clear
clc
close all

y = [1 2 2.2 3 2.8 4.5 5 8 9];
x = 1:length(y);
plot(x, y,'r+')
x1 = 1:.1:length(y);
y1 = interp1(x, y, x1);
hold on
plot(x1, y1,'.')
sply = spline(x, y, x1)
plot(x1, sply, 'k')