Positivity Preserving Interpolation Using Rational Bicubic Spline

Table 4

Positive surface data from function .

	−3	−2	−1	1	2	3
−3	1.536600	0.37930	0.055529	1.9445	1.62070	0.46344
−2	1.175100	0.19847	0.106150	1.8939	1.80150	0.82489
−1	0.044919	1.74900	0.589220	1.4108	0.25095	1.95510
1	0.107150	0.32885	0.640360	1.3596	1.67110	1.89290
2	0.605060	0.73262	0.865080	1.1349	1.26740	1.39490
3	0.851190	0.90059	0.950230	1.0498	1.09940	1.14880