data1=load('metoda1.dat');
x1=data1(:,1);
y1=data1(:,2);
relchyba1=data1(:,3);
plot(x1,y1,'r-');
hold on; 
data2=load('metoda2.dat');
x2=data2(:,1);
y2=data2(:,2);
relchyba2=data2(:,3);
plot(x2,y2,'g-');