spleval.m

这是在网上下的一个东东

function points = spleval(f) 
%SPLEVAL Evaluation of a spline or spline curve. 
% 
% points = spleval(f) 
% 
% Computes points on the given spline or spline curve f between 
% its extreme breaks. 
 
% Original routine fnplt by C. de Boor / latest change: Oct. 25, 1997 
% Simplified by Per Christian Hansen, IMM, 04/16/98. 
 
% Set default number of points. 
npoints = 300; 
 
if (f.form(1)=='B') f = sp2pp(f); end 
 
[breaks,coefs,l,k,d] = ppbrk(f); 
x = breaks(1) + [0:npoints]*((breaks(l+1)-breaks(1))/npoints); 
v=ppual(f,x); 
 
if (d==1), points=[x;v]; else, points = v; end