How to construct matrix from vectors?

[Fabien]

On 06/21/2015 07:21 AM, Nasser M. Abbasi wrote:
> v1=np.array([(1,2,3)]).T
> v2=np.array([(4,5,6)]).T
> v3=np.array([(7,8,9)]).T
> v4=np.array([(10,11,12)]).T
>
> mat =np.hstack(( np.vstack((v1,v3)), np.vstack((v2,v4))) )
>
> Out[236]:
> array([[ 1,  4],
>         [ 2,  5],
>         [ 3,  6],
>         [ 7, 10],
>         [ 8, 11],
>         [ 9, 12]])
>
> There are way too many '(([[]]))' things  in Python :)

another solution with less "(([[]]))", and less ";". There are way too 
many ";" in Matlab ;)

import numpy as np
v1 = [1, 2, 3]
v2 = [4, 5, 6]
v3 = [7, 8, 9]
v4 = [10, 11, 12]
np.hstack([[v1, v2], [v3, v4]]).T
Out[]:
array([[ 1,  4],
        [ 2,  5],
        [ 3,  6],
        [ 7, 10],
        [ 8, 11],
        [ 9, 12]])