## Question

Asked By – IUnknown

We initialize a numpy array with zeros as bellow:

```
np.zeros((N,N+1))
```

But how do we check whether all elements in a given n*n numpy array matrix is zero.

The method just need to return a True if all the values are indeed zero.

**Now we will see solution for issue: Test if numpy array contains only zeros **

## Answer

Check out numpy.count_nonzero.

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

This question is answered By – Prashant Kumar

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