One-Dimensional Table Look Up, Interpolation, and Differentiation

Given a table, (xi , yi ), of independent variable values and the corresponding dependent variable values, this subroutine finds the points in the table closest to a given value of the independent variable and uses these points to interpolate for the corresponding value of the dependent variable.   Error estimates, Hermite interpolation, and the computation of derivatives are available.
This software is part of the MATH77/mathc90 collection here.

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