Fast fourier transform derived from the Numerical Recipes in C routine. More...

Public Types

enum  transformDirection { FORWARD_TRANSFORM = 1, REVERSE_TRANSFORM = -1 }
 

Static Public Member Functions

static void transform (complexField &field, const labelList &nn, transformDirection fftDirection)
 
static tmp< complexFieldforwardTransform (const tmp< complexField > &field, const labelList &nn)
 
static tmp< complexFieldreverseTransform (const tmp< complexField > &field, const labelList &nn)
 
static tmp< complexVectorFieldforwardTransform (const tmp< complexVectorField > &field, const labelList &nn)
 
static tmp< complexVectorFieldreverseTransform (const tmp< complexVectorField > &field, const labelList &nn)
 

Detailed Description

Fast fourier transform derived from the Numerical Recipes in C routine.

The complex transform field is returned in the field supplied. The direction of transform is supplied as an argument (1 = forward, -1 = reverse). The dimensionality and organisation of the array of values in space is supplied in the nn indexing array.

Source files

Definition at line 51 of file fft.H.

Member Enumeration Documentation

Enumerator
FORWARD_TRANSFORM 
REVERSE_TRANSFORM 

Definition at line 56 of file fft.H.

Member Function Documentation

void transform ( complexField field,
const labelList nn,
transformDirection  fftDirection 
)
static

Definition at line 42 of file fft.C.

References Foam::abort(), UList< T >::begin(), Foam::endl(), Foam::FatalError, FatalErrorIn, Foam::fftRenumber(), forAll, n, Foam::sin(), List< T >::size(), Foam::sqrt(), SWAP, and TWOPI.

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tmp< complexField > forwardTransform ( const tmp< complexField > &  field,
const labelList nn 
)
static

Definition at line 190 of file fft.C.

References tmp< T >::clear(), and Foam::transform().

Referenced by Foam::calcEk().

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tmp< complexField > reverseTransform ( const tmp< complexField > &  field,
const labelList nn 
)
static

Definition at line 206 of file fft.C.

References tmp< T >::clear(), and Foam::transform().

Referenced by noiseFFT::Pf(), and turbGen::U().

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tmp< complexVectorField > forwardTransform ( const tmp< complexVectorField > &  field,
const labelList nn 
)
static

Definition at line 222 of file fft.C.

References tmp< T >::clear(), Foam::component(), and VectorSpace< Vector< scalar >, scalar, 3 >::nComponents.

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tmp< complexVectorField > reverseTransform ( const tmp< complexVectorField > &  field,
const labelList nn 
)
static

Definition at line 251 of file fft.C.

References tmp< T >::clear(), Foam::component(), and VectorSpace< Vector< scalar >, scalar, 3 >::nComponents.

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The documentation for this class was generated from the following files:
  • src/randomProcesses/fft/fft.H
  • src/randomProcesses/fft/fft.C