# Interpolation

This chapter describes functions for performing interpolation. The library provides a variety of interpolation methods, including Cubic splines and Akima splines. The interpolation types are interchangeable, allowing different methods to be used without recompiling. Interpolations can be defined for both normal and periodic boundary conditions. Additional functions are available for computing derivatives and integrals of interpolating functions.

The functions described in this section are declared in the header files ``gsl_interp.h'` and ``gsl_spline.h'`.

- Introduction to Interpolation
- Interpolation Functions
- Interpolation Types
- Index Look-up and Acceleration
- Evaluation of Interpolating Functions
- Higher-level Interface
- Interpolation Example programs
- Interpolation References and Further Reading