MATLAB: Insert Equation directly into the code

Question

This code is for finding roots for an equation. My code runs fine how it is. But I do not like how I have to use the input command to call the function. I want the code to run with the function in the code.

The function I am using is x^2-6. But I cannot not seem to make it happen. It says x is not a defined variable. How do I fix this?

 f1 = input('Equation','s');  %%%%I want f1 = x^2-6
 f = inline(f1);
 xl = 0;
 xu = 10;
 xe = (xl+xu)/(2);
 acc = 0.0001;
 while abs(f(xe))> acc
       i = i + 1;
    if (f(xe)*f(xu)) < 0
        xl = xe;
    else
        xu = xe;
    end
    xe = (xl+xu)/2;
 end
 fprintf('%d)\t%f\tf(x)=%f\n',i,xe,f(xe));

Answer 1

You want to use an anonymous function :

f = @(x) x^2-6;