# realifft (MathScript RT Module Function)

LabVIEW 2012 MathScript RT Module Help

Edition Date: June 2012

Part Number: 373123C-01

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Owning Class: transforms

Requires: MathScript RT Module

## Syntax

c = realifft(a)

c = realifft(a, b)

c = realifft(a, b, d)

c = realifft(a, [], d)

## Description

Computes the inverse fast Fourier transform (IFFT) where the output is known to be real. realifft computes the inverse discrete Fourier transform in the same manner as the Inverse FFT VI.

Examples

## Inputs

Name Description
a Specifies a vector or matrix.
b Controls zero-padding to the signal. b is an integer and typically is a power of 2.
d Specifies the dimension of a in which LabVIEW performs the IFFT. d is an integer.
[] Tells LabVIEW that you want to specify a and d but not b.

## Outputs

Name Description
c Returns the real inverse fast Fourier transform of a. If a is a vector, c = realifft(a) returns the original real inverse discrete Fourier transform (IDFT). If a is a matrix, c = realifft(a) returns the column-wise real IFFTs of all columns of a. c is a vector or matrix.

## Details

The following table lists the support characteristics of this function.

 Supported in the LabVIEW Run-Time Engine Yes Supported on RT targets Yes Suitable for bounded execution times on RT Not characterized

## Examples

A = [10, -2+2i, -2, -2-2i]
C = realifft(A, 8)

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