Numpy concatenate 2D arrays with 1D array

Question

I am trying to concatenate 4 arrays, one 1D array of shape (78427,) and 3 2D array of shape (78427, 375/81/103). Basically this are 4 arrays with features for 78427 images,

Answer 1

Try concatenating X_Yscores[:, None] (or X_Yscores[:, np.newaxis] as imaluengo suggests). This creates a 2D array out of a 1D array.

Example:

A = np.array([1, 2, 3])
print A.shape
print A[:, None].shape

Output:

(3,)
(3,1)