Ascend FD-23R Manual de usuario descargar pdf (Pagina 27)

1.4. FD Constraints 15

TOY(FD)> L == [X,1,2], domain [X] 1 2, count 1 L (#=) 2

yes

L == [ 1, 1, 2 ]

X == 1

Elapsed time: 0 ms.

exactly/3

• Type declaration:

exactly :: int → [int] → int → bool

• Deﬁnition: ’exactly X L N’ is true if X occurs exactly N times in the list L.

• Example at the TOY(FD) command level:

Next goal imposes that the two elements of a list have to be equal to 2.

TOY(FD)> L == [X,Y], domain L 1 2, exactly 2 L 2

yes

L == [ 2, 2 ]

X == 2

Y == 2

Elapsed time: 0 ms.

element/3

• Type declaration:

element :: int → [int] → int → bool

• Deﬁnition: ’element X L Y’ is true if the X-th element in the list L is Y (in the

sense of FD).

• Example at the TOY(FD) command level:

TOY> L == [X,Y,Z], domain L 1 10, element 2 L 7

yes

L == [ X, 7, Z ]

Y == 7

Z in 1..10

X in 1..10

Elapsed time: 0 ms.

serialized/2

serialized’/3

cumulative/4

cumulative/5

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 80 81

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Ascend FD-23R Manual de usuario Pagina 27