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# scipy.special.polygamma

`scipy.special.``polygamma`(n, x)

  Polygamma function which is the nth derivative of the digamma (psi) function.

  Parameters: | n : array_like of int The order of the derivative of `psi`. x : array_like Where to evaluate the polygamma function.
  Returns: | polygamma : ndarray The result.

  Examples

      >>> from scipy import special
      >>> x = [2, 3, 25.5]
      >>> special.polygamma(1, x)
      array([ 0.64493407,  0.39493407,  0.03999467])
      >>> special.polygamma(0, x) == special.psi(x)
      array([ True,  True,  True], dtype=bool)