MATLAB: Fixed point (matematice)

fixed-pointfunctionnormtolwhilewhile loop

Hello.
I have attempt to code a fixed point in MATLAB. But I don't know if this correct, but I think it works.
 function sol=fixpunkt(g,x0,tol) 
xnew=x0; 
xold=x0+2*tol; 
while norm(xold-xnew)>tol 
        xnew  =  xnew     
      xnew=g(x0) ;   
  end
  sol=xnew;
When I tried fixpunkt(1,1,5) in the command window, MATLAB works 'busy' for a long long time, I guess it is the while loop doing that,
I would be happy if someone can give a opinion about this.
Regards Cillian

Best Answer

xold never gets updated, so xnew gets set to the same value every iteration, and the loop never ends ...
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