derivative(self, x, der=1)
This is computed by evaluating all derivatives up to the desired one (using self.derivatives()) and then discarding the rest.
Point or points at which to evaluate the derivatives
Which derivative to extract. 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.
Evaluate one derivative of the polynomial at the point x
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