Les conditions permettent d\u2019ex\u00e9cuter une commande en fonction d\u2019une ou plusieurs conditions. La forme la plus simple s\u2019\u00e9crit\u00a0:<\/p>\n
\u00a0<\/p>\n
\n if (condition){\n<\/p><\/blockquote>\n
+\u00a0\u00a0\u00a0 commande1<\/p>\n
+\u00a0\u00a0\u00a0 commande2<\/p>\n
+\u00a0\u00a0\u00a0 \u2026<\/p>\n
+}<\/p>\n
\u00a0<\/p>\n
Exemple\u00a0:<\/p>\n
\u00a0\n\nB<-TRUE\n\nx<-2\n\n\u00a0\n\nif (B==TRUE){\n\n\u00a0\u00a0\u00a0\u00a0 x<-x+1\n\n\u00a0\u00a0\u00a0\u00a0 y<-10\n\n}\n\n\u00a0\n\nx\n\n[1] 3\n\ny\n\n[1] 10\n\n<\/code><\/pre>\n\u00a0<\/p>\n
Dans ce cas l\u00e0 si B est diff\u00e9rent de TRUE rien n\u2019est effectu\u00e9. Pour ajouter une des commandes lorsque que la premi\u00e8re condition n\u2019est pas v\u00e9rifi\u00e9e on utilise else<\/b>\u00a0:<\/p>\n
\u00a0<\/p>\n
\n if (condition){\n<\/p><\/blockquote>\n
+\u00a0\u00a0\u00a0 commande1<\/p>\n
+\u00a0\u00a0\u00a0 commande2<\/p>\n
+\u00a0\u00a0\u00a0 \u2026<\/p>\n
} else (condition){<\/p>\n
+\u00a0\u00a0\u00a0 commande1<\/p>\n
+\u00a0\u00a0\u00a0 commande2<\/p>\n
+\u00a0\u00a0\u00a0 \u2026<\/p>\n
+}<\/p>\n
\u00a0<\/p>\n
Exemple\u00a0:<\/p>\n
\n\nB<-FALSE\n\nx<-2\n\n\u00a0\n\nif (B==TRUE){\n\n\u00a0\u00a0\u00a0\u00a0 x<-x+1\n\n\u00a0\u00a0\u00a0\u00a0 y<-10\n\n}else{\n\n\u00a0\u00a0\u00a0\u00a0 x<-x-1\n\n\u00a0\u00a0\u00a0\u00a0 y<-5\n\n}\n\n\u00a0\n\nx\n\n[1] 1\n\ny\n\n[1] 5\n\n<\/code><\/pre>\n\u00a0 \u00a0<\/p>\n
Dans ce cas-l\u00e0 il n\u2019y a qu\u2019une condition et son contraire. Si on d\u00e9sire ajouter une condition nous pouvons utiliser else if<\/b>\u00a0:<\/b><\/p>\n
\u00a0<\/b><\/p>\n
\n if (condition){\n<\/p><\/blockquote>\n
+\u00a0\u00a0\u00a0 commande1<\/p>\n
+\u00a0\u00a0\u00a0 commande2<\/p>\n
+\u00a0\u00a0\u00a0 \u2026<\/p>\n
} else if(condition){<\/p>\n
+\u00a0\u00a0\u00a0 commande1<\/p>\n
+\u00a0\u00a0\u00a0 commande2<\/p>\n
+\u00a0\u00a0\u00a0 \u2026<\/p>\n
+} else(condition){<\/p>\n
+\u00a0\u00a0\u00a0 commande1<\/p>\n
+\u00a0\u00a0\u00a0 commande2<\/p>\n
+\u00a0\u00a0\u00a0 \u2026<\/p>\n
+}<\/p>\n
\u00a0<\/p>\n
Exemple\u00a0:<\/p>\n
\n\nt<-7\n\nx<-2\n\n\u00a0\n\nif (t>10){\n\n\u00a0\u00a0\u00a0\u00a0 x<-x+2\n\n\u00a0\u00a0\u00a0\u00a0 y<-10\n\n} else if (5<=t & t<10){\n\n\u00a0\u00a0\u00a0\u00a0 x<-x+1\n\n\u00a0\u00a0\u00a0\u00a0 y<-5\n\n\u00a0}else {\n\n\u00a0\u00a0\u00a0\u00a0 x<-x-1\n\n\u00a0\u00a0\u00a0\u00a0 y<-3\n\n}\n\n\u00a0\n\nx\n\n[1] 3\n\ny\n\n[1] 5\n\n<\/code><\/pre>\n\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
Les conditions permettent d\u2019ex\u00e9cuter une commande en fonction d\u2019une ou plusieurs conditions. La forme la plus simple s\u2019\u00e9crit\u00a0: \u00a0 if (condition){ +\u00a0\u00a0\u00a0 commande1 +\u00a0\u00a0\u00a0 commande2 +\u00a0\u00a0\u00a0 \u2026 +} \u00a0 Exemple\u00a0: \u00a0 B<-TRUE x<-2 \u00a0 if (B==TRUE){ \u00a0\u00a0\u00a0\u00a0 x<-x+1 \u00a0\u00a0\u00a0\u00a0 y<-10 } \u00a0 x [1] 3 y [1] 10 \u00a0 Dans ce cas l\u00e0 si B est diff\u00e9rent de TRUE rien n\u2019est effectu\u00e9. Pour ajouter une des commandes lorsque que la premi\u00e8re condition n\u2019est pas v\u00e9rifi\u00e9e on utilise else\u00a0: \u00a0 if (condition){ +\u00a0\u00a0\u00a0 commande1 +\u00a0\u00a0\u00a0 commande2 +\u00a0\u00a0\u00a0 \u2026 } else (condition){ +\u00a0\u00a0\u00a0 commande1 +\u00a0\u00a0\u00a0 commande2 +\u00a0\u00a0\u00a0 \u2026 +} \u00a0 Exemple\u00a0: B<-FALSE x<-2 \u00a0 if (B==TRUE){ \u00a0\u00a0\u00a0\u00a0Read More →<\/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":[8,21],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-helene","4":"post-3198","6":"format-standard","7":"category-fonctions-utiles","8":"category-test"},"acf":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p9O7Sx-PA","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3198","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=3198"}],"version-history":[{"count":2,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3198\/revisions"}],"predecessor-version":[{"id":4297,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3198\/revisions\/4297"}],"wp:attachment":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/media?parent=3198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/categories?post=3198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/tags?post=3198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}