- #1
PsychonautQQ
- 784
- 10
I'm confused why when using cylindrical coordinates three unit vectors are needed. My book says that the three unit vectors are one for the radial direction which is bound to the xy plane and then a unit vector in the z direction. It goes on to say that there is another unit vector associated with an angle from the x-axis to the point, but isn't this unit vector just redundant information from the radial unit vector? Why is it necessary?