[geometry] vectors [calc III]

I was struggling on a problem in my homework the other day. I don't remember exactly what the problem was, but it had to do with finding the (unit) normal (and binormal) vector from a point on a line in 3 dimensional space.

I couldn't figure out how to get a normal vector from a single vector (the one defining the line). Is there a simple way to do this that I am overlooking?

There is no single normal vector to a line.

It's like the 5th week of classes?  You should be doing partial derivatives by now.

>>3
5th week for semester system.  For the quarter system, it's only the 2nd week.  Of course, every school is different, so who knows.

Normal vectors have to do with planes. Unit vectors are found by taking the vector in question, say <a, b, c> and finding its length: (a^2 + b^2 + c^2)^1/2. Let the length of <a, b, c> = L. Take <a, b, c> and divide it by L such that the unit vector is represented by (1/L)<a, b, c>. This is your unit vector.