Why is the answer in my command window multiplying every time I press run??

So I got the correct code..I think but when I press run the answer first showed up as x2 and when I pressed run the answer showed up x4 on command window.

My function:

function x=my_newton(f,Df,x0,tol)

%f=@(x)(x.^3-cos(4*x));
%Df=@(x)((3*x^2)+(4*sin(4*x)));
x=x0;kmax=10; tol=0.5e-8;

for k=1:kmax
    d=-f(x)/Df(x);
    x=x+d;
    disp([x d])
    if abs(d)<tol, break 
    end
end

msg=sprintf('warning');

if k==kmax, disp(msg);
end

And in a separate script I run:

f=@(x)(x.^3-cos(4*x));
x=linspace(-3,7);
plot(x,f(x))
axis([-3 7 -5 10]);grid on
hold on

%--------------

f=@(x)(x.^3-cos(4*x));
Df=@(x)((3*x^2)+(4*sin(4*x)));

x=my_newton(f,Df,[-0.9],1e-8);
x=my_newton(f,Df,[-0.4],1e-8);
x=my_newton(f,Df,[0.4],1e-8);

I get correct answer in Command window but first the answer showed up in x2 and then when I pressed again run and it just multiplies....What is wrong?

[Chad Greene]

What do you mean by "x2"? Do you mean something times two? Or do you have some variable called x2 that you haven't shown us? If a value is changing each time you run your script, try clearing before running the script.

[Britney]

Hi! Yes that is what I mean. x2= times 2

Ok, I tried clear before I execute the functions and nothing changed.

[Bruno Pop-Stefanov]

Can you clarify what gets multiplied? I just ran your code several times and everything looks the same after each run.

[Bruno Pop-Stefanov]

Check that you don't have any persistent or global variables. Don't just run clear but do:

    clear all

[Andrew Reibold]

definitely has to be related to clearing.

[Britney]

sorry I saw just now that you commented on my question. I figured out what was wrong. It was the disp() in my while loop. I just put a % in front of it and my code worked out fine.

Thank you for taking the time.