MATLAB - Bisection Method

% ****** To find root of given equation by bisection method ******
% ********************** By Mahesha MG ***************************
display('Equation is x^2+x-2 = 0')
i=1;
while(i)

     xl=input('Enter lower value:');
     xu=input('Enter upper value: ');
     e=input('Enter accuracy: ');
    if equan(xl)*equan(xu)<0
        i=0;
    else
        warning('Enter proper range');
    end

end
if equan(xl)<0
    xn=xl;
    xp=xu;
else
    xn=xu;
    xp=xl;
end
while (abs(xn-xp)>e)
    xm=(xn+xp)/2;
    if equan(xm)<0
        xn=xm;
    else

        xp=xm;
    end
end
Root=xm

Equation is x^2+x-2 = 0

Enter lower value:3
Enter upper value: 5
Enter accuracy: .0001
Warning: Enter proper range 
> In bisection at 12 
Enter lower value:0
Enter upper value: 3
Enter accuracy: .0001
Root =

    1.0000


% Equation to be solved
function[eqn]=equan(x);
eqn=x^2+x-2;



Published with MATLAB® 7.13