{"id":474,"date":"2011-11-05T20:36:34","date_gmt":"2011-11-05T19:36:34","guid":{"rendered":"https:\/\/abcdr.guyader.pro\/?p=474"},"modified":"2018-04-07T23:58:55","modified_gmt":"2018-04-07T22:58:55","slug":"comment-faire-une-boucle-for-avec-r","status":"publish","type":"post","link":"https:\/\/thinkr.fr\/abcdr\/comment-faire-une-boucle-for-avec-r\/","title":{"rendered":"Comment faire une boucle for avec R ?"},"content":{"rendered":"<pre><code>for ( i in 1:10) { <br \/>\nprint(i) <br \/>\n}<\/code><\/pre>\n<p>\nCette commande peut se traduire par :<\/p>\n<pre><code>Pour (i allant de 1 \u00e0 10) <br \/>\n{ affiche i}<\/code><\/pre>\n<p>\nIl faut noter que les parenth\u00e8ses <strong>()<\/strong> servent \u00e0 d\u00e9finir la variable et les valeurs qu&rsquo;elle va prendre successivement \u00e0 chaque tour de boucle. Les accolades <strong>{}<\/strong> servent \u00e0 d\u00e9limiter les actions \u00e0 effectuer pour chacune des valeurs prises par la variable.<\/p>\n<p>IMPORTANT : R n&rsquo;aime pas vraiment les boucles <strong>for<\/strong>, il est beaucoup plus efficace d&rsquo;utiliser <strong>apply<\/strong>. Tout particuli\u00e8rement pour les tr\u00e8s grandes et longues boucles, <strong>apply<\/strong> fait cela en une fraction de seconde&#8230; alors que <strong>for<\/strong> peut mettre plusieurs minutes, ou ne pas r\u00e9ussir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>for ( i in 1:10) { print(i) } Cette commande peut se traduire par : Pour (i allant de 1 \u00e0 10) { affiche i} Il faut noter que les parenth\u00e8ses () servent \u00e0 d\u00e9finir la variable et les valeurs qu&rsquo;elle va prendre successivement \u00e0 chaque tour de boucle. Les accolades {} servent \u00e0 d\u00e9limiter les actions \u00e0 effectuer pour chacune des valeurs prises par la variable. IMPORTANT : R n&rsquo;aime pas vraiment les boucles for, il est beaucoup plus efficace d&rsquo;utiliser apply. Tout particuli\u00e8rement pour les tr\u00e8s grandes et longues boucles, apply fait cela en une fraction de seconde&#8230; alors que for peut mettre<a class=\"more-link\" href=\"https:\/\/thinkr.fr\/abcdr\/comment-faire-une-boucle-for-avec-r\/\">Read More &rarr;<\/a><\/p>\n","protected":false},"author":2,"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":[2,4],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-vincent","4":"post-474","6":"format-standard","7":"category-algorithmique","8":"category-base-indispensable"},"acf":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p9O7Sx-7E","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/474","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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/comments?post=474"}],"version-history":[{"count":2,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/474\/revisions"}],"predecessor-version":[{"id":4078,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/474\/revisions\/4078"}],"wp:attachment":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/media?parent=474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/categories?post=474"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/tags?post=474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}