how do i reconstruct the analytical form of a spline I have calculated with the spap2 command, in order to have the 3 polynomials that compose the spline itself, but I don't know the formula in which to put the coefficients stored.

>>m=100;

>> x=unifrnd(0,2,m,1);

>> eps=normrnd(0,1,m,1);

>> y=cos(x)+eps;

>> sp=spap2(3,4,x,y);