Saving arrays as columns with np.savetxt

Question

I am trying to do something that is probable very simple. I would like to save three arrays to a file as columns using 'np.savetxt' When I try this

x = [1,2,3,4] y = [5,6,7,8] z = [9,10,11,12]  np.savetxt('myfile.txt', (x,y,z), fmt='%.18g', delimiter=' ', newline=os.linesep) 

The arrays are saved like this

1 2 3 4 5 6 7 8 9 10 11 12 

But what I wold like is this

1 5 9 2 6 10 3 7 11 4 8 12 

Answer 1

Use numpy.c_[]:

np.savetxt('myfile.txt', np.c_[x,y,z]) 

Answer 2

Use numpy.transpose():

np.savetxt('myfile.txt', np.transpose([x,y,z])) 

I find this more intuitive than using np.c_[].