{"id":4503,"date":"2023-07-10T14:25:59","date_gmt":"2023-07-10T14:25:59","guid":{"rendered":"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/"},"modified":"2023-07-10T14:25:59","modified_gmt":"2023-07-10T14:25:59","slug":"r-lijst-bestanden-op-datum","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/","title":{"rendered":"Bestanden op datum weergeven in r (met voorbeeld)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">U kunt de volgende basissyntaxis gebruiken om bestanden in de huidige werkmap in R op datum weer te geven:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#extract all CSV files in working directory\n<\/span>file_info = file. <span style=\"color: #3366ff;\">info<\/span> ( <span style=\"color: #3366ff;\">list.files<\/span> (pattern=\" <span style=\"color: #ff0000;\">*.csv<\/span> \"))\n\n<span style=\"color: #008080;\">#sort files based on mtime (date and time modification)\n<\/span>file_info = file_info[ <span style=\"color: #008000;\">with<\/span> (file_info, <span style=\"color: #008000;\">order<\/span> (as. <span style=\"color: #3366ff;\">POSIXct<\/span> (mtime))), ]\n\n<span style=\"color: #008080;\">#view only file names with modification date and time\n<\/span>file_info[c(\" <span style=\"color: #ff0000;\">mtime<\/span> \")]\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Het volgende voorbeeld laat zien hoe u deze syntaxis in de praktijk kunt gebruiken.<\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Voorbeeld: bestanden op datum weergeven in R<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Stel dat ik alle CSV-bestanden in de <a href=\"https:\/\/statorials.org\/nl\/setwd-getwd-in-r\/\" target=\"_blank\" rel=\"noopener\">huidige werkmap<\/a> in R wil weergeven op datum.<\/span><\/span><\/p>\n<p> <span style=\"color: #000000;\">Ik kan de volgende syntaxis gebruiken om eerst alle CSV-bestanden (met bestandsinformatie) uit de huidige werkmap te extraheren:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#extract all CSV files in working directory\n<\/span>file_info = file. <span style=\"color: #3366ff;\">info<\/span> ( <span style=\"color: #3366ff;\">list.files<\/span> (pattern=\" <span style=\"color: #ff0000;\">*.csv<\/span> \"))\n\n<span style=\"color: #008080;\">#view all CSV files<\/span>\nfile_info\n\n                        size isdir mode mtime ctime atime exe\nbasketball_data.csv 55 FALSE 666 2023-01-06 11:07:43 2022-07-12 09:07:26 2023-04-18 09:42:19 no\ndf1.csv 126 FALSE 666 2022-04-21 10:48:24 2022-04-21 10:48:24 2023-04-18 09:42:19 no\ndf2.csv 126 FALSE 666 2022-04-21 10:48:30 2022-04-21 10:48:29 2023-04-18 09:42:19 no\ndf3.csv 126 FALSE 666 2022-04-21 10:48:34 2022-04-21 10:48:34 2023-04-18 09:42:19 no\nmy_data.csv 53 FALSE 666 2022-09-09 09:02:21 2022-04-22 09:00:13 2023-04-18 09:42:19 no\nmy_list.csv 90 FALSE 666 2022-04-21 09:40:01 2022-04-21 09:39:59 2023-04-18 09:42:19 no\nmy_test.csv 146 FALSE 666 2022-04-21 09:42:25 2022-04-21 09:42:25 2023-04-18 09:42:19 no\nplayer_stats.csv 137 FALSE 666 2023-04-11 09:07:20 2023-04-11 09:07:20 2023-04-18 09:42:19 no\nplayers_data.csv 50 FALSE 666 2023-01-06 09:44:12 2023-01-06 09:44:12 2023-04-18 09:42:19 no\nteam_info.csv 131 FALSE 666 2023-04-11 09:07:21 2023-04-11 09:07:21 2023-04-18 09:42:19 no\ntest.csv 18059168 FALSE 666 2022-09-07 09:07:34 2020-02-01 13:44:03 2023-04-18 09:42:19 no\nuneven_data.csv 43 FALSE 666 2023-01-06 14:02:17 2023-01-06 14:00:27 2023-04-18 09:42:19 no\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Ik kan dan de functie <strong>order()<\/strong> gebruiken om de bestanden te ordenen op <strong>mtime<\/strong> , wat de datum en tijd vertegenwoordigt waarop de bestanden voor het laatst zijn gewijzigd:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#sort files based on mtime (date and time modification)\n<\/span>file_info = file_info[ <span style=\"color: #008000;\">with<\/span> (file_info, <span style=\"color: #008000;\">order<\/span> (as. <span style=\"color: #3366ff;\">POSIXct<\/span> (mtime))), ]\n\n<span style=\"color: #008080;\">#view sorted files<\/span>\nfile_info\n\n                        size isdir mode mtime ctime atime exe\nmy_list.csv 90 FALSE 666 2022-04-21 09:40:01 2022-04-21 09:39:59 2023-04-18 09:42:19 no\nmy_test.csv 146 FALSE 666 2022-04-21 09:42:25 2022-04-21 09:42:25 2023-04-18 09:42:19 no\ndf1.csv 126 FALSE 666 2022-04-21 10:48:24 2022-04-21 10:48:24 2023-04-18 09:42:19 no\ndf2.csv 126 FALSE 666 2022-04-21 10:48:30 2022-04-21 10:48:29 2023-04-18 09:42:19 no\ndf3.csv 126 FALSE 666 2022-04-21 10:48:34 2022-04-21 10:48:34 2023-04-18 09:42:19 no\ntest.csv 18059168 FALSE 666 2022-09-07 09:07:34 2020-02-01 13:44:03 2023-04-18 09:42:19 no\nmy_data.csv 53 FALSE 666 2022-09-09 09:02:21 2022-04-22 09:00:13 2023-04-18 09:42:19 no\nplayers_data.csv 50 FALSE 666 2023-01-06 09:44:12 2023-01-06 09:44:12 2023-04-18 09:42:19 no\nbasketball_data.csv 55 FALSE 666 2023-01-06 11:07:43 2022-07-12 09:07:26 2023-04-18 09:42:19 no\nuneven_data.csv 43 FALSE 666 2023-01-06 14:02:17 2023-01-06 14:00:27 2023-04-18 09:42:19 no\nplayer_stats.csv 137 FALSE 666 2023-04-11 09:07:20 2023-04-11 09:07:20 2023-04-18 09:42:19 no\nteam_info.csv 131 FALSE 666 2023-04-11 09:07:21 2023-04-11 09:07:21 2023-04-18 09:42:19 no\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Merk op dat u in plaats daarvan <strong>ctime<\/strong> kunt gebruiken als u bestanden wilt sorteren op <em>aanmaakdatum<\/em> , of <strong>atime<\/strong> om bestanden te sorteren op <em>toegangsdatum<\/em> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ten slotte kunnen we het dataframe onderverdelen zodat alleen de bestandsnamen worden weergegeven, evenals de datum en tijd waarop deze voor het laatst zijn gewijzigd:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#view only file names with modification date and time\n<\/span>file_info[c(\" <span style=\"color: #ff0000;\">mtime<\/span> \")]\n\n                                  mtime\nmy_list.csv 2022-04-21 09:40:01\nmy_test.csv 2022-04-21 09:42:25\ndf1.csv 2022-04-21 10:48:24\ndf2.csv 2022-04-21 10:48:30\ndf3.csv 2022-04-21 10:48:34\ntest.csv 2022-09-07 09:07:34\nmy_data.csv 2022-09-09 09:02:21\nplayers_data.csv 2023-01-06 09:44:12\nbasketball_data.csv 2023-01-06 11:07:43\nuneven_data.csv 2023-01-06 14:02:17\nplayer_stats.csv 2023-04-11 09:07:20\nteam_info.csv 2023-04-11 09:07:21\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Als u wilt, kunt u ook alleen bestandsnamen op datum weergeven:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#view only file names\n<\/span>rownames(file_info)\n\n [1] \"my_list.csv\" \"my_test.csv\" \"df1.csv\" \"df2.csv\" \"df3.csv\"            \n [6] \"test.csv\" \"my_data.csv\" \"players_data.csv\" \"basketball_data.csv\" \"uneven_data.csv\"    \n[11] \"player_stats.csv\" \"team_info.csv\"  \n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">De twaalf CSV-bestandsnamen zijn gerangschikt op datum.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Gerelateerd:<\/strong> <a href=\"https:\/\/statorials.org\/nl\/r-bestandenlijst\/\" target=\"_blank\" rel=\"noopener\">Hoe de list.files()-functie in R te gebruiken (4 voorbeelden)<\/a><\/span><\/p>\n<h2> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h2>\n<p> <span style=\"color: #000000;\">In de volgende tutorials wordt uitgelegd hoe u andere veelvoorkomende taken in R kunt uitvoeren:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><a href=\"https:\/\/statorials.org\/nl\/lees-zip-bestand-in-r\/\" target=\"_blank\" rel=\"noopener\">Zip-bestanden lezen in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/csv-importeren-in-r\/\" target=\"_blank\" rel=\"noopener\">CSV-bestanden importeren in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/excel-importeren-in-r\/\" target=\"_blank\" rel=\"noopener\">Excel-bestanden importeren in R<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U kunt de volgende basissyntaxis gebruiken om bestanden in de huidige werkmap in R op datum weer te geven: #extract all CSV files in working directory file_info = file. info ( list.files (pattern=&#8220; *.csv &#8222;)) #sort files based on mtime (date and time modification) file_info = file_info[ with (file_info, order (as. POSIXct (mtime))), ] #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":[11],"tags":[],"class_list":["post-4503","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Bestanden op datum weergeven in R (met voorbeeld) \u2013 Statorials<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u bestanden op datum kunt weergeven in R, met een voorbeeld.\" \/>\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\/nl\/r-lijst-bestanden-op-datum\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bestanden op datum weergeven in R (met voorbeeld) \u2013 Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u bestanden op datum kunt weergeven in R, met een voorbeeld.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-10T14:25:59+00:00\" \/>\n<meta name=\"author\" content=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"3\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/\",\"url\":\"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/\",\"name\":\"Bestanden op datum weergeven in R (met voorbeeld) \u2013 Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-10T14:25:59+00:00\",\"dateModified\":\"2023-07-10T14:25:59+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u bestanden op datum kunt weergeven in R, met een voorbeeld.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/r-lijst-bestanden-op-datum\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Bestanden op datum weergeven in r (met voorbeeld)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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