{"id":1084,"date":"2023-07-27T17:36:07","date_gmt":"2023-07-27T17:36:07","guid":{"rendered":"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/"},"modified":"2023-07-27T17:36:07","modified_gmt":"2023-07-27T17:36:07","slug":"r-combineer-twee-kolommen-tot-een","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/","title":{"rendered":"Hoe twee kolommen in \u00e9\u00e9n te combineren in r (met voorbeelden)"},"content":{"rendered":"

<\/p>\n

\n

Vaak wilt u misschien twee kolommen combineren tot \u00e9\u00e9n in R. Stel dat u bijvoorbeeld een dataframe met drie kolommen heeft:<\/span><\/p>\n

 month year value\n   10 2019 15\n   10 2020 13\n   11 2020 13\n   11 2021 19\n   12 2021 22\n<\/strong><\/pre>\n
 Mogelijk wilt u de kolommen maand en jaar combineren in \u00e9\u00e9n enkele kolom met de naam datum<\/em> :<\/span><\/p>\n
 date value\n   2019_10 15\n   2020_10 13\n   2020_11 13\n   2021_11 19\n   2021_12 22<\/strong><\/pre>\n
 In deze tutorial worden twee manieren uitgelegd om dit snel te doen in R.<\/span><\/p>\n
 Methode 1: Gebruik de functie Plakken van Base R<\/strong><\/span><\/h3>\n
 De volgende code laat zien hoe u de plakfunctie<\/strong> van de R-database gebruikt om de kolommen maand<\/em> en jaar<\/em> te combineren in \u00e9\u00e9n enkele kolom met de naam datum<\/em> :<\/span><\/p>\n
 #create data frame<\/span>\ndata <- data.frame(month=c(10, 10, 11, 11, 12),\n                   year=c(2019, 2020, 2020, 2021, 2021),\n                   value=c(15, 13, 13, 19, 22))\n\n#view data frame\n<\/span>data\n\n#combine year and month into one column<\/span>\ndata$date <- paste<\/span> (data$year, data$month, sep=\" _<\/span> \")\n\n#view new data frame<\/span>\ndata\n\n  month year value date\n1 10 2019 15 2019_10\n2 10 2020 13 2020_10\n3 11 2020 13 2020_11\n4 11 2021 19 2021_11\n5 12 2021 22 2021_12\n<\/strong><\/pre>\n
 Nadat we de twee kolommen hebben gecombineerd, kunnen we de oude verwijderen als we dat willen:<\/span><\/p>\n
 data_new <- data[c(\" date<\/span> \", \" value<\/span> \")]\n\ndata_new\n\n     date value\n1 2019_10 15\n2 2020_10 13\n3 2020_11 13\n4 2021_11 19\n5 2021_12 22\n<\/strong><\/pre>\n
 Methode 2: Gebruik de Unite-functie van Tidyr<\/strong><\/span><\/h3>\n
 De volgende code laat zien hoe je de unit-<\/b> functie in het tiydr-pakket kunt gebruiken om de kolommen maand<\/em> en jaar<\/em> te combineren in \u00e9\u00e9n enkele kolom met de naam date<\/em> :<\/span><\/p>\n
 #load tidyr package<\/span>\nlibrary(tidyr)<\/span>\n\n#create data frame<\/span>\ndata <- data.frame(month=c(10, 10, 11, 11, 12),\n                   year=c(2019, 2020, 2020, 2021, 2021),\n                   value=c(15, 13, 13, 19, 22))\n\n#combine year and month into one column<\/span>\nunit<\/span> (data, date, c(year, month))\n\n     date value\n1 2019_10 15\n2 2020_10 13\n3 2020_11 13\n4 2021_11 19\n5 2021_12 22<\/strong><\/pre>\n
 Merk op dat beide methoden identieke resultaten opleveren.<\/span><\/p>\n
 De volledige documentatie over de werking van het apparaat vindt u hier<\/a> .<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Vaak wilt u misschien twee kolommen combineren tot \u00e9\u00e9n in R. Stel dat u bijvoorbeeld een dataframe met drie kolommen heeft: month year value 10 2019 15 10 2020 13 11 2020 13 11 2021 19 12 2021 22 Mogelijk wilt u de kolommen maand en jaar combineren in \u00e9\u00e9n enkele kolom met de naam […]<\/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-1084","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"\nHoe twee kolommen in \u00e9\u00e9n te combineren in R (met voorbeelden)<\/title>\n<meta name=\"description\" content=\"In deze zelfstudie wordt uitgelegd hoe u twee kolommen combineert tot \u00e9\u00e9n in een R-dataframe.\" \/>\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-combineer-twee-kolommen-tot-een\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe twee kolommen in \u00e9\u00e9n te combineren in R (met voorbeelden)\" \/>\n<meta property=\"og:description\" content=\"In deze zelfstudie wordt uitgelegd hoe u twee kolommen combineert tot \u00e9\u00e9n in een R-dataframe.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T17:36:07+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=\"1\u00a0Minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/\",\"url\":\"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/\",\"name\":\"Hoe twee kolommen in \u00e9\u00e9n te combineren in R (met voorbeelden)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-27T17:36:07+00:00\",\"dateModified\":\"2023-07-27T17:36:07+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze zelfstudie wordt uitgelegd hoe u twee kolommen combineert tot \u00e9\u00e9n in een R-dataframe.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/r-combineer-twee-kolommen-tot-een\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe twee kolommen in \u00e9\u00e9n te combineren in r (met voorbeelden)\"}]},{\"@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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