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# numpy.sign

`numpy.``sign`(x[, out])

  Returns an element-wise indication of the sign of a number.

  The sign function returns `-1 if x < 0, 0 if x==0, 1 if x > 0`.

  Parameters : | x : array_like Input values.
  Returns : | y : ndarray The sign of x.

  Examples

      >>> np.sign([-5., 4.5])
      array([-1.,  1.])
      >>> np.sign(0)
      0

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