# interpft

## Purpose

1-D interpolation using the FFT method.

## Synopsis

    y = interpft(x,n)

## Description

`y = interpft(x,n)` returns the vector `y` that contains the value of the periodic function `x` resampled to `n` equally spaced points. If `length(x) = m`, and `x` has sample interval `dx`, then the new sample interval for `y` is

    dy = dx*n/m

Note that `n` cannot be smaller than `m`.

## Algorithm

`interpft` uses the FFT method. The original vector `x` is transformed to the Fourier domain using `fft` and then transformed back with more points.

## See Also

    interp1, interp2

(c) Copyright 1994 by The MathWorks, Inc.