{"id":3907,"date":"2023-07-14T20:10:46","date_gmt":"2023-07-14T20:10:46","guid":{"rendered":"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/"},"modified":"2023-07-14T20:10:46","modified_gmt":"2023-07-14T20:10:46","slug":"r-if_else-vs-ifelse","status":"publish","type":"post","link":"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/","title":{"rendered":"Odp.: r\u00f3\u017cnica mi\u0119dzy ifelse() i if_else()"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><span style=\"color: #000000;\">Funkcja <a href=\"https:\/\/dplyr.tidyverse.org\/\" target=\"_blank\" rel=\"noopener\">dplyr<\/a> <strong>if_else()<\/strong> ma trzy zalety w por\u00f3wnaniu z podstawow\u0105 funkcj\u0105 <strong>ielse()<\/strong> w j\u0119zyku R:<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>1.<\/strong> Funkcja <strong>if_else()<\/strong> sprawdza, czy dwie alternatywy w instrukcji if else maj\u0105 ten sam typ danych.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>2.<\/strong> Funkcja <strong>if_else()<\/strong> nie konwertuje obiekt\u00f3w Date na numeryczne.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>3.<\/strong> Funkcja <strong>if_else()<\/strong> oferuje \u201ebrakuj\u0105cy\u201d argument okre\u015blaj\u0105cy spos\u00f3b obs\u0142ugi warto\u015bci NA.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Poni\u017csze przyk\u0142ady ilustruj\u0105 te r\u00f3\u017cnice w praktyce.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Przyk\u0142ad 1: if_else() sprawdza, czy dwie alternatywy maj\u0105 ten sam typ<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 danych w R, kt\u00f3ra zawiera informacje o r\u00f3\u017cnych koszykarzach:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (team=c('A', 'A', 'A', 'A', 'B', 'B', 'B', 'B'),\n                 points=c(22, 20, 28, 14, 13, 18, 27, 33))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  team points\n1 to 22\n2 to 20\n3 to 28\n4 to 14\n5 B 13\n6 B 18\n7 B 27\n8 B 33<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Je\u015bli u\u017cyjemy funkcji R base <strong>ifelse()<\/strong> do utworzenia nowej kolumny, kt\u00f3ra przypisze warto\u015b\u0107 \u201eAtlanta\u201d do wierszy o warto\u015bci zespo\u0142u \u201eA\u201d i 0 do wierszy o innej warto\u015bci, nie otrzymamy \u017cadnych b\u0142\u0119d\u00f3w. mimo \u017ce \u201eAtlanta\u201d jest znakiem, a 0 jest liczb\u0105:<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create new column based on values in team column\n<\/span>df$city &lt;- ifelse(df$team <span style=\"color: #800080;\">==<\/span> ' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">Atlanta<\/span> ', 0)\n\n<span style=\"color: #008080;\">#view updated data frame\n<\/span>df\n\n  team points city\n1 to 22 Atlanta\n2 to 20 Atlanta\n3 to 28 Atlanta\n4 A 14 Atlanta\n5 B 13 0\n6 B 18 0\n7 B 27 0\n8 B 33 0\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Je\u015bli jednak do wykonania tego samego zadania u\u017cyjemy funkcji <strong>if_else()<\/strong> programu dplyr, otrzymamy b\u0142\u0105d informuj\u0105cy nas, \u017ce w instrukcji if else u\u017cyli\u015bmy dw\u00f3ch r\u00f3\u017cnych typ\u00f3w danych:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#attempt to create new column based on values in team column\n<\/span>df$city &lt;- if_else(df$team <span style=\"color: #800080;\">==<\/span> ' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">Atlanta<\/span> ', 0)\n\nError: `false` must be a character vector, not a double vector.\n<\/strong><\/pre>\n<h2> <strong><span style=\"color: #000000;\">Przyk\u0142ad 2: if_else() nie konwertuje obiekt\u00f3w daty na warto\u015bci numeryczne<\/span><\/strong><\/h2>\n<p> <span style=\"color: #000000;\">Za\u0142\u00f3\u017cmy, \u017ce mamy w R nast\u0119puj\u0105c\u0105 ramk\u0119 danych, kt\u00f3ra pokazuje sprzeda\u017c dokonan\u0105 w sklepie w r\u00f3\u017cnych terminach:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (date=as. <span style=\"color: #3366ff;\">Date<\/span> (c('2022-01-05', '2022-01-17', '2022-01-22',\n                        '2022-01-23', '2022-01-29', '2022-02-13')),\n                 sales=c(22, 35, 24, 20, 16, 19))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n        dirty date\n1 2022-01-05 22\n2 2022-01-17 35\n3 2022-01-22 24\n4 2022-01-23 20\n5 2022-01-29 16\n6 2022-02-13 19\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Je\u015bli do modyfikacji warto\u015bci kolumny daty u\u017cyjemy funkcji R base <strong>ielse()<\/strong> to warto\u015bci zostan\u0105 automatycznie przekonwertowane na numeryczne:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#if date is before 2022-01-20 then add 5 days\n<\/span>df$date &lt;- ifelse(df$date &lt; ' <span style=\"color: #ff0000;\">2022-01-20<\/span> ', df$date+ <span style=\"color: #008000;\">5<\/span> , df$date)\n\n   dirty date\n1 19002 22\n2 19014 35\n3 19014 24\n4 19015 20\n5 19021 16\n6 19036 19\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Je\u015bli jednak u\u017cyjemy funkcji <strong>if_else()<\/strong> dplyr, obiekty daty pozostan\u0105 datami:<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#if date is before 2022-01-20 then add 5 days\n<\/span>df$date &lt;- ifelse(df$date &lt; ' <span style=\"color: #ff0000;\">2022-01-20<\/span> ', df$date+ <span style=\"color: #008000;\">5<\/span> , df$date)\n\n<span style=\"color: #008080;\">#view updated data frame<\/span>\ndf\n\n        dirty date\n1 2022-01-10 22\n2 2022-01-22 35\n3 2022-01-22 24\n4 2022-01-23 20\n5 2022-01-29 16\n6 2022-02-13 19\n<\/strong><\/pre>\n<h2> <strong><span style=\"color: #000000;\">Przyk\u0142ad 3: if_else() oferuje \u201ebrakuj\u0105cy\u201d argument okre\u015blaj\u0105cy spos\u00f3b obs\u0142ugi warto\u015bci NA<\/span><\/strong><\/h2>\n<p> <span style=\"color: #000000;\">Za\u0142\u00f3\u017cmy, \u017ce mamy nast\u0119puj\u0105c\u0105 ramk\u0119 danych w R:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (team=c('A', 'A', 'A', 'A', 'B', 'B', NA, 'B'),\n                 points=c(22, 20, 28, 14, 13, 18, 27, 33))\n\n<span style=\"color: #008080;\">#view data frame\n<\/span>df\n\n  team points\n1 to 22\n2 to 20\n3 to 28\n4 to 14\n5 B 13\n6 B 18\n7 &lt;NA&gt; 27\n8 B 33<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Je\u015bli u\u017cyjemy funkcji R base <strong>ifelse()<\/strong> do utworzenia nowej kolumny, nie ma domy\u015blnej opcji okre\u015blaj\u0105cej spos\u00f3b obs\u0142ugi warto\u015bci NA:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create new column based on values in team column\n<span style=\"color: #000000;\">df$city &lt;- ifelse(df$team <span style=\"color: #800080;\">==<\/span> ' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">Atlanta<\/span> ', ' <span style=\"color: #ff0000;\">Boston<\/span> ')\n\n<span style=\"color: #008080;\">#view updated data frame<\/span>\ndf\n\n  team points city\n1 to 22 Atlanta\n2 to 20 Atlanta\n3 to 28 Atlanta\n4 A 14 Atlanta\n5 B 13 Boston\n6 B 18 Boston\n7 &lt;NA&gt; 27 &lt;NA&gt;\n8 B 33 Boston\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Je\u015bli jednak u\u017cyjemy funkcji <strong>if_else()<\/strong> dplyr, mo\u017cemy u\u017cy\u0107 <strong>brakuj\u0105cego<\/strong> argumentu, aby okre\u015bli\u0107 spos\u00f3b obs\u0142ugi warto\u015bci NA:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008000;\">library<\/span> (dplyr)<\/span>\n\n#create new column based on values in team column\n<span style=\"color: #000000;\">df$city &lt;- ifelse(df$team <span style=\"color: #800080;\">==<\/span> ' <span style=\"color: #ff0000;\">A<\/span> ', ' <span style=\"color: #ff0000;\">Atlanta<\/span> ', ' <span style=\"color: #ff0000;\">Boston<\/span> ', missing=' <span style=\"color: #ff0000;\">other<\/span> ')\n\n<span style=\"color: #008080;\">#view updated data frame\n<\/span>df\n\n  team points city\n1 to 22 Atlanta\n2 to 20 Atlanta\n3 to 28 Atlanta\n4 A 14 Atlanta\n5 B 13 Boston\n6 B 18 Boston\n7 &lt;NA&gt; 27 other\n8 B 33 Boston\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Nale\u017cy pami\u0119ta\u0107, \u017ce wiersz z warto\u015bci\u0105 NA w kolumnie <strong>zesp\u00f3\u0142<\/strong> otrzymuje warto\u015b\u0107 \u201einne\u201d w <strong>kolumnie<\/strong> nowe miasto.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Dodatkowe zasoby<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">Poni\u017csze samouczki wyja\u015bniaj\u0105, jak wykonywa\u0107 inne typowe zadania w j\u0119zyku R:<\/span><\/p>\n<p> <a href=\"https:\/\/statorials.org\/pl\/r-if-instrukcja-zawiera-wiele-warunkow\/\" target=\"_blank\" rel=\"noopener\">Jak u\u017cywa\u0107 instrukcji If z wieloma warunkami w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/ifelse-w-r-zagniezdzony\/\" target=\"_blank\" rel=\"noopener\">Jak napisa\u0107 zagnie\u017cd\u017con\u0105 instrukcj\u0119 If Else w R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pl\/sprobuj-ponownie\/\" target=\"_blank\" rel=\"noopener\">Jak napisa\u0107 swoj\u0105 pierwsz\u0105 funkcj\u0119 tryCatch() w R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Funkcja dplyr if_else() ma trzy zalety w por\u00f3wnaniu z podstawow\u0105 funkcj\u0105 ielse() w j\u0119zyku R: 1. Funkcja if_else() sprawdza, czy dwie alternatywy w instrukcji if else maj\u0105 ten sam typ danych. 2. Funkcja if_else() nie konwertuje obiekt\u00f3w Date na numeryczne. 3. Funkcja if_else() oferuje \u201ebrakuj\u0105cy\u201d argument okre\u015blaj\u0105cy spos\u00f3b obs\u0142ugi warto\u015bci NA. Poni\u017csze przyk\u0142ady ilustruj\u0105 te [&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-3907","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>Odp.: R\u00f3\u017cnica mi\u0119dzy ifelse() i if_else() \u2013 Statologia<\/title>\n<meta name=\"description\" content=\"W tym samouczku wyja\u015bniono g\u0142\u00f3wne r\u00f3\u017cnice mi\u0119dzy funkcj\u0105 if_else() w dplyr i funkcj\u0105 ifelse() w podstawowym j\u0119zyku R.\" \/>\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\/r-if_else-vs-ifelse\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Odp.: R\u00f3\u017cnica mi\u0119dzy ifelse() i if_else() \u2013 Statologia\" \/>\n<meta property=\"og:description\" content=\"W tym samouczku wyja\u015bniono g\u0142\u00f3wne r\u00f3\u017cnice mi\u0119dzy funkcj\u0105 if_else() w dplyr i funkcj\u0105 ifelse() w podstawowym j\u0119zyku R.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-14T20:10:46+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=\"4 minuty\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/\",\"url\":\"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/\",\"name\":\"Odp.: R\u00f3\u017cnica mi\u0119dzy ifelse() i if_else() \u2013 Statologia\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pl\/#website\"},\"datePublished\":\"2023-07-14T20:10:46+00:00\",\"dateModified\":\"2023-07-14T20:10:46+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pl\/#\/schema\/person\/6484727a4612df3e69f016c3129c6965\"},\"description\":\"W tym samouczku wyja\u015bniono g\u0142\u00f3wne r\u00f3\u017cnice mi\u0119dzy funkcj\u0105 if_else() w dplyr i funkcj\u0105 ifelse() w podstawowym j\u0119zyku R.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/#breadcrumb\"},\"inLanguage\":\"pl-PL\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pl\/r-if_else-vs-ifelse\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Dom\",\"item\":\"https:\/\/statorials.org\/pl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Odp.: r\u00f3\u017cnica mi\u0119dzy ifelse() i if_else()\"}]},{\"@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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