t = 0:0.1:10;
x = exp(-0.2*t) .* cos(2*t);
y = exp(-0.2*t) .* sin(2*t);
plot3(x,y,t,'LineWidth',2);
title('\bfThree-Dimensional Line Plot');
xlabel('\bfx');
ylabel('\bfy');
zlabel('\bftime');
grid on;