{"id":17487,"date":"2024-03-15T15:05:30","date_gmt":"2024-03-15T15:05:30","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/"},"modified":"2024-03-21T11:01:26","modified_gmt":"2024-03-21T11:01:26","slug":"how-to-extract-duplicate-items-from-a-column-in-r-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/","title":{"rendered":"How to extract duplicate items from a column in R language?"},"content":{"rendered":"<p>You can utilize the unique() function in R language to extract duplicate items from a column.<\/p>\n<p>The unique() function can return a vector that contains all the unique values in the given vector.<\/p>\n<p>Here is a sample code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\"># \u521b\u5efa\u4e00\u4e2a\u5411\u91cf<\/span>\r\nvec <span class=\"hljs-operator\">&lt;-<\/span> <span class=\"hljs-built_in\">c<\/span><span class=\"hljs-punctuation\">(<\/span><span class=\"hljs-number\">1<\/span><span class=\"hljs-punctuation\">,<\/span> <span class=\"hljs-number\">2<\/span><span class=\"hljs-punctuation\">,<\/span> <span class=\"hljs-number\">3<\/span><span class=\"hljs-punctuation\">,<\/span> <span class=\"hljs-number\">2<\/span><span class=\"hljs-punctuation\">,<\/span> <span class=\"hljs-number\">4<\/span><span class=\"hljs-punctuation\">,<\/span> <span class=\"hljs-number\">4<\/span><span class=\"hljs-punctuation\">,<\/span> <span class=\"hljs-number\">5<\/span><span class=\"hljs-punctuation\">)<\/span>\r\n\r\n<span class=\"hljs-comment\"># \u4f7f\u7528unique()\u51fd\u6570\u63d0\u53d6\u51fa\u91cd\u590d\u9879<\/span>\r\nduplicate_items <span class=\"hljs-operator\">&lt;-<\/span> vec<span class=\"hljs-punctuation\">[<\/span>duplicated<span class=\"hljs-punctuation\">(<\/span>vec<span class=\"hljs-punctuation\">)<\/span><span class=\"hljs-punctuation\">]<\/span>\r\n\r\n<span class=\"hljs-comment\"># \u8f93\u51fa\u7ed3\u679c<\/span>\r\nprint<span class=\"hljs-punctuation\">(<\/span>duplicate_items<span class=\"hljs-punctuation\">)<\/span>\r\n<\/code><\/pre>\n<p>The output is:<\/p>\n<pre class=\"post-pre\"><code>[1] 2 4\r\n<\/code><\/pre>\n<p>In the above example, we start by creating a vector &#8216;vec&#8217; containing duplicated elements. Then we use the function &#8216;duplicated()&#8217; to check for any duplicates in the vector, which returns a logical vector indicating whether each element is a duplicate. Finally, we extract the duplicate elements by using the result of &#8216;duplicated()&#8217; as an index, and store them in a vector called &#8216;duplicate_items&#8217;.<\/p>\n<p>\nNote that if you only want to identify the unique values of repeated elements in a vector, without caring about their frequency or position, you can use the duplicated() function to determine if there are any duplicates, and then use the unique() function to extract those duplicates.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You can utilize the unique() function in R language to extract duplicate items from a column. The unique() function can return a vector that contains all the unique values in the given vector. Here is a sample code: # \u521b\u5efa\u4e00\u4e2a\u5411\u91cf vec &lt;- c(1, 2, 3, 2, 4, 4, 5) # \u4f7f\u7528unique()\u51fd\u6570\u63d0\u53d6\u51fa\u91cd\u590d\u9879 duplicate_items &lt;- vec[duplicated(vec)] # [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-17487","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to extract duplicate items from a column in R language? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to extract duplicate items from a column in R language?\" \/>\n<meta property=\"og:description\" content=\"You can utilize the unique() function in R language to extract duplicate items from a column. The unique() function can return a vector that contains all the unique values in the given vector. Here is a sample code: # \u521b\u5efa\u4e00\u4e2a\u5411\u91cf vec &lt;- c(1, 2, 3, 2, 4, 4, 5) # \u4f7f\u7528unique()\u51fd\u6570\u63d0\u53d6\u51fa\u91cd\u590d\u9879 duplicate_items &lt;- vec[duplicated(vec)] # [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T15:05:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T11:01:26+00:00\" \/>\n<meta name=\"author\" content=\"Jackson Davis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jackson Davis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/\"},\"author\":{\"name\":\"Jackson Davis\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/55a10b8b0457c35884c25677889ad350\"},\"headline\":\"How to extract duplicate items from a column in R language?\",\"datePublished\":\"2024-03-15T15:05:30+00:00\",\"dateModified\":\"2024-03-21T11:01:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/\"},\"wordCount\":163,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/\",\"name\":\"How to extract duplicate items from a column in R language? 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- Blog - Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/","og_locale":"en_US","og_type":"article","og_title":"How to extract duplicate items from a column in R language?","og_description":"You can utilize the unique() function in R language to extract duplicate items from a column. The unique() function can return a vector that contains all the unique values in the given vector. Here is a sample code: # \u521b\u5efa\u4e00\u4e2a\u5411\u91cf vec &lt;- c(1, 2, 3, 2, 4, 4, 5) # \u4f7f\u7528unique()\u51fd\u6570\u63d0\u53d6\u51fa\u91cd\u590d\u9879 duplicate_items &lt;- vec[duplicated(vec)] # [&hellip;]","og_url":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-15T15:05:30+00:00","article_modified_time":"2024-03-21T11:01:26+00:00","author":"Jackson Davis","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Jackson Davis","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/"},"author":{"name":"Jackson Davis","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/55a10b8b0457c35884c25677889ad350"},"headline":"How to extract duplicate items from a column in R language?","datePublished":"2024-03-15T15:05:30+00:00","dateModified":"2024-03-21T11:01:26+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/"},"wordCount":163,"commentCount":0,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/","url":"https:\/\/www.silicloud.com\/blog\/how-to-extract-duplicate-items-from-a-column-in-r-language\/","name":"How to extract duplicate items from a column in R language? 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