>>> concat([1,2,3,4,5] , [1,2,3,4,5]])
    [1, 2, 3, 4, 5, 1, 2, 3, 4, 5]

def concat(args):
    """
    >>> concat([1,2,3,4,5] , [1,2,3,4,5]])
    [1, 2, 3, 4, 5, 1, 2, 3, 4, 5]
    """
    import pdb
    pdb.set_trace()
    t = [matlabarray(a) for a in args]
    return np.concatenate(t)