“…In recent years these methods have received a strong interest emerging as valid computational alternatives in numerous problems, from different areas of science and engineering, that require the numerical solution of integral equations or PDEs with different boundary conditions [3,4,5,6,7]. Applications can be found in geodesy and mapping [8], geoscience [9], metereology [10], computer graphics [11], signal and image processing [12], computational finance [13,14], learning theory [15,16,17], biomathematics [18,19,20]. Many of these applications involve function approximation or need derivative estimation at any data location with any known data distribution in the problem domain.…”