{"id":4111,"date":"2023-07-13T13:01:07","date_gmt":"2023-07-13T13:01:07","guid":{"rendered":"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/"},"modified":"2023-07-13T13:01:07","modified_gmt":"2023-07-13T13:01:07","slug":"r-kolommen-uit-dataframe-extraheren","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/","title":{"rendered":"Hoe specifieke kolommen uit het dataframe te extraheren in r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">U kunt de volgende methoden gebruiken om specifieke kolommen uit een dataframe in R te extraheren:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Methode 1: Extraheer specifieke kolommen met Base R<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df[c(' <span style=\"color: #ff0000;\">col1<\/span> ', ' <span style=\"color: #ff0000;\">col3<\/span> ', ' <span style=\"color: #ff0000;\">col4<\/span> ')]\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Methode 2: Extraheer specifieke kolommen met dplyr<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)\n<\/span>\ndf %&gt;%\n  select(col1, col3, col4)\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u elke methode 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> (team=c('A', 'B', 'C', 'D', 'E'),\n                 points=c(99, 90, 86, 88, 95),\n                 assists=c(33, 28, 31, 39, 34),\n                 rebounds=c(30, 28, 24, 24, 28),\n                 steals=c(9, 12, 4, 7, 8))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  team points assists rebounds steals\n1 A 99 33 30 9\n2 B 90 28 28 12\n3 C 86 31 24 4\n4 D 88 39 24 7\n5 E 95 34 28 8<\/strong><\/pre>\n<h2> <span style=\"color: #000000;\"><strong>Methode 1: Extraheer specifieke kolommen met Base R<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe je de kolommen <strong>team<\/strong> , <strong>assists<\/strong> en <strong>rebounds<\/strong> extraheert met behulp van basis R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#select 'team', 'assists' and 'rebounds' columns\n<\/span>df[c(' <span style=\"color: #ff0000;\">team<\/span> ', ' <span style=\"color: #ff0000;\">assists<\/span> ', ' <span style=\"color: #ff0000;\">rebounds<\/span> ')]\n\n  team assists rebounds\n1 to 33 30\n2 B 28 28\n3 C 31 24\n4 D 39 24\n5 E 34 28\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Merk op dat elk van de kolommen die we hebben gespecificeerd, uit het dataframe is ge\u00ebxtraheerd.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Merk ook op dat u deze kolommen ook kunt extraheren op indexpositie:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#select columns in index positions 1, 3 and 4\n<\/span>df[c(1, 3, 4)]\n\n  team assists rebounds\n1 to 33 30\n2 B 28 28\n3 C 31 24\n4 D 39 24\n5 E 34 28\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Deze syntaxis extraheert kolommen in kolomindexposities 1, 3 en 4.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Methode 2: Extraheer specifieke kolommen met dplyr<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u de kolommen <strong>team<\/strong> , <strong>assists<\/strong> en <strong>rebounds<\/strong> kunt extraheren met behulp van de <strong>select()<\/strong> functie uit het <a href=\"https:\/\/dplyr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener\">dplyr-<\/a> pakket:<\/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)\n\n<span style=\"color: #008080;\">#select 'team', 'assists' and 'rebounds' columns\n<\/span>df %&gt;%\n  select(team, assists, rebounds)\n\n  team assists rebounds\n1 to 33 30\n2 B 28 28\n3 C 31 24\n4 D 39 24\n5 E 34 28\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Merk op dat elk van de kolommen die we hebben gespecificeerd, uit het dataframe is ge\u00ebxtraheerd.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Merk ook op dat u deze kolommen ook kunt extraheren op indexpositie:<\/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)\n\n<span style=\"color: #008080;\">#select 'team', 'assists' and 'rebounds' columns\n<\/span>df %&gt;%\n  select(1, 3, 4)\n\n  team assists rebounds\n1 to 33 30\n2 B 28 28\n3 C 31 24\n4 D 39 24\n5 E 34 28<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Deze syntaxis extraheert kolommen in kolomindexposities 1, 3 en 4.<\/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 R kunt uitvoeren:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/nl\/dplyr-selecteer-numerieke-kolommen\/\" target=\"_blank\" rel=\"noopener\">Alleen numerieke kolommen selecteren in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/verwijder-meerdere-kolommen-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe meerdere kolommen in R te verwijderen<\/a><br \/><a href=\"https:\/\/statorials.org\/nl\/kolommen-opnieuw-rangschikken-r\/\" target=\"_blank\" rel=\"noopener\">Kolommen herschikken in R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U kunt de volgende methoden gebruiken om specifieke kolommen uit een dataframe in R te extraheren: Methode 1: Extraheer specifieke kolommen met Base R df[c(&#8218; col1 &#8218;, &#8218; col3 &#8218;, &#8218; col4 &#8218;)] Methode 2: Extraheer specifieke kolommen met dplyr library (dplyr) df %&gt;% select(col1, col3, col4) De volgende voorbeelden laten zien hoe u elke [&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-4111","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>Hoe specifieke kolommen uit een dataframe te extraheren in R - Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u specifieke kolommen uit een dataframe in R kunt extraheren, 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\/r-kolommen-uit-dataframe-extraheren\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe specifieke kolommen uit een dataframe te extraheren in R - Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u specifieke kolommen uit een dataframe in R kunt extraheren, met verschillende voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-13T13:01:07+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\/r-kolommen-uit-dataframe-extraheren\/\",\"url\":\"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/\",\"name\":\"Hoe specifieke kolommen uit een dataframe te extraheren in R - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-13T13:01:07+00:00\",\"dateModified\":\"2023-07-13T13:01:07+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u specifieke kolommen uit een dataframe in R kunt extraheren, met verschillende voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/r-kolommen-uit-dataframe-extraheren\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe specifieke kolommen uit het dataframe te extraheren in r\"}]},{\"@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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