Description: Question: using cubic spline interpolation method node function value. Algorithm Description: 1. That the parameter variables (three moment equation) used to calculate the numerical second derivative S (x). The first constructor from the conditional linear expression, and then on the points to be continuity in the use of cubic spline function S (x) in the interval [] where the expression is the unknown parameters. From the first category boundaries, derived on the tridiagonal equations where =, k = 1,2, ... n-1, obtained after the substitution S (x) be function values.
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