We can see the difference between SVI and spline more clearly here. As expected, SVI curves show nice “smiles.” On the other hand, the spline follows the datapoints more closely but can go only as far ...
SIAM Journal on Numerical Analysis, Vol. 41, No. 2 (2004), pp. 589-604 (16 pages) We study the computation of the orthogonal spline collocation solution of a linear Dirichlet boundary value problem ...