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# numpy.count_nonzero

`numpy.``count_nonzero`(a)

  Counts the number of non-zero values in the array `a`.

  Parameters: | a : array_like The array for which to count non-zeros.
  Returns: | count : int or array of int Number of non-zero values in the array.

  See also

  `nonzero`
    Return the coordinates of all the non-zero values.

  Examples

      >>> np.count_nonzero(np.eye(4))
      4
      >>> np.count_nonzero([[0,1,7,0,0],[3,0,0,2,19]])
      5