MATLAB: Inline ; use anonymous functions instead.

anonymous functionsinline()MATLAB and Simulink Student Suite

obviously, I an not a programmer. I saw this code for newton raphson method (for schoolwork), but when i tried to run it, it said that Ishould use an anonymous functions instead. what should i do? 
clear , clc
cf=input('ingrese funcion a evaluar: ');
syms x
f=inline(cf);
derivada=diff(cf,x);
df=inline(derivada);
tol = input('ingrese tolerancia: ');
error = 50;
x=input('ingrese un valor inicial: ');
n =0;
disp('    n             xi       error')
while (error>tol)
fprintf('\t%i\t%3.5f\t%f\n', n, x, error);
n=n+1;
x=x-f(x)/df(x);
error= abs(f(x));
end

Best Answer

see inline() input should be a string
cf=input('ingrese funcion a evaluar: ','s');
derivada=diff(str2sym(cf),x); %change this line too
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