clear all
close all
clc

t = -10:0.1:10;
s = tanh(t);
figure(1)
for t0 = -9:10
    i = t0+10; % indice di riferimento
    subplot(4,5,i)
    s1 = tanh(t0-t);
    plot(t,s,'-b',t,s1,'-r')
    title(['t_0 = ', num2str(t0)])
    grid
end