{"id":300,"date":"2014-10-11T12:32:41","date_gmt":"2014-10-11T10:32:41","guid":{"rendered":"http:\/\/wordpress.callac.online\/index.php\/presentation-de-la-fonction-sample-de-r\/"},"modified":"2023-10-14T20:14:27","modified_gmt":"2023-10-14T18:14:27","slug":"presentation-de-la-fonction-sample-de-r","status":"publish","type":"page","link":"https:\/\/wordpress.callac.online\/index.php\/logiciels-mathematiques\/le-logiciel-r\/les-tirages-avec-r\/presentation-de-la-fonction-sample-de-r\/","title":{"rendered":"Pr\u00e9sentation de la fonction sample de R"},"content":{"rendered":"

Avant de faire un tirage dans une liste, il nous faut cr\u00e9er cette liste.<\/p>\n

Cr\u00e9ation de listes<\/h2>\n

Voici quelques exemples.<\/p>\n

Pour des nombres entiers cons\u00e9cutifs :<\/p>\n

liste1<-1:10 \nliste1<\/pre>\n

\n[1]  1  2  3  4  5  6  7  8  9 10
\n<\/code><\/p>\n
liste2<-seq(0,24,4) \nliste2<\/pre>\n

\n[1]  0  4  8 12 16 20 24
\n<\/code><\/p>\n
Pour des listes de lettres cons\u00e9cutives :<\/p>\n
liste3<-LETTERS[1:26] \nliste3<\/pre>\n

\n[1] \"A\" \"B\" \"C\" \"D\" \"E\" \"F\" \"G\" \"H\" \"I\" \"J\" \"K\" \"L\" \"M\" \"N\" \"O\" \"P\" \"Q\" \"R\" \"S\" \"T\" \"U\" \"V\"
\n[23] \"W\" \"X\" \"Y\" \"Z\"
\n<\/code><\/p>\n
liste4<-letters[3:10] \nliste4<\/pre>\n

\n[1] \"c\" \"d\" \"e\" \"f\" \"g\" \"h\" \"i\" \"j\"
\n<\/code><\/p>\n
Pour une liste quelconques d’\u00e9l\u00e9ments donn\u00e9s :<\/p>\n
liste6<-c(5,7,3) \nliste6<\/pre>\n

\n[1] 5 7 3
\n<\/code><\/p>\n
\n
Travaillons sur la liste suivante :<\/p>\n
liste<-1:10 \nliste<\/pre>\n

\n[1]  1  2  3  4  5  6  7  8  9 10
\n<\/code><\/p>\n
Obtenir une permutation<\/h2>\n
sample(liste)<\/pre>\n

\n[1] 10  2  5  6  4  7  8  1  9  3
\n<\/code><\/p>\n
Obtenir un tirage successifs sans remise<\/h2>\n
C’est le comportement par d\u00e9faut de la fonction sample)<\/em><\/p>\n
sample(liste,3)<\/pre>\n

\n[1]  5 10  8
\n<\/code><\/p>\n
Comme il s’agit d’un tirage sans remise, on ne peut pas acc\u00e9der la taille de la liste :<\/p>\n
sample(liste,20)<\/pre>\n

\nErreur dans sample.int(length(x), size, replace, prob) :
\nimpossible de prendre un \u00e9chantillon plus grand que la population lorsque 'replace = FALSE'
\n<\/code><\/p>\n
Tirage successif avec remise<\/h2>\n
sample(liste,20,replace=TRUE)<\/pre>\n

\n[1]  2  1  5  1  6  5  4  6  7 10  9  4  1  4  7  6  3  4 10  3
\n<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"
Avant de faire un tirage dans une liste, il nous faut cr\u00e9er cette liste. Cr\u00e9ation de listes Voici quelques exemples. Pour des nombres entiers cons\u00e9cutifs : liste1<-1:10 liste1 [1] 1…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2085,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-300","page","type-page","status-publish","hentry"],"yoast_head":"\nPr\u00e9sentation de la fonction sample de R - Maths & Num\u00e9rique<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wordpress.callac.online\/index.php\/logiciels-mathematiques\/le-logiciel-r\/les-tirages-avec-r\/presentation-de-la-fonction-sample-de-r\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pr\u00e9sentation de la fonction sample de R - Maths & Num\u00e9rique\" \/>\n<meta property=\"og:description\" content=\"Avant de faire un tirage dans une liste, il nous faut cr\u00e9er cette liste. 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