finding numerical integration of vectors

I have two vectors and I want the numerical integration of the product of this two vectors from zero to infinity. For example, P=integral(A(u)B(u))du from 0 to infinity. A(u) and B(u) are vectors.

How can I do that? Can I use P=trapz(A(u).*B(u))?

Answer 1

[Torsten]

P = trapz(U,AU.*BU);

where AU and BU are the vectors evaluated at U.

Best wishes

Torsten.