{"id":1119,"date":"2023-07-27T14:29:51","date_gmt":"2023-07-27T14:29:51","guid":{"rendered":"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/"},"modified":"2023-07-27T14:29:51","modified_gmt":"2023-07-27T14:29:51","slug":"wyodrebnij-rok-z-daty-w-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/","title":{"rendered":"Jak wyodr\u0119bni\u0107 rok z daty w r (z przyk\u0142adami)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Istniej\u0105 dwa sposoby szybkiego wyodr\u0119bnienia roku z daty w R:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Metoda 1: U\u017cyj formatu()<\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df$year &lt;- format( <span style=\"color: #3366ff;\">as.Date<\/span> (df$date, format=\" <span style=\"color: #008000;\">%d\/%m\/%Y<\/span> \"),\" <span style=\"color: #008000;\">%Y<\/span> \")\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Metoda 2: U\u017cyj pakietu <a href=\"https:\/\/lubridate.tidyverse.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">smarowania<\/a><\/strong><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #993300;\">library<\/span> (lubridate)\n\ndf$year &lt;- year( <span style=\"color: #3366ff;\">mdy<\/span> (df$date))\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">W tym samouczku przedstawiono przyk\u0142ad wykorzystania ka\u017cdej z tych metod w praktyce.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Metoda 1: Wyodr\u0119bnij rok z daty za pomoc\u0105 format()<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak wyodr\u0119bni\u0107 rok z daty za pomoc\u0105 funkcji <strong>format()<\/strong> po\u0142\u0105czonej z argumentem <strong>\u201e%Y\u201d<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(date=c(\"01\/01\/2021\", \"01\/04\/2021\" , \"01\/09\/2021\"),\n                  sales=c(34, 36, 44))\n\n<span style=\"color: #008080;\">#view data frame<\/span>\ndf\n\n        dirty dates\n1 01\/01\/2021 34\n2 01\/04\/2021 36\n3 01\/09\/2021 44\n\n<span style=\"color: #008080;\">#create new variable that contains year\n<\/span>df$year &lt;- format( <span style=\"color: #3366ff;\">as.Date<\/span> (df$date, format=\" <span style=\"color: #008000;\">%d\/%m\/%Y<\/span> \"),\" <span style=\"color: #008000;\">%Y<\/span> \")\n\n<span style=\"color: #008080;\">#view new data frame<\/span>\ndf\n\n        date sales year\n1 01\/01\/2021 34 2021\n2 01\/04\/2021 36 2021\n3 01\/09\/2021 44 2021\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Nale\u017cy pami\u0119ta\u0107, \u017ce ta funkcja <strong>format()<\/strong> dzia\u0142a z r\u00f3\u017cnymi formatami dat. Wystarczy okre\u015bli\u0107 format:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(date=c(\"2021-01-01\", \"2021-01-04\", \"2021-01-09\"),\n                  sales=c(34, 36, 44))\n\n<span style=\"color: #008080;\">#view data frame<\/span>\ndf\n\n        dirty date\n1 2021-01-01 34\n2 2021-01-04 36\n3 2021-01-09 44\n\n<span style=\"color: #008080;\">#create new variable that contains year\n<\/span>df$year &lt;- format( <span style=\"color: #3366ff;\">as.Date<\/span> (df$date, format=\" <span style=\"color: #008000;\">%Y-%m-%d<\/span> \"),\" <span style=\"color: #008000;\">%Y<\/span> \")\n\n<span style=\"color: #008080;\">#view new data frame<\/span>\ndf\n\n        date sales year\n1 01\/01\/2021 34 2021\n2 01\/04\/2021 36 2021\n3 01\/09\/2021 44 2021<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Metoda 2: Wyodr\u0119bnij rok z daty za pomoc\u0105 Lubridate<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c u\u017cy\u0107 funkcji pakietu lubridate, aby szybko wyodr\u0119bni\u0107 rok z daty:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #993300;\">library<\/span> (lubridate)<\/span>\n\n#create data frame<\/span>\ndf &lt;- data.frame(date=c(\"01\/01\/2021\", \"01\/04\/2021\" , \"01\/09\/2021\"),\n                  sales=c(34, 36, 44))\n\n<span style=\"color: #008080;\">#view data frame<\/span>\ndf\n\n        dirty dates\n1 01\/01\/2021 34\n2 01\/04\/2021 36\n3 01\/09\/2021 44\n\n<span style=\"color: #008080;\">#create new variable that contains year\n<\/span>df$year &lt;- year( <span style=\"color: #3366ff;\">mdy<\/span> (df$date))\n\n<span style=\"color: #008080;\">#view new data frame<\/span>\ndf\n\n        date sales year\n1 01\/01\/2021 34 2021\n2 01\/04\/2021 36 2021\n3 01\/09\/2021 44 2021<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Lubridate dzia\u0142a r\u00f3wnie\u017c z r\u00f3\u017cnymi formatami daty. Wystarczy okre\u015bli\u0107 format:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(date=c(\"2021-01-01\", \"2021-01-04\", \"2021-01-09\"),\n                  sales=c(34, 36, 44))\n\n<span style=\"color: #008080;\">#view data frame<\/span>\ndf\n\n        dirty dates\n1 2021-01-01 34\n2 2021-01-04 36\n3 2021-01-09 44\n\n<span style=\"color: #008080;\">#create new variable that contains year\n<\/span>df$year &lt;- year( <span style=\"color: #3366ff;\">ymd<\/span> (df$date))\n\n<span style=\"color: #008080;\">#view new data frame<\/span>\ndf\n\n        date sales year\n1 01\/01\/2021 34 2021\n2 01\/04\/2021 36 2021\n3 01\/09\/2021 44 2021<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017csze samouczki wyja\u015bniaj\u0105, jak wykonywa\u0107 inne typowe operacje w j\u0119zyku R:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pl\/r-zapetl-kolumny-ramki-danych\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jak iterowa\u0107 po nazwach kolumn w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/usun-wartosci-odstajace-z-wielu-kolumn-w-r\/\" target=\"_blank\" rel=\"noopener noreferrer\">Jak usun\u0105\u0107 warto\u015bci odstaj\u0105ce z wielu kolumn w R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Istniej\u0105 dwa sposoby szybkiego wyodr\u0119bnienia roku z daty w R: Metoda 1: U\u017cyj formatu() df$year &lt;- format( as.Date (df$date, format=&#8221; %d\/%m\/%Y &#8222;),&#8221; %Y &#8222;) Metoda 2: U\u017cyj pakietu smarowania library (lubridate) df$year &lt;- year( mdy (df$date)) W tym samouczku przedstawiono przyk\u0142ad wykorzystania ka\u017cdej z tych metod w praktyce. Metoda 1: Wyodr\u0119bnij rok z daty za [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1119","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Jak wyodr\u0119bni\u0107 rok z daty w R (z przyk\u0142adami) - Statorials<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak wyodr\u0119bni\u0107 rok z daty w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\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\/pl\/wyodrebnij-rok-z-daty-w-r\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jak wyodr\u0119bni\u0107 rok z daty w R (z przyk\u0142adami) - Statorials\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono, jak wyodr\u0119bni\u0107 rok z daty w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-27T14:29:51+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napisane przez\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Szacowany czas czytania\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/\",\"url\":\"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/\",\"name\":\"Jak wyodr\u0119bni\u0107 rok z daty w R (z przyk\u0142adami) - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-27T14:29:51+00:00\",\"dateModified\":\"2023-07-27T14:29:51+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono, jak wyodr\u0119bni\u0107 rok z daty w j\u0119zyku R, podaj\u0105c kilka przyk\u0142ad\u00f3w.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/wyodrebnij-rok-z-daty-w-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Jak wyodr\u0119bni\u0107 rok z daty w r (z przyk\u0142adami)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pl\/#website\",\"url\":\"https:\/\/statorials.org\/pl\/\",\"name\":\"Statorials\",\"description\":\"Tw\u00f3j przewodnik po kompetencjach statystycznych!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pl-PL\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\",\"name\":\"Benjamin Anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pl-PL\",\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pl\/wp-content\/uploads\/2023\/11\/Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin Anderson\"},\"description\":\"Cze\u015b\u0107, jestem Benjamin i jestem emerytowanym profesorem statystyki, kt\u00f3ry zosta\u0142 oddanym nauczycielem Statorials. 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