Help me on function definition

[Roel Schroeven]

aeneng schreef:
> Hello everyone,
> 
> I am just starting to use python in numerical cacluation. 
> I need you to help me to see what's wrong with the following piece of 
> codes, which computes the cross product of two vectors and returns 
> the result. u and v are two 3x1 matrix.
> 
> when I import the function, error message show like this
>>>> import cross
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "cross.py", line 8
>     ppp2=u[2]*v[0]-u[0]*v[2]
>     ^
> SyntaxError: invalid syntax
> 
> WHAT IS WRONG WITH MY CODE?
> 
> I appreciate your help.
> 
> ##here is the function definition.
> ##cross.py##
> def cross(u,v)
>     """input two vectors u and v in 3-D space,     
>        output a cross product of vector w, in column or in row 
> accordingly."""
>     ppp1,ppp2,ppp3=0.0,0.0,0.0

You forgot the : after def cross(u, v)

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
   -- Isaac Asimov

Roel Schroeven