/// <summary> /// Interpolate, differentiate and 2nd differentiate at point t. /// </summary> /// <param name="t">Point t to interpolate at.</param> /// <returns>Interpolated first derivative at point t.</returns> /// <seealso cref="IInterpolation.SupportsDifferentiation"/> /// <seealso cref="Differentiate(double)"/> public Tuple <double, double, double> DifferentiateAll(double t) { return(_spline.DifferentiateAll(t)); }