{"id":1974,"date":"2023-07-24T05:52:50","date_gmt":"2023-07-24T05:52:50","guid":{"rendered":"https:\/\/statorials.org\/pl\/podzbior-ramki-danych-w-r\/"},"modified":"2023-07-24T05:52:50","modified_gmt":"2023-07-24T05:52:50","slug":"podzbior-ramki-danych-w-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/podzbior-ramki-danych-w-r\/","title":{"rendered":"Jak podzieli\u0107 ramk\u0119 danych w r (4 przyk\u0142ady)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Do podzbioru ramki danych w R mo\u017cna u\u017cy\u0107 nast\u0119puj\u0105cej podstawowej sk\u0142adni:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df[rows, columns]<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Poni\u017csze przyk\u0142ady pokazuj\u0105, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce z nast\u0119puj\u0105c\u0105 ramk\u0105 danych:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (team=c('A', 'A', 'B', 'B', 'C', 'C', 'C'),\n                 points=c(77, 81, 89, 83, 99, 92, 97),\n                 assists=c(19, 22, 29, 15, 32, 39, 14))\n\n<span style=\"color: #008080;\">#view data frame<\/span>\ndf\n\n  team points assists\n1 A 77 19\n2 A 81 22\n3 B 89 29\n4 B 83 15\n5 C 99 32\n6 C 92 39\n7 C 97 14\n<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 1: Podzbi\u00f3r ramki danych poprzez wybranie kolumn<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak podzieli\u0107 ramk\u0119 danych na podstawie nazw kolumn:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select all rows for columns 'team' and 'assists'\n<span style=\"color: #000000;\">df[, c(' <span style=\"color: #ff0000;\">team<\/span> ', ' <span style=\"color: #ff0000;\">assists<\/span> ')]<\/span>\n<\/span>\n  team assists\n1 to 19\n2 to 22\n3 B 29\n4 B 15\n5 C 32\n6 C 39\n7 C 14\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c podzieli\u0107 ramk\u0119 danych wed\u0142ug warto\u015bci indeks\u00f3w kolumn:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select all rows for columns 1 and 3\n<span style=\"color: #000000;\">df[, c(1, 3)]\n<\/span><\/span>\n  team assists\n1 to 19\n2 to 22\n3 B 29\n4 B 15\n5 C 32\n6 C 39\n7 C 14<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 2: Podzbi\u00f3r ramki danych z wy\u0142\u0105czeniem kolumn<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak podzieli\u0107 ramk\u0119 danych na podzbi\u00f3r, wykluczaj\u0105c okre\u015blone nazwy kolumn:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define columns to exclude\n<span style=\"color: #000000;\">cols &lt;- names(df) <span style=\"color: #3366ff;\">%in%<\/span> c(' <span style=\"color: #ff0000;\">points<\/span> ')<\/span>\n<span style=\"color: #000000;\">\n<span style=\"color: #008080;\">#exclude points column<\/span>\ndf[!cols]<\/span>\n<\/span>\n  team assists\n1 to 19\n2 to 22\n3 B 29\n4 B 15\n5 C 32\n6 C 39\n7 C 14\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c wykluczy\u0107 kolumny, korzystaj\u0105c z warto\u015bci indeks\u00f3w<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#exclude column 2\n<span style=\"color: #000000;\">df[, c(-2)]\n<\/span><\/span>\n  team assists\n1 to 19\n2 to 22\n3 B 29\n4 B 15\n5 C 32\n6 C 39\n7 C 14<\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 3: Podzbi\u00f3r ramki danych poprzez wybranie wierszy<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak podzieli\u0107 ramk\u0119 danych na podzbi\u00f3r wed\u0142ug okre\u015blonych wierszy:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows 1, 5, and 7<\/span>\n<span style=\"color: #000000;\">df[c(1, 5, 7), ]\n\n  team points assists\n1 A 77 19\n5 C 99 32\n7 C 97 14<\/span>\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c podzieli\u0107 ramk\u0119 danych, wybieraj\u0105c zakres wierszy:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows 1 through 5<\/span>\n<span style=\"color: #000000;\">df[1:5, ]\n\n  team points assists\n1 A 77 19\n2 A 81 22\n3 B 89 29\n4 B 83 15\n5 C 99 32<\/span><\/strong><\/pre>\n<h3> <strong>Przyk\u0142ad 4: Podzbi\u00f3r ramki danych w oparciu o warunki<\/strong><\/h3>\n<p> <span style=\"color: #000000;\">Poni\u017cszy kod pokazuje, jak u\u017cywa\u0107 funkcji <strong>subset()<\/strong> do wybierania wierszy i kolumn spe\u0142niaj\u0105cych okre\u015blone warunki:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows where points is greater than 90\n<span style=\"color: #000000;\">subset(df, points &gt; 90)\n\n  team points assists\n5 C 99 32\n6 C 92 39\n7 C 97 14\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Mo\u017cemy tak\u017ce u\u017cy\u0107 <strong>|<\/strong> Operator (\u201elub\u201d) wybieraj\u0105cy wiersze spe\u0142niaj\u0105ce jeden z poni\u017cszych warunk\u00f3w:<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows where points is greater than 90 or less than 80\n<span style=\"color: #000000;\">subset(df, points &gt; 90 | points &lt; 80)\n\n  team points assists\n1 A 77 19\n5 C 99 32\n6 C 92 39\n7 C 97 14<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Mo\u017cemy tak\u017ce u\u017cy\u0107 operatora <strong>&amp;<\/strong> (\u201ei\u201d), aby wybra\u0107 wiersze spe\u0142niaj\u0105ce wiele warunk\u00f3w:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows where points is greater than 90 <em>and<\/em> assists is greater than 30\n<span style=\"color: #000000;\">subset(df, points &gt; 90 &amp; assists &gt; 30)\n\n  team points assists\n5 C 99 32\n6 C 92 39<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Mo\u017cemy r\u00f3wnie\u017c u\u017cy\u0107 argumentu Select, aby wybra\u0107 tylko okre\u015blone kolumny na podstawie warunku:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#select rows where points is greater than 90 and only show 'team' column\n<span style=\"color: #000000;\">subset(df, points &gt; 90, select=c(' <span style=\"color: #ff0000;\">team<\/span> '))\n\n  team\n5C\n6C\n7C<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pl\/r-warunek-usuniecia-linii-z-ramki-danych\/\" target=\"_blank\" rel=\"noopener\">Jak usun\u0105\u0107 wiersze z ramki danych w R na podstawie warunku<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/zamien-wartosci-w-ramce-danych-r\/\" target=\"_blank\" rel=\"noopener\">Jak zamieni\u0107 warto\u015bci w ramce danych w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/r-kolumna-toczna\/\" target=\"_blank\" rel=\"noopener\">Jak usun\u0105\u0107 kolumny z ramki danych w R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Do podzbioru ramki danych w R mo\u017cna u\u017cy\u0107 nast\u0119puj\u0105cej podstawowej sk\u0142adni: df[rows, columns] Poni\u017csze przyk\u0142ady pokazuj\u0105, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce z nast\u0119puj\u0105c\u0105 ramk\u0105 danych: #create data frame df &lt;- data. frame (team=c(&#8217;A&#8217;, 'A&#8217;, 'B&#8217;, 'B&#8217;, 'C&#8217;, 'C&#8217;, 'C&#8217;), points=c(77, 81, 89, 83, 99, 92, 97), assists=c(19, 22, 29, 15, 32, 39, 14)) #view [&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-1974","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 podzieli\u0107 ramk\u0119 danych na podzbi\u00f3r w R (4 przyk\u0142ady) - Statologia<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono, jak podzieli\u0107 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