how to append a numpy matrix into an empty numpy array

Question

I want to append a numpy array(matrix) into an array through a loop

data=[[2 2 2] [3 3 3]]
Weights=[[4 4 4] [4 4 4] [4 4 4]]
All=np.array([])  
for i in data:
           


        

Answer 1

It may not be the best solution but it seems to work.

data = np.array([[2, 2, 2], [3, 3, 3]])
Weights = np.array([[4, 4, 4], [4, 4, 4], [4, 4, 4]])
All = []

for i in data:
    for j in Weights:
        h = i * j
        All.append(h)

All = np.array(All)

I'd like to say it's not the best solution because it appends the result to a list and at the end converts the list in a numpy array but it works good for small applications. I mean if you have to do heavy calculations like this it's i would consider finding another method. Anyway with this method you don't have to think about the number conversions from floating point. Hope this helps.