x1=[-11.39 -6.88 -2.162 -0.77 -0.404 -0.205 -0.2  0 0.2 0.205 0.395 0.533 0.624 0.7 0.77];
y1=[0 0 0 0 0 0 0 0 0 0 0.01 0.41 2.37 8.57 20.76];
x2=[0 0];
y2=[-5 30 ];
x3=[0.7 0.7];
hold off
plot(x1,y1)
hold on
axis([-4 3 -2 20])
xlabel('Wartosc napiecia [ V ]','fontsize', 20)
ylabel('Wartosc natezenia [ mA ]','fontsize', 20)
title('Charakterystyka diody krzemowej','fontsize', 20)
plot(x2, y2, 'k', 'linewidth', 4)
plot(y2, x2, 'k', 'linewidth', 4)
plot(x1, y1, '-o','linewidth', 2)
plot(x3, y2, '--k','linewidth', 2)
set(gca,'fontsize',14);
text(0.8,2,'x= 0.7')