visualize the golden section search

i have tried to visualize the code i did for the golden sectiom search but the figure window pops up with nothing to show. can someone help me out?

%%%Author: Enow Leonard Baiye %%% Golden Search Algorithm clear all clc syms x %%Input fx = (310/5.0862)*((sin((314.1593*0.0025)-0.6658))-(sin(x-0.6658))*(exp((x-(314.1593*0.0025))/(314.1593*0.0025)))); maxit = 50; es = 10^-4; R = (5^.5-1)/2; %%Determine the Interval for the Initial Guess x=[-10:10]; f = subs(fx,x); xlow = 0; xhigh = 1.4217; %%Perform Golden Search xl = xlow; xu = xhigh; iter = 1; d = R*(xu-xl); x1 = xl+d; x2 = xu-d; f1 = subs(fx,x1); f2 = subs(fx,x2); if f1>f2 xopt = x1; else xopt = x2; end % HI-REST FUNCTION xa=xl; xb=xu; xx=linspace(xa,xb); F =subs(fx,xx); while(1) %viturlise plot(xx,F); d = R*d; if f1>f2 xl = x2; x2 = x1; x1 = xl+d; f2 = f1; f1 = subs(fx,x1); else xu = x1; x1 = x2; x2 = xu-d; f1 = f2; f2 = subs(fx,x2); end iter = iter+1; if f1>f2 xopt = x1; else xopt = x2; end if xopt~=0 ea = (1-R)*abs((xu-xl)/xopt)*100; end if ea<=es||iter>=maxit,break end end Gold = xopt