Can anyone give me an example of an endomorphism of a vector space?

Question

anonymous · Answer

Is this calculus?

turingtest · Answer

Linear algebra in this case, but there seem to be other kinds of endomorphisms. I probably should have been more specific.

anonymous · Answer

Ah, whats the difference between linear and regular algebra?

turingtest · Answer

A lot, it's pretty hard to explain. 
Linear algebra has to do with vectors, matrices, things like that. You probably don't know those terms though, but you will meet them soon enough.

anonymous · Answer

Ok :D

anonymous · Answer

this one maps to itself.  L:V->V

turingtest · Answer

I know that, I wanted an example of one that is actually used specifically.

anonymous · Answer

Ok, say V is in R3.  Let L be a 3x3 matrix and L takes V into V

anonymous · Answer

for R2 the matrix 
| cos x  -sin x |
| sin x     cos x|
rotates a vector in R@2

turingtest · Answer

Thanks