Conversion to logical from sym is not possible? please help

I am trying to build a newton raphson program to solve nonlinear equations. this is the function. for some reason i cant get it to work.

% Program Code of Newton-Raphson Method in MATLAB 

a=input('Enter the function in the form of variable x:','s');
x(1)=input('Enter Initial Guess:');
error=input('Enter allowed Error:');
f=inline(a)
dif=diff(sym(a));
d=inline(dif);
for i=1:100
x(i+1)=x(i)-((f(x(i))/d(x(i))));
err(i)=abs((x(i+1)-x(i))/x(i));
if err(i)<error
break
end
end
root=x(i)

here is my script to call the function
where i recieve the error message.

syms x

y =@(x)(exp((x-2)^2)-2);

%dy = diff(y(x));

hello(y,0,0.001)

Answer 1

[Walter Roberson]

Using inline() is not recommended unless you are stuck at MATLAB 5.0 or earlier. Use matlabFunction() instead for this case.

[Abdurahman Itani]

what does matlabfunction() do ? how can I use it?

[Walter Roberson]

https://www.mathworks.com/help/symbolic/matlabfunction.html

"g = matlabFunction(f) converts the symbolic expression or function f to a MATLAB® function with handle g. The function can be used without Symbolic Math Toolbox™."