x=-10:1:10;nx=length(x);
y=-10:1:10;ny=length(y);
[X,Y]=meshgrid(x,y) 
Z=X.^2-Y.^2+eps;

%figure;contour(Z); grid on;
figure; meshc(x,y,Z); grid on
title('Priklad 1.2.b)');
xlabel('os x');
ylabel('os y');