data=load('derivace.dat');
h=data(:,1);
skutecna_der=data(:,2);
num1_der=data(:,3);
relchyba1=abs(data(:,4));
num2_der=data(:,5);
relchyba2=abs(data(:,6));
relchyba5=abs(data(:,8));
loglog(h,relchyba1,'r-');
hold on;
loglog(h,relchyba2,'g-');
loglog(h,relchyba5,'b-');