{"id":3089,"date":"2015-07-09T08:17:40","date_gmt":"2015-07-09T07:17:40","guid":{"rendered":"https:\/\/abcdr.guyader.pro\/?p=3089"},"modified":"2018-04-08T00:01:50","modified_gmt":"2018-04-07T23:01:50","slug":"comment-passer-dun-format-wide-a-un-format-long-pour-un-data-frame-melt","status":"publish","type":"post","link":"https:\/\/thinkr.fr\/abcdr\/comment-passer-dun-format-wide-a-un-format-long-pour-un-data-frame-melt\/","title":{"rendered":"Comment passer d\u2019un format Wide \u00e0 un format Long pour un data.frame ? : melt"},"content":{"rendered":"<p>La fonction <b>melt(), <\/b>qui fait partie du package <b>reshape2<\/b>, permet de modifier le format des donn\u00e9es en fonction d\u2019une ou plusieurs variables de r\u00e9f\u00e9rence (id). Ces variables correspondent en g\u00e9n\u00e9ral aux variables qualitatives du data.frame.<\/p>\n<pre><code><br \/>library(reshape2) # On charge le package reshape2\n\nairquality\n\naqm &lt;- melt(airquality, id=c(\"Month\", \"Day\"), na.rm=TRUE) \u00a0<br \/> aqm\u00a0 <br \/> <\/code><\/pre>\n<p>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La fonction melt(), qui fait partie du package reshape2, permet de modifier le format des donn\u00e9es en fonction d\u2019une ou plusieurs variables de r\u00e9f\u00e9rence (id). Ces variables correspondent en g\u00e9n\u00e9ral aux variables qualitatives du data.frame. library(reshape2) # On charge le package reshape2 airquality aqm &lt;- melt(airquality, id=c(\u00ab\u00a0Month\u00a0\u00bb, \u00ab\u00a0Day\u00a0\u00bb), na.rm=TRUE) \u00a0 aqm\u00a0 \u00a0<a class=\"more-link\" href=\"https:\/\/thinkr.fr\/abcdr\/comment-passer-dun-format-wide-a-un-format-long-pour-un-data-frame-melt\/\">Read More &rarr;<\/a><\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"twitter_399453572_399453572":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8,23],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-helene","4":"post-3089","6":"format-standard","7":"category-fonctions-utiles","8":"category-transformation-de-donnees"},"acf":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p9O7Sx-NP","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3089","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/comments?post=3089"}],"version-history":[{"count":2,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3089\/revisions"}],"predecessor-version":[{"id":4267,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3089\/revisions\/4267"}],"wp:attachment":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/media?parent=3089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/categories?post=3089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/tags?post=3089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}