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Blz. 3-37
commando DEF(f(x) = IFTE(x>0, x^2-1, 2*x-1)) om deze functie in de ALG-
modus weer te geven.
Druk vervolgens op `. Voer in de RPN-modus de functiedefinitie in tussen
aanhalingstekens: ‘f(x) = IFTE(x>0, x^2-1, 2*x-1)’
druk vervolgens op „à.
Druk op J om terug te keren naar het variabelenmenu. De functie @@f@@@ zou
dan beschikbaar moeten zijn in het softtoetsenmenu. Druk op @@@f@@@ om het
resulterende programma te bekijken:
<< x ‘IFTE(x>0, x^2-1, 2*x-1)’ >>
Om de functie te evalueren in de ALG-modus moet u de benaming van de
functie, f, in te voeren, gevolgd door het getal waarmee u de functie wilt
evalueren, bijv. f(2), vervolgens drukt u op `. In de RPN-modus voert u een
getal in en drukt u vervolgens op @@f@@. Ga bijvoorbeeld het volgende na f(2) =
3, terwijl f(-2) = -5.
Gecombineerde IFTE functies
Om een complexere functie te programmeren, zoals
kunt u verschillende niveaus van de functie IFTE combineren, bijv.
g(x) = IFTE(x<-2, -x, IFTE(x<0, x+1, IFTE(x<2, x-1, x^2)))’,
Definieer deze functie met behulp van de bovenvermelde gegevens en
controleer of g(-3) = 3, g(-1) = 0, g(1) = 0, g(3) = 9.
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167


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