EasyKrig3.0
代码说明：
Usage: yi=akimai(x,y,xi) Given vectors x and y (of the same length) and the array xi at which to interpolate, fits piecewise cubic polynomials and returns the interpolated values yi at xi. Ref. : Hiroshi Akima, Journal of the ACM, Vol. 17, No. 4, October 1970, pages 589-602. Programmer: N. Shamsundar, University of Houston, 6/2002 Correction to lines 32-33, 9/2004, motivated by Gilford Ward, to make routine work correctly for linear data. Notes: Use only for precise data, as the fitted curve passes through the given points exactly. This routine is useful for plotting a pleasingly smooth curve through a few given points for purposes of plotting.
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