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QR
Catalogue >
5EL14 ·max(dim(Matrice)) ·rowNorm
(Matrice)
La factorisation QR sous forme numérique
est calculée en utilisant la transformation
de Householder. La factorisation
symbolique est calculée en utilisant la
méthode de Gram-Schmidt. Les colonnes
de NomMatq sont les vecteurs de base
orthonormaux de l'espace vectoriel
engend par les vecteurs colonnes de
matrice.
QuadReg
Catalogue >
QuadReg X,Y [, Fréq] [, Catégorie,
Inclure]]
Effectue l'ajustement polynomial de degré 2
y = a·x
2
+b·x+csur les listes X et Y en
utilisant la fréquence Fréq. Un récapitulatif
du résultat est stocké dans la variable
stat.results. (Voir page 192.)
Toutes les listes doivent comporter le même
nombre de lignes, à l'exception de Inclure.
X et Y sont des listes de variables
indépendantes et dépendantes.
Fréq est une liste facultative de valeurs qui
indiquent la fréquence. Chaque élément
dans Fréq correspond à une fréquence
d'occurrence pour chaque couple X et Y. Par
défaut, cette valeur est égale à 1. Tous les
éléments doivent être des entiers | 0.
Catégorie est une liste de codes de
catégories pour les couples X et Y
correspondants..
Inclure est une liste d'un ou plusieurs codes
de catégories. Seuls les éléments dont le
code de catégorie figure dans cette liste
sont inclus dans le calcul.
156


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