- KroghInterpolator.derivative(x, der=1)#
Evaluate a single derivative of the polynomial at the point x.
Point or points at which to evaluate the derivatives
- derinteger, optional
Which derivative to evaluate (default: first derivative). This number includes the function value as 0th derivative.
Derivative interpolated at the x-points. Shape of d is determined by replacing the interpolation axis in the original array with the shape of x.
This may be computed by evaluating all derivatives up to the desired one (using self.derivatives()) and then discarding the rest.