x = numpy.array([(1, 2), (3, 4)], dtype=[('a', '<f4'), ('b', '<f4')])
y = numpy.array([(5, 6), (7, 8)], dtype=[('a', '<f4'), ('b', '<f4')])
numpy.vstack((x, y))
numpy.hstack((x, y))
numpy.dstack((x, y))
python: numpy: concatenation of named arrays