Replacing sub array in Numpy array

[scidam]

You cann't do this with default dtype (np.float64). However, numpy arrays are mutable,
so, if you define a-array with dtype= np.object,everything should work fine.
Try the following example:

a = np.array([1,3,4], dtype=np.object)
b = np.array([0])
a[0] = b
print(a)
b[0] = 99
print(a)