For a given (n+ 1) nodes on the function value, using cubic spline approach the margin, this is a high-order interpolation methods, it has both a good convergence also relatively smooth. It is actually the third curve from the sub-linking in contact there is 2-order continuous derivative.

三次样条_ C++实现
.................\jiedian.txt
.................\print.txt
.................\三次样条_070460.cpp

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