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

Question

l have three arrays to append. Here a sample of my vectors :

V1=array([ 0.03317591, -0.01624349, -0.01151019])
V2=array([[ 0.06865846, -0.00223798],
       [-0.         


        

Answer 1

To use np.hstack, we need to convert V1 to 2D such that the lengths along the first axis for the three input arrays are the same -

np.hstack((V1[:,None],V2,V3))

As alternatives, we can use np.column_stack or np.concatenate along the second axis on 2D converted V1 alongwith others or np.c_ -

np.column_stack((V1,V2,V3))
np.concatenate([V1[:,None],V2,V3],axis=1)
np.c_[V1,V2,V3]