Numpy object array of numerical arrays

Question

I want to create an array with dtype=np.object, where each element is an array with a numerical type, e.g int or float. For example:

>>>         


        

Answer 1

It's not exactly pretty, but...

import numpy as np

a = np.array([1,2,3])
b = np.array([None, a, a, a])[1:]

print b.dtype, b[0].dtype, b[1].dtype
# object int32 int32