Module DBS2IG in IMSLMEvaluate the integral of a tensor-product spline on a rectangular domain, given its tensor-product B-spline representation.
R = DBS2IG(A, B, C, D, KXORD, KYORD, XKNOT, YKNOT, NXCOEF, NYCOEF, BSCOEF)| E3a3 | Quadrature involving fitted functions |
| H2b1b2 | Nonautomatic n-D quadrature on one or more hyper-rectangular regions, integrand available only on a grid |