Soo Min Kang

Putting square brackets around the `a` solved the problem for me: `fv = np.concatenate([np.concatenate([a]), np.concatenate(b), np.concatenate(c)])`

Did this not work for you? > Putting square brackets around the `a` solved the problem for me: > `fv = np.concatenate([np.concatenate([a]), np.concatenate(b), np.concatenate(c)])`