MATLAB easy Syntax quesion

I am very new to using MATLAB and I am having a lot of trouble calling this function for a given f(x)

What would I put in the command window to call f(x) = x^-1 - tan(x) on [0,pi/2)

Here is the bisection code that I am using:

function [a,b,u,v] = bisection(a,b,f,M,delta,epsilon)

u = f(a);

v= f(b);

e = b - a;

if sign(u) == sign(v)

    return;
end

for k=1:M

    e = e/2;
    c = a + e;
    w = f(c);
    if (abs(e) < delta) || (abs(w) < epsilon)
        return;
    end
    if sign(w) ~= sign(u)
        b = c;
        v = w;
    else
        a = c;
        u = w;
    end

end

[Matt Kindig]

In your function, is 'f' supposed to be a function handle? If so, you would call your bisection function as:

[a,b,u,v]= bisection(a,b, @(x) x.^(-1)-tan(x), M, delta, epsilon)