I'm attempting to append a 1D array which have generated by appending elements one at a time to a 2D array as a new row in the array. I'm pretty lost as to why this code doesn't work? They are both arrays of 5 elements, but get the following error? "ValueError: all the input arrays must have same number of

Appending 1D Ndarray to 2D Ndarray

I’m attempting to append a 1D array which have generated by appending elements one at a time to a 2D array as a new row in the array.

    a = np.ones((2, 5), int)
    b = np.empty((0, 5), int)

    b = np.append(b, [1])
    b = np.append(b, [2])
    b = np.append(b, [3])
    b = np.append(b, [4])
    b = np.append(b, [5])

    a = np.append(a, b, axis=0)

    print(b)

I’m pretty lost as to why this code doesn’t work? They are both arrays of 5 elements, but get the following error? “ValueError: all the input arrays must have same number of dimensions”

Answer

a and b have different dim a is (2,5) and b is (5,) reshape b to be (1,5).

Then you can append b row-wise as following:

result=np.append(a,b.reshape(1,-1),axis=0)

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Answer