SHARE
TWEET

Untitled

a guest Apr 24th, 2019 78 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. function yi = SplineC2natural(x, y, xi)
  2.     n = length(x);
  3.     for i=1:n
  4.         a(i)=y(i);
  5.         if(i < n)
  6.             h(i)=x(i+1)-x(i);
  7.         endif
  8.     endfor
  9.    
  10.     A = zeros(n, n);
  11.    
  12.     for i=2:n-1
  13.         A(i,i-1) = h(i-1);
  14.         A(i,i) = 2*(h(i-1)+h(i));
  15.         A(i,i+1) = h(i);
  16.     endfor
  17.    
  18.     A(1,1) = 1;
  19.     A(n+1, n) = 1;
  20.    
  21.     B = zeros(n+1,1);
  22.    
  23.     for i=2:n-2
  24.         B(i)=3*(a(i+1)-a(i))/h(i) - 3*(a(i) - a(i-1))/h(i-1);
  25.     endfor
  26.    
  27.     c = A\B;
  28.    
  29.     length(c)
  30.     length(a)
  31.     length(h)
  32.    
  33.     for i=1:n-1
  34.         b(i) = (a(i+1)-a(i))/h(i) - h(i)/3*(2*c(i) + c(i+1));
  35.         d(i)=(c(i+1)-c(i))/(3*h(i));
  36.     endfor
  37.    
  38.     for i=1:n-1
  39.     if (xi >= x(i) && xi <= x(i+1))
  40.     yi =a(i)+b(i)*(xi-x(i))+c(i)*(xi-x(i))^2+d(i)*(xi-x(i))^3;
  41.     endif
  42.     endfor
RAW Paste Data
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. OK, I Understand
 
Top