x_letter_waveall=1.2*x_letter+0.02*sin(20*x_letter)-0.01*cos(30*y_letter);
y_letter_waveall=0.9*y_letter+0.015*sin(25*x_letter+35*y_letter)+...
                 0.04*cos(15*x_letter-20*y_letter);
figure(4777);
plot(x_letter_waveall,y_letter_waveall,'k')
axis([-0.1 1.2 -0.1 1.2])