forward, backward, and centered difference method

I am new to MatLab. How can I solve below:

x 1 2 3 4 5 6

f(x) 2 3 1 5 4 1

Estimate f 0 (4) using the forward, backward, and centered difference method with h = 1.

[James Tursa]

What have you done so far? What specific problems are you having with your code?

[BEENA BASHEER]

I am new to matlab, I am confused if i declare x and f(x) declare as an array. then to find forward diff method the equation also contains x as input.

[Torsten]

What is f 0 (4) ?

[BEENA BASHEER]

need to find f'(4), x=4, h=1 . I have already done through manually. But how to program it ?

[James Tursa]

Please show us what you did manually. Not just the result ... show us the computations you did.