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Texas Instruments voyage 200 Manual

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Annexe A : Instructions et fonctions 977
variance() Menu MATH/Statistics variance()
variance(
liste1
[,
liste2
]) ⇒
⇒⇒
⇒
expression
Retourne la variance estimée d’une population
représentée par l’échantillon
liste1
,
éventuellement pondérés par les éléments de
liste2
. En l’absence de
liste2
, cette variance est
calculé par la formule :
vx
xx
n
i
i
n
()=
−
−
=
∑
a
f
2
1
1
liste1
doit avoir au moins deux éléments.
variance({a,b,c}) ¸
aabcbbcc
222
3
−⋅ + + −⋅+()
variance({1,2,5,ë 6,3,ë 2}) ¸
31
2
variance({1,3,5},{4,6,2}) ¸
68/33
variance(
matrice1
[,
matrice2
]) ⇒
⇒⇒
⇒
matrice
Retourne la matrice ligne formée par les
variances (au sens défini ci-dessus) des éléments
de chaque colonne de
matrice1
, éventuellement
pondérés par les éléments correspondants de
matrice2
.
matrice1
doit avoir au moins deux
lignes.
variance([1,2,5;ë 3,0,1;.5,.7,
3])
¸ [4,75 1.03 4]
variance([L1.1,2.2;3.4,5.1;
L2.3,4.3],[6,3;2,4;5,1]) ¸
[3.91731,2.08411]
when() Éditeur de programme : F2 (Control) ou CATALOG when()
when(
condition
,
ResultSiOui
,
ResultSiNon
,
[
ResultSiInconnu
]) ⇒
⇒⇒
⇒
expression
Retourne
ResultSiOui
,
ResultSiNon
ou
ResultSiInconnu
suivant que la condition est
vraie, fausse ou indéterminée.
Le dernier argument est optionnel. S'il est absent,
et que la condition est indéterminée, l'expression
est retournée sans être évaluée.
Cette fonction est utile pour la programmation de
fonctions définies par morceaux.
when(n>0, nù factoral(nì 1),1)
! factoral(n) ¸
factoral(6) ¸ 720
Graph when(x<0,x+3,5ì x^2) ¸
ClrGraph ¸
Graph when(x<0,when(x<ë p,
4ù sin(x),2x+3),5ì x^2) ¸
While Structure de contrôle. Voir chap. VII et chap. 34, manuel CD. While
“With” Voir |, page 991. “Sachant que”
… 976 …


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