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Instructions et fonctions A–97
39FRAPPA.DOC Instructions et fonctions Philippe Fortin Revised: 07/28/99 8:10 PM Printed: 08/05/99 12:58 PM Page A–97 of 100
Π
()
Menu MATH/Calculus
Π
()
Π
(
expression1
,
var
,
début
,
fin
)
&
expression
Evalue
expression1
pour chaque valeur
var
comprise entre
début
et
fin
, et retourne le
produit des résultats obtenus.
Π
(1/n,n,1,5)
¸
1
120
Π
({1/n,n,2},n,1,5)
¸
1
120
120 32
R
S
T
U
V
W
G
()
Menu MATH/Calculus TI
-
92 Plus : touches
2>
G
()
G
(
expression1
,
var
,
début
,
fin
)
&
expression
Evalue
expression1
pour chaque valeur
var
comprise entre
début
et
fin
, et retourne la
somme des résultats obtenus.
G
(1/n^2,n,1,5)
¸
5269
3600
G
(1/n^2,n,1,
ˆ
)
¸
π
2
6
#
(indirection)
Menu CHAR/Punctuation TI
-
92 Plus : touches
2
T
#
(indirection)
#
Chaîne
Ce symbole permet d'utiliser le contenu d'une
chaîne de caractères comme s'il s'agissait
d'un nom de variable, de fonction,
d'instruction ou de dossier.
On peut en particulier utiliser cette
possibilité pour créer ou modifier des
variables dont le nom est construit par un
programme.
La valeur de
Chaîne
doit être un nom de
variable valide.
Chaîne
peut être le nom d'une variable
contenant une chaîne de caractères, ou une
expression permettant de construire un
chaîne de caractères.
Dans ce cas, l'expression est placée entre
parenthèses, comme dans l'exemple ci-
contre.
Extraits de programme :
©
Request
“Entrez
votre
nom”,str1
NewFold
#str1
©
©
For
I,1,5,1
ClrGraph
Graph
i*x
StoPic
#(“Pic”
&
string(i))
EndFor
©
ô
(radian)
Menu MATH/Angle
ô
(radian)
expression1
ô
&
expression
liste1
ô
&
liste
matrice1
ô
&
matrice
En mode
DEGREE
, multiplie
expression
par
180/
p
. En mode
RADIAN
, retourne
expression
sans modification.
Cette fonction permet d'utiliser un angle
exprimé en radians alors que la machine est
en mode
DEGREE
. (Fonctions
trigonométriques et conversion
polaire/rectangulaire.)
En mode
DEGREE
ou
RADIAN :
cos((
p
/4)
ô
)
¸
2
2
587


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