{"id":1876,"date":"2023-07-24T15:28:21","date_gmt":"2023-07-24T15:28:21","guid":{"rendered":"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/"},"modified":"2023-07-24T15:28:21","modified_gmt":"2023-07-24T15:28:21","slug":"rijsommen-functioneren-in-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/","title":{"rendered":"Hoe de functie rowsums() in r te gebruiken"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">De functie <strong>rowSums()<\/strong> in R kan worden gebruikt om de som van de waarden van elke rij van een matrix of dataframe in R te berekenen.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Deze functie gebruikt de volgende basissyntaxis:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>rowSums(x, na.rm=FALSE)<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Goud:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>x<\/strong> : Naam van het matrix- of datablok.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>na.rm<\/strong> : of NA-waarden moeten worden genegeerd. De standaardwaarde is false.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u deze functie in de praktijk kunt gebruiken.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 1: Gebruik rowSums() met Data Frame<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u <strong>rowSums()<\/strong> gebruikt om de som van de waarden van elke rij in een dataframe te vinden:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, 2, 5, 3, 2),\n                 var3=c(3, 3, 6, 6, 8),\n                 var4=c(1, 1, 2, 14, 9))<\/span>\n\n#view data frame\n<span style=\"color: #000000;\">df\n\n  var1 var2 var3 var4\n1 1 7 3 1\n2 3 2 3 1\n3 3 5 6 2\n4 4 3 6 14\n5 5 2 8 9\n\n<span style=\"color: #008080;\">#find sum of each row\n<\/span>rowSums(df)\n\n[1] 12 9 16 27 24\n<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 2: Gebruik rowSums() met NA-waarden in dataframe<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u <strong>rowSums()<\/strong> kunt gebruiken om de som van de waarden van elke rij in een dataframe te vinden wanneer er in sommige rijen NA-waarden voorkomen:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame with some NA values\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, NA, NA, 3, 2),\n                 var3=c(3, 3, 6, 6, 8),\n                 var4=c(1, 1, 2, NA, 9))<\/span>\n\n#view data frame\n<span style=\"color: #000000;\">df\n\n  var1 var2 var3 var4\n1 1 7 3 1\n2 3 NA 3 1\n3 3 NA 6 2\n4 4 3 6 NA\n5 5 2 8 9\n\n<span style=\"color: #008080;\">#find sum of each row\n<\/span>rowSums(df, na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> )\n\n[1] 12 7 11 13 24<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 3: Gebruik rowSums() met specifieke rijen<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u <strong>rowSums()<\/strong> kunt gebruiken om de som van de waarden in specifieke rijen van een dataframe te vinden:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame with some NA values\n<span style=\"color: #000000;\">df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (var1=c(1, 3, 3, 4, 5),\n                 var2=c(7, NA, NA, 3, 2),\n                 var3=c(3, 3, 6, 6, 8),\n                 var4=c(1, 1, 2, NA, 9))<\/span>\n\n#view data frame\n<span style=\"color: #000000;\">df\n\n  var1 var2 var3 var4\n1 1 7 3 1\n2 3 NA 3 1\n3 3 NA 6 2\n4 4 3 6 NA\n5 5 2 8 9\n\n<span style=\"color: #008080;\">#find sum of rows 1, 3, and 5\n<\/span>rowSums(df[c(1, 3, 5), ], na. <span style=\"color: #3366ff;\">rm<\/span> = <span style=\"color: #008000;\">TRUE<\/span> )\n\n 1 3 5 \n12 11 24<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/nl\/voeg-specifieke-kolommen-toe-in-r\/\" target=\"_blank\" rel=\"noopener\">Specifieke kolommen toevoegen in R (met voorbeelden)<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/som-van-specifieke-rijen-in-r\/\" target=\"_blank\" rel=\"noopener\">Specifieke rijen toevoegen in R (met voorbeelden)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>De functie rowSums() in R kan worden gebruikt om de som van de waarden van elke rij van een matrix of dataframe in R te berekenen. Deze functie gebruikt de volgende basissyntaxis: rowSums(x, na.rm=FALSE) Goud: x : Naam van het matrix- of datablok. na.rm : of NA-waarden moeten worden genegeerd. De standaardwaarde is false. De [&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-1876","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 de functie rowSums() te gebruiken in R \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u de functie rowSums() in R gebruikt, 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\/rijsommen-functioneren-in-r\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe de functie rowSums() te gebruiken in R \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u de functie rowSums() in R gebruikt, met verschillende voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-24T15:28:21+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\/rijsommen-functioneren-in-r\/\",\"url\":\"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/\",\"name\":\"Hoe de functie rowSums() te gebruiken in R \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-24T15:28:21+00:00\",\"dateModified\":\"2023-07-24T15:28:21+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u de functie rowSums() in R gebruikt, met verschillende voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/rijsommen-functioneren-in-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe de functie rowsums() in r te gebruiken\"}]},{\"@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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