Thanks Sswift. I only need the angle on the xz plane really so this won't hold. In the pictures above the y component would not be 0 if it was at right angles to both vectors.
In example (1) the new vector can't be at 90 degrees to both vectors . I should have explained better I guess - can this be done?
In example (1) the new vector can't be at 90 degrees to both vectors . I should have explained better I guess - can this be done?