cast numpy array to long code example

Example 1: np convert to int

>>> x = np.array([[1.0, 2.3], [1.3, 2.9]])
>>> x
array([[ 1. ,  2.3],
       [ 1.3,  2.9]])
>>> x.astype(int)
array([[1, 2],
       [1, 2]])

Example 2: np float to int

int_array = float_array.astype(int)