{"id":21083,"date":"2023-11-21T15:13:04","date_gmt":"2023-11-21T15:13:04","guid":{"rendered":"https:\/\/datasciencepartners.nl\/?p=21083"},"modified":"2025-07-14T09:31:09","modified_gmt":"2025-07-14T09:31:09","slug":"r-vector","status":"publish","type":"post","link":"https:\/\/datasciencepartners.nl\/r-vector\/","title":{"rendered":"Een R Vector: wat is het en wat kan ik er mee? Uitleg &#038; Tutorial"},"content":{"rendered":"<div class=\"vgblk-rw-wrapper limit-wrapper\">\n<p>In dit blog gaan we in op het datatype <strong>&quot;vector&quot;<\/strong> in R. Het is een verdieping op ons artikel over <a href=\"https:\/\/datasciencepartners.nl\/data-types-r\/\">Datatypes in R<\/a>.<\/p>\n<p>Het blog is een onderdeel van een blogserie over <a href=\"https:\/\/datasciencepartners.nl\/wat-is-r\/\">R<\/a> waarin we o.a. ingaan op hoe je <a href=\"https:\/\/datasciencepartners.nl\/r-installeren\/\">R installeert<\/a>, hoe je in <a href=\"https:\/\/datasciencepartners.nl\/rstudio\/\">RStudio<\/a> werkt, verschillende <a href=\"https:\/\/datasciencepartners.nl\/read-data-r\/\" title=\"soorten datasets uitleest in R\">soorten datasets uitleest in R<\/a>, data manipuleert met bijvoorbeeld <a href=\"https:\/\/datasciencepartners.nl\/dplyr-r\/\">dplyr<\/a> of <a href=\"https:\/\/datasciencepartners.nl\/data-table-package-in-r-wat-is-het\/\">data.table<\/a>, of data visualiseert in bijvoorbeeld een <a href=\"https:\/\/datasciencepartners.nl\/r-histogram\/\">histogram<\/a> of <a href=\"https:\/\/datasciencepartners.nl\/r-boxplot\/\">boxplot<\/a>.<\/p>\n<\/p>\n<!-- This site is converting visitors into subscribers and customers with OptinMonster - https:\/\/optinmonster.com :: Campaign Title: Cheatsheet R -->\n<div id=\"om-kllwyvg0bcxyzsjvh1il-holder\"><\/div>\n<script>(function(d,u,ac){var s=d.createElement('script');s.type='text\/javascript';s.src='https:\/\/a.omappapi.com\/app\/js\/api.min.js';s.async=true;s.dataset.user=u;s.dataset.campaign=ac;d.getElementsByTagName('head')[0].appendChild(s);})(document,77079,'kllwyvg0bcxyzsjvh1il');<\/script>\n<!-- \/ OptinMonster -->\n<h2>1. Wat is een R vector?<\/h2>\n<blockquote>\n<p>Een vector is een <strong>eendimensionale<\/strong> verzameling van <strong>meerdere elementen<\/strong> (waarden) van <strong>hetzelfde datatype<\/strong>, bewaard in <strong>\u00e9\u00e9n variabele<\/strong>.<\/p>\n<\/blockquote>\n<p>Een vector lijkt erg op een list. Een <a href=\"https:\/\/datasciencepartners.nl\/r-list\/\" title=\"R list\">R list<\/a> kan echter meerdere datatypes binnen dezelfde lijst bevatten.<\/p>\n<p>Voorbeelden van vectors:<\/p>\n<ul>\n<li>Een lijst met leeftijden.<\/li>\n<li>Een lijst met namen van steden.<\/li>\n<\/ul>\n<hr \/>\n<div class=\"blogBanner\">Met vertrouwen waardevolle inzichten halen uit data met R? Bekijk dan onze opleiding R voor data analyse.<\/p>\n<p><a href=\"https:\/\/datasciencepartners.nl\/opleiding-r\/\"><button>Opleiding R<\/button><\/a>\n<\/div>\n<h2>2. Een vector aanmaken<\/h2>\n<p>De <strong>syntax<\/strong> om een vector aan te maken is als volgt:<\/p>\n<p><code>&lt;variabele&gt; &lt;- c(&lt;waarde 1&gt;, ..., &lt;waarde n&gt;)<\/code><\/p>\n<p>De <a href=\"https:\/\/www.rdocumentation.org\/packages\/base\/topics\/c\"><code>c<\/code><\/a> is een functie en staat voor <strong>combine<\/strong>.<\/p>\n<p>Zie onderstaand voorbeeld:<\/p>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\ncity_names<\/code><\/pre>\n<pre><code>[1] &quot;Amsterdam&quot; &quot;Utrecht&quot;   &quot;Rotterdam&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot;<\/code><\/pre>\n<p>Met functie <a href=\"https:\/\/www.rdocumentation.org\/packages\/methods\/topics\/is\"><code>is()<\/code><\/a> bekijken we het datatype:<\/p>\n<pre><code class=\"language-r\">is(city_names)<\/code><\/pre>\n<pre><code>[1] &quot;character&quot;           &quot;vector&quot;              &quot;data.frameRowLabels&quot;\n[4] &quot;SuperClassMethod&quot;<\/code><\/pre>\n<ul>\n<li>\n<p>We zien <code>&quot;vector&quot;<\/code><\/p>\n<\/li>\n<li>\n<p><code>&quot;character&quot;<\/code> geeft aan dat de elementen in de vector tekst zijn<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>3. Eigenschappen van een vector<\/h2>\n<p>We hebben gezien dat een vector <strong>meerdere elementen<\/strong> kan bevatten.<\/p>\n<hr \/>\n<h3>3.1. <strong>E\u00e9n<\/strong> datatype<\/h3>\n<p>De elementen kunnen slechts van <strong>\u00e9\u00e9n<\/strong> datatype zijn.<\/p>\n<p>Zie onderstaand voorbeeld:<\/p>\n<pre><code class=\"language-r\">ages &lt;- c(&quot;five&quot;, 10, 34, 66, &quot;sixteen&quot;)\n\nages<\/code><\/pre>\n<pre><code>[1] &quot;five&quot;    &quot;10&quot;      &quot;34&quot;      &quot;66&quot;      &quot;sixteen&quot;<\/code><\/pre>\n<p>Je ziet dat alle elementen nu worden gezien als <strong>character<\/strong> (tekst).<\/p>\n<hr \/>\n<h3>3.2. <strong>E\u00e9n<\/strong> dimensie<\/h3>\n<p>Een vector kan slechts uit 1 dimensie bestaan.<\/p>\n<p>Wanneer je als elementen weer vectoren zou gebruiken, wordt dit alsnog een <strong>een-dimensionale vector<\/strong>:<\/p>\n<pre><code class=\"language-r\">ages &lt;- c(c(&quot;five&quot;, &quot;sixteen&quot;), c(10, 34, 66))\n\nages<\/code><\/pre>\n<pre><code>[1] &quot;five&quot;    &quot;sixteen&quot; &quot;10&quot;      &quot;34&quot;      &quot;66&quot;<\/code><\/pre>\n<hr \/>\n<h2>4. Elementen selecteren<\/h2>\n<p>Ieder element heeft een <strong>index<\/strong>-nummer.<\/p>\n<p>Zie onderstaand voorbeeld:<\/p>\n<p><code>city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)<\/code><\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th style=\"text-align: center;\"><strong><code>&quot;Amsterdam&quot;<\/code><\/strong><\/th>\n<th style=\"text-align: center;\"><code>&quot;Utrecht&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Rotterdam&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Den Haag&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Eindhoven&quot;<\/code><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>index<\/strong><\/td>\n<td style=\"text-align: center;\">1<\/td>\n<td style=\"text-align: center;\">2<\/td>\n<td style=\"text-align: center;\">3<\/td>\n<td style=\"text-align: center;\">4<\/td>\n<td style=\"text-align: center;\">5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Dit heet <strong>1-based indexing<\/strong>, omdat 1 het eerste nummer is.<\/p>\n<hr \/>\n<h3>4.1. E\u00e9n element selecteren<\/h3>\n<p>Een element selecteer je met de volgende syntax:<\/p>\n<p><code>&lt;individueel_element&gt; &lt;- &lt;vector_variabele&gt;[&lt;indexnummer&gt;]<\/code><\/p>\n<p>Zie onderstaand voorbeeld:<\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th style=\"text-align: center;\"><strong><code>&quot;Amsterdam&quot;<\/code><\/strong><\/th>\n<th style=\"text-align: center;\"><code>&quot;Utrecht&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Rotterdam&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Den Haag&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Eindhoven&quot;<\/code><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>index<\/strong><\/td>\n<td style=\"text-align: center;\">1<\/td>\n<td style=\"text-align: center;\">2<\/td>\n<td style=\"text-align: center;\">3<\/td>\n<td style=\"text-align: center;\">4<\/td>\n<td style=\"text-align: center;\">5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\ncity_names[3]<\/code><\/pre>\n<pre><code>[1] &quot;Rotterdam&quot;<\/code><\/pre>\n<hr \/>\n<h3>4.2. Meerdere elementen selecteren<\/h3>\n<p>Meerdere elementen selecteer je met de volgende syntax:<\/p>\n<p><code>&lt;elementen&gt; &lt;- &lt;vector_variabele&gt;[&lt;indexnummer_start&gt;:&lt;indexnummer_stop&gt;]<\/code><\/p>\n<p>Zie onderstaand voorbeeld:<\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th style=\"text-align: center;\"><strong><code>&quot;Amsterdam&quot;<\/code><\/strong><\/th>\n<th style=\"text-align: center;\"><code>&quot;Utrecht&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Rotterdam&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Den Haag&quot;<\/code><\/th>\n<th style=\"text-align: center;\"><code>&quot;Eindhoven&quot;<\/code><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>index<\/strong><\/td>\n<td style=\"text-align: center;\">1<\/td>\n<td style=\"text-align: center;\">2<\/td>\n<td style=\"text-align: center;\">3<\/td>\n<td style=\"text-align: center;\">4<\/td>\n<td style=\"text-align: center;\">5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\ncity_names[3:5]<\/code><\/pre>\n<pre><code>[1] &quot;Rotterdam&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot;<\/code><\/pre>\n<hr \/>\n<h2>5. Vectors aanpassen<\/h2>\n<p>We bekijken de volgende aanpassingen:<\/p>\n<ol>\n<li>\n<p>Elementen <strong>aanpassen<\/strong><\/p>\n<\/li>\n<li>\n<p>Elementen <strong>toevoegen<\/strong><\/p>\n<\/li>\n<li>\n<p>Elementen <strong>verwijderen<\/strong><\/p>\n<\/li>\n<\/ol>\n<hr \/>\n<h3>5.1. Elementen aanpassen<\/h3>\n<h4>5.1.1. E\u00e9n element aanpassen<\/h4>\n<p>Je past \u00e9\u00e9n element als volgt aan:<\/p>\n<ul>\n<li>Verwijs naar de index van de element<\/li>\n<li>Wijs een nieuwe waarde toe<\/li>\n<\/ul>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\ncity_names[2] &lt;- &quot;Tilburg&quot;\n\ncity_names<\/code><\/pre>\n<pre><code>[1] &quot;Amsterdam&quot; &quot;Tilburg&quot;   &quot;Rotterdam&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot;<\/code><\/pre>\n<hr \/>\n<h4>5.1.2. Meerdere elementen aanpassen<\/h4>\n<ul>\n<li>Ook hier verwijs je naar de index<\/li>\n<li>Met een vector geef je nieuwe waarden op<\/li>\n<\/ul>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\ncity_names[2:3] &lt;- c(&quot;Tilburg&quot;, &quot;Groningen&quot;)\n\ncity_names<\/code><\/pre>\n<pre><code>[1] &quot;Amsterdam&quot; &quot;Tilburg&quot;   &quot;Groningen&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot;<\/code><\/pre>\n<hr \/>\n<h3>5.2. Elementen toevoegen<\/h3>\n<p>Elementen voeg je toe door een <strong>nieuwe vector<\/strong> <code>c()<\/code> te maken.<\/p>\n<p>Zie onderstaand voorbeeld:<\/p>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\nadditional_city_names &lt;- c(&quot;Tilburg&quot;, &quot;Groningen&quot;)\n\nall_city_names &lt;- c(city_names, additional_city_names)\n\nall_city_names<\/code><\/pre>\n<pre><code>[1] &quot;Amsterdam&quot; &quot;Utrecht&quot;   &quot;Rotterdam&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot; &quot;Tilburg&quot;  \n[7] &quot;Groningen&quot;<\/code><\/pre>\n<hr \/>\n<h3>5.3. Elementen verwijderen<\/h3>\n<p>Door gebruik te maken van de <strong>index<\/strong> kunnen we elementen <strong>selecteren<\/strong>:<\/p>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\ncity_names[2]<\/code><\/pre>\n<pre><code>[1] &quot;Utrecht&quot;<\/code><\/pre>\n<p>Door een minteken <code>-<\/code> voor het indexnummer te plaatsen verwijder je een element:<\/p>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\nfiltered_city_names &lt;- city_names[-2]\n\nfiltered_city_names<\/code><\/pre>\n<pre><code>[1] &quot;Amsterdam&quot; &quot;Rotterdam&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot;<\/code><\/pre>\n<p>Als je meerdere elementen wilt verwijderen benoem je de indexnummers tussen ronde haken <code>()<\/code>:<\/p>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\nfiltered_city_names &lt;- city_names[-(2:3)]\n\nfiltered_city_names<\/code><\/pre>\n<pre><code>[1] &quot;Amsterdam&quot; &quot;Den Haag&quot;  &quot;Eindhoven&quot;<\/code><\/pre>\n<hr \/>\n<h2>6. Aantal elementen in een vector<\/h2>\n<ul>\n<li>R kent de functie <a href=\"https:\/\/www.rdocumentation.org\/packages\/base\/topics\/length\"><code>length()<\/code><\/a>.<\/li>\n<li>Daarmee verkrijg je het <strong>aantal elementen<\/strong> van een vector.<\/li>\n<\/ul>\n<pre><code class=\"language-r\">city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;, &quot;Den Haag&quot;, &quot;Eindhoven&quot;)\n\nlength(city_names)<\/code><\/pre>\n<pre><code>[1] 5<\/code><\/pre>\n<hr \/>\n<h2>R Vector: om te onthouden<\/h2>\n<ul>\n<li>Een vector bevat <strong>meerdere elementen<\/strong> (waarden),\n<ul>\n<li>Van <strong>hetzelfde datatype<\/strong><\/li>\n<li>Eendimensionaal<\/li>\n<\/ul>\n<\/li>\n<li>Voorbeeld:\n<ul>\n<li><code>city_names &lt;- c(&quot;Amsterdam&quot;, &quot;Utrecht&quot;, &quot;Rotterdam&quot;)<\/code><\/li>\n<\/ul>\n<\/li>\n<li>Elementen <strong>selecteren<\/strong>\n<ul>\n<li><strong>1-based indexing<\/strong><\/li>\n<li>Voorbeeld: <code>city_names[1]<\/code> of <code>city_names[2:3]<\/code><\/li>\n<\/ul>\n<\/li>\n<li>Vector <strong>aanpassen<\/strong>\n<ul>\n<li>Elementen aanpassen: gebruik <strong>indexnummer<\/strong>, bijvoorbeeld: <code>city_names[1] &lt;- &quot;Tilburg&quot;<\/code><\/li>\n<li>Elementen <strong>toevoegen<\/strong>: gebruik een nieuwe vector, bijvoorbeeld: <code>all_city_names &lt;- c(city_names, c(&quot;Tilburg&quot;))<\/code><\/li>\n<li>Elementen <strong>verwijderen<\/strong>: gebruik het minteken en indexnummer, bijvoorbeeld: <code>city_names[-1]<\/code><\/li>\n<\/ul>\n<\/li>\n<li><strong>Aantal<\/strong> elementen: gebruik functie <a href=\"https:\/\/www.rdocumentation.org\/packages\/base\/topics\/length\"><code>length()<\/code><\/a>, bijvoorbeeld: <code>length(city_names)<\/code><\/li>\n<\/ul>\n<hr \/>\n<p><strong>Wil jij goed leren werken in R? Tijdens onze <a href=\"https:\/\/datasciencepartners.nl\/opleiding-r\/\">Opleiding R<\/a> leer je alles wat je nodig hebt om zelfstandig analyses uit te voeren in R.<\/strong><\/p>\n<\/div>\n<p><!-- .vgblk-rw-wrapper --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In dit blog gaan we in op het datatype &quot;vector&quot; in R. Het is een verdieping op ons artikel over Datatypes in R. Het blog is een onderdeel van een blogserie over R waarin we o.a. ingaan op hoe je R installeert, hoe je in RStudio werkt, verschillende soorten datasets uitleest in R, data manipuleert&#8230;<\/p>\n","protected":false},"author":4,"featured_media":21089,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[118,112],"tags":[],"class_list":["post-21083","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-r","category-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Een R Vector: wat is het en wat kan ik er mee? 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