IMSL C# Numerical Library

Spline2D.Derivative Method (Double, Double, Int32, Int32)

Returns the value of the partial derivative of the tensor-product spline at the point (x, y).

public virtual double Derivative(
   double x,
   double y,
   int xPartial,
   int yPartial
);

Parameters

x: A double scalar specifying the x-coordinate of the evaluation point for the tensor-product spline.
y: A double scalar specifying the y-coordinate of the evaluation point for the tensor-product spline.
xPartial: An int scalar specifying the x-partial derivative.
yPartial: An int scalar specifying the y-partial derivative.

Return Value

A double scalar containing the value of the partial derivative

$\frac{{\partial ^{i + j} s}}{{\partial ^i x\,\,\partial ^j y}}$

where i = xPartial and j = yPartial, at (x, y).

See Also

Spline2D Class | Imsl.Math Namespace | Spline2D.Derivative Overload List