This study introduces a procedure to obtain all
, subject to linear constraints on the function and its derivatives defined at specified values. The paper first shows how to express these interpolating functions passing through a single point in three distinct ways: linear, additive, and rational. Then, using the additive formalism, interpolating functions with linear constraints on one, two, and n
points are introduced as well as those satisfying relative constraints. In particular, for expressions passing through n
points, a generalization of the Waring’s interpolation form is introduced. An alternative approach to derive additive constraint interpolating expressions
is introduced requiring the inversion of a matrix with dimensions equally the number of constraints. Finally, continuous and discontinuous interpolating periodic functions passing through a set of points with specified periods are provided. This theory has already been applied to obtain least-squares solutions of initial and boundary value problems applied to nonhomogeneous linear differential equations with nonconstant coefficients.
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