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
ppp1=u[1]*v[2]-u[2]*v[1]
ppp2=u[2]*v[0]-u[0]*v[2]
ppp3=u[0]*v[1]-u[1]*v[0]
# store the result of the cross product in u
u[0]=ppp1
u[1]=ppp2
u[2]=ppp3
return u #return the cross product of vector u x v.
if __name__=="__main__":
from cvxopt.base import matrix
u=matrix([1.0,0.0,0.0],(3,1))
v=matrix([0.0,1.0,0.0],(3,1))
print cross(u,v)
print "file name is %s" %__name__
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