This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.


Inverse discrete Fourier transform




ifft(x) is the inverse discrete Fourier transform (DFT) of the Galois vector x. If x is in the Galois field GF(2m), the length of x must be 2m-1.


For an example using ifft, see the reference page for fft.


The Galois field over which this function works must have 256 or fewer elements. In other words, x must be in the Galois field GF(2m), where m is an integer between 1 and 8.


If x is a column vector, ifft applies dftmtx to the multiplicative inverse of the primitive element of the Galois field and multiplies the resulting matrix by x.

Introduced before R2006a