In creating the vector R,G,F and H you forgot a vector index at the argumebt x. So the full vector is evaluated for every i and you create a nested vector which sure wasn't intended. You may also create those vectors without using the range i. (see attached sheet).
As Valery already stated you haven't defined functions f,g or r and so you can't plot any of them. It would be easy to define those function (see atatched sheet) but you may also simply plot the vectors F,G,R over the vector x.
