copark86

function cubic_driver(num_points)
%  cubic_driver(n) computes a cubic spline
%  interpolant of the runge function
%    
%     f(x) = 1/(1+25*x^2)
%
%  based on n linearly spaced 
%  points in the interval [-1,1] 

runge = @(x) 1./(1+ 25*x.^2);