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# scipy.interpolate.BPoly.derivative

`BPoly.``derivative`(nu=1)

  Construct a new piecewise polynomial representing the derivative.

  Parameters: | nu : int, optional Order of derivative to evaluate. Default is 1, i.e. compute the first derivative. If negative, the antiderivative is returned.
  Returns: | bp : BPoly Piecewise polynomial of order k - nu representing the derivative of this polynomial.