Module DBS2GD in IMSLMEvaluate the derivative of a two-dimensional tensor-product spline, given its tensor-product B-spline representation on a grid.
CALL DBS2GD (IXDER, IYDER, NX, XVEC, NY, YVEC, KXORD, KYORD, XKNOT, YKNOT, NXCOEF, NYCOEF, BSCOEF, VALUE, LDVALU)| E3a1 | Evaluation of fitted functions |
| E3a2 | Evaluation of derivatives of fitted functions |