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# scipy.interpolate.PiecewisePolynomial.derivative

`PiecewisePolynomial.``derivative`(x, der)

  Evaluate a derivative of the piecewise polynomial

  Parameters : | x : scalar or array-like of length N der : integer which single derivative to extract
  Returns : | y : scalar or array-like of length R or length N or N by R

  Notes

  This currently computes (using self.derivatives()) all derivatives of the curve segment containing each x but returns only one.

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