function f = funcao_ondinhas(x,y)
% T = 1;
% x = 2*(x/T) - 1;
% y = 2*(y/T) - 1;

x1 = x;
y1 = y;
u = 10*x1+5*y1;
r2 = x1^2+y1^2;
f = exp(-r2/0.015)*cos(pi*u); %ondinha encolhida 0.009

%original 
% u = 7*x1+5*y1;
% r2 = x1^2+y1^2;
% f = exp(-r2/0.05)*cos(pi*u);