> ListTools:-Rotate([a,b,c,d],1);
                          [b, c, d, a]

> ListTools:-Rotate([a,b,c,d],2);
                          [c, d, a, b]

> ListTools:-Rotate([a,b,c,d],-1);
                          [d, a, b, c]

with(plots):

odeplot(dsn, [t,u(t)], 0..tmax);

See ?odeplot for more examples.