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Bspline_eval_derivs – The evaluation of s(t,z) and the derivative with respect to t and z from its normalized B-spline representation. This function is an optimized version of the function BsplineAlgo_c_derivs.
#include <BsplineEval/bsplineval.h>
#include <BsplineEval/spline_coef.h>
BsplineErr Bspline_eval_derivs(
double theta,
double z,
BsplineInput *bspline_input,
BsplineResult *bspline_result
);
double theta- The theta to evaluate the B-spline
double z- The value of z to evaluate the B-spline
BsplineInput *bspline_input- All B-spline input
BsplineResult *bspline_result- All B-spline output
An optimized implementation of the function BsplineAlgo_c. This function can be further optimized by folding in the last of the seperate call to BsplineAlgo_b, but this requires the rewriting of the algo_b routine. The Numerical Evaluation of a Spline from its B-Spline Representation by M. G. Cox. J. Inst. Maths. Applics (1978) 21, 135-143.
The enum BsplineErr.
Possible values for a
BsplineErr are as follows:
Bspline_Success- Success
Bspline_OutOfRange- One of the arguments is out of range
Bspline_OutOfRangeT- The theta value is not within the limits of the t_knots
Bspline_OutOfRangeZ- The z value is outside the limits of the z_knots
Bspline_WrongMethod1- The method request must be one of : a, A, b or B
Bspline_WrongMethod2- The method request must be one of : a, A, b or B