Returns array of indices of the maximum values along the given axis. Masked values are treated as if they had the value fill_value.
| Parameters : | axis : {None, integer} 
 fill_value : {var}, optional 
 out : {None, array}, optional 
  | 
|---|---|
| Returns : | index_array : {integer_array}  | 
Examples
>>> a = np.arange(6).reshape(2,3)
>>> a.argmax()
5
>>> a.argmax(0)
array([1, 1, 1])
>>> a.argmax(1)
array([2, 2])