Editing Trigonometric interpolation (section)

{{Short description|Interpolation with trigonometric polynomials}}
In [[mathematics]], '''trigonometric interpolation''' is [[interpolation]] with [[trigonometric polynomial]]s. Interpolation is the process of finding a function which goes through some given [[data points]]. For trigonometric interpolation, this function has to be a trigonometric polynomial, that is, a sum of [[trigonometric function|sines and cosines]] of given periods. This form is especially suited for interpolation of [[periodic function]]s.

An important special case is when the given data points are equally spaced, in which case the solution is given by the [[discrete Fourier transform]].