% Zilinskas' Function # 2 
% Range of initial points: -2 <= x <= 2 or 0 <= x <= 1
% Global minima: x=0.75
% f(x)=-1.125
% Coded by: Ali R. Alroomi | Last Update: 13 Jan. 2015 | www.al-roomi.org
 
clear
clc
warning off
 
xmin=-2;
xmax=2;
R=100000; % steps resolution
x=xmin:(xmax-xmin)/R:xmax;
    
for i=1:length(x)
    f(i)=2*(x(i)-0.75).^2+sin(8*pi*x(i)-(pi/2))-0.125;
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');