Introduction to Interpolation - GNU Scientific Library -- Reference Manual
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### 27.1 Introduction

Given a set of data points (x_1, y_1) \dots (x_n, y_n) the routines described in this section compute a continuous interpolating function y(x) such that y(x_i) = y_i. The interpolation is piecewise smooth, and its behavior at the end-points is determined by the type of interpolation used.

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