import graph;
size(200,100,IgnoreAspect);
 
real f(real x) {
  return sin(2*pi*x);
}
 
string fmt(real x) {
  return "";
}
 
draw(graph(f, 0, 2, operator..), red);
xaxis("$x$",Ticks(N=0,n=4,Step=0.5,ticklabel=fmt));
yaxis("$y(x)$",Ticks(N=0,n=4,Step=1, ticklabel=fmt));
 
Label lambda=Label("$\lambda$",align=N,blue);
draw(L=lambda, (0.25, 1) -- (1.25, 1), blue, Arrows);
draw(L=lambda, (0.50, 0) -- (1.50, 0), blue, Arrows);
draw(L=lambda, (0.75,-1) -- (1.75,-1), blue, Arrows);