Manipulating data frames....

I have learned a little from this post which is all about manipulating data frames:

http://www.r-bloggers.com/select-operations-on-r-data-frames/

It's a little complex but well worth understanding!

for adding columns and rows, it seems like cbind and rbind are the way to go.

However, it's important first to make your columns... they have to be the same size.