MATLAB: L’hopital rule doesn’t work

l'hopital

I'm making an application to use l'hopital's rule. When I use this function, nothing comes up for it. Why so?
function y=mylhopital(f,g) %f&g are function handles
syms x
while(limit(f,x,0)==0 & limit(g,x,0)==0) %When the limit of f(x) and g(x) approaches to zero and the value is both zero
f=diff(f(x)); %Differentiate f with respect to x
g=diff(g(x)); %Differentiate g with respect to x
end
y=limit(f,x,0)/limit(g,x,0);

Best Answer

You didn't assign diff(f(x)) and diff(g(x)) to anything.
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