Format long error in function

Hi guys,

I am attempting secant method in matlab, my function works perfectly well and outputs results to 4 decimal places. however i want to increase the number of decimal places and i am trying to use format long, however it does not work. Can you kindly take a look at my code

function approx = secant(f,x0,x1,nmax,tol)
format long
i = 2;
p0 = f(x0);
p1 = f(x1);
while i < nmax
    x2 = x1 - (x1-x0)*p1/(p1-p0);
    if abs(x2-x1)<tol
        break
    end
    i = i + 1;
    x0 = x1;
    x1 = x2;
    p0 = p1;
    p1 = f(x2);
    disp(x2)
end
approx = x2;
end

Thank you!

Answer 1

[Geoff Hayes]

ahmed - consider using fprintf and specifiying the number of integers to the right of the decimal point that you are interested. For example, change

disp(x2)

to

fprintf('%.8f\n', x2);

where the .8 indicated that you want to show 8 integers to the right of the decimal point.

[ahmed saheed]

Hi Geoff

Thank you for the clarity.

It worked :)