unc_n2_rastriginplot.m

it contains many classic Test Problems for Unconstrained Optimization such as camel6,treccani,goldst

% lb=-1;
% ub=1;
% teix=0.01;
% [X,Y] = meshgrid(lb:teix:ub);
% Z=X.*X+Y.*Y-cos(18*X)-cos(18*Y);
% mesh(X,Y,Z)
% axis([lb ub lb ub -2 5]);
% title('unc#n2#rastrigin');
% xlabel('x');
% ylabel('y');
% zlabel('z')


% %contour
lb=-1;
ub=1;
teix=0.01;
[X,Y] = meshgrid(lb:teix:ub,lb:teix:ub);
Z=X.*X+Y.*Y-cos(18*X)-cos(18*Y);
v=[ -2 -1 0 0.5 1 2];
[c,h]=contour(X,Y,Z,v);
clabel(c,h);
title('unc#n2#rastrigin');
xlabel('x');
ylabel('y');