AlgebraicKernel_d_2::ApproximateRelativeY

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AlgebraicKernel_d_2::ApproximateRelativeY_2

Definition

A model of AlgebraicKernel_d_2::ApproximateRelativeY_2 is an AdaptableBinaryFunction that computes an approximation of the y-coordinate of an AlgebraicKernel_d_2::Algebraic_real_2 value with respect to a given relative precision.

Refines

AdaptableBinaryFunction

Types

typedef std::pair<AlgebraicKernel_d_1::Bound, AlgebraicKernel_d_1::Bound>
	result_type;
typedef AlgebraicKernel_d_2::Algebraic_real_2
	first_argument_type;
typedef int	second_argument_type;

Operations

result_type

fo ( first_argument_type v , second_argument_type a )

The function computes a pair p of AlgebraicKernel_d_1::Bound, where p.first represents the lower approximation and p.second represents the upper approximation. The pair p approximates the y-coordinate y of the AlgebraicKernel_d_2::Algebraic_real_2 value v with respect to the relative precision a.

Postcondition:

p.first <= y

Postcondition:

y <= p.second

Postcondition:

(y - p.first) <= 2^-a |y|

Postcondition:

(p.second - y) <= 2^-a |y|