Positive Approximation and Interpolation Using Compactly Supported Radial Basis Functions

Table 1

Some of Wendland's CSRBF 𝜙_𝑠,𝑘∈𝑃𝐷_𝑠∩𝐶^2𝑘.

𝜙1,0=(1−𝑟)+,	𝑃𝐷1∩𝐶^0
𝜙3,0=(1−𝑟)^2+,	𝑃𝐷3∩𝐶^0
𝜙3,1=(1−𝑟)^4+(4𝑟+1),	𝑃𝐷3∩𝐶^2