time = [0,0.64,1.28,1.92,2.56,3.2,3.84,4.48];
data = [0,0.5,1.5,2.5,3.5,4.5,5.5,6.5];
plot(time,data)
hold on
Values=interp1(time,data,1:3);
% ^^^---- 1 to 3 seconds , linear interpolation see the link for other methods
plot(1:3,Values,'+k')
