L'hopital rule doesn't work?

Question

Andy 2012-10-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/50721-l-hopital-rule-doesn-t-work

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);