Evaluate the derivative of a two-dimensional tensor-product spline, given its tensor-product B-spline representation on a grid. Classes : E3a1 . Evaluation of fitted functions E3a2 . Evaluation of derivatives of fitted functions Type : Fortran subroutine in IMSLM library. Access : Proprietary. Many implementations available. Precision: Single. Usage : CALL BS2GD (IXDER, IYDER, NX, XVEC, NY, YVEC, KXORD, KYORD, XKNOT, YKNOT, NXCOEF, NYCOEF, BSCOEF, VALUE, LDVALU) Details : Documentation Example Sites : (1) ITL
ITL: Unix Workstation Network, National Institute of Standards and Technology (NIST), Gaithersburg, MD. Available to NIST staff. Precision: Single. (Double: DBS2GD) Access available only to NIST staff on internal Unix systems. They may access this package provided the /itl tree is cross-mounted. Link : Login to spruce.nist.gov and see ITL How-To for information on how to setup your environment and link. Documentation: cat /home/fetch/Subjects/Math-Stat-Software/imsl/Documentation/bs2gd Example : cat /home/fetch/Subjects/Math-Stat-Software/imsl/Examples/bs2gd
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