using a function as a parameter

[José Miguel Pereira Tavares]

        Hi all!

        I'm new to octave (and never used mathlab) and I would like to know if 
it's possible to pass a function as a parameter to another function, and 
if sou how?

        For example, if I define a function as:

        function xpto = f(x)
        xpto = x^2;
        endfunction

        How could I plot this function? Something like

        plot(f(x)) ????

        Another question, is octave capable of finding the derivative of a 
function (can it find it's expression? or it's value for a given x?)

        I thank you in advance for your time and patience.

                                        Miguel Tavares

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