Write a MATLAB function which will compute the smoothing spline. The first line of the code should be

function s $=$ mysmspl$($y$,$lam$)$

where s is the spline vector, y is the measurement vector, and lam is the smoothing parameter. Use your trid code to do most of the work and do not create or use the M matrix. Convince me that your spline code is accurate. Please do not use M matric. Use any other method and answer should come otherwise I will give thumbs down.