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Conceptual Figure to illustrate the use of B‐splines to construct nonlinear functions. In the left panel, five B‐spline vectors are shown, which map values of an input variable (on the x‐axis) to a value on the y‐axis. The middle panel shows the same B‐spline vectors, but weighted (multiplied) by real numbers, with the weights illustrated as annotations. These weighted B‐spline vectors are summed to produce the values of a nonlinear function (right panel).
