% Problem # 6 (Zilinskas-Shaltyanis' or Richard Brent's Function # 1)
% Range of initial points: -10 <= x <= 10
% Global maxima: x=0.679578666600993 
% f(x)=0.824239398476077
% Coded by: Ali R. Alroomi | Last Update: 14 Feb. 2015 | www.al-roomi.org
 
clear
clc
warning off
 
xmin=-10;
xmax=10;
R=100000; % steps resolution
x=xmin:(xmax-xmin)/R:xmax;
    
for i=1:length(x)
    f(i)=(x(i)+sin(x(i)))*exp(-x(i)^2);
end
 
plot(x,f,'r','LineWidth',2);grid;set(gca,'FontSize',12);
xlabel('x','FontName','Times','FontSize',20,'FontAngle','italic');
ylabel('f(x)','FontName','Times','FontSize',20,'FontAngle','italic');