What's the difference between numerical method to
calculate differential (backward, central, forward)? At what
condition do I have to use forward over central and backward, etc?
If there's boundary condition that permits the complete use of
central method, what will happen if I still use forward, backward,
and central regardless there's boundary condition that permits the
use of central method?
note: I'm not used to describe pure mathematical problem in
english, so I'm sorry if my question is hard to...