Figure: The graph holds two B-spline curves. The dotted lines present the basis functions. The control points of the dashed curve (circles) are indicated by the crosses at y = {0,1,2,2,1,0} . The solid curve (squares) represents a least squares approximation of f(x) = 8x(1-x) + noise .
In this case the control points are indicated by plus signs at y = {-9E-4,1.61,2.38,2.42,1.60,-5E-3} with corresponding standard deviations { 9E-3, 0.03, 0.05 0.05, 0.03, 9E-3}.
Note that these standard deviations are small compared to the uniform spline case.

See also