Construction of dual BB-spline functions

Using new properties of dual functions, we show that the method of constructing the dual bases recently presented in [P. Woźny, Construction of dual bases, Journal of Computational and Applied Mathematics 245 (2013) 75–85] can be significantly simplified. Next, we propose a simple algorithm of constructing the dual BB-spline functions, which can be useful in solving some approximation problems related to numerical analysis or computer graphics.