Examples:

1. The following commands will interpolate the data using a spline function and plot the results.

   clear; x = [1 2.1 3.9 5.0 6.8]; %Create data
y = [1.1 5.2 5.9 2.8 5.1];
xx = 1:0.1:7;
yy = spline(x,y,xx);
plot(x,y,'o',xx,yy)


   

2. The following commands will compute the interpolated value at x=3.