example = vec2d(2,3) 
x coordinate vec2d(x,y) =  2
y coordinate vec2d(x,y) =  3
>>> %Run test3.py
vector 2d = vector two dimensional 
 example = vec2d(2,3) 
x coordinate vec2d(x,y) =  2
y coordinate vec2d(x,y) =  3
>>> %Run test3.py
vector 2d = vector two dimensional 
-----------------------------------
 example = vec2d(2,3) 
x coordinate vec2d(x,y) =  2
y coordinate vec2d(x,y) =  3
------------------------------------
make list : v1 
first index start by 0
first  element : list v1a 2
second element : list v1a 3
------------------------------------
>>> %Run test3.py
vector 2d = vector two dimensional 
-----------------------------------
 example = vec2d(2,3) 
x coordinate vec2d(x,y) =  2
y coordinate vec2d(x,y) =  3
------------------------------------
make list : v1 -> v1a 
first index start by 0
first  element : list v1a = 2
second element : list v1a = 3
------------------------------------
>>> %Run test3.py
vector 2d = vector two dimensional 
-----------------------------------
 example = vec2d(2,3) 
x coordinate vec2d(x,y) =  2
y coordinate vec2d(x,y) =  3
------------------------------------
make list : v1 -> v1a 
first index start by 0
----------------------
first  element : list v1a = 2
second element : list v1a = 3
------------------------------------