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get_var_bounds(?Var, -Lower, -Upper)

Retrieve bounds of a numeric variable in a generic way
Var
Variable or number.
Lower
Float or variable.
Upper
Float or variable.

Description

This predicate is intended to be used on attributed variables that have a numeric domain. The bound information is collected from the variable's attributes via their get_bounds-handlers. If several attributes contain bound information, the results are intersected to produce the tightest bound information available. An empty bound (Lower > Upper) can be returned.

The bounds are always returned as floating point numbers, regardless of any integrality constraint on the variable.

Modes and Determinism

Exceptions

(5) type error
Var is not a variable or number

Examples

    [eclipse 1]: lib(fd), lib(ic).
    yes.

    [eclipse 2]: ic:(X::3.0..9.0), fd:(X::1..7), get_var_bounds(X,L,U).
    X = X{ic : 3.0..9.0, fd:[1..7]}
    L = 3.0
    U = 7.0
    Yes (0.00s cpu)

    [eclipse 3]: get_var_bounds(X,L,U).
    X = X
    L = -1.0Inf
    U = 1.0Inf
    yes.

    [eclipse 4]: get_var_bounds(5,L,U).
    L = 5.0
    U = 5.0
    yes.

    [eclipse 5]: get_var_bounds(a,L,U).
    type error in get_var_bounds(a, L, U)

See Also

set_var_bounds / 3