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[英]How do I convert a 2D numpy array into a 1D numpy array of 1D numpy arrays?
[英]Convert numpy array of arrays to a 2D numpy array
我有一個numpy數組的numpy數組,我想將其轉換為2d numpy數組。 例如
#Init Sub Arrays
a = np.array([1,2])
b = np.array([3,4,5])
c = np.array([2,1])
d = np.array([5,4,3])
#Combine Sub Arrays
e = np.array([[a,b],[c,d]])
#Sample Sub Arrays
f = e[:,0]
#Attempt to convert sub np arrays to 2d np array
g = np.array(f)
expected = np.array([[1,2],[2,1]])
print("Actual 1: ",f)
print("Actual 2: ",g)
print("Expected:", expected)
print("Actual 1: ",np.ravel(f))
print("Actual 2: ",np.ravel(g))
print("Expected: ",np.ravel(expected))
輸出:
Actual 1: [array([1, 2]) array([2, 1])]
Actual 2: [array([1, 2]) array([2, 1])]
Expected: [[1 2]
[2 1]]
Actual 1: [array([1, 2]) array([2, 1])]
Actual 2: [array([1, 2]) array([2, 1])]
Expected: [1 2 2 1]
我了解該數組的初始化方式是因為numpy在同一維上不支持長度不同的數組,但是我想知道如何將“ hack” numpy數組的有效樣本轉換為“ valid” numpy數組
您可以只使用np.vstack
:
out = np.vstack(e[:,0])
print(out)
array([[1, 2],
[2, 1]])
print(out.ravel())
array([1, 2, 2, 1])
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