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Cubic interpollation

Type : interpollation
References : Posted by Olli Niemitalo
Linked file : other001.gif

Notes :
(see linkfile)
finpos is the fractional, inpos the integer part.


Code :
xm1 = x [inpos - 1];
x0 = x [inpos + 0];
x1 = x [inpos + 1];
x2 = x [inpos + 2];
a = (3 * (x0-x1) - xm1 + x2) / 2;
b = 2*x1 + xm1 - (5*x0 + x2) / 2;
c = (x1 - xm1) / 2;
y [outpos] = (((a * finpos) + b) * finpos + c) * finpos + x0;



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