunt afronden met behulp van dplyr, met verschillende voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/dplyr-ronde\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/dplyr-ronde\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/dplyr-ronde\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Waarden in specifieke kolommen afronden met dplyr\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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