function y = f(x)

y = sin(4*x);

y = exp(sin(x));

% eps = 1/40;
% y = 1./(eps^2 + sin((x-1/2)*pi).^2);

% x1 = .3;
% x2 = .7;
% eps = .05;
% y = tanh((x-x1)/eps) - tanh((x-x2)/eps);
