lpspline.constraints.concavity.Concave

class lpspline.constraints.concavity.Concave(start: float | None = None, end: float | None = None)

Bases: Constraint

Concavity constraint enforcing a negative second derivative globally or locally.

build_constraint(s) → list

Constructs the appropriate CVXPY concave formulations according to the basis type.

Parameters:

s (Spline) – The parent Spline applying this restriction.

Returns:

A sequence containing formulation rules as CVXPY boolean expressions.

Return type:

list

Raises:

NotImplementedError – If the supplied Spline instance functionally lacks concavity restrictions.