for k = 1:101
    x(k) = (k-1)*0.01;
    u(k) = sin(6*pi*x(k))*exp(-x(k));
    v(k) = cos(6*pi*x(k))*exp(-x(k));
    z(k) = 0;
end
plot(x,u,'k-',x,v,'r--',x,z,'k:')