I have a problem with np.append(ar,values, axis=None)

Take a look at following codes:

import numpy as np

array1 = np.array([])
array2 = np.array([1,2])
array3 = np.array([3,4])
array4 = np.array([5,6])

array1 = np.append(array1, array2)
array1 = np.append(array1, array3)
array1 = np.append(array1, array4)

print(array1) # [1. 2. 3. 4. 5. 6.]

So this is not what i want i want add exactly the array to the array1 and the array1 should be

[[1. 2.]
 [3. 4.]
 [5. 6.]]

How can i do that?

CodePudding user response：

You need to stack the arrays.

array1 = np.stack([array2, array3, array4])

should do it.

CodePudding user response：

Try this:

array1 = np.array([])
array2 = np.array([1,2])
array3 = np.array([3,4])
array4 = np.array([5,6])


a = np.array([array2])
b = np.array([array3])
c = np.array([array4])

print(np.vstack((a, b, c)))