object: [1.6,-8.7]
same: True

object: 0 : [  4.6 -3.7 ]
1 : [  8.4  6.3 ]
same: True

object: [x,y,z]
same: True

object: [1,2,4]
same: True

object: [[ 1 2 ]
 [ 3 4 ]]
same: True

object: [x1,x2]->[y1=x1+x2]
same: True

