Please show matlab code. Will upvote,

Do Exercise 3.14 in NCM. For part (a), save your modification of splinetx.m as splinetx_mod.m. As a consequence, for part (b) you will have to update interpgui .m so that it now uses the function splinetx mod instead of the original splinetx. A=diag(a,1)+diag(b,0)+diag(c,1) and uses backslash to compute the slopes. (b) Monitor condest (A) as the spline knots are varied with interpgui. What happens if two of the knots approach each other? Find a data set that makes condest (A) large