How to apply parameters/for loop

Question

Currently I have a program that finds the dot product of two XYZ coordinates, how would I put this into a loop, so that it goes down a list of coordinates and finds the dot prod

Answer 1

import numpy
v0 = (6,7,6)
vectors = numpy.array([[1,2,3],[4,5,6],[7,8,9]])
dot_products = vectors.dot(v0)

is by far the easiest way to do what you are trying to do imho

and it should be much faster if you have "a lot" of vectors in your vectors list...(for some definition of a lot)

Answer 2

import operator

vector1 = (1, 2, 3)

# get a list of vectors
vectors = [
    (4, 5, 6),
    (7, 8, 9)
]

# for loop through the vectors,
# assignig the current vector to vector2 in every iteration
for vector2 in vectors:
    dotProduct = reduce(operator.add, map(operator.mul, vector1, vector2))
    print dotProduct

Using your l, nat and a variables:

vector1 = (int(l[0][0]), int(l[0][1]), int(l[0][2]))

for a in range(1, nat):
    vector2 = (int(l[a][0]), int(l[a][1]), int(l[a][2]))
    dotProduct = reduce(operator.add, map(operator.mul, vector1, vector2))
    print(dotProduct)