### Navigation

- index
- modules |
- modules |
- previous |
- NumPy v1.7 Manual (DRAFT) »
- NumPy Reference »
- Routines »
- Sorting, searching, and counting »

# 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

### Navigation

- index
- modules |
- modules |
- previous |
- NumPy v1.7 Manual (DRAFT) »
- NumPy Reference »
- Routines »
- Sorting, searching, and counting »