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274 Éléments vides
Éléments vides
Lors de l'analyse de données réelles, il est possible que vous ne disposiez pas toujours
d'un jeu complet de données. TI-Nspire™CAS vous permet d'avoir des éléments de
données vides pour vous permettre de disposer de données presque complètes plutôt
que d'avoir à tout recommencer ou à supprimer les données incomplètes.
Vous trouverez un exemple de données impliquant des éléments vides dans le chapitre
Tableur et listes, sous «Représentation graphique des données de tableau ».
La fonction delVoid() vous permet de supprimer les éléments vides d'une liste, tandis
que la fonction isVoid() vous offre la possibilité de tester si un élément est vide. Pour
plus de détails, voir delVoid(), page 53 et isVoid(), page 102.
Remarque : Pour entrer un élément vide manuellement dans une expression, tapez «_
» ou le mot clé void. Le mot clé void est automatiquement converti en caractère «_
» lors du calcul de l'expression. Pour saisir le caractère «_ » sur la calculatrice,
appuyez sur / _.
Calculs impliquant des éléments vides
La plupart des calculs impliquant des
éléments vides génère des résultats vides.
Reportez-vous à la liste des cas spéciaux ci-
dessous.
Arguments de liste contenant des éléments vides
Les fonctions et commandes suivantes
ignorent (passent) les éléments vides
rencontrés dans les arguments de liste.
count, countIf, cumulativeSum,
freqTable4list, frequency, max, mean,
median, product, stDevPop, stDevSamp,
sum, sumIf, varPop et varSamp, ainsi que les
calculs de régression, OneVar, TwoVar et
les statistiques FiveNumSummary, les
intervalles de confiance et les tests
statistiques.
278


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