Warning: The method char/diff will be removed

While running this algorithm I am getting the following warning can anyone helpme to solve it?

Warning: The method char/diff will be removed in a future release. Use sym/diffinstead. For example diff(sym('x^2')). After removal diff('x^2') will return diff(double('x^2')).

dR=diff(aaa.R);

     d2R=diff(dR);
        xi=1;
     e=0.0001;
   ea=1000;
  c=1;
 x=xi;
while ea>e 
 g=eval(aaa.R);
  h=eval(dR);
   k=eval(d2R);
     j=x-(g*h)/(h^(2)-(g*k));
   ea=abs((j-x)/j*100);
  x=j;
 c=c+1;
end

resultado = j;

[Jan]

And in which line does this warning appear? We cannot guess this detail.

Answer 1

[Jan]

The warning message suggests to replace diff('YourString') by diff(sym('YourString')). Therefore I assume, that this would be a good strategy. Did you try this already?

[Jsierra]

Thanks Jan !!!