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# scipy.interpolate.KroghInterpolator.derivatives

`KroghInterpolator.``derivatives`(x, der=None)

  Evaluate many derivatives of the polynomial at the point x

  Produce an array of all derivative values at the point x.

  Parameters : | x : scalar or array-like of length N Point or points at which to evaluate the derivatives der : None or integer How many derivatives to extract; None for all potentially nonzero derivatives (that is a number equal to the number of points). This number includes the function value as 0th derivative. Returns : ——- : d : array If the interpolator’s values are R-dimensional then the returned array will be der by N by R. If x is a scalar, the middle dimension will be dropped; if R is 1 then the last dimension will be dropped.

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