In [3]: o.zeros(3)
warning: Adding json.jar to the dynamic Java class path. This has cleared matlab internal states, such as global variables, persistent variables, or mex functions. To avoid this, call json.startup before using other json API functions. See
<a href="matlab:doc javaaddpath">javaaddpath</a> for more information.
Out[3]:
{'message': 'Successfully completed request',
 'success': 'true',
 'result': array([[ 0.,  0.,  0.],
        [ 0.,  0.,  0.],
        [ 0.,  0.,  0.]])}