ValueError: all the input arrays must have same number of dimensions

Question

I\'m having a problem with np.append.

I\'m trying to duplicate the last column of 20x361 matrix n_list_converted by using the code below:

Answer 1

(n,) and (n,1) are not the same shape. Try casting the vector to an array by using the [:, None] notation:

n_lists = np.append(n_list_converted, n_last[:, None], axis=1)

Alternatively, when extracting n_last you can use

n_last = n_list_converted[:, -1:]

to get a (20, 1) array.