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• Last Updated : 05 May, 2020

`numpy.ma.MaskedArray.nonzero()` function return the indices of unmasked elements that are not zero. This function returns a tuple of arrays, one for each dimension, containing the indices of the non-zero elements in that dimension.

Return : [tuple] Indices of elements that are non-zero.

Code #1 :

 `# Python program explaining``# numpy.ma.MaskedArray.nonzero() function``   ` `# importing numpy as geek   ``# and numpy.ma module as ma  ``import` `numpy as geek  ``import` `numpy.ma as ma``  ` `arr ``=` `ma.array(geek.eye(``5``))`` ` `gfg ``=` `arr.nonzero()`` ` `print` `(gfg)`

Output :

```(array([0, 1, 2, 3, 4]), array([0, 1, 2, 3, 4]))
```

Code #2 :

 `# Python program explaining``# numpy.ma.MaskedArray.nonzero() function``   ` `# importing numpy as geek   ``# and numpy.ma module as ma  ``import` `numpy as geek  ``import` `numpy.ma as ma``  ` `arr ``=` `ma.array([[``1``, ``2``, ``3``], [``4``, ``5``, ``6``], [``7``, ``8``, ``9``]])`` ` `gfg ``=` `ma.nonzero(arr > ``3``)`` ` `print` `(gfg)`

Output :

```(array([1, 1, 1, 2, 2, 2]), array([0, 1, 2, 0, 1, 2]))
```

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