I'm trying to build a meshgrid with small nonnegative integers

default is int32

...

...

np.meshgrid([0,1,2], [0,1])[0].dtype

dtype('int32')

If I use uint, then the arrays are upcast to int64 - Why?

...

...

np.meshgrid(np.array([0,1,2], np.uint), np.array([0,1],

np.uint))[0].dtype dtype('int64')

broadcast_arrays preserves dtype

...

...

np.broadcast_arrays(np.array([0,1,2], np.uint)[:,None], np.array([0,1],

np.uint)[None, :]) [array([[0, 0], [1, 1], [2, 2]], dtype=uint32), array([[0, 1], [0, 1], [0, 1]], dtype=uint32)]

with uint8

...

...

np.broadcast_arrays(np.array([0,1,2], np.uint8)[:,None],

np.array([0,1], np.uint8)[None, :]) [array([[0, 0], [1, 1], [2, 2]], dtype=uint8), array([[0, 1], [0, 1], [0, 1]], dtype=uint8)]

...

...

np.meshgrid(np.array([0,1,2], np.uint8), np.array([0,1],

np.uint8))[0].dtype dtype('int32')

...

...

Winpython 64 bit

...

...

np.__version__

'1.9.2rc1'

Josef